阅读说明：本技术 一种热机怠速的设定方法及装置 (Method and device for setting idling of heat engine ) 是由 傅军亮 尉爽 于 2019-09-24 设计创作，主要内容包括：本申请公开了一种热机怠速的设定方法及装置,该方法包括：首先计算出目标热机的初始怠速转速矩阵列,然后根据该初始怠速转速矩阵列,获取到目标热机的初始转速扭矩矩阵,并进一步获取到目标热机的燃烧热性,接着,根据获取到的初始怠速转速矩阵列、转速扭矩矩阵以及燃烧特性,模拟出目标热机的动力总成的振动数据以及整车零件的振动数据,最后,可以根据模拟出的目标热机的动力总成的振动数据和整车零件的振动数据,设定出目标热机的怠速转速值。可见,本申请在设定目标热机的怠速转速值时,考虑了目标热机的动力总成的振动数据以及整车零件的振动数据,从而可以避免所设定的怠速值失效,提高了怠速设定结果的合理性以及整车开发的效率。(The application discloses a method and a device for setting idling of a heat engine, wherein the method comprises the following steps: the method comprises the steps of firstly calculating an initial idle speed matrix array of a target heat engine, then obtaining an initial speed torque matrix of the target heat engine according to the initial idle speed matrix array, further obtaining combustion heat of the target heat engine, then simulating vibration data of a power assembly of the target heat engine and vibration data of parts of a whole vehicle according to the obtained initial idle speed matrix array, the obtained speed torque matrix and the obtained combustion characteristics, and finally setting an idle speed value of the target heat engine according to the simulated vibration data of the power assembly of the target heat engine and the simulated vibration data of the parts of the whole vehicle. Therefore, when the idling speed value of the target heat engine is set, the vibration data of the power assembly of the target heat engine and the vibration data of parts of the whole vehicle are considered, so that the set idling value can be prevented from being invalid, and the reasonability of the idling setting result and the development efficiency of the whole vehicle are improved.)

1. A method of setting an idle speed of a heat engine, comprising:

calculating an initial idle speed matrix array of the target heat engine;

acquiring an initial rotating speed and torque matrix of the target heat engine according to the initial idle rotating speed matrix array of the target heat engine;

acquiring the combustion characteristic of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine;

simulating vibration data of a power assembly of the target heat engine and vibration data of parts of the whole vehicle according to the initial idle speed matrix array, the rotating speed torque matrix and the combustion characteristic of the target heat engine;

and setting an idle speed value of the target heat engine according to the vibration data of the power assembly of the target heat engine and the vibration data of the parts of the whole vehicle.

2. The method of claim 1, wherein the combustion characteristics of the target heat engine include idle stability, speed fluctuations, on-load idle fuel consumption, cylinder pressure curve, and torque reserve state of the target heat engine.

3. The method of claim 2, wherein the obtaining the combustion characteristic of the target heat engine from an initial idle speed matrix column and an initial speed torque matrix of the target heat engine comprises:

testing the idle speed stability and the rotating speed fluctuation value of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine;

calculating an idling oil consumption with load and a cylinder pressure curve under each initial idling speed value according to the initial idling speed matrix array and the initial rotating speed torque matrix of the target heat engine;

and testing the torque reservation state under each initial idle speed value according to the initial idle speed matrix array and the initial speed torque matrix of the target heat engine.

4. The method of claim 1, wherein simulating vibration data of a powertrain of the target heat engine and vibration data of a vehicle component based on an initial idle speed matrix array, a speed torque matrix, and combustion characteristics of the target heat engine comprises:

performing idle speed response excitation analysis on the target heat engine by using a power assembly CAE according to an initial idle speed matrix array, a speed and torque matrix and combustion characteristics of the target heat engine, and evaluating a six-degree-of-freedom excitation calculation result of the power assembly, a rigid body mode calculation result of the power assembly and vibration acceleration of a suspension active and passive end;

and carrying out vehicle NVH calculation on the target vehicle by utilizing a power assembly CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine to obtain vibration data of vehicle parts.

5. The method of claim 1, wherein after setting the idle speed value of the target heat engine according to the vibration data of the powertrain of the target heat engine and the vibration data of the vehicle component, further comprising:

verifying the idle speed value of the target heat engine to obtain a verification result;

and determining a final idle speed value of the target heat engine according to the verification result.

6. A setting device for an idle speed of a heat engine, comprising:

the calculation unit is used for calculating an initial idle speed matrix array of the target heat engine;

the first acquisition unit is used for acquiring an initial rotating speed and torque matrix of the target heat engine according to the initial idle rotating speed matrix array of the target heat engine;

the second acquisition unit is used for acquiring the combustion characteristics of the target heat engine according to the initial idle speed matrix array and the initial speed and torque matrix of the target heat engine;

the simulation unit is used for simulating vibration data of a power assembly of the target heat engine and vibration data of finished automobile parts according to an initial idle speed matrix array, a rotating speed torque matrix and combustion characteristics of the target heat engine;

and the setting unit is used for setting the idle speed value of the target heat engine according to the vibration data of the power assembly of the target heat engine and the vibration data of the whole vehicle parts.

7. The apparatus of claim 6, wherein the combustion characteristics of the target heat engine include idle stability, speed fluctuations, on-load idle fuel consumption, cylinder pressure curve, and torque reserve state of the target heat engine.

8. The apparatus of claim 7, wherein the second obtaining unit comprises:

the first testing subunit is used for testing the idle speed stability and the rotating speed fluctuation value of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine;

the first calculating subunit is used for calculating an idling oil consumption with load and a cylinder pressure curve under each initial idling speed value according to the initial idling speed matrix array and the initial rotating speed torque matrix of the target heat engine;

and the second testing subunit is used for testing the torque reservation state under each initial idle speed value according to the initial idle speed matrix array and the initial speed and torque matrix of the target heat engine.

9. The apparatus of claim 6, wherein the analog unit comprises:

the analysis subunit is used for carrying out idle speed response excitation analysis on the target heat engine by utilizing the CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine, and evaluating a six-degree-of-freedom excitation calculation result of the power assembly, a rigid body modal calculation result of the power assembly and the vibration acceleration of the suspension main passive end;

and the second calculating subunit is used for performing whole vehicle NVH calculation on the target vehicle by using the power assembly CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine to obtain vibration data of parts of the whole vehicle.

10. The apparatus of claim 6, further comprising:

the verification unit is used for verifying the idle speed value of the target heat engine to obtain a verification result;

and the determining unit is used for determining the final idle speed value of the target heat engine according to the verification result.

Technical Field

The application relates to the technical field of engines, in particular to a method and a device for setting idling of a heat engine.

Background

The idling state is an operating state when an engine is idling, in actual life, the idling of the engine is too low, so that a vehicle is flamed out when the vehicle is temporarily stopped, and if the idling of the engine is too high, the consumption of fuel is increased, the operating temperature of the engine is increased, the abrasion of the engine is accelerated, and the vehicle is damaged.

At present, for the setting mode of the idling of the heat engine of the whole vehicle, usually, the idling values of similar vehicle types are referred to first, then, a plurality of groups of idling speed values are selected at the early stage of the development of the whole vehicle by combining with the oil consumption target, and then, the plurality of groups of idling speed values are used for verifying the plurality of groups of idling speed values of the real vehicle. However, in this idle setting method, the influence of the idle value on Noise, Vibration, and Harshness (NVH) of the vehicle parts (because the vehicle parts still only have conceptual data states at this time) cannot be considered. The key finished automobile parts comprise a suspension, an automobile body, a steering wheel, a seat guide rail, a suspension and the like, the modes of the inherent properties of the parts are likely to resonate with the preset idle speed value, so that the set idle speed value fails. In addition, because the idle value of the heat engine greatly affects the calibration of the whole vehicle, the magnitude of the idle value is directly related to the setting of acceleration, deceleration, throttle opening and ignition angle of the vehicle in the driving process, if the idle value set in the early stage is invalid, the calibration work related to the idle speed also needs to be restarted, and further the development time node of the whole vehicle is possibly affected.

Therefore, how to effectively set the idling value of the heat engine by using a more advanced method to avoid the failure of the set idling value caused by the resonance generated by the parts of the whole vehicle and the engine, thereby improving the development efficiency of the whole vehicle becomes a problem to be solved urgently.

Disclosure of Invention

The main purpose of the embodiments of the present application is to provide a method and an apparatus for setting an idle speed of a heat engine, which can consider whether a whole vehicle part and an engine generate resonance or not in a setting process, thereby avoiding a failure of a set idle speed value and improving the efficiency of whole vehicle development.

In a first aspect of the present application, a method for setting an idle speed of a heat engine is provided, including:

calculating an initial idle speed matrix array of the target heat engine;

acquiring an initial rotating speed and torque matrix of the target heat engine according to the initial idle rotating speed matrix array of the target heat engine;

acquiring the combustion characteristic of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine;

simulating vibration data of a power assembly of the target heat engine and vibration data of parts of the whole vehicle according to the initial idle speed matrix array, the rotating speed torque matrix and the combustion characteristic of the target heat engine;

and setting an idle speed value of the target heat engine according to the vibration data of the power assembly of the target heat engine and the vibration data of the parts of the whole vehicle.

In an alternative implementation, the combustion characteristics of the target heat engine include idle stability, speed fluctuation, on-load idle fuel consumption, cylinder pressure curve, and torque reserve state of the target heat engine.

In an alternative implementation, the obtaining the combustion characteristics of the target heat engine according to the initial idle speed matrix column and the initial speed torque matrix of the target heat engine includes:

testing the idle speed stability and the rotating speed fluctuation value of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine;

calculating an idling oil consumption with load and a cylinder pressure curve under each initial idling speed value according to the initial idling speed matrix array and the initial rotating speed torque matrix of the target heat engine;

and testing the torque reservation state under each initial idle speed value according to the initial idle speed matrix array and the initial speed torque matrix of the target heat engine.

In an optional implementation manner, the simulating vibration data of a powertrain of the target heat engine and vibration data of a finished vehicle part according to an initial idle speed matrix column, a speed and torque matrix and a combustion characteristic of the target heat engine includes:

performing idle speed response excitation analysis on the target heat engine by using a power assembly CAE according to an initial idle speed matrix array, a speed and torque matrix and combustion characteristics of the target heat engine, and evaluating a six-degree-of-freedom excitation calculation result of the power assembly, a rigid body mode calculation result of the power assembly and vibration acceleration of a suspension active and passive end;

and carrying out vehicle NVH calculation on the target vehicle by utilizing a power assembly CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine to obtain vibration data of vehicle parts.

In an optional implementation manner, after setting an idle speed value of the target heat engine according to the vibration data of the power assembly of the target heat engine and the vibration data of the vehicle parts, the method further includes:

verifying the idle speed value of the target heat engine to obtain a verification result;

and determining a final idle speed value of the target heat engine according to the verification result.

Corresponding to the method for setting the idling speed of the heat engine, the application provides a device for setting the idling speed of the heat engine, which comprises the following steps:

the calculation unit is used for calculating an initial idle speed matrix array of the target heat engine;

the first acquisition unit is used for acquiring an initial rotating speed and torque matrix of the target heat engine according to the initial idle rotating speed matrix array of the target heat engine;

the second acquisition unit is used for acquiring the combustion characteristics of the target heat engine according to the initial idle speed matrix array and the initial speed and torque matrix of the target heat engine;

the simulation unit is used for simulating vibration data of a power assembly of the target heat engine and vibration data of finished automobile parts according to an initial idle speed matrix array, a rotating speed torque matrix and combustion characteristics of the target heat engine;

and the setting unit is used for setting the idle speed value of the target heat engine according to the vibration data of the power assembly of the target heat engine and the vibration data of the whole vehicle parts.

In an alternative implementation, the combustion characteristics of the target heat engine include idle stability, speed fluctuation, on-load idle fuel consumption, cylinder pressure curve, and torque reserve state of the target heat engine.

In an optional implementation manner, the second obtaining unit includes:

the first testing subunit is used for testing the idle speed stability and the rotating speed fluctuation value of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine;

the first calculating subunit is used for calculating an idling oil consumption with load and a cylinder pressure curve under each initial idling speed value according to the initial idling speed matrix array and the initial rotating speed torque matrix of the target heat engine;

and the second testing subunit is used for testing the torque reservation state under each initial idle speed value according to the initial idle speed matrix array and the initial speed and torque matrix of the target heat engine.

In an alternative implementation, the analog unit includes:

the analysis subunit is used for carrying out idle speed response excitation analysis on the target heat engine by utilizing the CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine, and evaluating a six-degree-of-freedom excitation calculation result of the power assembly, a rigid body modal calculation result of the power assembly and the vibration acceleration of the suspension main passive end;

and the second calculating subunit is used for performing whole vehicle NVH calculation on the target vehicle by using the power assembly CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine to obtain vibration data of parts of the whole vehicle.

In an optional implementation, the apparatus further includes:

the verification unit is used for verifying the idle speed value of the target heat engine to obtain a verification result;

and the determining unit is used for determining the final idle speed value of the target heat engine according to the verification result.

Therefore, the embodiment of the application has the following beneficial effects:

the embodiment of the application provides a method and a device for setting the idling speed of a heat engine, firstly, an initial idling speed matrix array of a target heat engine is calculated, then an initial speed and torque matrix of the target heat engine is obtained according to the initial idling speed matrix array, the combustion heat of the target heat engine is obtained according to the initial idling speed matrix array and the initial speed and torque matrix, then, vibration data of a power assembly of the target heat engine and vibration data of parts of a whole vehicle can be simulated according to the obtained initial idling speed matrix array, the obtained speed and torque matrix and the obtained combustion characteristics, and finally, an idling speed value of the target heat engine can be set according to the simulated vibration data of the power assembly of the target heat engine and the simulated vibration data of the parts of the whole vehicle. Therefore, when the idling speed value of the target heat engine is set, vibration data of a power assembly of the target heat engine and vibration data of parts of the whole vehicle are considered, so that the situation that the set idling speed value is invalid can be avoided, and the reasonability of the idling setting result and the development efficiency of the whole vehicle are improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a flow chart of a method for setting idle speed of a heat engine according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a summary of a target vehicle idle load provided by an embodiment of the present application;

FIG. 3 is a graph illustrating the test results of target heat engine speed fluctuations provided by an embodiment of the present application;

fig. 4 is one of the test results of the load-on-idle fuel consumption and combustion stability of the target heat engine provided in the embodiment of the present application;

fig. 5 is a second schematic diagram of a test result of loaded idle fuel consumption and combustion stability of a target heat engine according to an embodiment of the present application;

FIG. 6 is a schematic diagram illustrating test results of a target heat engine torque reservation provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of a VTS target provided by an embodiment of the present application;

fig. 8 is a schematic diagram of a vehicle frequency MAP provided in the embodiment of the present application;

FIG. 9 is a schematic diagram of an idle speed value of a target heat engine set according to vibration data of a powertrain of the target heat engine and vibration data of parts of a finished vehicle according to an embodiment of the present application;

FIG. 10 is a flowchart illustrating a method for setting idle speed of a heat engine according to an embodiment of the present disclosure;

fig. 11 is a schematic diagram of an idle speed setting device for a heat engine according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In actual life, the idling speed of the engine has a great influence on the normal operation of the vehicle, specifically, if the idling speed of the engine is too low, the vehicle may stall when temporarily stopping, and if the idling speed of the engine is too high, the fuel consumption is increased, so that the working temperature of the engine is increased, the abrasion of the engine is accelerated, and the vehicle is damaged.

However, in the existing setting mode of the heat engine idling of the whole vehicle, usually, the idling values of similar vehicle types are referred to first, then, the fuel consumption target is combined, multiple groups of idling speed values are selected at the early stage of development of the whole vehicle, and then, the multiple groups of idling speed values are used for verifying the multiple groups of idling speed values of the real vehicle. The idle speed setting mode does not consider the influence of the idle speed on NVH of finished automobile parts such as a suspension, an automobile body, a steering wheel, a seat guide rail, a suspension and the like, and the modes of the inherent properties of the parts are likely to resonate with the preset idle speed value of a heat engine, so that the set idle speed value is invalid. In addition, because the idle value of the heat engine greatly affects the calibration of the whole vehicle, the magnitude of the idle value is directly related to the setting of acceleration, deceleration, throttle opening and ignition angle of the vehicle in the driving process, if the idle value set in the early stage is invalid, the calibration work related to the idle speed also needs to be restarted, and further the development time node of the whole vehicle is possibly affected.

Based on the method and the device, whether the whole vehicle parts and the engine resonate or not can be considered in the setting process, so that the failure of the set idle speed value is avoided, and the development efficiency of the whole vehicle is improved.

The method for setting the idling speed of the heat engine provided by the embodiment of the application is described in detail below with reference to the accompanying drawings.

Referring to fig. 1, which shows a flowchart of an embodiment of a method for setting an idle speed of a heat engine according to an embodiment of the present application, the embodiment may include the following steps:

s101: and calculating an initial idle speed matrix array of the target heat engine.

In the present embodiment, a heat engine that needs to be subjected to idle speed value setting is defined as a target heat engine, and a vehicle developed based on the target heat engine is defined as a target vehicle. In practical application, in order to accurately set an idle value of a target heat engine, firstly, an initial idle speed matrix array of the target heat engine needs to be calculated according to a target vehicle idle oil consumption target and a vehicle type of the target heat engine, and a target vehicle idle speed load is counted, as shown in fig. 2, wherein AC OFF and AC ON respectively represent ON and OFF states of a vehicle-mounted air conditioner, and an ignition angle range provided according to vehicle calibration is as follows: -5-10 CA BTDC, rail voltage is performed on the basis of 100 bar.

S102: and acquiring an initial rotating speed and torque matrix of the target heat engine according to the initial idle rotating speed matrix array of the target heat engine.

In this embodiment, after the initial idle rotation speed matrix array of the target heat engine is calculated in step S101, the torques required by the functional blocks at the respective initial idle rotation speeds of the target heat engine may be further calculated in a lump to form the initial rotation speed torque matrix of the target heat engine.

S103: and acquiring the combustion characteristics of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine.

In this embodiment, after the initial idle speed matrix array of the target heat engine is calculated in step S101, and the initial speed torque matrix of the target heat engine is obtained in step S102, the combustion characteristic of the target heat engine may be further obtained according to the initial idle speed matrix array and the initial speed torque matrix of the target heat engine.

Wherein the combustion characteristics of the target heat engine comprise idle stability, rotation speed fluctuation, loaded idle oil consumption, cylinder pressure curve and torque reservation state of the target heat engine

Based on this, in a possible implementation manner of the embodiment, the specific implementation process of the step S103 "obtaining the combustion characteristic of the target heat engine according to the initial idle speed matrix column and the initial speed torque matrix of the target heat engine" may include the following steps a 1-A3:

step A1: and testing the idle speed stability and the rotating speed fluctuation value of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine.

In the implementation mode, after the initial idle speed matrix array, the whole vehicle idle load and the initial speed torque matrix of the target heat engine are calculated, idle stability and speed fluctuation values under each initial idle speed and load can be tested on an engine bench.

For example, the following steps are carried out: as shown in fig. 3, which shows the rotation speed fluctuation values of different engine orders under different loads and ignition angles, wherein the engine orders are divided into 0.5 order, 1 order, 1.5 order and 2 order, the reasonable idle rotation speed value of the target heat engine under different torques can be obtained from fig. 3, for example, the reasonable idle rotation speed value comprehensively tested is 700rpm under four orders of 0.5 order, 1 order, 1.5 order and 2 order for the torque of 8 Nm.

Step A2: and calculating the idling oil consumption with load and a cylinder pressure curve under each initial idling speed value according to the initial idling speed matrix array and the initial rotating speed torque matrix of the target heat engine.

In this implementation manner, after the initial idle rotation speed matrix array, the entire vehicle idle load, and the initial rotation speed torque matrix of the target heat engine are calculated, the loaded idle oil consumption and the cylinder pressure curve under each initial idle rotation speed value can be calculated on the engine bench.

For example, the following steps are carried out: as shown in fig. 4 and 5, the fuel quantity ignition angle takes into account the fuel consumption at idle with load, and the COV ignition angle takes into account the engine combustion stability. For the AC OFF condition, 750rpm is a reasonable idle speed value from the viewpoint of engine order, 650rpm, 700rpm and 750rpm are reasonable idle speed values from the viewpoint of loaded idle fuel Consumption (COV), and if the two are combined, the idle speed value with 750rpm being reasonable can be obtained.

Step A3: and testing the torque reservation state under each initial idle speed value according to the initial idle speed matrix array and the initial speed torque matrix of the target heat engine.

In this implementation manner, after the initial idle speed matrix array, the entire vehicle idle load, and the initial speed torque matrix of the target heat engine are calculated, the reserved torque states at the initial idle speed values may be tested on an engine bench, as shown in fig. 6.

It should be noted that the execution sequence of step a1, step a2, and step A3 is not limited in this embodiment.

S104: and simulating vibration data of a power assembly of the target heat engine and vibration data of parts of the whole vehicle according to the initial idle speed matrix array, the rotating speed torque matrix and the combustion characteristic of the target heat engine.

In this embodiment, after the initial idle speed matrix array of the target heat engine is calculated in step S101, the initial speed torque matrix of the target heat engine is obtained in step S102, and the combustion characteristic of the target heat engine is obtained in step S103, the vibration data of the powertrain of the target heat engine and the vibration data of the vehicle parts may be further simulated according to the obtained data, and the specific implementation process may include the following steps B1-B2:

step B1: and performing idle speed response excitation analysis on the target heat engine by using the CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine, and evaluating a six-degree-of-freedom excitation calculation result of the power assembly, a rigid body mode calculation result of the power assembly and the vibration acceleration of the suspension active and passive ends.

In this embodiment, the idle response excitation analysis may be performed on the target heat engine by using the engine mount and the powertrain cae (computer architecture engine) to obtain the six-degree-of-freedom excitation result of the powertrain, the calculation result of the rigid body mode of the powertrain, the vibration acceleration of the suspension active/passive end, and the like, that is, the vibration data of the powertrain may be simulated by using the engine mount data, and the obtained data may be compared with the target vibration data of the powertrain in the Vehicle Technical Specification (VTS) of the target vehicle shown in fig. 7 to determine the rationality of the analysis result.

Step B2: and carrying out vehicle NVH calculation on the target vehicle by utilizing the power assembly CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine to obtain vibration data of vehicle parts.

In this embodiment, the engine mount may be used to calculate the NVH of the whole vehicle of the target vehicle to which the target heat engine belongs by using the powertrain CAE, so as to obtain the vibration data of the steering wheel, the vibration data of the seat, the noise data of the idle vehicle interior structure, the feasibility of mode separation, the howling level of the generator, the noise data of the intake and exhaust Air, the Heating Ventilation and Air Conditioning (HVAC) condition, and the like, that is, the vibration data of other parts of the whole vehicle may be simulated by using the engine mount data, and the obtained data may be compared with the vibration frequency (MAP) data of the whole vehicle of the target vehicle shown in fig. 8, so as to determine the rationality of the analysis result.

S105: and setting an idle speed value of the target heat engine according to the vibration data of the power assembly of the target heat engine and the vibration data of the whole vehicle parts.

In this implementation, after the vibration data of the power assembly of the target heat engine and the vibration data of the parts of the whole vehicle are simulated in step S104, the acquired combustion characteristics of the target heat engine, the design and the model selection of the part system and the like can be combined according to the simulated data, and after the whole vehicle idle speed NVH, the whole vehicle idle oil consumption and the combustion stability of the target heat engine of the target vehicle are balanced, a proper idle speed value of the target heat engine is set.

For example, the following steps are carried out: as shown in fig. 9, three recommended schemes of the idle speed value in fig. 9, namely, scheme 1, scheme 2, and scheme 3, can be obtained through the above steps, and after comprehensively considering the target vehicle idle speed NVH, the entire vehicle idle oil consumption, and the target heat engine combustion stability, scheme 1 (i.e., the scheme shown in the block of fig. 9) can be selected.

Therefore, under the condition that the influence of the idle value on each system and parts is considered and analyzed, the set idle value can avoid the failure of the set idle value caused by the resonance of the target heat engine and the mode of the finished automobile parts (suspension, automobile body, steering wheel, seat guide rail and suspension), and the risk of repeated operation of calibration work related to the idle value is reduced, and the development efficiency of the finished automobile is improved.

Further, an optional implementation manner is that after the idle speed value of the target heat engine is set according to the vibration data of the power assembly of the target heat engine and the vibration data of the whole vehicle parts, the following steps C1-C2 are further included:

step C1: and verifying the idle speed value of the target heat engine to obtain a verification result.

In this implementation, after the idle speed value of the target heat engine is set in step S105, the set idle speed value may be verified according to the execution procedures of steps S101 to S104, and a verification result is obtained, specifically, vibration data of the powertrain and vibration data of the components of the entire vehicle obtained according to the idle speed value of the target heat engine may be compared with the VTS target and the entire vehicle frequency MAP shown in fig. 7 and 8, and it may be determined whether the obtained vibration data of the powertrain and the vibration data of the components of the entire vehicle conform to the vibration data of the powertrain and the vibration data range of the components of the entire vehicle when the target vehicle normally operates, so as to obtain the verification result.

Step C2: and determining a final idle speed value of the target heat engine according to the verification result.

After the verification result of the idle speed value of the target heat engine is obtained in the step S C1, the final idle speed value of the target heat engine can be determined according to the verification result, specifically, if it is determined that the obtained vibration data of the powertrain and the vibration data of the parts of the whole vehicle are in accordance with the vibration data of the powertrain and the vibration data range of the parts of the whole vehicle when the target vehicle normally runs, it is determined that the set idle speed value of the target heat engine is reasonable and can be used as the final idle speed value of the target heat engine; if the obtained vibration data of the power assembly and the vibration data of the whole vehicle parts are judged to be not in accordance with the vibration data of the power assembly and the vibration data range of the whole vehicle parts when the target vehicle normally runs, the set idle speed value of the target heat engine is unreasonable and cannot be used as the final idle speed value of the target heat engine.

To sum up, according to the method for setting the idle speed of the heat engine provided by the embodiment of the present application, an initial idle speed rotation speed matrix column of a target heat engine is first calculated, then an initial rotation speed torque matrix of the target heat engine is obtained according to the initial idle speed rotation speed matrix column, a combustion heat property of the target heat engine is obtained according to the initial idle speed rotation speed matrix column and the initial rotation speed torque matrix, then vibration data of a power assembly of the target heat engine and vibration data of parts of a whole vehicle are simulated according to the obtained initial idle speed rotation speed matrix column, rotation speed torque matrix and combustion characteristics, and finally, an idle speed value of the target heat engine is set according to the simulated vibration data of the power assembly of the target heat engine and the simulated vibration data of the parts of the whole vehicle. Therefore, when the idling speed value of the target heat engine is set, the vibration data of the power assembly of the target heat engine and the vibration data of the parts of the whole vehicle are considered, so that the situation that the set idling speed value is invalid can be avoided, and the reasonability of the idling setting result and the development efficiency of the whole vehicle are improved.

For ease of understanding, reference is now made to fig. 10, which is a general flow chart of a method for setting the idle speed of a heat engine. The implementation process of the method for setting the idling speed of the heat engine provided by the embodiment of the application is introduced.

As shown in fig. 10, the implementation process of the embodiment of the present application is as follows: firstly, calculating an initial idle speed matrix array and a corresponding load of a target heat engine according to a target vehicle idle speed oil consumption target and a vehicle type, then obtaining a combustion pressure measured value of each cylinder, setting combustion stability and an NVH angle on the premise of meeting the oil consumption target, recommending an idle speed and a corresponding ignition angle, then performing crankshaft dynamics calculation, 16-degree-of-freedom dynamics calculation, suspension active and passive side response calculation and vehicle NVH calculation by using CAE (computer aided engineering) to simulate vibration data of a power assembly of the target heat engine and vibration data of parts of a whole vehicle, evaluating the data to set an idle speed value of the target heat engine according to an evaluation result, further, verifying the set idle speed value of the target heat engine by repeating the above processes to determine a final idle speed value of the target heat engine according to a verification result, the specific implementation process is shown in step S101 to step S105.

The above embodiments describe the technical solutions of the method of the present application in detail, and accordingly, the present application further provides a device for setting the idle speed of the heat engine, which is described below.

Referring to fig. 11, fig. 11 is a structural diagram of a device for setting an idle speed of a heat engine according to an embodiment of the present application, and as shown in fig. 11, the device includes:

a calculation unit 1101 for calculating an initial idle rotation speed matrix array of the target heat engine;

a first obtaining unit 1102, configured to obtain an initial rotation speed and torque matrix of the target heat engine according to an initial idle rotation speed matrix column of the target heat engine;

a second obtaining unit 1103, configured to obtain a combustion characteristic of the target heat engine according to an initial idle speed matrix column and an initial speed torque matrix of the target heat engine;

the simulation unit 1104 is used for simulating vibration data of a power assembly of the target heat engine and vibration data of a finished automobile part according to an initial idle speed matrix array, a speed and torque matrix and combustion characteristics of the target heat engine;

and the setting unit 1105 is used for setting the idle speed value of the target heat engine according to the vibration data of the power assembly of the target heat engine and the vibration data of the whole vehicle parts.

In some possible implementations of the present disclosure, the combustion characteristic of the target heat engine includes idle stability, speed fluctuation, on-load idle fuel consumption, cylinder pressure curve, and torque reserve state of the target heat engine.

In some possible implementations of the present application, the second obtaining unit 1103 includes:

the first testing subunit is used for testing the idle speed stability and the rotating speed fluctuation value of the target heat engine according to the initial idle speed matrix array and the initial rotating speed torque matrix of the target heat engine;

the first calculating subunit is used for calculating an idling oil consumption with load and a cylinder pressure curve under each initial idling speed value according to the initial idling speed matrix array and the initial rotating speed torque matrix of the target heat engine;

and the second testing subunit is used for testing the torque reservation state under each initial idle speed value according to the initial idle speed matrix array and the initial speed and torque matrix of the target heat engine.

In some possible implementations of the present application, the simulation unit 1104 includes:

the analysis subunit is used for carrying out idle speed response excitation analysis on the target heat engine by utilizing the CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine, and evaluating a six-degree-of-freedom excitation calculation result of the power assembly, a rigid body modal calculation result of the power assembly and the vibration acceleration of the suspension main passive end;

and the second calculating subunit is used for performing whole vehicle NVH calculation on the target vehicle by using the power assembly CAE according to the initial idle speed matrix array, the speed and torque matrix and the combustion characteristic of the target heat engine to obtain vibration data of parts of the whole vehicle.

In some possible implementations of the present application, the apparatus further includes:

the verification unit is used for verifying the idle speed value of the target heat engine to obtain a verification result;

and the determining unit is used for determining the final idle speed value of the target heat engine according to the verification result.

According to the setting device for the idling of the heat engine, firstly, an initial idling speed matrix array of the target heat engine is calculated, then, an initial speed and torque matrix of the target heat engine is obtained according to the initial idling speed matrix array, the combustion heat of the target heat engine is obtained according to the initial idling speed matrix array and the initial speed and torque matrix, then, vibration data of a power assembly of the target heat engine and vibration data of parts of the whole vehicle can be simulated according to the obtained initial idling speed matrix array, the obtained speed and torque matrix and the obtained combustion characteristics, and finally, an idling speed value of the target heat engine can be set according to the simulated vibration data of the power assembly of the target heat engine and the simulated vibration data of the parts of the whole vehicle. Therefore, when the idling speed value of the target heat engine is set, vibration data of a power assembly of the target heat engine and vibration data of parts of the whole vehicle are considered, so that the situation that the set idling speed value is invalid can be avoided, and the reasonability of the idling setting result and the development efficiency of the whole vehicle are improved.

As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.