阅读说明：本技术 一种整车发动机瞬态控制方法及车辆 (Whole vehicle engine transient control method and vehicle ) 是由 王继磊 徐艳杰 陈月春 刘刚 于 2021-05-27 设计创作，主要内容包括：本发明涉及车辆技术领域,尤其涉及一种整车发动机瞬态控制方法及车辆,整车发动机瞬态控制方法包括如下步骤：S1、TCU识别驾驶员对发动机存在动力需求,控制AMT的实际挡位降低至需求挡位；S2、所述发动机的烟度限制MAP切换为降挡瞬态控制烟度限制MAP’,并控制所述发动机按照所述降挡瞬态控制烟度限制MAP’中对应所述需求挡位的烟度限制值工作,所述发动机的烟度限制MAP对烟度的限制大于所述降挡瞬态控制烟度限制MAP’对烟度的限制。本发明能够提升发动机的瞬态动力输出的响应速度,从而保证整车动力,降低油耗。(The invention relates to the technical field of vehicles, in particular to a finished automobile engine transient control method and a vehicle, wherein the finished automobile engine transient control method comprises the following steps: s1, recognizing that the driver has a power demand on the engine, and controlling the actual gear of the AMT to be reduced to a demanded gear by the TCU; s2, switching the smoke intensity limit MAP of the engine into a downshift transient control smoke intensity limit MAP ', and controlling the engine to work according to the smoke intensity limit value corresponding to the required gear in the downshift transient control smoke intensity limit MAP ', wherein the smoke intensity limit of the smoke intensity limit MAP of the engine is greater than the smoke intensity limit of the downshift transient control smoke intensity limit MAP '. The invention can improve the response speed of transient power output of the engine, thereby ensuring the power of the whole vehicle and reducing the oil consumption.)

1. A finished automobile engine transient control method is characterized by comprising the following steps:

s1, recognizing that the driver has a power demand on the engine, and controlling the actual gear of the AMT to be reduced to a demanded gear by the TCU;

s2, switching the smoke intensity limit MAP of the engine into a downshift transient control smoke intensity limit MAP ', and controlling the engine to work according to the smoke intensity limit value corresponding to the required gear in the downshift transient control smoke intensity limit MAP ', wherein the smoke intensity limit of the smoke intensity limit MAP of the engine is greater than the smoke intensity limit of the downshift transient control smoke intensity limit MAP '.

2. The vehicle engine transient control method of claim 1, wherein in step S1, when the TCU recognizes that the opening of the accelerator pedal is greater than the set threshold and the vehicle speed of the vehicle is reduced, it is determined that the driver has a power demand on the engine.

3. The finished automobile engine transient control method according to claim 2, wherein an accelerator pedal opening sensor is arranged on the accelerator pedal, the accelerator pedal opening sensor is in communication connection with the TCU, and the accelerator pedal opening sensor is used for monitoring the opening of the accelerator pedal.

4. The vehicle engine transient control method according to claim 2, wherein a speed sensor is provided on the vehicle, and the speed sensor is in communication connection with the TCU and is used for detecting the speed of the vehicle.

5. The vehicle engine transient control method of claim 1, wherein said downshift transient control smoke limit MAP' has different transient smoke limit values for different gears, and said transient smoke limit value for each gear is smaller than the smoke limit MAP of the engine for the corresponding gear.

6. The vehicle engine transient control method of claim 1, wherein said engine smoke limit MAP and said downshift transient control smoke limit MAP' pass calibration of said engine test on an engine test bench.

7. The vehicle engine transient control method of claim 1, wherein in step S1, the TCU controls the transmission structure of the AMT to perform the downshift operation by initiating a downshift command to the actuator of the AMT.

8. The vehicle engine transient control method according to claim 1, wherein it is determined whether a ratio of an output rotation speed to an input rotation speed of the AMT is within a speed ratio range of the required gear, and when the ratio is within the speed ratio range of the required gear, the AMT is determined to be lowered to the required gear.

9. The vehicle engine transient control method according to claim 8, wherein a first speed sensor is disposed at an input end of the AMT, a second speed sensor is disposed at an output end of the AMT, and both the first speed sensor and the second speed sensor are in communication connection with the TCU.

10. A vehicle, characterized in that the engine of the vehicle is controlled using the entire vehicle engine transient control method as claimed in any one of claims 1-9.

Technical Field

The invention relates to the technical field of vehicles, in particular to a finished vehicle engine transient control method and a vehicle.

Background

The demand of an AMT (automated mechanical transmission) vehicle for an engine is concentrated on the rotational speed and the torque, which occur during upshifts and downshifts. If the accelerator opening of the driver is larger, the AMT of the whole vehicle can also perform downshift operation, which indicates that the driver has strong demand for dynamic property, and the engine needs to respond to the torque demand of the controller TCU (Transmission Control Unit) of the AMT to the engine in time.

But is often limited by the transient power output capability of the engine, which is not responsive in a timely manner. Torque output is limited, typically due to an engine internal smoke limit MAP, resulting in insufficient torque development. The problem is not great when the gear is shifted up, but the problem is very prominent when the gear is shifted down in mountainous areas, if the output torque of the engine cannot follow the required torque due to the fact that the smoke intensity inside the engine limits MAP, the rotating speed of the engine can be greatly reduced in a short time due to external resistance (a mountain road slope is large), the AMT can effectively overcome the external resistance only by continuously shifting down, and the whole vehicle can continuously run. Therefore, the power of the whole vehicle is insufficient, and the oil consumption is high.

Therefore, a method for controlling the transient state of the whole vehicle engine and a vehicle are needed to solve the technical problems.

Disclosure of Invention

The invention aims to provide a finished automobile engine transient control method and an automobile, which can improve the response speed of transient power output of an engine, thereby ensuring the power of the finished automobile and reducing the oil consumption.

In order to achieve the purpose, the invention adopts the following technical scheme:

a transient control method for a whole vehicle engine comprises the following steps:

s1, recognizing that the driver has a power demand on the engine, and controlling the actual gear of the AMT to be reduced to a demanded gear by the TCU;

s2, switching the smoke intensity limit MAP of the engine into a downshift transient control smoke intensity limit MAP ', and controlling the engine to work according to the smoke intensity limit value corresponding to the required gear in the downshift transient control smoke intensity limit MAP ', wherein the smoke intensity limit of the smoke intensity limit MAP of the engine is greater than the smoke intensity limit of the downshift transient control smoke intensity limit MAP '.

Further, in step S1, when the TCU recognizes that the opening degree of the accelerator pedal is greater than the set threshold value and the vehicle speed of the entire vehicle is decreased, it is determined that the driver has a power demand on the engine.

Furthermore, an accelerator pedal opening sensor is arranged on the accelerator pedal and is in communication connection with the TCU, and the accelerator pedal opening sensor is used for monitoring the opening of the accelerator pedal.

Furthermore, a speed sensor is arranged on the whole vehicle and is in communication connection with the TCU for detecting the speed of the whole vehicle.

Furthermore, different transient smoke limit values are arranged in the downshift transient control smoke limit MAP' corresponding to different gears, and the transient smoke limit value corresponding to each gear is smaller than the limit value in the smoke limit MAP of the engine corresponding to the gear.

Further, the smoke limit MAP of the engine and the downshift transient control smoke limit MAP' pass calibration of the engine test on an engine test bench.

Further, in step S1, the TCU controls the transmission structure of the AMT to perform a downshift operation by sending a downshift command to the actuator of the AMT.

And further, judging whether the ratio of the output rotating speed to the input rotating speed of the AMT is in the speed ratio range of the demand gear, and determining that the AMT is reduced to the demand gear when the AMT is in the speed ratio range of the demand gear.

Further, the input end of the AMT is provided with a first rotating speed sensor, the output end of the AMT is provided with a second rotating speed sensor, and the first rotating speed sensor and the second rotating speed sensor are both in communication connection with the TCU.

A vehicle uses the whole vehicle engine transient control method to control the engine of the vehicle.

The invention has the beneficial effects that:

according to the transient control method for the whole vehicle engine, the TCU recognizes the power requirement of a driver on the engine, controls the actual gear of the AMT to be reduced to the required gear, then switches the smoke intensity limit MAP of the engine to the downshift transient smoke intensity limit MAP ', and the smoke intensity limit of the downshift transient smoke intensity limit MAP' is smaller than the smoke intensity limit of the smoke intensity limit MAP, so that the power performance of the engine during operation under the working condition is improved, the response speed of transient power output of the engine is increased, the power of the whole vehicle is ensured, and the oil consumption is reduced.

According to the vehicle provided by the invention, the engine is controlled by adopting the whole vehicle engine transient control method, and the response speed of the transient power output of the engine can be increased, so that the whole vehicle power is ensured, and the oil consumption is reduced.

Drawings

FIG. 1 is a flow chart of a vehicle engine transient control method of the present invention.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In order to increase the response speed of the transient power output of the engine, thereby ensuring the power of the whole vehicle and reducing the oil consumption, the invention provides a transient control method of the whole vehicle engine as shown in fig. 1. The transient control method of the whole vehicle engine comprises the following steps:

s1, recognizing that the driver has a power demand on the engine, and controlling the actual gear of the AMT to be reduced to a demanded gear by the TCU;

s2, switching the smoke intensity limiting MAP of the engine into the downshift transient control smoke intensity limiting MAP ', controlling the engine to work according to the smoke intensity limiting value of the corresponding required gear in the downshift transient control smoke intensity limiting MAP ', wherein the smoke intensity limiting value of the smoke intensity limiting MAP of the engine is larger than the smoke intensity limiting value of the downshift transient control smoke intensity limiting MAP '.

After a TCU identifies that a driver has a power demand on an engine, the TCU sends a downshift instruction, meanwhile, the TCU immediately sends a torque clearing instruction to an engine ECU (electronic control unit), the torque of the engine is reduced to 0 according to the reduction slope required by the TCU, in order to enable the rotation speed of an AMT input shaft to be synchronous with the rotation speed of the engine, a speed regulating instruction (torque demand and engine oil injection are needed) needs to be sent to the engine in a speed regulating stage, after the rotation speed of the engine is synchronous with the rotation speed of the input shaft, a torque returning stage is started, the TCU can send a certain reduction torque slope to the ECU, but the transient power output capability of the engine is limited, the engine cannot follow the required slope, most of the internal smoke limit MAP of the engine causes torque output limitation, and the torque exertion is insufficient. The problem is very outstanding when the gear is shifted down in a heavy mountain area, if the output torque of the engine cannot follow the torque required by the TCU due to the smoke intensity limitation of the engine, the rotating speed of the engine can be greatly reduced in a short time due to external resistance (a mountain road slope is large), so that the external resistance can be effectively overcome only by continuously shifting down the AMT, and the whole vehicle continues to run.

Therefore, the TCU recognizes that the driver has power demand on the engine, controls the actual gear of the AMT to be reduced to the demanded gear, then switches the smoke intensity limiting MAP of the engine to the downshift transient smoke intensity limiting MAP ', and improves the dynamic property of the engine during operation under the working condition and the response speed of transient power output of the engine because the limit of the downshift transient smoke intensity limiting MAP' on the smoke intensity is smaller than the limit of the smoke intensity limiting MAP on the smoke intensity, thereby ensuring the power of the whole vehicle and reducing the oil consumption.

Further, in step S1, when the TCU recognizes that the opening degree of the accelerator pedal is greater than the set threshold value and the vehicle speed of the entire vehicle is decreased, it is determined that the driver has a power demand for the engine. When a driver has a power demand on the engine, the accelerator can be stepped down in a large range, and when the accelerator is larger than a set threshold value and the vehicle speed is reduced, the power demand on the engine by the driver is proved to be large, and the gear at the moment can not meet the power demand, so that the gear reduction operation is required.

Furthermore, an accelerator pedal opening sensor is arranged on the accelerator pedal and is in communication connection with the TCU, and the accelerator pedal opening sensor is used for monitoring the opening of the accelerator pedal. The TCU can conveniently and timely obtain the opening degree of the accelerator by arranging the accelerator opening degree sensor, so that the power demand of a driver on the engine is accurately judged, and the accuracy of controlling the AMT is improved.

Furthermore, a speed sensor is arranged on the whole vehicle and is in communication connection with the TCU for detecting the speed of the whole vehicle. Through setting up speed sensor, can judge the speed change of whole car to the TCU of being convenient for controls AMT.

Furthermore, different transient smoke limit values are arranged in the downshift transient control smoke limit MAP' corresponding to different gears, and the transient smoke limit value corresponding to each gear is smaller than the limit value in the smoke limit MAP of the engine corresponding to the gear. Different transient smoke limit values are set corresponding to different gears, so that the control of the engine is more flexible and accurate, the accurate control is realized for different gears, the response speed of transient power output of the engine is improved, and meanwhile, the oil consumption of the whole vehicle and the damage to a DPF (wall-flow type particle trap) are reduced.

Further, the smoke limit MAP and the downshift transient control smoke limit MAP' of the engine are calibrated on an engine test bench through engine tests. Through the mode, the smoke intensity limit MAP and the downshift transient control smoke intensity limit MAP' of the engine can truly reflect the treatment requirement of exhaust emission of the engine in actual work. After the downshift transient control smoke limit MAP 'is calibrated, actual tests can be carried out in mountainous areas according to actual needs, and the value of the downshift transient control smoke limit MAP' is adjusted according to test conditions.

Further, in step S1, the TCU controls the transmission structure of the AMT to perform a downshift operation by initiating a downshift command to the actuator of the AMT. Specifically, the TCU automatically controls gear selection, gear shifting and clutch of gears through a gear selection and shifting mechanism and a clutch control mechanism to realize gear lifting operation.

Further, whether the ratio of the output rotating speed to the input rotating speed of the AMT is in the speed ratio range of the required gear is judged, and when the ratio is in the speed ratio range of the required gear, the AMT is determined to be reduced to the required gear. Through the above judging mode, the AMT can be judged according to the actual output rotating speed ratio of the AMT, and the AMT is ensured to be reduced to the required gear, so that the engine is ensured to work under the required gear, and the response speed of transient power output of the transmitter is ensured.

Specifically, the input of AMT is provided with first tachometric sensor, and the output of AMT is provided with second tachometric sensor, and first tachometric sensor and second tachometric sensor all are connected with the TCU communication. The rotating speed of the AMT output end and the rotating speed of the output end are accurately acquired by the first rotating speed sensor and the second rotating speed sensor, so that the accuracy of the rotating speed ratio obtained by the TCU is guaranteed, and the gear is guaranteed to be lowered to the required gear.

The embodiment also provides a vehicle, and the engine of the vehicle is controlled by using the whole vehicle engine transient control method, so that the response speed of the transient power output of the engine can be increased, the whole vehicle power is ensured, and the oil consumption is reduced.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.