阅读说明：本技术 主动格栅低温下缩短暖车过程的节油量计算及测试方法 (Fuel saving amount calculation and test method for shortening warming process of active grille at low temperature ) 是由 钱国刚 杨正军 李菁元 窦艳涛 吴迪 秦宏宇 高海洋 陈强 吕赫 任美林 凌健 于 2021-06-30 设计创作，主要内容包括：本发明提供了一种主动格栅低温下缩短暖车过程的节油量计算及测试方法,以低温时汽油车受益于主动格栅技术削减冷却气流效果而产生的燃油消耗量节约数额可以得到测量计算,通过主动格栅低温下缩短暖车过程的节油量计算及测试方法有助于帮助车企改进车辆的设计,使产品在社会实际应用中更节约燃油,有助于促动车企在更多车型上推广主动格栅技术,达成节油减碳。(The invention provides a fuel saving amount calculation and test method for shortening a vehicle warming process at low temperature by an active grille, which can measure and calculate the fuel consumption saving amount generated by the gasoline vehicle benefiting from the cooling air flow effect reduced by the active grille technology at low temperature, and the fuel saving amount calculation and test method for shortening the vehicle warming process at low temperature by the active grille is helpful for helping vehicle enterprises to improve the design of vehicles, so that the products can save more fuel in social practical application, is helpful for promoting the vehicle enterprises to popularize the active grille technology on more vehicle types, and achieves the purposes of saving fuel and reducing carbon.)

1. The fuel saving amount calculating and testing method for shortening the vehicle warming process of the active grille at low temperature is characterized by comprising the following steps of: the specific calculation steps of the fuel saving amount comprise:

s1, deriving a fuel saving calculation formula, establishing a fuel consumption rate-time coordinate system, and testing the ambient temperature T at a constant speed in the vehicle warming process_CoolantDrawing a first curve of the change of the oil consumption rate with time of the active grid in an ON state and a second curve of the change of the oil consumption rate with time of the active grid in an OFF state within the time of the rising to T after the hot car finishes, and obtaining an oil saving amount calculation formula through the first curve and the second curve;

s2, obtaining relevant data needed by the fuel-saving calculation formula of the detected vehicle, including the cooling liquid temperature T of the active grille under the on state_coolantTime T of rising to T_{T_on}Off state cooling liquid temperature T_coolantTime T of rising to T_{T_off}T in Off state_{T_on}Oil consumption rate q at every moment_{tX_off}T in the On state_{T_on}Oil consumption rate at all times

S3, mixingAnd t_{T_off}，Andand the oil saving amount is obtained by being taken into an oil saving amount calculation formula.

2. The fuel saving amount calculation and test method for shortening the vehicle warming process at low temperature by using the active grille according to claim 1, characterized in that: the specific method for deducing the oil saving amount calculation formula comprises the following steps:

s101, establishing a rectangular coordinate system, wherein the horizontal axis represents time, and the vertical axis represents oil consumption rate;

s102, warming the carMeasured ambient temperature T_CoolantEnd of climb to T by the hot car, wherein T is defined_{T_on}For active grille cooling liquid temperature T under on state_coolantThe time when T is climbed to is defined_{T_off}The temperature T of the coolant in the off state_coolantRising to T moment, q is the oil consumption rate under the constant test vehicle speed V, the q value is decreased gradually along with the time under the on state and the off state and is more rapidly decreased under the on state, and the definitionTo be in Off state t_{T_on}Oil consumption at the moment, definitionIs t in the On state_{T_on}The oil consumption rate at that moment;

s103, drawing a first fuel consumption rate time-varying curve in a grid ON state and a second fuel consumption rate time-varying curve in a grid OFF state, driving at a constant test vehicle speed V, enabling the slopes of the first curve and the second curve to be approximately constant, and marking a time t in a rectangular coordinate system_{T_on}And t_{T_off}Define t in On state_{T_on}Oil consumption rate at all timesFor point N, define t in the Off state_{T_on}Oil consumption rate at all timesDefining a point K of the oil consumption rate at the initial test time as a point M, defining the oil consumption rate at the end of the test of the grating in an off state as a point L, connecting KN and NL to draw a curve I, and connecting KL to draw a curve II, wherein the oil consumption rates of the point L and the point N are the same;

the definition parameter n represents the triangle area S_ΔKNLAnd the area S of the triangle_ΔMLNThe fuel injection rate q is substantially equal, the triangular area S_ΔMLNCorresponding to a part of the total fuel saving amount isArea S of triangle_ΔKNLCorresponding to the fuel saving amount of the whole process, the delta KNL consists of delta MLN and delta MNK, and the area is calculated by taking MN as the baseNamely, it is

S104, an oil saving amount calculation formula:

3. the fuel saving amount calculation and test method for shortening the vehicle warming process at low temperature by using the active grille according to claim 2, characterized in that: in step S2, the specific step of obtaining the relevant data required by the fuel saving amount calculation formula includes:

s201, cooling the vehicle to a test environment temperature, wherein the test environment temperature is a low temperature below zero;

s202, starting the vehicle at low temperature;

s203, uniformly accelerating to a speed V within 5S;

s204, recording tail gas data and cooling liquid temperature under the condition of driving at a constant speed V, obtaining a change curve of the automobile cooling liquid temperature along with time through the recorded cooling liquid temperature, and obtaining specific moments of an ON state and an OFF state of an active grille state when the temperature is T, wherein the specific moments are T_{T_off}When the temperature changes to T in the grid OFF state, T_{T_on}The moment when the temperature changes to T when the grating is in an ON state;

andbased on a carbon balance method, the method is obtained by analyzing tail gas data.

4. The fuel saving amount calculation and test method for shortening the vehicle warming process at low temperature by using the active grille according to claim 3, characterized in that: in step S2, the temperature of the cooling liquid is recorded by a temperature testing data acquisition device, so that a time-dependent change curve of the temperature of the cooling liquid of the automobile is obtained, and t is obtained_{T_off}And t_{T_on}The temperature testing data acquisition equipment adopts a PT100 thermocouple type multichannel transmitting instrument with a voltage value output function;

andand analyzing and obtaining the test result by adopting a chassis dynamometer rotary drum test bed test system of the CVS tail gas analyzer.

5. The fuel saving amount calculation and test method for shortening the vehicle warming process at low temperature by using the active grille according to claim 4, characterized in that: the data flow of the temperature testing data acquisition equipment and the parameters of a chassis dynamometer rotary drum test bed testing system equipped with a CVS tail gas analyzer are synchronously acquired, and the time axes are aligned.

6. The fuel saving amount calculation and test method for shortening the vehicle warming process at low temperature by using the active grille according to claim 3, characterized in that: the test environment temperature is below-seven degrees.

7. The fuel saving amount calculation and test method for shortening the vehicle warming process at low temperature by using the active grille according to claim 3, characterized in that: the constant test vehicle speed V of the light passenger vehicle is 31 km/h.

Technical Field

The invention belongs to the field of oil consumption rate calculation, and particularly relates to an oil saving amount calculation and test method for shortening a vehicle warming process at a low temperature by using an active grille.

Background

As shown in fig. 1, the oil consumption rate is higher when the automobile is started by heating, and gradually stabilizes when the automobile finishes constant-speed driving, and as shown in fig. 2, when the temperature of the heated automobile rises to 70 degrees under a general condition, the time required for detecting the opening state and the closing state of the grille is about 516 seconds, so that the detection of the opening state and the closing state of the grille has important significance for shortening the process of warming the automobile and reducing the evaluation of the oil consumption rate, and the optimization of the starting state of the grille and the fuel saving of the automobile enterprise.

Disclosure of Invention

In view of the above, the present invention is directed to a method for calculating and testing fuel saving amount of an active grille during a warming process at a low temperature, so as to solve the problem that the influence of two states of the active grille opening and closing on fuel saving rate is not quantitatively evaluated during the warming process.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the fuel saving amount calculating and testing method for shortening the vehicle warming process of the active grille at low temperature comprises the following specific calculating steps:

s1, deriving a fuel saving calculation formula, establishing a fuel consumption rate-time coordinate system, and testing the ambient temperature T at a constant speed in the vehicle warming process_CoolantDrawing a first curve of the change of the oil consumption rate with time of the active grid in an ON state and a second curve of the change of the oil consumption rate with time of the active grid in an OFF state within the time of the rising to T after the hot car finishes, and obtaining an oil saving amount calculation formula through the first curve and the second curve;

s2, obtaining relevant data needed by the fuel-saving calculation formula of the detected vehicle, including the cooling liquid temperature T of the active grille under the on state_coolantTime T of rising to T_{T_on}Off state cooling liquid temperature T_coolantTime T of rising to T_{T_off}T in Off state_{T_on}Oil consumption rate at all timesAt On state t_{T_on}Oil consumption rate at all times

S3, mixing t_{T_on}And t_{T_off}，Andand the oil saving amount is obtained by being taken into an oil saving amount calculation formula.

Further, a specific method for deducing the fuel saving amount calculation formula is as follows:

s101, establishing a rectangular coordinate system, wherein the horizontal axis represents time, and the vertical axis represents oil consumption rate;

s102, testing the environmental temperature T in the vehicle warming process_CoolantEnd of climb to T by the hot car, wherein T is defined_{T_on}For active grille cooling liquid temperature T under on state_coolantThe time when T is climbed to is defined_{T_off}The temperature T of the coolant in the off state_coolantRising to T, q being constantTesting the oil consumption rate at the vehicle speed V, wherein the q value decreases gradually along with the time in the on state and the off state and decreases more rapidly in the on state, and is definedTo be in Off state t_{T_on}Oil consumption at the moment, definitionIs t in the On state_{T_on}The oil consumption rate at that moment;

s103, drawing a first fuel consumption rate time-varying curve in a grid ON state and a second fuel consumption rate time-varying curve in a grid OFF state, driving at a constant test vehicle speed V, enabling the slopes of the first curve and the second curve to be approximately constant, and marking a time t in a rectangular coordinate system_{T_on}And t_{T_off}Define t in On state_{T_on}Oil consumption rate at all timesFor point N, define t in the Off state_{T_on}Oil consumption rate at all timesDefining a point K of the oil consumption rate at the initial test time as a point M, defining the oil consumption rate at the end of the test of the grating in an off state as a point L, connecting KN and NL to draw a curve I, and connecting KL to draw a curve II, wherein the oil consumption rates of the point L and the point N are the same;

the definition parameter n represents the triangle area S_ΔKNLAnd the area S of the triangle_ΔMLNThe fuel injection rate q is substantially equal, the triangular area S_ΔMLNCorresponding to a part of the total fuel saving amount isArea S of triangle_ΔKNLCorresponding to the fuel saving amount of the whole process, the delta KNL consists of delta MLN and delta MNK, and the area is calculated by taking MN as the baseNamely, it is

S104, an oil saving amount calculation formula:

further, in step S2, the step of obtaining the relevant data required by the fuel saving amount calculation formula includes:

s201, cooling the vehicle to a test environment temperature, wherein the test environment temperature is a low temperature below zero;

s202, starting the vehicle at low temperature;

s203, uniformly accelerating to a speed V within 5S;

s204, recording tail gas data and cooling liquid temperature under the condition of driving at a constant speed V, obtaining a change curve of the automobile cooling liquid temperature along with time through the recorded cooling liquid temperature, and obtaining specific moments of an ON state and an OFF state of an active grille state when the temperature is T, wherein the specific moments are T_{T_off}When the temperature changes to T in the grid OFF state, T_{T_on}The moment when the temperature changes to T when the grating is in an ON state;

andbased on a carbon balance method, the method is obtained by analyzing tail gas data.

Further, in step S2, the coolant temperature is recorded by a temperature measuring data acquisition device, so as to obtain a time-dependent change curve of the coolant temperature of the vehicle, and further obtain t_{T_off}And t_{T_on}The temperature testing data acquisition equipment adopts a PT100 thermocouple type multichannel transmitting instrument with a voltage value output function;

required for obtaining fuel-saving quantity calculation formulaAndand analyzing and obtaining the test result by adopting a chassis dynamometer rotary drum test bed test system of the CVS tail gas analyzer.

Furthermore, the data flow of the temperature testing data acquisition equipment and the parameters of a chassis dynamometer rotary drum test bed testing system equipped with a CVS tail gas analyzer are synchronously acquired, and the time axes are aligned.

Further, the test environment temperature is below-seven degrees.

Further, the constant test vehicle speed V of the light passenger vehicle is 31 km/h.

Compared with the prior art, the method for calculating and testing the fuel saving amount of the active grille in the process of shortening the warming process at low temperature has the following beneficial effects:

(1) the gasoline vehicle at low temperature benefits from the effect of reducing cooling air flow by the active grille technology, so that the saved amount of fuel consumption can be measured and calculated, the test result is favorable for helping the vehicle enterprise to improve the design of the vehicle, the product is more fuel-saving in social practical application, the active grille technology is favorable for promoting the vehicle enterprise to popularize on more vehicle types, and the purposes of saving oil and reducing carbon are achieved.

(2) The active grille of the invention shortens the influence of the control of the fuel-saving calculation quantitative calculation grille on the fuel consumption rate in the vehicle warming process at low temperature, helps the vehicle to improve the design of the vehicle, and leads the product to save more fuel, save energy and protect the environment in the social practical application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of coolant temperature, transient fuel consumption rate and engine speed at a cold start idle speed of a vehicle at a low temperature according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a first half of a vehicle running at a cold start at low temperature according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a calculation formula of the oil consumption rate according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 3, the fuel saving amount calculating and testing method for shortening the vehicle warming process at low temperature by the active grille specifically comprises the following steps:

s1, deriving a fuel saving calculation formula, establishing a fuel consumption rate-time coordinate system, and testing the ambient temperature T at a constant speed in the vehicle warming process_CoolantDrawing a first curve of the change of the oil consumption rate with time of the active grid in an ON state and a second curve of the change of the oil consumption rate with time of the active grid in an OFF state within the time of the rising to T after the hot car finishes, and obtaining an oil saving amount calculation formula through the first curve and the second curve;

s2, obtaining relevant data needed by the fuel-saving calculation formula of the detected vehicle, including the cooling liquid temperature T of the active grille under the on state_coolantTime T of rising to T_{T_on}Off state cooling liquid temperature T_coolantTime T of rising to T_{T_off}T in Off state_{T_on}Oil consumption rate at all timesAt On state t_{T_on}Oil consumption rate at all times

S3, mixing t_{T_on}And t_{T_off}，Andand the oil saving amount is obtained by being taken into an oil saving amount calculation formula.

The working state of the movable grating is divided into an ON state and an OFF state, the ON state is the state of the grating under normal working, the OFF state is the state that the opening degree of the active grating reaches full opening, and the oil saving amount is obtained by comparing the two states.

The T is generally 70 ℃.

As shown in fig. 3, the specific method for deriving the fuel saving calculation formula is as follows:

s101, establishing a rectangular coordinate system, wherein the horizontal axis represents time, and the vertical axis represents oil consumption rate;

s102, testing the environmental temperature T in the vehicle warming process_CoolantEnd of climb to T by the hot car, wherein T is defined_{T_on}For active grille cooling liquid temperature T under on state_coolantThe time when T is climbed to is defined_{T_off}The temperature T of the coolant in the off state_coolantRising to T moment, q is the oil consumption rate under the constant test vehicle speed V, the q value is decreased gradually along with the time under the on state and the off state and is more rapidly decreased under the on state, and the definitionTo be in Off state t_{T_on}Oil consumption at the moment, definitionIs t in the On state_{T_on}The oil consumption rate at that moment;

s103, drawing a first fuel consumption rate time-varying curve in a grid ON state and a second fuel consumption rate time-varying curve in a grid OFF state, driving at a constant test vehicle speed V, enabling the slopes of the first curve and the second curve to be approximately constant, and marking a time t in a rectangular coordinate system_{T_on}And t_{T_off}Define t in On state_{T_on}Oil consumption rate at all timesFor point N, define t in the Off state_{T_on}Oil consumption rate at all timesDefining a point K of the oil consumption rate at the initial test time as a point M, defining the oil consumption rate at the end of the test of the grating in an off state as a point L, connecting KN and NL to draw a curve I, and connecting KL to draw a curve II, wherein the oil consumption rates of the point L and the point N are the same;

the definition parameter n represents the triangle area S_ΔKNLAnd the area S of the triangle_ΔMLNThe fuel injection rate q is substantially equal, the triangular area S_ΔMLNCorresponding to a part of the total fuel saving amount isArea S of triangle_ΔKNLCorresponding to the fuel saving amount of the whole process, the delta KNL consists of delta MLN and delta MNK, and the area is calculated by taking MN as the baseNamely, it is

S104, an oil saving amount calculation formula:

as shown in fig. 3, in step S2, the specific step of obtaining the relevant data required by the fuel saving amount calculation formula includes:

s201, cooling the vehicle to a test environment temperature, wherein the test environment temperature is a low temperature below zero;

s202, starting the vehicle at low temperature;

s203, uniformly accelerating to a speed V within 5S;

s204, recording tail gas data and cooling liquid temperature under the condition of driving at a constant speed V, obtaining a change curve of the automobile cooling liquid temperature along with time through the recorded cooling liquid temperature, and obtaining specific moments of an ON state and an OFF state of an active grille state when the temperature is T, wherein the specific moments are T_{T_off}When the temperature changes to T in the grid OFF state, T_{T_on}The moment when the temperature changes to T when the grating is in an ON state;

andbased on a carbon balance method, the method is obtained by analyzing tail gas data.

As shown in fig. 3, in step S2, the coolant temperature is recorded by a temperature test data acquisition device, thereby obtainingThe temperature of the automobile coolant changes along with the time curve, and then t is obtained_{T_off}And t_{T_on}The temperature testing data acquisition equipment adopts a PT100 thermocouple type multichannel transmitting instrument with a voltage value output function;

required for obtaining fuel-saving quantity calculation formulaAndand analyzing and obtaining the test result by adopting a chassis dynamometer rotary drum test bed test system of the CVS tail gas analyzer.

The chassis dynamometer rotary drum test bed test system of the CVS tail gas analyzer is in the prior art.

The temperature testing data acquisition equipment is in the prior art, and can adopt an HVAC test System type environment simulation data acquisition System of DEWSOFT company.

Referring to fig. 3, the data stream of the temperature measurement data acquisition device is acquired synchronously with the parameters of the chassis dynamometer rotary drum test bed test system equipped with the CVS tail gas analyzer, with the time axes aligned.

As shown in fig. 3, the test environment temperature is minus seven degrees.

As shown in FIG. 3, the constant test vehicle speed V of the light passenger vehicle is 31 km/h.

For section 1 of the running condition of Chinese automobiles: according to the light automobile, the vehicle speed value is averaged to obtain 30.88km/h under the condition that the vehicle speed is not 0 in the low and medium speed segments in the CLTC _ P of the light automobile, so that the vehicle speed V value of the method is 31km/h, the condition that the vehicle speed is 0 is eliminated in the application because the theoretical wind speed is 0, and the heating process is basically not influenced by the existence or absence of grids in principle.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.