CN113844427B - Engine torque management method based on acceleration control - Google Patents
Engine torque management method based on acceleration control Download PDFInfo
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- CN113844427B CN113844427B CN202111152029.8A CN202111152029A CN113844427B CN 113844427 B CN113844427 B CN 113844427B CN 202111152029 A CN202111152029 A CN 202111152029A CN 113844427 B CN113844427 B CN 113844427B
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- 230000001133 acceleration Effects 0.000 title claims abstract description 86
- 238000007726 management method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000009826 distribution Methods 0.000 description 6
- 238000004422 calculation algorithm Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
- B60W40/107—Longitudinal acceleration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0657—Engine torque
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mathematical Physics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an engine torque management method based on acceleration control, which is characterized by comprising the following steps of: calibrating the parameters A, B and C, and determining acceleration limit values at different vehicle speeds. And determining whether the driver has the accelerator opening critical value of the sudden acceleration intention or not according to the calibration parameters D and E, the coefficient A, the coefficient B and the coefficient C. And the ECU can judge the running state of the vehicle through the accelerator opening critical value and the accelerator duration time and select the corresponding torque limit value. Therefore, the engine torque management method based on acceleration control can accurately identify the intention of a driver, not only can meet the power requirement of the driver for driving, but also can greatly reduce the oil consumption of the whole vehicle, reduce the calibration workload and improve the calibration efficiency.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine torque management method based on acceleration control.
Background
The existing engine torque management method is to limit the torque of each gear and each rotating speed on the basis of the common torque; when the throttle opening exceeds a certain constant for a period of time, entering another torque limit value; at this time, torque output is compensated according to the deviation between the current acceleration and the normal acceleration, and the limit torque is large if the deviation is large.
The existing torque management method has the defects that errors often occur due to large calculation errors of gears, so that deviation of torque limit values affects dynamic economy; the common torque at each gear and rotating speed is not regular and circulated, and the common torque is not universal as a limit value; the torque compensation is too cumbersome to match with the driver's intention; the algorithm needs to calculate the engine rotation speed at all times and judge the gear at all times, so that the calculated amount is large and the ECU resource is occupied; the scheme has about 200 calibration parameters, the calibration workload is too large, and the efficiency is not ideal.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an engine torque management method based on acceleration control, which can accurately identify the intention of a driver, can meet the power requirement of the driver for driving, can greatly reduce the oil consumption of the whole vehicle, reduces the calibration workload and improves the calibration efficiency.
In order to achieve the above object, the present invention provides an engine torque management method based on acceleration control, comprising: calibrating the parameters A, B and C, and determining acceleration limit values at different vehicle speeds. And determining whether the driver has the accelerator opening critical value of the sudden acceleration intention or not according to the calibration parameters D and E, the coefficient A, the coefficient B and the coefficient C. And the ECU can judge the running state of the vehicle through the accelerator opening critical value and the accelerator duration time and select the corresponding torque limit value.
In one embodiment of the invention, parameters A, B and C are derived based on big data of existing vehicle operation.
In one embodiment of the invention, parameters D and E are derived based on big data of existing vehicle operation.
In one embodiment of the present invention, the coefficient a is the initial opening degree of the accelerator pedal, and has a value of 0.
In one embodiment of the present invention, the coefficient B is the opening degree of the accelerator pedal, and has a value of 80.
In one embodiment of the invention, the coefficient C is the speed of torque recovery and has a value of 200Nm/s.
In one embodiment of the invention, the duration is 1.5s.
Compared with the prior art, the engine torque management method based on acceleration control can accurately identify the intention of a driver, can meet the driving power requirement of the driver, can greatly reduce the oil consumption of the whole vehicle, does not need to distinguish models, vehicle types and operation scenes, is more universal and reasonable, and can reduce the oil consumption by 2L/100km and greatly improve the product competitiveness through verification. In addition, the algorithm is simplified, ECU resources are released, the calibration workload is reduced, and the calibration efficiency is improved.
Drawings
FIG. 1 is a flow chart diagram of an engine torque management method based on acceleration control according to an embodiment of the present invention;
FIG. 2 is a graphical illustration of the change in acceleration with time based on a certain highway truck speed in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of the acceleration versus vehicle speed distribution of a test vehicle and a market vehicle according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of the distribution of actual average and normal accelerations in accordance with an embodiment of the present invention;
fig. 5 is a schematic diagram of the relationship between acceleration and vehicle speed according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
FIG. 1 is a flow chart diagram of a method of engine torque management based on acceleration control according to an embodiment of the present invention. FIG. 2 is a graphical representation of the change in acceleration with time based on a certain highway truck speed in accordance with one embodiment of the present invention. FIG. 3 is a graph showing acceleration versus vehicle speed for a test vehicle and a market vehicle according to one embodiment of the present invention. Fig. 4 is a schematic diagram of the distribution of actual average acceleration and regular acceleration according to an embodiment of the present invention. Fig. 5 is a schematic diagram of the relationship between acceleration and vehicle speed according to an embodiment of the present invention.
As shown in fig. 1 to 5, an engine torque management method based on acceleration control according to a preferred embodiment of the present invention is characterized by comprising: calibrating the parameters A, B and C, and determining acceleration limit values at different vehicle speeds. And determining whether the driver has the accelerator opening critical value of the sudden acceleration intention or not according to the calibration parameters D and E, the coefficient A, the coefficient B and the coefficient C. And the ECU can judge the running state of the vehicle through the accelerator opening critical value and the accelerator duration time and select the corresponding torque limit value.
In one embodiment of the invention, parameters A, B and C are derived based on big data of existing vehicle operation. The parameters D and E are derived based on big data of the existing vehicle operation.
In one embodiment of the present invention, the coefficient a is the initial opening K of the accelerator pedal, and has a value of 0. The coefficient B is the opening degree of the accelerator pedal, and the value is 80.
In one embodiment of the invention, the coefficient C is the speed of torque recovery and has a value of 200Nm/s. The duration was 1.5s.
In practical application, the engine torque management method based on acceleration control mainly avoids high vehicle oil consumption caused by large acceleration due to unintentional acceleration by accurately identifying the intention of a driver, reserves a conscious rapid acceleration process, meets the power requirement of the driver, and greatly reduces the oil consumption of the whole vehicle while the power meets the driving requirement of the driver. The limitation of acceleration is realized by PID adjustment of output torque, so that torque management based on acceleration control is realized.
As shown in fig. 2, the acceleration is plotted with time based on the speed of a certain highway truck, and it can be seen that there is a particularly large acceleration locally and the duration is very short. In two cases, the driver is urgent to achieve rapid acceleration, and the unintentional behavior causes large acceleration, which is detrimental to fuel economy. The purpose of this proposal is to avoid unintentional acceleration, to keep conscious rapid acceleration process, and to control acceleration.
Through carrying out big data statistical analysis on a large number of vehicle types, the vehicle acceleration distribution is found to accord with a certain rule: that is, the average acceleration is approximately constant near 0 vehicle speed, the average acceleration is gradually reduced near 0-60 vehicle speed, and the average acceleration is approximately constant above 60 vehicle speed. Fig. 3 and 4 are distributions of acceleration with vehicle speed based on different vehicle types and different road sections.
The data processing finds that the vehicle speed is between 16 and 66 (km/h), and the regular acceleration satisfies the following formula:
a＝A-B*(v-C)；
examples:
a＝0.53-0.008*(v-15)；(v>＝16&v<＝66(km/h))
a＝0.522；v<＝16km/h
a＝0.122；v>＝66km/h
the relation diagram of acceleration and vehicle speed (shown in fig. 5) can be obtained by the formula 3, when data is marked, only three parameters A, B and C are marked, and the initial setting can be used for reference of the example.
Acceleration limitation does not mean that larger accelerations are not allowed to occur, but rather that there is a constraint. The approximate correlation coefficient of the accelerator and the vehicle speed is as follows:
K0＝D+E*v；
examples: k0 =10+0.45×v;
the second formula may be used as an initial value for the calibration. When the accelerator opening K >3 x K0 or K >80 and the duration exceeds 1.5s (takes the minimum value), the driver is regarded as conscious sudden acceleration, and when the accelerator is out of the range, the driver is regarded as exiting sudden acceleration. When the accelerator enters a sudden acceleration state from a limited acceleration state, the torque increase rate between the limited torque and the current accelerator torque is 200Nm/s; immediately after exiting from the rapid acceleration state, the torque is limited to the acceleration limiting state. Wherein, 3×k0 is the opening of the accelerator pedal of the driver, 3 can be adjusted 80 in the calibration process to be the opening of the accelerator pedal, that is, the estimated values 3×k0 and 80 are compared, the minimum value is taken, when the actual accelerator opening exceeds the minimum value, and the duration is 1.5s, so that whether the accelerator is accelerated rapidly can be judged.
When the accelerator opening is lower than the threshold value, the engine torque is output according to the accelerator control when the acceleration does not exceed the required value, and once the acceleration exceeds the required value, the acceleration is controlled. The control acceleration is realized by PID adjustment of the output torque; when the accelerator opening is higher than the critical value for 1.5s, the output torque is transited from the current value to the torque value of the accelerator at 200Nm/s, and when the accelerator opening is lower than the critical value, the output torque is instantly returned to the acceleration limiting mode.
The auxiliary control function of the invention requires calibration of the parameters A, B, C, D, E, respectively, and coefficients 3, 80 and 200 can also be used as calibrated parameters, wherein D and E are used for calculating K0.
The engine torque management method based on acceleration control has the core of accurately identifying the intention of a driver, avoiding high fuel consumption of a vehicle caused by large acceleration due to unintentional acceleration, retaining a conscious rapid acceleration process, and greatly reducing the fuel consumption of the whole vehicle while aiming at realizing that power meets the driving requirement of the driver. The control of the acceleration is realized by analyzing big data, and the distribution rule is found: that is, the average acceleration is approximately constant near 0 vehicle speed, the average acceleration is gradually reduced near 0 to 60 vehicle speeds, and the average acceleration is approximately constant above 60 vehicle speeds. Determining acceleration limit values under different vehicle speeds through calibrating parameters A, B, C; by calibrating the parameters D, E, the coefficients 3, 80 and 200, it is determined whether the driver has the accelerator opening critical value for the intention of rapid acceleration. The running state of the vehicle can be judged through the two limit values, so that a reasonable torque limit value is selected, and engine torque management based on acceleration control is realized.
In a word, the engine torque management method based on acceleration control can accurately identify the intention of a driver, not only can meet the power requirement of driving of the driver, but also can greatly reduce the oil consumption of the whole vehicle, does not need to distinguish models, vehicle types and operation scenes, is more universal and reasonable, and can reduce the oil consumption by 2L/100km and greatly improve the product competitiveness through verification. In addition, the algorithm is simplified, ECU resources are released, the calibration workload is reduced, and the calibration efficiency is improved.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (1)
1. An engine torque management method based on acceleration control, comprising:
calibrating the parameters A, B and C, and determining acceleration limit values at different vehicle speeds;
calibrating the parameters D and E, and the coefficients A, B and C to determine whether the driver has an accelerator opening critical value of the intention of rapid acceleration; and
the ECU can judge the running state of the vehicle through the accelerator opening critical value and the accelerator duration time, and select a corresponding torque limit value;
wherein the parameter A, the parameter B and the parameter C are obtained based on big data of the running of the existing vehicle;
wherein the parameter D and the parameter E are obtained based on big data of the existing vehicle operation;
wherein the coefficient A is the initial opening degree of the accelerator pedal, and the value is 0;
wherein the coefficient B is the opening degree of an accelerator pedal and has a value of 80;
wherein the coefficient C is the speed of torque recovery and has a value of 200Nm/s;
wherein the duration is 1.5s;
wherein, the average acceleration near 0 vehicle speed is approximate constant, the average acceleration near 0-60 vehicle speed is gradually reduced, and the average acceleration above 60 vehicle speed is approximate constant;
the vehicle speed is 16-66 km/h, and the regular acceleration meets the following formula:
a=A-B*(v-C)；
the approximate correlation coefficient of the accelerator and the vehicle speed is as follows: k0 =d+e×v;
wherein, the accelerator opening K is more than 3 x K0 or K is more than 80 and the duration exceeds 1.5s, the driver is regarded as conscious rapid acceleration, and the accelerator is regarded as exiting the rapid acceleration when the accelerator is out of the range;
when the accelerator enters a sudden acceleration state from a limited acceleration state, the torque increase rate between the limited torque and the current accelerator torque is 200Nm/s;
wherein, after exiting from the rapid acceleration state, the torque is immediately limited to the acceleration limiting state;
wherein 3×k0 is the opening of the accelerator pedal of the driver, the coefficient 3 can be adjusted in the calibration process, 80 is the opening of the accelerator pedal, that is, the estimated values 3×k0 and 80 are compared, the minimum value is taken, and when the actual accelerator opening exceeds the minimum value, the duration is integrated for 1.5s, so that whether the accelerator is accelerated rapidly can be determined.
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| DE102015015923A1 (en) * | 2015-12-09 | 2017-06-14 | Wabco Gmbh | Method for adaptively controlling a vehicle speed in a vehicle and cruise control system for carrying out the method |
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| CN110712648B (en) * | 2019-09-16 | 2020-12-11 | 中国第一汽车股份有限公司 | Method and device for determining driving state, vehicle and storage medium |
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