CN113756973B - Self-adaptive control method for minimum torque of automobile engine - Google Patents
Self-adaptive control method for minimum torque of automobile engine Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
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Abstract
The invention provides a self-adaptive control method for minimum torque of an automobile engine, which comprises the following steps: reading a stored minimum self-adaptive torque reference value of the engine; judging whether the torque self-adaptive state release condition is met, if yes, executing the step S3, and if no, continuing to execute the step S2, and selecting a torque self-adaptive calculation mode according to the running state of the vehicle; generating a torque adaptive calculation result by combining the vehicle state information according to the selected torque adaptive calculation mode; according to the torque self-adaptive calculation result and the engine minimum self-adaptive torque reference value, calculating to obtain the latest engine minimum self-adaptive torque and controlling the engine; and calculating and storing the minimum self-adaptive torque reference value of the engine according to all the generated torque self-adaptive calculation results. The invention gives consideration to the self-adaption of the torque of the accessories.
Description
Technical Field
The invention belongs to the technical field of engine control, and particularly relates to a minimum torque self-adaptive control method of an automobile engine.
Background
At present, the main technical scheme is that the PID closed-loop control of the engine speed deviation is carried out through the target idling or the target rotating speed, and then the engine rotating speed is stable through the torque control, but the problems that the engine speed control adjustment time is long or unstable can be caused due to the manufacturing consistency difference and the different wearing conditions of the vehicle under different use environments and the different accessories when the engine is operated.
In the prior art, in the mode of regulating and controlling through the target rotating speed difference, under the conditions of great engine manufacturing difference, abrasion and accessory working condition difference, great difference exists in the minimum output torque required by the stable operation of the engine, the fuel consumption is high in the adjustment of the idling speed or the rotating speed of the engine, the rotating speed regulating time is long, even the problem of rotating speed fluctuation exists, and the using feeling of an actual vehicle is influenced. Meanwhile, the idle state is not carefully decomposed in the prior art, such as the conditions of temperature rise, DPF regeneration, and the like of DOCs according to different combustion modes, and along with the matching of AMT, the rotation speed needs to consider the torque in the stationary state of the blocked vehicle, and the state is related to the whole vehicle transmission system.
The invention CN 109763906 is an engine idle torque self-adaptive control method, the core technology is to control an idle torque filtering value, and the idle torque self-adaptive filtering value is controlled by controlling the condition of a self-adaptive window; however, friction work, accessory work and whole vehicle gear resistance work have very wide torque variation range under different idling or combustion modes, the rotating speed state of the engine needs to be classified, otherwise, the self-adaptive filter value is judged to be abnormal for a long time, and the self-adaptive meaning is lost.
Disclosure of Invention
The invention aims to solve the defects in the background art, and provides a minimum torque self-adaptive control method for an automobile engine, which is used for respectively calculating torque filtering values through selection of different torque self-adaptive models to finish calculation and storage of self-adaptive torque of the engine and also taking into account self-adaptation of accessory torque.
The technical scheme adopted by the invention is as follows: a minimum torque self-adaptive control method of an automobile engine comprises the following steps:
s1, after the engine control unit is powered on, initializing, reading the NVV value of the stored minimum self-adaptive torque reference value of the engine, and initializing the NVV value to a torque calculation path of the engine;
s2, acquiring vehicle state information after the engine is started normally, judging whether a torque self-adaptive state release condition is met, if yes, executing step S3, if not, continuing to execute step S2,
s3, selecting a torque self-adaptive calculation mode according to the running state of the vehicle;
s4, generating a torque self-adaptive calculation result according to the selected torque self-adaptive calculation mode and combining vehicle state information;
s5, calculating and obtaining the latest minimum self-adaptive torque of the engine according to the torque self-adaptive calculation result and the minimum self-adaptive torque reference value of the engine on the torque calculation path of the engine, and controlling the engine;
s6, outputting a torque self-adaptive calculation result to a torque calculation path of the engine to serve as a new minimum self-adaptive torque reference value of the engine;
s7, when the whole vehicle runs normally, the steps S2-S6 are executed circularly until the whole vehicle stops running, and then the step S8 is executed;
and S8, calculating and storing the minimum self-adaptive torque reference value of the engine according to all the generated torque self-adaptive calculation results.
In the above technical solution, in step S2, whether the release condition of the torque adaptive state is satisfied is determined according to the engine running mode, the engine temperature, the engine speed, the combustion mode, other control adjustments, the engine speed and the torque state. Other control and regulation are mainly the control of electric control accessories, such as an air conditioner compressor, an electric control water pump, an electric control air compressor and the like.
In the above technical solution, in the step S3, a torque adaptive calculation method is selected according to the speed and gear of the vehicle.
In the above technical solution, the torque adaptive calculation mode includes a normal idle mode; and when the vehicle speed is zero and the engine is in an idle state, adopting a normal idle mode, wherein the normal idle mode is used for calculating and obtaining the self-adaptive torque of the engine.
In the above technical solution, the torque adaptive calculation mode includes an engine accessory mode; an engine accessory mode is employed when the vehicle is coasting and the engine is idling, the engine accessory mode calculating an engine accessory torque.
In the above technical solution, the torque adaptive calculation mode includes an in-gear torque adaptive mode, where the in-gear torque adaptive mode is used for a vehicle adopting AMT, and when the vehicle adopting AMT is in gear and the whole vehicle is in a stationary state, the in-gear torque adaptive mode is used for calculating and obtaining the engine adaptive torque.
In the above technical solution, in the step S4, when the torque adaptive calculation mode selects the normal idle mode, a control filter coefficient of the engine adaptive torque is calculated according to the vehicle state information; and calculating the engine loss torque according to the calculated control filter coefficient of the engine self-adaptive torque, and taking the calculated engine loss torque as a torque self-adaptive calculation result.
In the above technical solution, in the step S4, when the engine accessory mode is selected in the torque adaptive calculation mode, the engine electronic control accessory is required to be temporarily disconnected, and the control filter coefficient of the engine accessory torque is calculated according to different accessory working states; and calculating the engine accessory torque according to the control filter coefficient of the calculated engine accessory torque, and taking the calculated engine accessory torque as a torque self-adaptive calculation result.
In the above technical solution, in the step S4, when the torque adaptive calculation mode selects the gear torque adaptive mode, a control filter coefficient of the engine adaptive torque is calculated according to the vehicle state information; and calculating the self-adaptive torque of the engine according to the control filter coefficient of the self-adaptive torque of the engine, and taking the self-adaptive torque of the engine as a self-adaptive torque calculation result.
In the above technical solution, the engine minimum adaptive torque reference value includes an engine adaptive torque reference value and an engine accessory torque reference value;
when executing the step S6, if the step S4 in the current cycle adopts the engine accessory mode, namely, the generated torque self-adaptive calculation result of the step S4 is adopted as a new engine accessory torque reference value for the next cycle calculation; if the step S4 in the current cycle adopts a normal idle mode or an in-gear torque self-adaption mode, namely, a torque self-adaption calculation result generated by the step S4 is adopted as a new engine self-adaption torque reference value for calculation of the next cycle;
when executing step S5, when the torque self-adaptive calculation mode adopts a normal idle mode or a gear torque self-adaptive mode, adopting a new engine accessory torque reference value as an engine minimum self-adaptive torque reference value to calculate the engine minimum self-adaptive torque; when the torque self-adaption calculation mode adopts an engine accessory mode, adopting a new engine self-adaption torque reference value as an engine minimum self-adaption torque reference value to calculate the engine minimum self-adaption torque;
in step S8, calculating an average value of all the torque adaptive calculation results obtained by calculating in the engine accessory mode when the step S4 is executed in a cyclic manner, and storing the NVV value of the average value as an engine accessory torque reference value; and (4) calculating the average value of all torque adaptive calculation results obtained by adopting the normal idle mode and the gear torque adaptive mode when the step (S4) is circularly executed, and storing the NVV value of the average value as an engine adaptive torque reference value. Wherein the NVV (non-volatile variable) value is defined as a non-volatile variable.
The beneficial effects of the invention are as follows: the invention judges whether the torque self-adaptive state release condition is met or not according to the vehicle state in real time, so that the torque self-adaptive calculation can be more in accordance with the actual demand, and the waste of calculation resources is avoided. According to the invention, according to the vehicle speed, the gear and the slope state, different torque self-adaptive models are selected, and the calculation of the torque filtering values is respectively carried out, so that the calculation result of the self-adaptive torque can better meet the current requirements of the vehicle state. According to the invention, after the calculation of the self-adaptive torque of the engine is completed, the storage and iterative learning are carried out, and the last calculation result adopting other modes is continuously used in the calculation process of cycling each mode, so that the self-adaptive result obtained by the current calculation is effectively ensured to consider the running state of the whole vehicle, and the self-adaptation of the accessory torque is effectively considered.
Drawings
FIG. 1 is a block diagram of the overall control flow of the control method of the present invention
FIG. 2 is a general policy block diagram of the present invention;
FIG. 3 is a strategic block diagram of the minimum torque adaptive release condition of the present invention.
FIG. 4 is a block diagram of a torque adaptive mode control flow scheme of the present invention
FIG. 5 is a block diagram of an adaptive engine accessory control strategy in the engine accessory mode of the present invention.
FIG. 6 is a strategic block diagram of the adaptive torque calculation in either the normal idle mode or the gear torque adaptation mode of the present invention.
FIG. 7 is a strategic block diagram of the minimum adaptive torque output of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples. The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The invention provides a minimum torque self-adaptive control system of an automobile engine, which comprises a torque self-adaptive state release condition judging module, a torque self-adaptive torque mode selecting module, a self-adaptive torque calculating module, an engine minimum self-adaptive torque calculating module and an engine minimum self-adaptive torque storage module. The torque self-adaptive state release condition judging module is used for judging whether to perform torque self-adaptive calculation according to the vehicle state information, and if so, sending a starting command to the torque self-adaptive torque mode selecting module. And after receiving the starting command, the torque self-adaptive torque mode selection module selects different modes according to the states of the vehicle speed, the gear and the ramp, and sends a selection result to the self-adaptive torque calculation module. And the self-adaptive torque calculation module calls a corresponding calculation mode according to the received selection result, executes a calculation program and sends the calculation result to the engine minimum self-adaptive torque calculation module and the engine minimum self-adaptive torque storage module. The engine minimum self-adaptive torque calculation module calls the reference value stored by the engine minimum self-adaptive torque storage module and the calculation result sent by the self-adaptive torque calculation module to generate the engine minimum self-adaptive torque, the engine minimum self-adaptive torque is output to the control strategy main torque path, and finally the actuator is controlled to complete closed-loop control of the engine rotating speed. The engine minimum self-adaptive torque storage module generates a new reference value according to the calculation result sent by the self-adaptive torque calculation module.
As shown in fig. 1, the invention provides a minimum torque self-adaptive control method of an automobile engine, which comprises the following steps:
s1, a vehicle key is changed from an OFF gear to an ACC gear, power supply of an engine control unit is completed, the engine control unit is initialized after being electrified, and a stored minimum self-adaptive torque reference value of the engine is read and initialized to a torque calculation path of the engine;
s2, acquiring vehicle state information after the engine is normally started, judging the engine state, such as an engine running mode, an engine temperature, an engine rotating speed, a combustion mode and other control and regulation, judging whether a torque self-adaptive state release condition is met or not through the engine rotating speed and the torque state, if yes, executing step S3, and if no, continuing to execute step S2;
s3, selecting a torque self-adaptive calculation mode according to the running state of the vehicle; the torque self-adaptive torque mode is used for selecting different modes according to the states of the vehicle speed, the gear and the ramp;
the torque adaptive torque modes are divided into: normal idle mode, in gear torque adaptive mode, engine accessory mode.
S4, generating a torque self-adaptive calculation result according to the selected torque self-adaptive calculation mode and combining vehicle state information;
after the torque self-adaptive state is sent to the self-adaptive torque calculation module, the self-adaptive torque calculation module selects a corresponding calculation mode according to the vehicle state information.
When the engine is in the normal idle mode, the engine is used for calculating the self-adaptive torque of the engine in the idle state of the engine; when the torque self-adaption calculation mode selects the normal idle mode, calculating a control filter coefficient of the engine self-adaption torque according to the vehicle state information; and calculating the engine loss torque according to the calculated control filter coefficient of the engine self-adaptive torque, and taking the calculated engine loss torque as a torque self-adaptive calculation result.
When the self-adaptive torque mode of the whole vehicle is selected, the self-adaptive torque mode is only used for calculating the AMT whole vehicle, the whole vehicle is in gear and the whole vehicle is in a static state, and the rotating speed of the engine is quickly and accurately adjusted through the self-adaptive torque mode of the whole vehicle, so that the vehicle is in a stable static state; when the torque self-adaption calculation mode selects an in-gear torque self-adaption mode, calculating a control filter coefficient of the engine self-adaption torque according to vehicle state information; and calculating the self-adaptive torque of the engine according to the control filter coefficient of the self-adaptive torque of the engine, and taking the self-adaptive torque of the engine as a self-adaptive torque calculation result.
When the engine accessory mode is selected, the method is used for calculating the work of the engine accessory and temporarily controlling the state of the engine accessory when the engine is in an idle running state in the whole vehicle sliding process. When the engine accessory mode is selected in a torque self-adaptive calculation mode, the engine electronic control accessory is required to be temporarily disconnected, and a control filter coefficient of the engine accessory torque is calculated according to different accessory working states; and calculating the engine accessory torque according to the control filter coefficient of the calculated engine accessory torque, and taking the calculated engine accessory torque as a torque self-adaptive calculation result.
S5, calculating and obtaining the latest minimum self-adaptive torque of the engine according to the torque self-adaptive calculation result and the minimum self-adaptive torque reference value of the engine on the torque calculation path of the engine, and controlling the engine;
the engine minimum adaptive torque reference includes an engine adaptive torque reference and an engine accessory torque reference.
When the torque self-adaptive calculation mode adopts a normal idle mode or a gear torque self-adaptive mode, adopting a new engine accessory torque reference value as an engine minimum self-adaptive torque reference value to calculate the engine minimum self-adaptive torque; when the torque adaptive calculation mode adopts an engine accessory mode, a new engine adaptive torque reference value is adopted as an engine minimum adaptive torque reference value to calculate the engine minimum adaptive torque.
S6, outputting a torque self-adaptive calculation result to a torque calculation path of the engine to serve as a new minimum self-adaptive torque reference value of the engine;
if the step S4 in the current cycle adopts the engine accessory mode, namely, the self-adaptive calculation result of the generated torque in the step S4 is adopted as a new engine accessory torque reference value for the calculation of the next cycle; if the step S4 in the present cycle adopts the normal idle mode or the in-gear torque adaptive mode, that is, the torque adaptive calculation result generated in the step S4 is adopted as a new engine adaptive torque reference value for the next cycle calculation.
S7, when the whole vehicle runs normally, the steps S2-S6 are executed circularly until the whole vehicle stops running, and then the step S8 is executed;
s8, calculating and storing the minimum self-adaptive torque reference value of the engine according to all the generated torque self-adaptive calculation results: calculating the average value of all torque self-adaptive calculation results obtained by adopting an engine accessory mode to calculate when the step S4 is circularly executed, and storing the NVV value of the average value as an engine accessory torque reference value; and (4) calculating the average value of all torque adaptive calculation results obtained by adopting the normal idle mode and the gear torque adaptive mode when the step (S4) is circularly executed, and storing the NVV value of the average value as an engine adaptive torque reference value.
In different calculation modes, the calculation is carried out by calculating the self-adaptive torque of the engine and the torque of an engine accessory, and when the release condition of the self-adaptive state of the torque or the condition of the self-adaptive torque mode of the torque is not met in the process of finally calculating the minimum self-adaptive torque of the engine, the calculation is carried out.
When the engine is normally operated, the minimum self-adaptive torque calculation is interrupted because the torque self-adaptive state release condition or the torque self-adaptive torque mode condition is not met, the engine enters the judging process of the torque self-adaptive state release condition, and when the torque self-adaptive state release condition is met again, the minimum self-adaptive torque calculation of the engine is carried out.
When the engine minimum adaptive torque calculation is interrupted due to the vehicle key being changed from ACC gear to OFF gear, the engine will have NVV values stored.
Under different calculation modes, the minimum self-adaptive torque of the engine is calculated through the self-adaptive torque of the engine and the torque of an engine accessory, the minimum self-adaptive torque of the engine is continuously updated in the whole driving cycle, and finally, the NVV value is stored in the power-down afterrun process of the engine.
As shown in fig. 2, the engine minimum adaptive torque calculation module reads the NVV value of the last learned latest engine minimum adaptive torque reference value after the engine is powered on, and when the vehicle is just started, the engine minimum adaptive torque calculation module stores the NVV value of the engine minimum adaptive torque reference value using the last driving cycle. When the torque self-adaptation state release condition is met and the torque self-adaptation mode is judged, the engine minimum self-adaptation torque calculation module calculates the engine minimum self-adaptation torque according to the preset loss torque of the engine, the indicated torque of the engine, the engine minimum self-adaptation torque reference value and the torque self-adaptation calculation result, after the whole calculation is completed, the engine minimum self-adaptation torque is updated to a control strategy main torque path, and the NVV value of the engine minimum self-adaptation torque learning value is updated and stored in an engine afterun stage.
As shown in fig. 3, a torque adaptive state release condition; the vehicle key is changed from an OFF gear to an ACC gear, whether an engine or other faults exist or not is observed, after the vehicle is confirmed to be fault-free, the vehicle key is changed from the ACC gear to an ON gear, the engine is started, after the engine is started normally, the state of the whole vehicle is obtained through a CAN bus, meanwhile, the engine state such as an engine running mode, the engine temperature, the engine rotating speed, the combustion mode and other control and regulation are judged, and whether the torque self-adaptive state release condition is met or not is judged through the engine rotating speed and the torque state.
Torque adaptive state release condition:
1) Vehicle state:
vehicle transmission state: MT or AMT; battery voltage state: voltage normal = 1; abnormal voltage=0;
2) An engine operating state; normal operation or idle state
3) The water temperature of the engine is at a normal working threshold value; 85 ℃ < normal water temperature of engine < 102 ℃ (calibratable value)
4) An engine speed deviation threshold; 20rpm (calibratable value)
5) An engine combustion mode; such as PDF regeneration, DOC ignition, etc.;
6) Other control conditions; if the fault condition exists, the current state of the sensor actuator part;
when the vehicle and engine conditions are met and the torque conditions are also met, the torque adaptive release state is met, the torque adaptive torque mode selection module enters the selection of the torque adaptive calculation mode, and the vehicle state, the engine running state, the engine water temperature, the rotational speed deviation value and other control conditions are provided for the adaptive torque calculation module.
As shown in fig. 4, the vehicle state, the engine running state, the engine water temperature, the rotation speed deviation value and other control conditions are satisfied, the selection of the torque self-adaption mode is completed through the information of the vehicle speed, the gear, the ramp state and the like, and the engine self-adaption torque mode and the calculation comprise three modes: the method comprises the following steps of calculating engine accessory torque and engine self-adaptive torque through different modes in a common idle mode, an engine accessory mode and an in-gear torque self-adaptive mode of the AMT whole vehicle;
torque adaptive mode selection conditions:
vehicle speed state: vehicle speed=0; the vehicle speed is not equal to 0; gear signal, non-neutral=0; neutral = 1. Ramp status: climbing state=0; non-climbing state = 1;
entry conditions for normal idle mode: vehicle speed=0; gear = 1, neutral; and performing engine loss torque adaptive calculation.
Entry conditions for engine accessory mode: the vehicle speed is not equal to 0; gear = 1, neutral; and performing engine accessory torque adaptive calculation.
Entry conditions in gear torque adaptation mode (used only in AMT vehicles): vehicle speed=0; gear=0, non-neutral, ramp state=1, hill climbing mode; engine torque adaptive calculation (including driveline torque);
vehicle speed=0; gear=0, non-neutral, ramp state=0, non-climbing mode; engine torque adaptive calculation (including driveline torque).
As shown in fig. 5, in the engine accessory calculation mode, the adaptive torque calculation function module may require the engine electronic control accessory to be temporarily disconnected according to different modes and activation conditions; the self-adaptive torque module calculates a control filter coefficient of engine accessory torque according to different accessory working states, and finally outputs the engine accessory torque to the engine minimum self-adaptive torque calculation module for calculating the engine minimum self-adaptive torque control. Meanwhile, after the vehicle stops running, the self-adaptive torque calculation function module takes an average value of all torque self-adaptive calculation results obtained by calculating in an engine accessory mode, and after the EECU is powered down, relevant storage is completed, and the NVV value of the average value is used as the NVV value of the engine accessory torque reference value for executing operation after the next power-up.
As shown in fig. 6, in the normal idle mode and in the gear torque self-adaptive mode, the self-adaptive torque calculation function module calculates self-adaptive torque according to different modes and activation conditions, and when the self-adaptive torque calculation function module calculates a control filter coefficient of the self-adaptive torque of the engine according to different states of the selected self-adaptive mode, the self-adaptive torque of the engine is finally output, and the control filter coefficient is output to the minimum self-adaptive torque calculation module of the engine to calculate the minimum self-adaptive torque of the engine. Meanwhile, after the vehicle stops running, the self-adaptive torque calculation function module takes an average value of all torque self-adaptive calculation results obtained by calculation in a normal idle mode and a gear torque self-adaptive mode, and after EECU is powered down, relevant storage is completed, and the NVV value of the average value is used as the NVV value of an engine self-adaptive torque reference value for executing operation after the next power-up;
the average value calculation method of the torque adaptive calculation result is as follows:
wherein X1, X2, … Xn represent stored torque adaptive calculation results for a certain time in a certain mode; n represents the number of times a certain mode in an engine cycle has completed calculation; m is the calculated average value. Wherein the normal idle mode and the in-gear torque adaptation mode are considered to be the same mode, and the engine accessory mode is considered to be another mode.
As shown in fig. 7, the engine minimum adaptive torque calculation module calculates an engine minimum adaptive torque control, calculates an engine minimum adaptive torque based on the engine adaptive torque and the engine accessory torque, and outputs the engine minimum adaptive torque to the control strategy main torque path, and finally controls the actuator to complete closed loop control of the idle speed of the engine.
In embodiment 1, a vehicle key is turned from an OFF gear to an ACC gear, whether an engine or other faults exist is observed, after confirming that the vehicle has no faults, the vehicle key is turned from the ACC gear to an ON gear, the engine is started, after the engine is normally started, the vehicle state is obtained through a CAN bus, and meanwhile, the engine state, such as an engine running mode, an engine temperature, an engine rotational speed, a combustion mode and other control adjustment, is determined, and whether a torque adaptive state release condition is satisfied or not is determined through the engine rotational speed and a torque state, as shown in fig. 3:
1) Vehicle state:
vehicle transmission state: MT; state of battery jar: voltage normal = 1;
2) An engine operating state; idle state
3) The water temperature of the engine is at a normal working threshold value of 85-102 ℃;
4) An engine speed deviation threshold; not less than 30rpm
5) An engine combustion mode; a normal idle mode;
6) Other control conditions; the sensor actuator part is in an idle working state under the condition of no fault;
the vehicle and engine conditions are met, the torque adjustment release condition is met, the torque self-adaptive release state is met, the selection of a torque self-adaptive calculation mode is entered, and the vehicle state, the engine running state, the engine water temperature, the rotation speed deviation value and other control conditions are provided for the self-adaptive torque calculation module;
as shown in fig. 4, the vehicle state, the engine running state, the engine water temperature, the rotational speed deviation value and other control conditions are satisfied, and the selection of the torque self-adaptive mode is completed through the information of the vehicle speed, the gear, the ramp state and the like, wherein the vehicle speed state is as follows: the vehicle speed is not equal to 0; gear signal = 1, neutral; the torque self-adaptive mode meets the calculation requirement of the engine accessory mode, and the torque self-adaptive mode enters the engine accessory mode;
the self-adaptive torque calculation module adopts an engine accessory mode, as shown in fig. 5, different accessory modes are selected, and EECU judges the states of accessories such as an engine accessory electric control water pump, an electric control air compressor, an air conditioner and the like; the self-adaptive torque calculation module timely controls an electric control accessory of the engine, disconnects the electric control accessory such as an electric control water pump, an electric control air compressor or an air conditioner in a short time, calculates a filter value of self-adaptive torque of the engine accessory, finally outputs the torque value of the engine accessory, and outputs the torque value to the minimum self-adaptive torque calculation module of the engine to calculate the minimum self-adaptive torque of the engine. Meanwhile, after the vehicle stops running, the self-adaptive torque calculation function module takes an average value of all torque self-adaptive calculation results obtained by calculating in an engine accessory mode, and after the EECU is powered down, relevant storage is completed, and the NVV value of the average value is used as the NVV value of the engine accessory torque reference value for executing operation after the next power-up.
As shown in fig. 7, the engine minimum adaptive torque calculation module calculates the latest engine minimum adaptive torque according to the engine adaptive torque calculated in the previous cycle and the engine accessory torque just calculated, and outputs the latest engine minimum adaptive torque to the control strategy main torque path, and finally the control actuator completes the closed-loop control of the engine speed.
After the electronic control accessory of the engine is worn in the whole life cycle, the work of the accessory is changed, the control time of the engine rotating speed is prolonged, the self-adaptive torque of the engine accessory is calculated, the problem is solved, the control time of the engine rotating speed is expected to be reduced by 5%, and the oil consumption is expected to be reduced by 1% in the life cycle.
In embodiment 2, a vehicle key is turned from an OFF gear to an ACC gear, whether an engine or other faults exist is observed, after confirming that the vehicle has no faults, the vehicle key is turned from the ACC gear to an ON gear, the engine is started, after the engine is normally started, the vehicle state is obtained through a CAN bus, and meanwhile, the engine state, such as an engine running mode, an engine temperature, an engine rotational speed, a combustion mode and other control adjustment, is determined, and whether a torque adaptive state release condition is satisfied or not is determined through the engine rotational speed and a torque state, as shown in fig. 3:
1) Vehicle state:
vehicle transmission state: MT; state of battery jar: voltage normal = 1;
2) An engine operating state; idle state
3) The water temperature of the engine is at a normal working threshold value of 85-102 ℃;
4) An engine speed deviation threshold; not less than 30rpm
5) An engine combustion mode; a normal idle mode;
6) Other control conditions; the sensor actuator part is in a normal working state under the condition of no fault;
the vehicle and engine conditions are met, the torque adjustment release condition is met, the torque self-adaptive release state is met, the selection of a torque self-adaptive calculation mode is entered, and the vehicle state, the engine running state, the engine water temperature, the rotation speed deviation value and other control conditions are provided for the self-adaptive torque calculation module;
as shown in fig. 4, the vehicle state, the engine running state, the engine water temperature, the rotational speed deviation value and other control conditions are satisfied, and the selection of the torque self-adaptive mode is completed through the information of the vehicle speed, the gear, the ramp state and the like. Vehicle speed state: vehicle speed=0; gear signal = 1, neutral; the torque self-adaptive mode meets the calculation requirement of the normal idle mode, and the torque self-adaptive mode enters the normal idle mode.
The self-adaptive torque calculation module adopts a normal idle mode, as shown in fig. 6, the self-adaptive torque calculation module calculates a filtering value of the normal idle self-adaptive torque of the engine, and finally outputs an engine self-adaptive torque value to the engine minimum self-adaptive torque calculation module for calculating the minimum self-adaptive torque of the engine. Meanwhile, after the vehicle stops running, the self-adaptive torque calculation function module takes an average value of all torque self-adaptive calculation results obtained by calculation in a normal idle mode and a gear torque self-adaptive mode, and after the EECU is powered down, relevant storage is completed, and the NVV value of the average value is used as the NVV value of the engine self-adaptive torque reference value for executing operation after the next power-up.
The minimum engine adaptive torque control is calculated as shown in fig. 7, the latest minimum engine adaptive torque is calculated according to the engine adaptive torque just after calculation and the engine accessory torque calculated in the last cycle, and is output to a control strategy main torque path, and finally the actuator is controlled to complete closed-loop control of the engine speed.
After the mechanical parts of the engine are worn in the whole life cycle, the friction work is changed, the control time of the engine speed is prolonged, the calculation of the self-adaptive torque of the engine at the normal idle speed is carried out, the problem is solved, and the control time of the engine speed is expected to be reduced by 5%, and the oil consumption is expected to be reduced by 2% in the life cycle.
In embodiment 3, the AMT vehicle key is turned from the OFF gear to the ACC gear, whether an engine or other faults exist is observed, after confirming that the vehicle has no faults, the vehicle key is turned from the ACC gear to the ON gear, the engine is started, after the engine is normally started, the vehicle state is obtained through the CAN bus, and meanwhile, the engine state, such as the engine running mode, the engine temperature, the engine rotational speed, the combustion mode and other control adjustment, is determined, and whether the torque adaptive state release condition meets the torque adaptive state release condition shown in fig. 3 or not is determined through the engine rotational speed and the torque state:
1) Vehicle state:
vehicle transmission state: AMT; state of battery jar: voltage normal = 1;
2) An engine operating state; idle state
3) The water temperature of the engine is at a normal working threshold value of 85-102 ℃;
4) An engine speed deviation threshold; not less than 30rpm
5) An engine combustion mode; a normal idle mode;
6) Other control conditions; the sensor actuator part is in a normal working state under the condition of no fault;
the vehicle and engine conditions are satisfied, the torque adjustment release condition is also satisfied, the torque self-adaptive release state is satisfied, and the selection of the torque self-adaptive calculation mode is entered. Simultaneously, the vehicle state, the engine running state, the engine water temperature, the rotating speed deviation value and other control conditions are provided for the self-adaptive torque calculation module;
as shown in fig. 4, the vehicle state, the engine running state, the engine water temperature, the rotational speed deviation value and other control conditions are satisfied, and the selection of the torque self-adaptive mode is completed through the information of the vehicle speed, the gear, the ramp state and the like. Vehicle speed state: vehicle speed=0; gear signal=0, non-neutral, ramp state=0; the torque adaptation mode meets the calculation requirements for calculating an in-gear torque adaptation mode, which enters the in-gear torque adaptation mode as shown in fig. 6.
As shown in fig. 6, the adaptive torque calculation function module calculates a filtered value of the engine in-gear adaptive torque, and finally outputs an engine adaptive torque value, and outputs the engine adaptive torque value to the engine minimum adaptive torque calculation module for calculating the engine minimum adaptive torque control. Meanwhile, after the vehicle stops running, the self-adaptive torque calculation function module takes an average value of all torque self-adaptive calculation results obtained by calculation in a normal idle mode and a gear torque self-adaptive mode, and after EECU is powered down, relevant storage is completed, and the NVV value of the average value is used as the NVV value of the engine self-adaptive torque reference value for executing operation after the next power-up;
as shown in fig. 7, the engine minimum adaptive torque calculation module calculates the latest engine minimum adaptive torque according to the engine adaptive torque just after calculation and the engine accessory torque calculated in the last cycle, and outputs the latest engine minimum adaptive torque to the control strategy main torque path, and finally the control actuator completes the closed-loop control of the engine speed.
After the mechanical parts of the engine are worn in the whole life cycle, the friction work is changed, the control time of the engine speed is prolonged, the calculation of the self-adaptive torque of the engine at the normal idle speed is carried out, the problem is solved, and the control time of the engine speed is expected to be reduced by 5%, and the oil consumption is expected to be reduced by 3% in the life cycle.
The invention provides a non-transitory computer readable medium of a minimum torque self-adaptive control method of an automobile engine, which comprises the following steps: instructions stored therein, wherein the instructions, when executed by one or more processors, cause the one or more processors to perform the method described in the foregoing claims.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flow diagrams and block diagrams in the figures, which illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in the embodiment of the present invention may be integrated together to form a separate part, or each module may exist alone, or two or more modules may be integrated to form a separate part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a smart phone, a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
What is not described in detail in this specification is of the prior art known to those skilled in the art
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. A minimum torque self-adaptive control method of an automobile engine is characterized in that: the method comprises the following steps:
s1, initializing an engine control unit after power-on, reading a stored minimum self-adaptive torque reference value of an engine and initializing the minimum self-adaptive torque reference value to a torque calculation path of the engine;
s2, acquiring vehicle state information after the engine is started normally, judging whether a torque self-adaptive state release condition is met, if yes, executing step S3, if not, continuing to execute step S2,
s3, selecting a torque self-adaptive calculation mode according to the running state of the vehicle;
s4, generating a torque self-adaptive calculation result according to the selected torque self-adaptive calculation mode and combining vehicle state information;
s5, calculating and obtaining the latest minimum self-adaptive torque of the engine according to the torque self-adaptive calculation result and the minimum self-adaptive torque reference value of the engine on the torque calculation path of the engine, and controlling the engine;
s6, outputting a torque self-adaptive calculation result to a torque calculation path of the engine to serve as a new minimum self-adaptive torque reference value of the engine;
s7, when the whole vehicle runs normally, the steps S2-S6 are executed circularly until the whole vehicle stops running, and then the step S8 is executed;
and S8, calculating and storing the minimum self-adaptive torque reference value of the engine according to all the generated torque self-adaptive calculation results.
2. The method for adaptively controlling the minimum torque of an automobile engine according to claim 1, wherein: in the step S2, whether the release condition of the torque adaptive state is satisfied is determined according to the engine running mode, the engine temperature, the engine rotational speed, the combustion mode, the control adjustment of the electric control accessory, the engine rotational speed and the torque state.
3. The method for adaptively controlling the minimum torque of an automobile engine according to claim 1, wherein: in step S3, a torque adaptive calculation method is selected according to the speed and gear of the vehicle.
4. A method for adaptively controlling a minimum torque of an automobile engine according to claim 3, wherein: the torque adaptive calculation mode comprises a common idle mode; and when the vehicle speed is zero and the engine is in an idle state, adopting a normal idle mode, wherein the normal idle mode is used for calculating and obtaining the self-adaptive torque of the engine.
5. The method for adaptively controlling the minimum torque of an automobile engine according to claim 4, wherein: the torque adaptive calculation mode includes an engine accessory mode; an engine accessory mode is employed when the vehicle is coasting and the engine is idling, the engine accessory mode being used to calculate an engine accessory torque.
6. The method for adaptively controlling the minimum torque of the automobile engine according to claim 5, wherein: the torque adaptive calculation mode comprises an in-gear torque adaptive mode, wherein the in-gear torque adaptive mode is used for a vehicle adopting an AMT, and is adopted when the vehicle adopting the AMT is in gear and the whole vehicle is in a static state, and the in-gear torque adaptive mode is used for calculating and obtaining the engine adaptive torque.
7. The method for adaptively controlling the minimum torque of an automobile engine according to claim 4, wherein: in the step S4, when the torque adaptive calculation mode selects the normal idle mode, a control filter coefficient of the engine adaptive torque is calculated according to the vehicle state information; and calculating the engine loss torque according to the calculated control filter coefficient of the engine self-adaptive torque, and taking the calculated engine loss torque as a torque self-adaptive calculation result.
8. The method for adaptively controlling the minimum torque of the automobile engine according to claim 5, wherein: in the step S4, when the engine accessory mode is selected in the torque adaptive calculation mode, the engine electronic control accessory is required to be temporarily disconnected, and the control filter coefficient of the engine accessory torque is calculated according to different accessory working states; and calculating the engine accessory torque according to the control filter coefficient of the calculated engine accessory torque, and taking the calculated engine accessory torque as a torque self-adaptive calculation result.
9. The method for adaptively controlling the minimum torque of an automobile engine according to claim 6, wherein: in the step S4, when the torque adaptive calculation mode selects the in-gear torque adaptive mode, a control filter coefficient of the engine adaptive torque is calculated according to the vehicle state information; and calculating the self-adaptive torque of the engine according to the control filter coefficient of the self-adaptive torque of the engine, and taking the self-adaptive torque of the engine as a self-adaptive torque calculation result.
10. The method for adaptively controlling the minimum torque of an automobile engine according to claim 6, wherein: the engine minimum adaptive torque reference value comprises an engine adaptive torque reference value and an engine accessory torque reference value;
when executing the step S6, if the step S4 in the current cycle adopts the engine accessory mode, namely, the generated torque self-adaptive calculation result of the step S4 is adopted as a new engine accessory torque reference value for the next cycle calculation; if the step S4 in the current cycle adopts a normal idle mode or an in-gear torque self-adaption mode, namely, a torque self-adaption calculation result generated by the step S4 is adopted as a new engine self-adaption torque reference value for calculation of the next cycle;
when executing step S5, when the torque self-adaptive calculation mode adopts a normal idle mode or a gear torque self-adaptive mode, adopting a new engine accessory torque reference value as an engine minimum self-adaptive torque reference value to calculate the engine minimum self-adaptive torque; when the torque self-adaption calculation mode adopts an engine accessory mode, adopting a new engine self-adaption torque reference value as an engine minimum self-adaption torque reference value to calculate the engine minimum self-adaption torque;
in step S8, calculating an average value of all the torque adaptive calculation results obtained by calculating in the engine accessory mode when the step S4 is executed in a cyclic manner, and storing the NVV value of the average value as an engine accessory torque reference value; and (4) calculating the average value of all torque adaptive calculation results obtained by adopting the normal idle mode and the gear torque adaptive mode when the step (S4) is circularly executed, and storing the NVV value of the average value as an engine adaptive torque reference value.
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