CN113511185B

CN113511185B - Engine torque output control method, engine torque output control device, computer equipment and storage medium

Info

Publication number: CN113511185B
Application number: CN202010280515.7A
Authority: CN
Inventors: 张龙; 郑建业; 曹龙涛
Original assignee: Beijing Foton Cummins Engine Co Ltd
Current assignee: Beijing Foton Cummins Engine Co Ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2022-12-09
Anticipated expiration: 2040-04-10
Also published as: CN113511185A

Abstract

The invention provides an engine torque output control method, an engine torque output control device, a computer device and a storage medium, wherein the method comprises the steps of obtaining current state parameters of a vehicle; acquiring a first behavior variable corresponding to the interval of the state parameter from a plurality of behavior variables according to the interval of the state parameter, and performing variable value operation on the first behavior variable according to a preset rule, wherein each behavior variable corresponds to a torque request characteristic library; detecting whether the first behavior variable after the value changing operation reaches a confidence limit value; when the first behavioral variable reaches a confidence limit, a library of torque request characteristics corresponding to the first behavioral variable is obtained. Because the state of the vehicle is related to the running working condition, the torque output of the engine is more accordant with the current driving working condition of the vehicle, the accelerator characteristic can adapt to the driving working condition of the vehicle, the instant output power of the engine is improved, the driving efficiency is improved, the fuel economy of the engine is effectively improved, and the power performance and the fuel economy of the vehicle are both considered.

Description

Engine torque output control method, engine torque output control device, computer equipment and storage medium

Technical Field

The invention relates to the technical field of torque output control of a transmitter, in particular to a method and a device for controlling torque output of an engine, computer equipment and a storage medium.

Background

In general, a driver controls an accelerator pedal and a gear (a manual transmission vehicle) to Control acceleration, deceleration or maintain a current vehicle speed, and the accelerator pedal and the gear have a corresponding relationship with the vehicle speed, and the relationship characteristic is determined and executed by an ECM (Engine Control Module) to learn such behavior of the driver in a specific period of time.

In a conventional engine control strategy, a driver's opening degree control of an Accelerator pedal of a vehicle is used as an input, an engine ECM calculates an actual Torque currently requested by the driver through linear interpolation according to a current rotation speed and a requested Accelerator opening degree, as shown in table 1, an ABT (Accelerator Based Torque request) table shows that an X axis represents an engine rotation speed/unit rpm, a Y axis represents an Accelerator opening degree/unit%, and if the engine rotation speed is 700rpm and the Accelerator opening degree is 30%, a driver requested Torque is 737Nm, an oil injection amount is calculated through the Torque, and finally oil injection and Torque output are realized.

TABLE 1 ABT Table

X/Y	10	20	30	50	60	70	90	100
									0	494	686	872	1221	1384	1540	1831	2048
450	246	483	737	1227	1420	1594	1896	2048
									600	246	483	737	1227	1420	1594	1896	2048
700	246	483	737	1227	1420	1594	1896	2048

However, the driving conditions are complicated and changeable, such as the change of terrain and vehicle load, etc., the requirement for the torque response of the engine changes accordingly, for example, a no-load vehicle does not need large torque when running on a straight road, and climbing, overtaking, etc. need to immediately respond to the large torque, and the driving habits among drivers are also obviously different, so that the driving efficiency is influenced, and even traffic accidents are easily caused by insufficient power when the vehicle runs in a certain engine speed interval, a certain accelerator pedal working stroke or a certain special road section. On the other hand, rough driving habits, such as frequent and rapid acceleration, severe accelerator stepping and the like, also have certain negative effects on the fuel economy of the vehicle. At present, the traditional single accelerator characteristic curve is not enough to adapt to variable driving conditions.

Disclosure of Invention

In view of the above, it is necessary to provide an engine torque output control method, apparatus, computer device and storage medium in view of the above technical problems.

An engine torque output control method comprising:

acquiring at least one current state parameter of the vehicle;

acquiring a first behavior variable corresponding to the interval in which the state parameter is positioned from a plurality of behavior variables according to the interval in which the state parameter is positioned, and performing variable value operation on the first behavior variable according to a preset rule, wherein each behavior variable corresponds to a torque request characteristic library;

detecting whether the first behavior variable after the value changing operation reaches a confidence limit value;

when the first behavior variable reaches the confidence limit value, acquiring the torque request characteristic library corresponding to the first behavior variable;

adjusting a torque output by an engine of the vehicle according to an output torque reference value corresponding to at least one current state parameter of the vehicle recorded in the torque request characteristic library.

In one embodiment, the step of retrieving the library of torque request characteristics corresponding to the first behavioural variable when the first behavioural variable reaches the confidence limit comprises:

when the first behavior variable reaches the confidence limit value, assigning the confidence limit value of the first behavior variable to intermediate variables, and freezing the first behavior variable, wherein the value of each intermediate variable corresponds to one torque request characteristic library;

the torque request characteristic library corresponding to the value of the intermediate variable is obtained.

and when the first behavior variable reaches the confidence limit value, restoring a second behavior variable which has the original value as the confidence limit value in the plurality of behavior variables to an initial value, and acquiring the torque request characteristic library corresponding to the first behavior variable.

In one embodiment, further comprising:

detecting whether a stop variable value triggering condition exists;

and when the stopping variable value triggering condition exists, stopping performing variable value operation on the behavior variable corresponding to the stopping variable value triggering condition, and restoring the behavior variable corresponding to the stopping variable value triggering condition to an initial value.

In one embodiment, further comprising:

detecting whether an overtaking signal is received or not;

and when the overtaking signal is detected, acquiring the torque request characteristic library corresponding to the overtaking signal, and when the overtaking ending signal is received, acquiring the torque request characteristic library corresponding to the behavior variable with the value as the confidence limit value.

In one embodiment, the number of the behavior variables is three, and the number of the torque request characteristic library is three, and the three behavior variables include an aggressive behavior variable, a balanced behavior variable, and a conservative behavior variable.

In one embodiment, the initial value of each of the behavior variables is subjected to a value changing operation at least twice to reach a confidence limit.

An engine torque output control device comprising:

the state parameter acquisition module is used for acquiring at least one current state parameter of the vehicle;

the variable value operation module is used for acquiring a first behavior variable corresponding to the interval in which the state parameter is positioned from a plurality of behavior variables according to the interval in which the state parameter is positioned, and performing variable value operation on the first behavior variable according to a preset rule, wherein each behavior variable corresponds to a torque request characteristic library;

the confidence limit detection module is used for detecting whether the first behavior variable after the variable value operation reaches a confidence limit value;

a torque request characteristic library acquisition module, configured to acquire the torque request characteristic library corresponding to the first behavior variable when the first behavior variable reaches the confidence limit;

a torque output module for adjusting a torque output by an engine of the vehicle according to an output torque reference value corresponding to at least one current state parameter of the vehicle recorded in the torque request characteristic library.

A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor when executing the computer program implements the steps of:

acquiring at least one current state parameter of the vehicle;

acquiring a first behavior variable corresponding to the interval of the state parameter from a plurality of behavior variables according to the interval of the state parameter, and performing variable value operation on the first behavior variable according to a preset rule, wherein each behavior variable corresponds to a torque request characteristic library;

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

acquiring at least one current state parameter of the vehicle;

According to the engine torque output control method, the engine torque output control device, the computer equipment and the storage medium, the behavior variable is subjected to variable value operation according to the state parameters of the vehicle, so that the behavior variable can be subjected to variable value according to the current state of the vehicle, when the variable value of the behavior variable reaches the confidence limit value, the corresponding torque request characteristic library is obtained, and the fuel injection quantity of the engine is controlled by the torque request characteristic library.

Drawings

FIG. 1A is a schematic flow chart diagram illustrating a method of controlling engine torque output according to one embodiment;

FIG. 1B is a schematic flow chart diagram illustrating a method of controlling engine torque output according to another embodiment;

FIG. 1C is a schematic partial flow chart diagram of a method of controlling engine torque output according to one embodiment;

FIG. 1D is a schematic flow diagram illustrating a portion of a method for controlling engine torque output according to one embodiment;

FIG. 2 is a block diagram showing the construction of an engine torque output control apparatus according to an embodiment;

FIG. 3 is a diagram of the internal structure of a computer device in one embodiment;

FIG. 4 is a diagram of selection logic for the ABT table;

FIG. 5 is a flowchart illustrating a logic implementation of a method for controlling engine torque output based on an application scenario, according to one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In one embodiment, as shown in fig. 1A, there is provided an engine torque output control method,

at least one current state parameter of the vehicle is obtained, step 110.

Specifically, the state parameter is used for reflecting the current working condition of the vehicle, and in this step, the current running working condition of the vehicle is obtained by obtaining the state parameter of the vehicle. In particular, the state parameter is a parameter of the operating state of the vehicle or of a transmitter of the vehicle. For example, the state parameters include engine speed, transmission gear, vehicle running speed, accelerator pedal opening and opening change rate, brake pedal signal, vehicle weight, road gradient and the like. In this embodiment, the obtained state parameters are used to determine which torque request characteristic library is selected, and therefore, the state parameters may be one type or multiple types. For example, the vehicle running speed and the engine speed are acquired. For another example, when the vehicle running speed reaches a preset speed, the rotation speed of the transmitter is acquired.

Step 130, according to the interval in which the state parameter is located, obtaining a first behavior variable corresponding to the interval in which the state parameter is located from a plurality of behavior variables, and performing variable value operation on the first behavior variable according to a preset rule, wherein each behavior variable corresponds to a torque request characteristic library.

Specifically, for each state parameter, a plurality of sections can be divided for reflecting different states of the vehicle, and each section of the state parameter corresponds to a behavior variable. The behavior variable is used to count the number of times the state parameter is in each interval, for example, the behavior variable is stored in a Counter (Counter), each behavior variable is stored in a Counter, and the variable value operation on the behavior variable is to count the value in the Counter, so that the value of the behavior variable will change once every pair of behavior variables is subjected to the variable value operation. In this embodiment, the value-changing operation on the behavior variable is performed according to a preset rule, where the preset rule may be to increase the value of the behavior variable, or to decrease the value of the behavior variable, or to implement other counting manners. Taking the increase of the values of the behavior variables as an example, the increased values at each time may be equal or unequal, and the increased values may be equal or unequal for different behavior variables. For example, the value for each increment of the behavior variable is 1.

It should be noted that each behavior variable has an initial value, the initial value is also a default value, the behavior variable starts to perform a value-changing operation from the initial value, and the value of each value-changing operation is based on the value after the last value-changing operation.

In the embodiment, a plurality of torque request characteristic libraries are prestored, and each interval of the state parameters corresponds to one action variable, and each action variable corresponds to one torque request characteristic library, so that different driving behaviors correspond to different torque request characteristic libraries, and the engine has different torque outputs at the same accelerator opening under different driving conditions.

It should be understood that each behavior variable is used for corresponding to a driving behavior, the driving behavior can be determined through a state parameter, in one embodiment, whether a section where the state parameter is located is changed or not is detected, and when the section where the state parameter is located is changed or not, a behavior variable corresponding to the section where the state parameter is changed, namely a first behavior variable, is obtained from a plurality of behavior variables, and a value changing operation is performed on the first behavior variable. In this embodiment, each time the state parameter is detected to be in the interval corresponding to the first behavior variable, a value-changing operation is performed on the first behavior variable. Therefore, when the working condition of the vehicle changes, the behavior variable corresponding to the changed working condition is subjected to variable value operation.

In one embodiment, whether the time of the interval in which the state parameter is located is greater than a preset time is detected, and when the time of the interval in which the state parameter is located is greater than the preset time, a first behavior variable corresponding to the interval in which the state parameter is located is acquired from a plurality of behavior variables, and the first behavior variable is subjected to value change operation. In this embodiment, when the vehicle is operated under one working condition for a long time, the behavior variable corresponding to the working condition is subjected to variable value operation.

And 150, detecting whether the first behavior variable after the value changing operation reaches a confidence limit value.

Specifically, the confidence limit is a threshold of the behavior variables, each behavior variable has a confidence limit, and the confidence limits of different behavior variables may be the same or different. After the behavior variable is subjected to one or more variable value operations according to the preset rule, the value of the behavior variable reaches the confidence limit value, in the embodiment, when the accumulation of the variable value operations of the behavior variable reaches a certain number of times, the value of the behavior variable reaches the confidence limit value. And pre-judging the driving behavior by detecting whether the behavior variable is equal to the confidence limit value.

Step 170, when the first behavior variable reaches the confidence limit, acquiring the torque request characteristic library corresponding to the first behavior variable.

In this embodiment, a plurality of torque request characteristic libraries are pre-stored, and each torque request characteristic library corresponds to a behavior variable. In this step, when the first behavior variable reaches the confidence limit value, the torque request characteristic library corresponding to the first behavior variable is obtained, one torque request characteristic library corresponding to the first behavior variable is selected from the plurality of torque request characteristic libraries, the current torque request characteristic library is switched to the selected torque request characteristic library, the output torque of the engine is controlled according to the selected torque request characteristic library, and the fuel injection quantity of the engine is controlled according to the selected torque request characteristic library.

And 190, adjusting the torque output by the engine of the vehicle according to the output torque reference value corresponding to the at least one current state parameter of the vehicle recorded in the torque request characteristic library.

Specifically, when the first behavior variable reaches the confidence limit value, the driving condition corresponding to the first behavior variable is indicated, so that a torque request characteristic library corresponding to the first behavior variable is obtained, and the actually requested torque can be obtained according to the torque output characteristic of the torque request characteristic library, so that the fuel injection quantity of the engine is controlled.

In the above embodiment, the behavior variable is subjected to variable value operation according to the state parameter of the vehicle, so that the behavior variable can be subjected to variable value according to the current state of the vehicle, when the variable value of the behavior variable reaches the confidence limit value, the corresponding torque request characteristic library is obtained, and the fuel injection quantity of the engine is controlled by the torque request characteristic library.

In one embodiment, as shown in FIG. 1B, step 170 comprises:

step 171, assigning the confidence limit value of the first behavior variable to intermediate variables when the first behavior variable reaches the confidence limit value, and freezing the first behavior variable, wherein the value of each intermediate variable corresponds to one torque request characteristic library.

In step 173, the torque request characteristic library corresponding to the value of the intermediate variable is acquired.

In this embodiment, when the first behavior variable performing the value changing operation reaches the confidence limit value of the first behavior variable, the confidence limit value of the first behavior variable is assigned to the intermediate variable, so that the value of the intermediate variable is equal to the confidence limit value of the first behavior variable. It should be understood that the intermediate variable has an initial value that is a confidence limit for one of the behavioral variables, and that when the first behavioral variable reaches the confidence limit, the intermediate variable is transformed from the initial value to the confidence limit for the first behavioral variable.

Specifically, an intermediate variable whose value is used to decide or select the torque request characteristic library is stored in a Decision Counter (DC). In this embodiment, the confidence limits of the different behavior variables are not equal, the intermediate variable has a plurality of values, and the plurality of values of the intermediate variable is equal to the confidence limits of the respective behavior variables. Therefore, the value of each intermediate variable corresponds to a torque request characteristic library, the corresponding torque request characteristic library can be obtained according to the value of the intermediate variable, and the fuel injection quantity of the engine is controlled according to the torque request characteristic library. In addition, in the present embodiment, the first behavior variable is frozen when the confidence limit value of the first behavior variable is assigned to the intermediate variable, and the value of the first behavior variable is not changed by a change in the state parameter of the vehicle after the first behavior variable is frozen. For example, after the first behavior variable is frozen, when it is detected that the state parameter is in the section corresponding to the first behavior variable, the first behavior variable does not perform the variable operation, and the first behavior variable remains unchanged. In this way, it is possible to avoid the first behavior variable exceeding the confidence limit, while on the other hand, since the torque output of the engine at this time matches the first behavior variable, it is not necessary to change the value of the first behavior variable again.

In one embodiment, step 170 comprises: and when the first behavior variable reaches the confidence limit value, restoring a second behavior variable which has the original value as the confidence limit value in the plurality of behavior variables to an initial value, and acquiring the torque request characteristic library corresponding to the first behavior variable.

Specifically, a second behavior variable exists in the plurality of behavior variables before the first behavior variable reaches the confidence limit, and the value of the second behavior variable is the confidence limit. It should be understood that the vehicle is only capable of torque output according to a torque request characteristic library at a certain time, and therefore, when the first behavior variable reaches the confidence limit value of the first behavior variable, the second behavior variable with the confidence limit value is restored to the initial value, so that only one behavior variable currently has a value equal to the confidence limit value, and the torque request characteristic library corresponding to the first behavior variable is selected to control the torque output of the engine.

In one embodiment, the torque request characteristic library corresponding to the second behavior variable is a default torque request characteristic library, that is, the fuel injection amount of the engine is controlled according to the torque request characteristic library corresponding to the second behavior variable by default under the ordinary driving condition of the vehicle.

In one embodiment, when the first behavior variable reaches the confidence limit, the confidence limit of the first behavior variable is assigned to an intermediate variable, a second behavior variable having a confidence limit value among the plurality of behavior variables is restored to an initial value, and the first behavior variable is frozen, wherein each value of the intermediate variable corresponds to one of the torque request characteristics library.

In this way, the intermediate variable is changed from the confidence limit value of the second behavior variable to the confidence limit value of the first behavior variable, the value of the second behavior variable is restored to the initial value, and the first behavior variable is also frozen, so that the second behavior variable and other behavior variables can be subjected to value change operation according to the state parameters, the torque output of the engine can be changed according to the change of the working condition of the vehicle, and in addition, the value change operation of the first behavior variable can be suspended, so that the engine can work according to the stable torque request characteristic library under the condition that the working condition of the vehicle is unchanged or stable.

In one embodiment, as shown in fig. 1C, the engine torque output control method further comprises:

step 115, detecting whether a stop variable triggering condition exists.

And step 116, when the condition for stopping variable value triggering exists, stopping variable value operation on the behavior variable corresponding to the condition for stopping variable value triggering, and restoring the behavior variable corresponding to the condition for stopping variable value triggering to an initial value.

In this embodiment, the stop variable value triggering condition is used to stop the variable value operation on the behavior variable and stop counting. Specifically, when the working condition of the vehicle is in a preset state, a stop variable value triggering condition is triggered. The stop variable triggering condition may be triggered by the vehicle weight, the climbing state, or the like.

For example, whether the vehicle weight is greater than the preset weight is detected, and when the vehicle weight is greater than the preset weight, the value changing operation of the third behavior variable is stopped, and the value of the third behavior variable is restored to the initial value. In this embodiment, the vehicle weight can be calculated according to parameters of a Transmission, and it should be understood that the ECM of the engine has a function of calculating the vehicle body weight, and if the vehicle is matched with an automatic Transmission (AMT), the vehicle body weight can also be calculated through the automatic Transmission.

For example, whether the vehicle is in a climbing state is detected, and when the vehicle is in the climbing state, the value changing operation of the third behavior variable is stopped, and the value of the third behavior variable is restored to the initial value. For example, whether the gradient of the vehicle climbing is greater than a preset angle is detected, and when the gradient of the vehicle climbing is greater than the preset angle, the value changing operation of the third behavior variable is stopped, and the value of the third behavior variable is restored to the initial value. Whether the vehicle is in the climbing state or not is detected, and the vehicle can be obtained through calculation of a Global Positioning System (GPS) signal or a ramp sensor.

Specifically, the aggressive behavior variable, the equilibrium behavior variable and the conservative behavior variable respectively correspond to three pre-judged driving behaviors, and the driving behaviors are used for reflecting the driving violence of the driver. The aggressive behavior variable corresponds to aggressive behavior, when the driving behavior of the driver is aggressive behavior, the aggressive behavior variable shows that the accelerator opening of the driver is larger, so that the oil consumption is higher, the balanced behavior variable corresponds to balanced behavior, the conservative behavior variable corresponds to balanced behavior, and the aggressive behavior variable shows that the accelerator opening of the driver is larger, and the power response of the vehicle is insufficient. Therefore, the torque of the torque request characteristic library corresponding to the aggressive behavior variable is smaller, the output power is smaller, the fuel economy is better, the output power of the torque request characteristic library corresponding to the balanced behavior variable is balanced with the fuel economy, the torque of the torque request characteristic library corresponding to the conservative behavior variable is larger, the output power is larger, and the fuel economy is poorer. It should be understood that, because the driving behavior of the driver is violent, the accelerator opening degree is larger, and larger torque is easy to obtain, therefore, the fuel can be effectively saved through smaller power output and better accelerator economy, and a good fuel saving effect can be achieved under the condition that the driver is violent to drive; when the driving behavior of the driver is relatively conservative, although the fuel economy is better, the power is easy to be insufficient, so that the power response is improved through larger power output, the power performance of the vehicle is better, and the understanding caused by the conservative behavior of the driver can be made up.

In one embodiment, whether a stop variable triggering condition exists is detected, when the stop variable triggering condition exists, the variable operation of the aggressive variable is stopped, and the value of the aggressive variable is restored to the initial value. In the embodiment, when the stop variable value triggering condition is detected, counting of the radical variable is stopped, and the value of the radical variable is restored to the initial value, so that counting of the radical variable can be stopped in the stage that the vehicle weight is overweight or the vehicle climbs the slope, and therefore the torque characteristic that the torque request characteristic library is switched to the torque characteristic with the power output as the main is avoided in the condition that the vehicle weight is overweight or the stage that the vehicle climbs the slope, and the oil saving effect is achieved.

In one embodiment, as shown in fig. 1D, the engine torque output control method further includes:

step 117, detecting whether the overtaking signal is received.

Step 118, when the overtaking signal is detected, acquiring the torque request characteristic library corresponding to the overtaking signal, and when the overtaking ending signal is received, acquiring the torque request characteristic library corresponding to the behavior variable with the value as the confidence limit value.

In one embodiment, whether a overtaking signal is received or not is detected, when the overtaking signal is detected, the torque request characteristic library corresponding to the conservative action variable is obtained, and when the overtaking ending signal is received, the torque request characteristic library corresponding to the value of the current intermediate variable is obtained.

Specifically, the overtaking signal CAN be obtained by judging the opening of the accelerator pedal and the vehicle speed, for example, when the opening of the accelerator pedal is greater than 50% and the vehicle speed exceeds 60km/h, the overtaking signal is judged to be obtained, for example, SPN2368=01 (left turn light is activated) or SPN2370=01 (right turn light is activated) in an indicator light message (PGN 65088 Lighting Data, defined by CAN communication protocol J1939-71) acquired from a CAN (Controller Area Network) bus of the vehicle, and when the algorithm judges that the intention of the driver is overtaking, the torque request characteristic library is switched to the torque request characteristic library corresponding to the conservative behavior variable, so that a better power response is obtained, a torque response is improved, and the power is improved. When overtaking is finished, for example, when the message information of SPN2368=00 and SPN2370=00 is received again, it indicates that the vehicle returns to the single running track at this time, and if the accelerator pedal opening degree returns to 40% or less or the opening degree change rate is greater than-30%/s, the torque request characteristic library is restored to the setting before overtaking.

In one embodiment, the initial value of each of the behavior variables is subjected to a value changing operation at least twice to reach a confidence limit. The variable value operation is that the value of the pair of behavior variables is added with 1, and the difference between the initial value of each behavior variable and the confidence limit value is greater than or equal to 2. For example, the difference between the initial value of the behavior variable and the confidence limit is equal to 3. Therefore, after the behavior variables are subjected to variable value operation for at least 2 times within a certain time, the behavior variables can be accumulated to the confidence limit value from the initial values, so that the driving behavior of a driver can be accurately judged, a torque request characteristic library can be accurately obtained, the torque can be better output, and better fuel economy is achieved.

The following is a specific example:

in this embodiment, when the operating conditions of the vehicle and the engine meet the precondition of activating the adaptive accelerator characteristic, the engine ECM acquires the state parameters of the vehicle, for example, the current engine speed, speed ratio (or gear information), vehicle speed, accelerator pedal opening and opening change rate, brake pedal signal, vehicle weight, road gradient signal, and the like, and determines which mode the driver belongs to in a certain time window according to the state parameters of the vehicle, thereby determining to invoke one of the pre-calibrated ABT tables.

In this embodiment, the signals listed above are compared with calibration values in advance, and the result is stored in a designated Counter (Counter), where the count value in each Counter is the value of a behavior variable, that is, each behavior variable corresponds to a Counter, and when the accumulated Counter is equal to a certain calibration threshold, it is determined that the current behavior of the driver conforms to one of the set models, so as to select a corresponding accelerator characteristic curve, that is, an ABT table, and finally change the response of the engine to the accelerator pedal, and output a torque that meets the current working condition. In this embodiment, four pre-determined driving behaviors are set, which are an aggressive behavior BH1, a balanced behavior BH2, a conservative behavior BH3, and a passing behavior, and corresponding counters are assigned to BH1, BH2, and BH3, as shown in fig. 2, an initial value of the BH1 counter is 3, a confidence limit value is 6, an initial value of the bh2 counter is 0, a confidence limit value is 3, an initial value of the bh3 counter is-3, and a confidence limit value is 0. Overtaking behavior requires a high degree of timeliness of torque response for safety reasons during vehicle travel, so no counter is set and behavior is executed immediately upon confirmation. Correspondingly, three accelerator characteristic curve tables, namely three torque request characteristic libraries ABT1, ABT2 and ABT3 are calibrated, namely a fuel economy point ABT1, a balanced fuel consumption point ABT2 and a dynamic point ABT3 are respectively marked, as shown in fig. 4.

TABLE 2 initial values and confidence limits for individual counters

Referring to fig. 5, according to different driving requirements, vehicle loads and road conditions, the ECM autonomously selects an accelerator characteristic more suitable for the current working condition on the premise of not increasing a sensor or cab hardware, that is, under the condition of the same engine speed and accelerator pedal opening, the output torque is adaptively changed, and a single accelerator characteristic curve under any working condition in the conventional control strategy is replaced. Meanwhile, the algorithm comprises the ABT table pointing to the fuel economy, so that the problem of fuel consumption caused by poor driving habits is solved to a certain extent, and the engine has higher probability of running in an economic area.

The design principle and operation of the present application will be further described with reference to fig. 4 and 5:

when the driving behavior is determined according to different application scenarios, as shown in table 2, three different initial values and confidence limits are respectively assigned to BH1, BH2, and BH3, and the initial values are also default values. In an initial state, the value of the Counter is an initial value, the counting rule of the Counter is that the value in the Counter is added by 1 every time, when one of the counters is increased and accumulated to reach a corresponding confidence limit value, the value of the Counter is given to a Counter DC (precision Counter) which is finally determined, the value of the timer DC is an intermediate variable, the DC is compared with the three confidence limit values of BH1/BH2/BH3, if the value is equal to a certain limit value, the driving behavior is judged, and the driving behavior points to a corresponding ABT table.

The balance behavior BH2 is the algorithm default driving behavior and the initial DC initial value is 3, i.e., ABT2, which balances fuel economy and dynamics, is the engine default throttle characteristic. When any of the signal inputs for determining driving behavior fail, the ECM maintains the current default ABT and the counter suspends counting. Taking the following application scenario 1 as an example, when the condition 1) is met, the BH1 counters are sequentially incremented by 1 from 3, and when the accumulated value reaches the confidence limit value 6, the BH1 counter is frozen and assigned to the DC to make a driving behavior judgment and execute BH1. And if the engine meets the condition of 3) in the driving process, sequentially adding 1 to the BH3 counter from-3, when the accumulated value reaches a confidence limit value of 0, freezing the BH3 counter and changing the DC from the last judgment value of 6 to 0, making a driving behavior judgment and executing BH3, recovering the BH1 counter to be an initial value of 3, and repeating the operation and the like, wherein in the judgment of the driving behavior, the BH1, BH2, BH3 counters and the DC value are stored in the ECM after each power failure of the vehicle.

In application scenario 1, the method for judging the rotating speed state of the vehicle after upshifting comprises the following steps:

when the vehicle speed is more than 30km/h and the accumulation exceeds a certain time, the ECM starts to learn the behavior of a driver according to the engine speed after the vehicle is upshifted and counts, the behavior comprises matching a manual gear (MT) vehicle and an automatic gear (AMT) vehicle, upshifting or downshifting is judged according to the change of the speed ratio, and when gear shifting is carried out, the following judgment is carried out:

1) When the engine speed is in the interval of [1400rpm,2100rpm ], the ECM considers that the engine runs in a higher speed interval for a long time, and the BH1 counter is increased by 1. If the system judges that the vehicle weight signal is larger than 49 tons at the moment or the road gradient signal received by the ECM is larger than a set value, indicating that the vehicle is in a climbing state at the moment, the BH1 counter stops counting and returns to an initial value;

2) When the engine speed is in the interval of [1000rpm,1450rpm ], the ECM considers that the engine operates in a higher torque interval for a long time, and a BH2 counter is increased by 1;

3) When the engine speed is in the interval of [600rpm,1050rpm ], the ECM considers that the engine is in a lower speed and lower torque interval for a long time, and a BH3 counter is increased by 1;

the above ranges of vehicle speed, vehicle weight, and rotational speed are only examples, and may be calibrated differently according to different engine and vehicle applications, and each counter may be stored in the ECM after the vehicle is powered off. For the acquisition of the vehicle weight, the engine ECM has a function of calculating the vehicle weight, and if the vehicle is matched with an automatic transmission (AMT), the transmission also calculates the vehicle weight as the vehicle weight input suspended by the BH1 counter. And for the acquisition of the climbing state, the signal CAN be converted by a ramp sensor of the AMT or a GPS signal and is sent to the engine ECM in the form of a public message on the CAN network.

And (3) in an application scene 2, according to a method for judging the acceleration state of the fixed gear:

when the opening of the accelerator pedal is larger than 40% and the change of the speed ratio is stable in an interval, the vehicle is indicated to be in a fixed gear at present, and after the conditions are met and accumulated for a certain time, the ECM starts to learn the behavior of the driver according to the change rate of the opening of the accelerator pedal and the vehicle speed and counts.

1) When the vehicle speed is more than 30km/h and the change rate of the opening degree of the accelerator pedal operated by the driver exceeds a calibrated value (+ 30%/s), adding 1 to a BH1 counter. If the weight of the vehicle is larger than 49 tons at the moment or the road gradient signal received by the ECM indicates that the vehicle is in a climbing state at the moment, the BH1 counter stops counting and recovers to an initial value;

2) When the vehicle speed is more than 30km/h, the ECM continuously updates and stores the maximum value of the opening degree of the accelerator pedal in the process of the vehicle running, when the accumulated running mileage or the vehicle running time reaches a certain limit value, if the maximum value of the opening degree of the accelerator pedal in the pre-storage mode is less than 90%, the BH3 counter is added with 1, and at the moment, the pre-storage value is reset to 0.

The above speed, pedal opening and rate of change of opening, vehicle weight, maximum value of pedal opening, accumulated mileage or operating time are only examples, and may be calibrated differently according to different engine and vehicle applications and each counter may be stored in the ECM after the vehicle is powered off.

Application scenario 3, a method for judging a passing state:

when the opening of the accelerator pedal is greater than 50% and the vehicle speed exceeds 60km/h, if the engine ECM judges that there is an overtaking intention according to a vehicle signal, for example, SPN2368=01 in an indicator light message (PGN 65088 Lighting Data, defined by CAN communication protocol J1939-71) acquired from a vehicle CAN bus, a left turn light is activated or SPN2370=01, and a right turn light is activated, it is judged that the intention of the driver at this time is overtaking, the dynamic ABT3 is temporarily activated, a torque response is improved, and overtaking is successfully completed. When the ECM again receives the message information of SPN2368=00 and SPN2370=00, indicating that the vehicle is returning to a single track at this time, if the accelerator pedal opening returns to below 40% or the opening change rate is greater than-30%/s, the ABT table is restored to the setting before overtaking.

It should be understood that although the various steps in the flow charts of fig. 1A-1D are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. For example, the steps in fig. 1C may be performed before any step in fig. 1A, or may be performed after any step in fig. 1A, and similarly, the steps in fig. 1D may be performed before any step in fig. 1A, or may be performed after any step in fig. 1A. Moreover, at least some of the steps in fig. 1A-1D may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.

In one embodiment, as shown in fig. 2, there is provided an engine torque output control apparatus comprising:

a state parameter obtaining module 210, configured to obtain at least one current state parameter of the vehicle;

a variable value operation module 230, configured to obtain, according to the interval in which the state parameter is located, a first behavior variable corresponding to the interval in which the state parameter is located from multiple behavior variables, and perform a variable value operation on the first behavior variable according to a preset rule, where each behavior variable corresponds to a torque request characteristic library;

a confidence limit detection module 250, configured to detect whether the first behavior variable after performing the value change operation reaches a confidence limit;

a torque request characteristic library acquisition module 270, configured to acquire the torque request characteristic library corresponding to the first behavior variable when the first behavior variable reaches the confidence limit;

a torque output module 290 for adjusting the torque output by the engine of the vehicle according to an output torque reference value corresponding to at least one current state parameter of the vehicle recorded in the torque request characteristic library.

In one embodiment, the torque request characteristics library acquisition module includes:

the intermediate variable assignment unit is used for assigning the confidence limit value of the first behavior variable to an intermediate variable and freezing the first behavior variable when the first behavior variable reaches the confidence limit value, wherein the value of each intermediate variable corresponds to one torque request characteristic library;

a torque request characteristic library acquisition unit configured to acquire the torque request characteristic library corresponding to the value of the intermediate variable.

In one embodiment, the torque request characteristic library acquisition module is further configured to restore a second behavior variable, which is originally a confidence limit value among the plurality of behavior variables, to an initial value when the first behavior variable reaches the confidence limit value, and acquire the torque request characteristic library corresponding to the first behavior variable.

In one embodiment, the engine torque output control device further includes:

the stop variable value triggering condition detection module is used for detecting whether a stop variable value triggering condition exists;

and the variable value stopping module is used for stopping performing variable value operation on the behavior variable corresponding to the stop variable value triggering condition when the stop variable value triggering condition exists, and restoring the behavior variable corresponding to the stop variable value triggering condition to an initial value.

In one embodiment, the engine torque output control device further includes:

the overtaking signal detection module is used for detecting whether an overtaking signal is received or not;

and the overtaking signal response module is used for acquiring the torque request characteristic library corresponding to the overtaking signal when the overtaking signal is detected, and acquiring the torque request characteristic library corresponding to the behavior variable with the value as the confidence limit value when the overtaking ending signal is received.

In one embodiment, the variable value operation is adding 1 to the values of the pair of behavior variables, each of the behavior variables having an initial value greater than or equal to 2 different from a confidence limit.

For specific limitations of the engine torque output control device, reference may be made to the above limitations of the engine torque output control method, which are not described in detail herein. The respective modules in the engine torque output control apparatus described above may be realized in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, the computer device being deployed on a vehicle, the computer device being an onboard control device. The internal structure thereof may be as shown in fig. 3. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external server through a network connection. The computer program is executed by a processor to implement an engine torque output control method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 3 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, there is provided a computer device comprising a memory storing a computer program and a processor implementing the following steps when the processor executes the computer program:

acquiring at least one current state parameter of the vehicle;

In one embodiment, the processor when executing the computer program further performs the steps of:

In one embodiment, the processor, when executing the computer program, further performs the steps of:

detecting whether a stop variable value triggering condition exists;

and when the stop variable value triggering condition exists, stopping performing variable value operation on the behavior variable corresponding to the stop variable value triggering condition, and restoring the behavior variable corresponding to the stop variable value triggering condition to an initial value.

detecting whether an overtaking signal is received or not;

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

acquiring at least one current state parameter of the vehicle;

In one embodiment, the computer program when executed by the processor further performs the steps of:

assigning the confidence limit value of the first behavioral variable to intermediate variables when the first behavioral variable reaches the confidence limit value, and freezing the first behavioral variable, wherein the value of each intermediate variable corresponds to one of the torque request characteristic libraries;

and when the first behavior variable reaches the confidence limit value, restoring a second behavior variable which is originally of the confidence limit value in the plurality of behavior variables to an initial value, and acquiring the torque request characteristic library corresponding to the first behavior variable.

detecting whether a stop variable value triggering condition exists or not;

detecting whether an overtaking signal is received or not;

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An engine torque output control method characterized by comprising:

acquiring at least one current state parameter of the vehicle;

adjusting a torque output by an engine of the vehicle according to an output torque reference value corresponding to at least one current state parameter of the vehicle recorded in the torque request characteristic library;

the step of retrieving the library of torque request characteristics corresponding to the first behavioral variable when the first behavioral variable reaches the confidence limit comprises:

2. The method of claim 1, wherein the step of retrieving the library of torque request characteristics corresponding to the first behavioral variable when the first behavioral variable reaches the confidence limit comprises:

3. The method of claim 1, further comprising:

detecting whether a stop variable value triggering condition exists;

4. The method of claim 1, further comprising:

detecting whether an overtaking signal is received or not;

5. The method of claim 1, wherein the number of the behavioral variables is three, and the number of the torque request characteristic library is three, and the three behavioral variables include aggressive behavioral variables, equilibrium behavioral variables, and conservative behavioral variables.

6. The method of claim 1, wherein the initial value of each of the behavior variables is subjected to a value change operation at least twice to reach a confidence limit.

7. An engine torque output control apparatus, characterized by comprising:

a torque output module for adjusting a torque output by an engine of the vehicle according to an output torque reference value corresponding to at least one current state parameter of the vehicle recorded in the torque request characteristic library;

the torque request characteristic library acquisition module includes:

the intermediate variable assignment unit is used for assigning the confidence limit value of the first behavior variable to an intermediate variable when the first behavior variable reaches the confidence limit value, and freezing the first behavior variable, wherein the value of each intermediate variable corresponds to one torque request characteristic library;

8. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.