CN110606073B - Light hybrid power system driver torque demand calculation method, storage medium and vehicle - Google Patents

Light hybrid power system driver torque demand calculation method, storage medium and vehicle Download PDF

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CN110606073B
CN110606073B CN201910906883.5A CN201910906883A CN110606073B CN 110606073 B CN110606073 B CN 110606073B CN 201910906883 A CN201910906883 A CN 201910906883A CN 110606073 B CN110606073 B CN 110606073B
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driver
torque demand
gear
vehicle
torque
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CN110606073A (en
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伍庆龙
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FAW Group Corp
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FAW Group Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1005—Transmission ratio engaged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0666—Engine torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/08—Electric propulsion units
    • B60W2710/083—Torque
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Abstract

The invention relates to the technical field of vehicle power control, in particular to a method for calculating a driver torque demand of a light hybrid power system, a storage medium and a vehicle. The method for calculating the torque demand of the driver of the light hybrid power system comprises the following steps of firstly, judging whether a power system has no fault, and starting an engine if the power system has no fault; judging whether the gear of the vehicle is a D gear or an R gear; if the gear of the vehicle is the D gear or the R gear, a driver torque demand calculation module is called, and a driver torque demand calculation result is output. The computer readable storage medium can realize the method and accurately and effectively calculate the torque demand of the driver of the power system. The vehicle can realize the method, meet the driving requirements of drivers and improve the control performance of the whole vehicle.

Description

Light hybrid power system driver torque demand calculation method, storage medium and vehicle
Technical Field
The invention relates to the technical field of vehicle power control, in particular to a method for calculating a driver torque demand of a light hybrid power system, a storage medium and a vehicle.
Background
The 48V mild hybrid Vehicle is being promoted and developed by more and more Vehicle manufacturers because of the advantages of good fuel saving effect, low cost and the like, the 48V mild hybrid Vehicle can be subjected to hybrid transformation on the basis of the traditional Vehicle, a BSG (Belt-driven Starter/Generator, BSG for short) Motor and a Motor Control Unit (MCU for short) are added on the traditional Vehicle, a 48V Battery and a Battery Management System BMS (Battery Management System, BMS for short), a DCDC Direct Current converter (dc Direct Current converter for short) and the like are added on the traditional Vehicle, the Motor is powered by the 48V Battery, the torque capacity of the whole Vehicle is superposed, not only can the driving torque output capacity of the whole Vehicle be ensured, but also the working area of the engine can be optimized through the coordination Control of a VCU (Vehicle Control Unit, VCU for short), finally, the oil consumption and the emission are reduced, and the aims of energy conservation and emission reduction are achieved.
How to distribute and output the torque among all power sources in a 48V mild hybrid electric vehicle needs to identify the torque demand of a driver, and if the torque demand of the driver cannot be accurately calculated, the torque distribution between an engine and a motor cannot be effectively carried out, so that the running control of the whole vehicle and the performance of the vehicle are influenced, and therefore, how to accurately and effectively calculate the torque demand of the driver of a power system is a key problem to be solved at present.
Disclosure of Invention
The invention aims to provide a method for calculating the torque requirement of a driver of a light hybrid power system, which can accurately and effectively calculate the torque requirement of the driver of the power system, meet the driving requirement of the driver and improve the control performance of the whole vehicle.
A second object of the present invention is to provide a computer readable storage medium, and a computer program stored thereon, which when executed by a processor, implements the method for calculating a torque demand of a driver of a hybrid powertrain system, and can accurately and efficiently calculate a torque demand of a driver of a powertrain system.
The third purpose of the invention is to provide a vehicle, which can realize the method for calculating the torque requirement of the driver of the light hybrid power system, can accurately and effectively calculate the torque requirement of the driver of the power system, meet the driving requirement of the driver and improve the control performance of the whole vehicle.
In order to realize the purpose, the following technical scheme is provided:
in a first aspect, the present invention provides a method for calculating a driver torque demand of a light hybrid powertrain system, comprising the steps of:
judging whether the power system has no fault;
if the power system has no fault, starting the engine;
judging whether the gear of the vehicle is a D gear or an R gear;
and if the gear of the vehicle is the D gear or the R gear, calling a driver torque demand calculation module and outputting a driver torque demand calculation result.
As a preferable scheme of the calculation method for the driver torque demand of the light hybrid power system, if the power system has a fault, the driver torque demand value is 0.
As a preferable aspect of the light hybrid system driver torque demand calculation method, if the vehicle gear is not the D gear and the vehicle gear is not the R gear, the driver torque demand is 0.
As a preferable scheme of the light hybrid power system driver torque demand calculation method, after the driver torque demand calculation module is called, before the driver torque demand calculation result is output, the method further comprises the following steps:
judging whether the gear of the vehicle is a D gear or not;
if the gear of the vehicle is the gear D, calling a torque demand calculation module of the driver under the gear D, and outputting a torque demand calculation result of the driver under the gear D;
and if the gear of the vehicle is not the D gear, calling a torque demand calculation module of the driver under the R gear, and outputting a torque demand calculation result of the driver under the R gear.
As a preferable scheme of the calculation method of the driver torque demand of the light hybrid power system, the calculation method of the D gear driver torque demand calculation module comprises the following steps:
when an accelerator pedal is depressed, a driver drive torque demand value F is obtained based on a two-dimensional MAP of an accelerator pedal opening s and a vehicle speed signal v1＝f1(s,v)；
Judging whether a brake pedal is stepped on;
if the brake pedal is not depressed, the driver's driving torque demand is F1Obtaining the driver torque demand value F ═ F of the wheel end1。
As a preferred scheme of the calculation method for the torque demand of the driver of the light hybrid power system, if a brake pedal is stepped on, a judgment module is called to simultaneously step on an accelerator and the brake pedal, and whether the opening degree s of the accelerator is larger than 0 is judged;
if the accelerator opening degree s is not more than 0, obtaining a driver braking torque demand value F based on a two-dimensional MAP of a brake pedal stroke position p and a vehicle speed signal v2＝f2(p, v) obtaining a driver torque demand value F ═ F for the wheel end2；
If the accelerator opening degree s is larger than 0, obtaining a driver driving torque demand value F based on a two-dimensional MAP (MAP of the accelerator opening degree s and the vehicle speed signal v)3＝f3(s, v) obtaining a driver torque demand value F ═ F for the wheel end3。
As a preferable scheme of the calculation method of the driver torque demand of the light hybrid power system, the calculation method of the driver torque demand calculation module under the R gear comprises the following steps:
when an accelerator pedal is depressed, a driver drive torque demand value F is obtained based on a two-dimensional MAP of an accelerator pedal opening s and a vehicle speed signal v1＝f1(s,v)；
Judging whether a brake pedal is stepped on;
if the brake pedal is not depressed, the driver's driving torque demand is F1Obtaining the driver torque demand value F ═ F of the wheel end1。
As a preferred scheme of the calculation method for the torque demand of the driver of the light hybrid power system, if a brake pedal is stepped on, a judgment module is called to simultaneously step on an accelerator and the brake pedal, and whether the opening degree s of the accelerator is larger than 0 is judged;
if the accelerator opening degree s is not more than 0, obtaining a driver braking torque demand value F based on a two-dimensional MAP of a brake pedal stroke position p and a vehicle speed signal v2＝f2(p, v) obtaining a driver torque demand value F ═ F for the wheel end2；
If the accelerator opening degree s is larger than 0, obtaining a driver driving torque demand value F based on a two-dimensional MAP (MAP of the accelerator opening degree s and the vehicle speed signal v)3＝f3(s, v) obtaining a driver torque demand value F ═ F for the wheel end3。
As a preferable aspect of the method for calculating the driver torque demand of the light hybrid system, the method further includes, after obtaining the driver torque demand value F at the wheel end, before outputting the result of the calculation of the driver torque demand:
obtaining an engine end torque demand T as F/(i eta) according to a driver torque demand value F of a wheel end, a gearbox speed ratio i and a transmission mechanism system efficiency eta;
filtering the engine end torque demand value T to obtain a smooth engine end torque demand value T1；
For a smoothed engine-end torque demand value T1Carrying out change rate limiting processing to limit the maximum slope in the rising process and the minimum slope in the falling process of the torque demand and obtaining a processed engine end driver torque demand value T2；
Invoking a torque distribution module according to the engine-end driver torque demand value T2Sending a torque distribution instruction to the engine and the motor;
the engine and the motor output power according to the torque distribution instruction, and the torque requirement of a driver is met.
In a second aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the light hybrid powertrain driver torque demand calculation method as described above.
In a third aspect, the present invention provides a vehicle comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the mild hybrid powertrain driver torque request calculation method as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for calculating the torque demand of a driver of a light hybrid power system, which comprises the following steps of firstly, judging whether a power system has no fault, and starting an engine if the power system has no fault; judging whether the gear of the vehicle is a D gear or an R gear; if the gear of the vehicle is the D gear or the R gear, a driver torque demand calculation module is called, and a driver torque demand calculation result is output.
The invention provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and the program is executed by a processor to realize the method for calculating the torque demand of the driver of the light hybrid power system, so that the torque demand of the driver of the power system can be accurately and effectively calculated.
The vehicle provided by the invention can realize the method for calculating the torque requirement of the driver of the light hybrid power system, can accurately and effectively calculate the torque requirement of the driver of the power system, meets the driving requirement of the driver and improves the control performance of the whole vehicle.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic diagram of a 48V light hybrid power system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for calculating a driver torque request for a 48V mild hybrid powertrain according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for calculating a driver torque request in D gear of a hybrid vehicle according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for calculating a torque demand at an engine end of a 48V mild hybrid vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
Example one
For convenience of describing the method for calculating the driver torque demand of the light hybrid power system provided by the embodiment, the light hybrid vehicle power system with 48V is combined for explanation. As shown in fig. 1, the 48V light-hybrid Vehicle power System mainly includes an Engine, a BSG Motor (Belt-driven Generator/Generator, BSG Motor for short), a 48V Battery, a DCDC (Direct Current to Direct Current Converter, DCDC Converter for short), a transmission, a clutch, and other assembly components, and controls the assembly through a corresponding Control Unit, a Motor Control Unit MCU (MCU for short) controls the BSG Motor, a Battery Management System BMS (BMS for short) controls the 48V Battery, an Engine Management System EMS (Engine Management System) controls the Engine, and a Vehicle Control Unit VCU (VCU) serves as an electric Control core Unit to coordinate and Control the torque demand calculation and output of the Vehicle power System.
The BSG motor is connected with the engine through a belt wheel train in a transmission mode, the BSG motor is used as a starting and power generation integrated machine and can provide power assistance to drive a vehicle together with the engine, the engine is controlled by an EMS (energy management system), the BSG motor is controlled by an MCU (micro control unit), a 48V battery is controlled by a BMS (battery management system), and the torque output of a power system of the whole vehicle is coordinated and controlled based on the acceleration and braking requests of a driver so as to meet the driving requirements of a user. The sensors of the accelerator pedal and the brake pedal are connected with the VCU through electric hard lines, the VCU analyzes an opening signal of the accelerator pedal according to the input of the sensor of the accelerator pedal, and the VCU analyzes a travel position signal of the brake switch and the brake pedal according to the input of the sensor of the brake pedal.
The VCU is used as a whole vehicle control unit, and coordinates and controls each control unit to output power torque so as to drive the vehicle together. The embodiment provides a method for calculating the driver torque demand of a light hybrid power system, which comprises the following steps:
judging whether the power system has no fault;
if the power system has no fault, starting the engine;
judging whether the gear of the vehicle is a D gear or an R gear;
and if the gear of the vehicle is the D gear or the R gear, calling a driver torque demand calculation module and outputting a driver torque demand calculation result.
Preferably, if there is a fault in the powertrain, the driver torque request value is 0.
Preferably, if the vehicle gear is not the D gear and the vehicle gear is not the R gear, the driver torque demand is 0.
Further, after invoking the driver torque demand calculation module, before outputting the driver torque demand calculation result, the method further comprises: judging whether the gear of the vehicle is a D gear or not; if the gear of the vehicle is the gear D, calling a torque demand calculation module of the driver under the gear D, and outputting a torque demand calculation result of the driver under the gear D; and if the gear of the vehicle is not the D gear, calling a torque demand calculation module of the driver under the R gear, and outputting a torque demand calculation result of the driver under the R gear.
Illustratively, as shown in fig. 2, the present embodiment provides a method for calculating the driver torque demand of the 48V mild hybrid powertrain system, comprising the steps of:
s100, key Start. Specifically, the driver torque request calculation is initially identified by the power-up of the operating key. After the key Start is powered on, S200 is executed.
S200, the VCU judges whether a vehicle power system has no fault; if the vehicle power system has no fault, executing S300; if the vehicle power system has a fault, S301 is executed.
And S300, starting the engine by using the BSG motor. After the engine is started, S400 is executed.
S301, the driver torque demand is 0.
S400, the VCU judges whether the gear of the vehicle is a D gear or an R gear; if the vehicle gear is the D gear or the R gear, executing S500; if the vehicle gear is not the D gear or the R gear, S501 is executed.
S500, calling a driver torque demand calculation module; after invoking the driver torque request calculation module, S600 is performed.
S501, the driver torque demand is 0.
S600, the VCU judges whether the gear of the vehicle is a D gear; if the vehicle gear is the D gear, executing S700; if the vehicle shift position is not the D shift position, that is, the vehicle shift position is the R shift position, S701 is executed.
And S700, calling a D gear lower driver torque demand calculation module to calculate, and obtaining a driver torque demand calculation result.
And S701, calling a driver torque demand calculation module under the R gear to calculate, and obtaining a driver torque demand calculation result.
Preferably, as shown in FIG. 3, the calculation method of the D gear off-driver torque request calculation module includes the steps of:
when an accelerator pedal is depressed, a driver drive torque demand value F is obtained based on a two-dimensional MAP of an accelerator pedal opening s and a vehicle speed signal v1＝f1(s,v)；
Judging whether a brake pedal is stepped on;
if the brake pedal is not depressed, the driver's driving torque demand is F1Obtaining the driver torque demand value F ═ F of the wheel end1；
If the brake pedal is stepped on, calling an accelerator and the brake pedal to simultaneously step on a judgment module, and judging whether the accelerator opening s is larger than 0;
if the accelerator opening degree s is not greater than 0, that is, if s is 0, the driver braking torque demand F is obtained based on the two-dimensional MAP of the brake pedal stroke position p and the vehicle speed signal v2＝f2(p, v) obtaining a driver torque demand value F ═ F for the wheel end2；
If the accelerator opening degree s is larger than 0, obtaining a driver driving torque demand value F based on a two-dimensional MAP (MAP of the accelerator opening degree s and the vehicle speed signal v)3＝f3(s, v) obtaining a driver torque demand value F ═ F for the wheel end3。
Preferably, the calculation method of the R range driver torque demand calculation module includes the steps of:
when an accelerator pedal is depressed, a driver drive torque demand value F is obtained based on a two-dimensional MAP of an accelerator pedal opening s and a vehicle speed signal v1＝f1(s,v)；
Judging whether a brake pedal is stepped on;
if the brake pedal is not depressed, the driver's driving torque demand is F1Obtaining the driver torque demand value F ═ F of the wheel end1；
If the brake pedal is stepped on, calling an accelerator and the brake pedal to simultaneously step on a judgment module, and judging whether the accelerator opening s is larger than 0;
if the accelerator opening degree s is not more than 0, namely s is 0, the brake pedal stroke position p and the vehicle speed signal are used as the basisv two-dimensional MAP of the vehicle, obtaining a driver braking torque demand value F2＝f2(p, v) obtaining a driver torque demand value F ═ F for the wheel end2；
If the accelerator opening degree s is larger than 0, obtaining a driver driving torque demand value F based on a two-dimensional MAP (MAP of the accelerator opening degree s and the vehicle speed signal v)3＝f3(s, v) obtaining a driver torque demand value F ═ F for the wheel end3。
Note that if the driver engages R gear, the driver torque request calculation flow resembles D gear, where F1、F2And F3The two-dimensional MAP graph and the table look-up are needed to be calibrated again to obtain the two-dimensional MAP graph and the table look-up are needed to be calculated through the method. Meanwhile, the maximum speed in the R gear can be limited (can be calibrated, such as 40km/h), and the safe driving of the vehicle during the reverse gear is ensured.
In the process of calculating the torque of the driver, the method for analyzing the travel positions of the accelerator pedal, the brake switch and the brake pedal comprises the following steps:
(1) and analyzing an accelerator pedal, wherein the VCU is connected with an accelerator pedal position sensor signal, and analyzes the power torque request value of the driver through the accelerator pedal position signal, and the corresponding torque request value is gradually increased along with the increase of the accelerator pedal position value.
(2) And (3) analyzing the brake switch, connecting the VCU with a brake switch sensor signal, and when the VCU receives the trigger setting of the brake switch, determining that the brake pedal is stepped on by the driver, wherein the VCU controls the torque of each power source to be gradually reduced.
(3) The VCU analyzes the driver's braking request based on the brake pedal stroke position sensor signal, and as the brake pedal is gradually depressed, the driving torque demand gradually decreases and the braking torque demand gradually increases.
In the process of calculating the torque of the driver, if a brake pedal fault is encountered, the processing method of the abnormity comprises the following steps: if the brake pedal travel position signal is invalid and the brake switch is set, the VCU should assume that the brake pedal is fully depressed, at which time the brake travel position depth is set to 100% and the driver torque request is set to 0. If the brake pedal travel position signal is invalid and the brake switch is not set, the VCU considers that the brake pedal is not pressed, the brake travel position depth is set to 0% at the moment, and the torque demand of the driver is calculated according to the fact that the accelerator pedal of the driver is pressed.
In the process of calculating the torque of the driver, if the accelerator and the brake are simultaneously pressed, the coordination processing method between the accelerator and the brake is as follows: if the driver steps on the accelerator pedal first and then steps on the brake pedal, the VCU brakes according to the depth of the travel position of the brake pedal, and meanwhile, the torque output of the accelerator pedal is slowly reduced to 0 finally. If the driver steps on the brake pedal first and then the accelerator pedal, the VCU should perform the accelerator pedal torque output limitation based on the vehicle speed, and the vehicle exhibits torque output but limits the torque output value.
Further, obtaining the driver torque demand value F at the wheel end further includes, before outputting the driver torque demand calculation result:
obtaining an engine end torque demand T as F/(i eta) according to a driver torque demand value F of a wheel end, a gearbox speed ratio i and a transmission mechanism system efficiency eta;
filtering the engine end torque demand value T to obtain a smooth engine end torque demand value T1；
For a smoothed engine-end torque demand value T1Carrying out change rate limiting processing to limit the maximum slope in the rising process and the minimum slope in the falling process of the torque demand and obtaining a processed engine end driver torque demand value T2；
Invoking a torque distribution module according to the engine-end driver torque demand value T2Sending a torque distribution instruction to the engine and the motor;
the engine and the motor output power according to the torque distribution instruction, and the torque requirement of a driver is met.
Illustratively, as shown in fig. 4, the present embodiment provides a torque demand calculation method at the engine end of a 48V mild hybrid vehicle, the method comprising the steps of:
and S1, acquiring the driver torque demand value F of the wheel end.
S2, an engine-end torque request T is obtained based on the transmission ratio i and the transmission efficiency η.
And S3, invoking a torque filtering module to perform smoothing processing. Specifically, the engine-side torque demand value is filtered to obtain a smooth engine-side torque demand value T1。
And S4, invoking a torque change limiting module to perform anti-impact processing. Specifically, the smoothed engine-end torque demand value T is used1And carrying out change rate limiting processing, limiting the maximum gradient in the rising process and the minimum gradient in the falling process of the torque demand, and preventing vehicle impact.
S5, obtaining the processed engine end driver torque demand value T2。
S6, processing the engine end driver torque demand value T2And comparing the maximum bearable torque capacity of the transmission shaft, and taking a small value as the target torque of the torque distribution module.
And S7, invoking a torque distribution module to distribute the torque of the engine and the motor. Specifically, a torque distribution module is called, and a torque distribution instruction is sent to the engine and the BSG motor according to the target torque.
And S8, outputting power by the engine and the motor according to the torque distribution instruction to meet the torque demand of the driver.
The method for calculating the driver torque demand of the light hybrid vehicle can be applied to 48V light hybrid vehicles, fully considers the states of various power assemblies such as an engine, a BSG motor, a 48V battery and a gearbox according to the characteristics of a power system of the 48V light hybrid vehicle, considers the coordination relationship between the opening degree of an accelerator pedal and the travel position of a brake pedal and the abnormal condition of the brake pedal based on the opening degree of the accelerator pedal and the travel position of the brake pedal, considers the speed ratio of the gearbox and the efficiency of a transmission mechanism, calculates the driver torque demand, and provides a real and reliable source basis for torque distribution of a power source.
Example two
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of calculating a driver torque demand for a mild hybrid powertrain as provided by an embodiment of the present invention, the method comprising:
judging whether the power system has no fault;
if the power system has no fault, starting the engine;
judging whether the gear of the vehicle is a D gear or an R gear;
and if the gear of the vehicle is the D gear or the R gear, calling a driver torque demand calculation module and outputting a driver torque demand calculation result.
The computer storage media of the present embodiments may take any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
EXAMPLE III
The vehicle provided by the embodiment is represented in the form of a universal terminal. Components of the vehicle may include, but are not limited to: a vehicle body (not shown), one or more processors, a memory device, and a bus connecting the various system components (including the memory device and the processors).
A bus represents one or more of any of several types of bus structures, including a memory device bus or memory device controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Vehicles typically include a variety of computer system readable media. Such media may be any available media that is accessible by the vehicle and includes both volatile and nonvolatile media, removable and non-removable media.
The storage device may include a computer system readable medium in the form of volatile Memory, such as Random Access Memory (RAM) and/or cache Memory. The vehicle may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, the storage system may be used to read from and write to non-removable, nonvolatile magnetic media (not shown, but commonly referred to as a "hard drive"). Although not shown, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk such as a Compact disk Read-Only Memory (CD-ROM), Digital Video disk Read-Only Memory (DVD-ROM), or other optical media may be provided. In these cases, each drive may be connected to the bus by one or more data media interfaces. The memory device may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility having a set (at least one) of program modules may be stored, for example, in a storage device, such program modules including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination may comprise an implementation of a network environment. The program modules generally perform the functions and/or methodologies of the described embodiments of the invention.
The vehicle may also communicate with one or more external devices (e.g., keyboard, pointing terminal, display, etc.), with one or more terminals that enable a user to interact with the vehicle, and/or with any terminals (e.g., network card, modem, etc.) that enable the vehicle to communicate with one or more other computing terminals. Such communication may be through an input/output (I/O) interface. Also, the vehicle may communicate with one or more networks (e.g., a Local Area Network (LAN), Wide Area Network (WAN), and/or a public Network, such as the internet) via the Network adapter. The network adapter communicates with other modules of the vehicle via the bus. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the vehicle, including but not limited to: microcode, end drives, Redundant processors, external disk drive Arrays, RAID (Redundant Arrays of Independent Disks) systems, tape drives, and data backup storage systems, among others.
The processor executes programs stored in the storage device so as to execute various functional applications and data processing, for example, to realize the light hybrid power system driver torque demand calculation method provided by the embodiment of the invention, and the method comprises the following steps:
judging whether the power system has no fault;
if the power system has no fault, starting the engine;
judging whether the gear of the vehicle is a D gear or an R gear;
and if the gear of the vehicle is the D gear or the R gear, calling a driver torque demand calculation module and outputting a driver torque demand calculation result.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (8)

1. A method of calculating a driver torque request for a hybrid powertrain system, comprising the steps of:
judging whether the power system has no fault;
if the power system has no fault, starting the engine;
judging whether the gear of the vehicle is a D gear or an R gear;
if the gear of the vehicle is the D gear or the R gear, calling a driver torque demand calculation module and outputting a driver torque demand calculation result;
the calculation method of the driver torque demand calculation module includes the steps of:
when an accelerator pedal is depressed, a driver drive torque demand value F is obtained based on a two-dimensional MAP of an accelerator pedal opening s and a vehicle speed signal v1＝f1(s，v)；
Judging whether a brake pedal is stepped on;
if the brake pedal is not depressed, the driver's driving torque demand is F1Obtaining the driver torque demand value F ═ F of the wheel end1；
If the driver steps on the accelerator pedal first and then steps on the brake pedal, braking is carried out according to the travel position depth of the brake pedal, and meanwhile, the torque output of the accelerator pedal is slowly reduced to 0 finally;
if the driver steps on the brake pedal first and then steps on the accelerator pedal, the torque output of the accelerator pedal is limited according to the vehicle speed, and the vehicle shows that the torque is output, but the torque output value is limited.
2. The mild hybrid powertrain driver torque request calculation method of claim 1, wherein if the powertrain has a fault, the driver torque request value is 0; and/or
If the vehicle gear is not the D gear and the vehicle gear is not the R gear, the driver torque demand value is 0.
3. The mild hybrid powertrain driver torque request calculation method of claim 1, further comprising, after invoking the driver torque request calculation module, prior to outputting the driver torque request calculation result:
judging whether the gear of the vehicle is a D gear or not;
if the gear of the vehicle is the gear D, calling a torque demand calculation module of the driver under the gear D, and outputting a torque demand calculation result of the driver under the gear D;
and if the gear of the vehicle is not the D gear, calling a torque demand calculation module of the driver under the R gear, and outputting a torque demand calculation result of the driver under the R gear.
4. The method for calculating the driver torque demand of the mild hybrid power system according to claim 3, wherein a D gear is off, if a brake pedal is pressed, an accelerator and brake pedal are called to simultaneously press a judgment module, and whether an accelerator opening s is larger than 0 is judged;
if the accelerator opening degree s is not more than 0, obtaining a driver braking torque demand value F based on a two-dimensional MAP of a brake pedal stroke position p and a vehicle speed signal v2＝f2(p, v) obtaining a driver torque demand value F ═ F for the wheel end2；
If the accelerator opening degree s is larger than 0, obtaining a driver driving torque demand value F based on a two-dimensional MAP (MAP of the accelerator opening degree s and the vehicle speed signal v)3＝f3(s, v) obtaining a driver torque demand value F ═ F for the wheel end3。
5. The method for calculating the driver torque demand of the mild hybrid power system according to claim 3, wherein when the R gear is off, if the brake pedal is pressed, the accelerator and brake pedal are called to simultaneously press the judgment module, and whether the accelerator opening s is larger than 0 is judged;
if the accelerator opening degree s is not more than 0, obtaining a driver braking torque demand value F based on a two-dimensional MAP of a brake pedal stroke position p and a vehicle speed signal v2＝f2(p, v) obtaining a driver torque demand value F ═ F for the wheel end2；
If the accelerator opening degree s is larger than 0, obtaining a driver driving torque demand value F based on a two-dimensional MAP (MAP of the accelerator opening degree s and the vehicle speed signal v)3＝f3(s, v) obtaining a driver torque demand value F ═ for the wheel endF3。
6. The light hybrid powertrain driver torque demand calculation method of any one of claims 4-5, wherein obtaining the driver torque demand value F at the wheel end further includes, before outputting the driver torque demand calculation result:
obtaining an engine end torque demand T as F/(i eta) according to a driver torque demand value F of a wheel end, a gearbox speed ratio i and a transmission mechanism system efficiency eta;
filtering the engine end torque demand value T to obtain a smooth engine end torque demand value T1；
For a smoothed engine-end torque demand value T1Carrying out change rate limiting processing to limit the maximum slope in the rising process and the minimum slope in the falling process of the torque demand and obtaining a processed engine end driver torque demand value T2；
Invoking a torque distribution module according to the engine-end driver torque demand value T2Sending a torque distribution instruction to the engine and the motor;
the engine and the motor output power according to the torque distribution instruction, and the torque requirement of a driver is met.
7. A computer-readable storage medium, having stored thereon a computer program, wherein the program, when executed by a processor, implements a mild hybrid powertrain driver torque request calculation method as recited in any one of claims 1-6.
8. A vehicle, characterized in that the vehicle comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a mild hybrid powertrain driver torque request calculation method as recited in any of claims 1-6.
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