An electric vehicle hierarchical drive control system and control method

Abstract

The application relates to a kind of electric vehicle hierarchical drive control systems and control method.Control system's instrument display module can obtain opening drive hierarchical mode and driving mode and send to operation module;Operation module can receive the information input by instrument information module and other corresponding information, carry out Tipin enable processing, torque calculation and timing processing, after entering hierarchical drive mode, mode information is fed back to instrument display module through CAN line to display;Torque query module is used to store all torque maps, can query different map torque values according to the demand of operation module, and the query result is fed back to operation module.The control method of the application can realize hierarchical drive experience in the driving process and enrich electric vehicle driving mode by combining the driving mode information and driving mode information selected by the driver, the accelerator pedal opening degree information, the vehicle speed information and the ABS activation information through hierarchical drive control system analysis and calculation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric vehicles, and particularly relates to an electric vehicle hierarchical driving control system and a control method. BACKGROUND

[0002] With the further development of domestic electric vehicles, major manufacturers and new car enterprises increase the efforts to research and develop electric vehicles. From the proportion of vehicle sales, the market share of electric vehicles is becoming larger and larger. At present, pure electric vehicles are mainly driven by single motor and single-stage reducer. The torque response speed of the motor is large, and the speed interval is large. Stable throttle acceleration, the whole vehicle performance is that the acceleration is large in the first half, and the acceleration will become small after the motor base point. Although single motor and single-stage reducer driving can reduce the complexity of hardware to a certain extent, compared with traditional vehicles and multi-stage reducers, there is no gear change experience, and the driving pleasure of the vehicle is reduced to a certain extent and dimension. SUMMARY

[0003] The purpose of the application is to provide an electric vehicle hierarchical driving control system and control method which can simulate gear shifting, so as to solve the problem that single motor and single-stage reducer cannot realize gear shifting, and to realize gear shifting experience similar to traditional vehicles under some specific working conditions.

[0004] The purpose of the application is achieved by the following technical scheme:

[0005] An electric vehicle hierarchical driving control system comprises an operation module, which is electrically connected with an instrument display module and a torque query module.

[0006] The instrument display module can obtain the opening driving hierarchical mode and driving mode and send them to the operation module.

[0007] The operation module can receive information input by the instrument information module, vehicle speed information, accelerator pedal information, ABS function activation information, and information of activation flags of crawling function, vehicle speed limit, and torque limit, and can perform Tipin enabling processing, torque calculation, and timing processing on the corresponding information. After entering the hierarchical driving mode, the mode information is fed back to the instrument display module through the CAN line for display.

[0008] The torque query module is used for storing all torque maps, can query different map torque values according to the demand of the operation module, and feed back the query results to the operation module.

[0009] Further, the torque map includes a Lower torque map 1, a Normal torque map 1, a Higher torque map 1, a Tipin torque threshold map 1, a Lower torque map 2, a Normal torque map 2, a Higher torque map 2, and a Tipin torque threshold map 2.

[0010] A control method of a hierarchical drive control system of an electric vehicle, comprising the following steps:

[0011] A, the input instrument information module acquires the opening of the drive hierarchical mode and the driving mode and sends to the operation module;

[0012] B, the operation module receives the information input by the instrument information module, at the same time, receives the vehicle speed information, the accelerator pedal information, the ABS function activation information and the crawling function, the vehicle speed limit, the torque limit activation flag information; the operation module carries out Tipin enabling processing, torque calculation and timing processing according to the input information; at the same time, the torque query module queries different map torque values in real time according to the demand of the operation module, and feeds back the query results to the operation module;

[0013] C, after the operation module processes the input information, it enters the hierarchical drive mode, and feeds back the mode information to the instrument display module through CAN line for display.

[0014] Further, step A, the opening of the drive hierarchical mode and the selection of the driving mode can be a physical switch or a virtual switch, the drive hierarchical mode has only opening and closing options, the driving mode is set to be a comfortable mode and a sports mode, and an economic mode can also be added.

[0015] Further, step B, the Tipin enabling processing process, specifically: comparing the torque values before and after the pedal changes, comparing the torque values after the pedal changes with the lookup table values of Tipin torque threshold map 1 or Tipin torque threshold map 2, monitoring the crawling function, the vehicle speed limit, the torque limit flag and monitoring the ABS function activation information, and comprehensively judging the output Tipin enabling flag.

[0016] Further, the torque value T1 after the pedal changes is greater than the torque value T0 before the pedal changes, and the torque value T1 after the pedal changes is greater than the lookup table value of the Tipin torque threshold map1 or the Tipin torque threshold map2, and a flag a is set; otherwise, the flag a is reset; and the torque value T1 after the pedal changes is less than the torque value T0 before the pedal changes, and any one of the creep function, the speed limit, the torque limit flag and the ABS monitoring function is set, and a flag b is set; when the flag a is set and the flag b is reset, a flag c is set; when the flag a is reset and the flag b is reset, the flag c maintains the flag information of the last period; and when the flag b is set, the flag c is reset.

[0017] Further, in step B, the torque calculation process is specifically detecting the torque change process, and when the torque after the pedal changes is greater than the torque before the pedal changes, the torque calculation is performed, and the calculated torque is compared with the lookup table torque value of the Normal torque map1 or the Normal torque map2, and a torque comparison result flag is output.

[0018] Further, when the torque T1 after the pedal changes is greater than the torque T0 before the pedal changes, the torque calculation T=T0+x×(T1-T0) is performed, wherein x is a change coefficient less than 1, and the calculated torque T is compared with the lookup table torque of the Normal torque map1 or the Normal torque map2, and when the torque changes from T1 to T, a torque comparison result flag d is set; and when the flag c and the flag d are both set, a timing start flag e is set.

[0019] Further, in step B, the timing process is specifically that, after the flag c and the flag d are both set, the timing accumulation calculation is performed every other sampling period, and the timing result is compared with the calibration gear shifting process time, when the timing result is less than or equal to the gear shifting process time, the torque is output as the lookup table value of the Lower torque map1 or the Lower torque map2, and when the timing result is greater than the gear shifting process time, the torque is output as the lookup table value of the Higher torque map1 or the Higher torque map2.

[0020] Further, the timing process is that, after the flag e is set, the timing accumulation calculation is performed every other sampling period, and the timing result t1 is compared with the calibration gear shifting process time t, when t1 is less than or equal to t, the torque is output as the lookup table value of the Lower torque map1 or the Lower torque map2, and when t1 is greater than t, the torque is output as the lookup table value of the Higher torque map1 or the Higher torque map2.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] The electric vehicle hierarchical driving control system and control method can realize hierarchical driving experience in the driving process, and enrich the electric vehicle driving mode, by the driving hierarchical mode information and driving mode information selected by the driver, in combination with the accelerator pedal opening degree information, vehicle speed information and ABS activation information of the driver, through hierarchical driving control system analysis and calculation. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0024] Figure 1 The information interaction block diagram of the electric vehicle hierarchical driving control system. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the embodiments:

[0026] The electric vehicle hierarchical driving control system comprises an operation module, which is electrically connected with an instrument display module and a torque query module.

[0027] The instrument display module can obtain the opening driving hierarchical mode and driving mode and send them to the operation module.

[0028] The operation module can receive the information input by the instrument information module, as well as the vehicle speed information, accelerator pedal information, ABS function activation information, and the information of the creep function, vehicle speed limit, and torque limit activation flag. The operation module can perform Tipin enable processing, torque calculation, and timing processing on the corresponding information. After entering the hierarchical driving mode, the mode information is fed back to the instrument display module through the CAN line for display.

[0029] The torque query can set Lower torque map1, Normal torque map1, Higher torque map1, Tipin torque threshold map1, Lower torque map2, Normal torque map2, Higher torque map2, and Tipin torque threshold map2.

[0030] As shown in the control method of the electric vehicle hierarchical driving control system, the following steps are included: Figure 1

[0031] ​1. The instrument information input module acquires the start driving hierarchical mode and driving mode and sends them to the operation module.

[0032] 2. The operation module receives the information input by the instrument information module, receives the vehicle speed information, accelerator pedal information, ABS function activation information, and the creep function, vehicle speed limit, and torque limit activation flag information, and performs Tipin enabling processing, torque calculation, and timing processing on the corresponding information.

[0033] Among them, the Tipin enabling processing function needs to compare the torque values before and after the pedal changes, compare the torque values after the pedal changes with the lookup table values of Tipin torque threshold map1 or Tipin torque threshold map2, monitor the creep function, vehicle speed limit, torque limit flag, and monitor the ABS function activation information, and output the Tipin enabling flag based on the comprehensive judgment.

[0034] The torque calculation function detects the torque change process. When the torque after the pedal changes is greater than the torque before the pedal changes, the function will calculate the torque, and compare the calculated torque with the lookup table torque value of Normal torque map1 or Normal torque map2, and output the torque comparison result flag.

[0035] The timing function is to perform timing accumulation calculation every sampling period after the Tipin enabling flag and the torque comparison result flag are set at the same time. At the same time, the timing result is compared with the calibration amount shift process time. When the timing result is less than or equal to the shift process time, the torque output is the lookup table value of Lower torque map1 or Lower torque map2. When the timing result is greater than the shift process time, the torque output is the lookup table value of Higher torque map1 or Higher torque map2.

[0036] The operation module processes the corresponding input information, and after entering the hierarchical driving mode, the mode information is fed back to the instrument through the CAN line for display.

[0037] The torque query module stores Lower torque map1, Normal torque map1, Higher torque map1, Tipin torque threshold map1, Lower torque map2, Normal torque map2, Higher torque map2, and Tipin torque threshold map2. The lookup table information corresponding to driving mode 1 is torque map1, and the lookup table information corresponding to driving mode 2 is torque map2. The torque query module can query different map torque values according to the needs of the operation module, and feed back the query results to the operation module.

[0038] Example 1

[0039] The application discloses a control method of a control system of a hierarchical drive of an electric vehicle, and an input instrument information module acquires an opening drive hierarchical mode and a driving mode and sends the opening drive hierarchical mode and the driving mode to an operation module. In the embodiment, the opening drive hierarchical mode and the driving mode can be physical switches or virtual switches. The drive hierarchical mode has only opening and closing options. The driving mode is set as a comfortable mode and a sports mode, and an economic mode can be added.

[0040] The operation module receives information input by the instrument information module, receives vehicle speed information, accelerator pedal information, ABS function activation information, and creep function, vehicle speed limitation, and torque limitation activation flag information.

[0041] The Tipin function is enabled, the torque value T1 after the pedal changes is greater than the torque value T0 before the pedal changes, the torque value T1 after the pedal changes is greater than the lookup table value of the Tipin torque threshold map1 or the Tipin torque threshold map2, a flag a is set, otherwise the flag a is reset. The torque value T1 after the pedal changes is less than the torque value T0 before the pedal changes, the creep function, the vehicle speed limitation, the torque limitation flag and the ABS function are monitored, and a flag b is set when any one of the conditions is set, otherwise the flag b is reset. When the flag a is set and the flag b is reset, a flag c is set. When the flag a is reset and the flag b is reset, the flag c is maintained as the flag information of the last period. When the flag b is set, the flag c is reset.

[0042] The torque calculation function detects a torque change process. When the torque T1 after the pedal changes is greater than the torque T0 before the pedal changes, the torque calculation function calculates the torque T=T0+x*(T1-T0) (wherein x is a change coefficient less than 1), compares the calculated torque T with the lookup table torque of the Normal torque map1 or the Normal torque map2, and sets a flag d when the torque changes from T1 to T. When the flag c and the flag d are set at the same time, a flag e is set.

[0043] The timing function is a flag e set. After the flag e is set, a timing accumulation calculation is performed every sampling period. Meanwhile, the timing result t1 is compared with a calibration quantity shift process time t. When t1 is less than or equal to t, the torque is output as the lookup table value of the Lower torque map1 or the Lower torque map2. When t1 is greater than t, the torque is output as the lookup table value of the Higher torque map1 or the Higher torque map2.

[0044] The torque query module can query different map torque values in real time according to the demand of the operation module, and feed back the query result to the operation module.

[0045] The operation module processes the corresponding input information, and after entering the hierarchical driving mode, mode information is fed back to the instrument display module through the CAN line for display.

[0046] It should be noted that the above only describes the preferred embodiments of the present application and the principles of the applied technology. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A control method of an electric vehicle hierarchical drive control system, characterized by, The method comprises the following steps: A. An instrument information module acquires an opening driving hierarchical mode and a driving mode and sends them to an operation module; B. The operation module receives information input by the instrument information module, simultaneously receives vehicle speed information, accelerator pedal information, ABS function activation information, and information of activation flags of the crawling function, vehicle speed limitation, and torque limitation; the operation module performs Tipin enabling processing, torque calculation, and timing processing on the input information; simultaneously, a torque query module queries different map torque values in real time according to the demand of the operation module and feeds back the query results to the operation module; The Tipin enabling processing process specifically comprises: comparing torque values before and after the pedal changes, comparing the torque value after the pedal changes with the lookup table value of the Tipin torque threshold map1 or the Tipin torque threshold map2, monitoring the crawling function, the vehicle speed limitation, the torque limitation flag, and monitoring the ABS function activation information, and comprehensively judging the output Tipin enabling flag c; The torque calculation processing process specifically comprises: detecting a torque change process, when the torque after the pedal changes is greater than the torque before the pedal changes, the function performs torque calculation, and compares the calculated torque with the lookup table torque value of the Normal torque map1 or the Normal torque map2, and outputs a torque comparison result flag d; When the torque T1 after the pedal changes is greater than the torque T0 before the pedal changes, torque calculation T = T0 + x × (T1 - T0) is performed, wherein x is a change coefficient less than 1, the calculated torque T is compared with the lookup table torque of the Normal torque map1 or the Normal torque map2, and when the torque changes from T1 to T, the torque comparison result flag d is output and set; The timing processing is a timing accumulation calculation performed every sampling period after the flag e is set, and the timing result t1 is compared with the calibration quantity shift process time t, when t1 is less than or equal to t, the lookup table value of the Lower torque map1 or the Lower torque map2 is output, and when t1 is greater than t, the lookup table value of the Higher torque map1 or the Higher torque map2 is output; C. After the operation module processes the input information, the hierarchical driving mode is entered, and mode information is fed back to the instrument display module through the CAN line for display.

2. The control method of the hierarchical drive control system for an electric vehicle according to claim 1, characterized by: Step A, the opening driving hierarchical mode and the selected driving mode are physical switches or virtual switches, the driving hierarchical mode has only opening and closing options, and the driving mode is set to the comfortable mode, the sporty mode, and the economic mode.

3. The control method of the hierarchical drive control system for an electric vehicle according to claim 2, characterized by: Step B, the torque value T1 after the pedal change is greater than the torque value T0 before the pedal change, and the torque value T1 after the pedal change is greater than the lookup table value of the Tipin torque threshold map1 or the Tipin torque threshold map2, and the flag a is set; otherwise, the flag a is reset; and the torque value T1 after the pedal change is less than the torque value T0 before the pedal change, the creep function, the speed limit, the torque limit flag, and the monitoring ABS function, and any one of them is set, and the flag b is set; when a is set and b is reset, the output Tipin enable flag c is set; when a is reset and b is reset, the output Tipin enable flag c maintains the flag information of the last period; when b is set, the output Tipin enable flag c is reset.

4. An electric vehicle fractional drive control system characterized by: The operation module is electrically connected with the instrument display module and the torque query module; The instrument display module can obtain the opening driving step mode and the driving mode and send them to the operation module; The operation module can receive the information input by the instrument information module, the vehicle speed information, the accelerator pedal information, the ABS function activation information, and the creep function, the speed limit, the torque limit activation flag information, and can perform Tipin enable processing, torque calculation, and timing processing on the corresponding information; after entering the step driving mode, the mode information is fed back to the instrument display module through the CAN line for display; The Tipin enable processing process specifically includes: comparing the torque values before and after the pedal change, comparing the torque value after the pedal change with the lookup table value of the Tipin torque threshold map1 or the Tipin torque threshold map2, monitoring the creep function, the speed limit, the torque limit flag, and the monitoring ABS function activation information, and comprehensively judging the output Tipin enable flag c; The torque calculation processing process specifically includes: detecting the torque change process, when the torque after the pedal change is greater than the torque before the pedal change, the torque calculation is performed, and the calculated torque is compared with the lookup table torque of the Normal torque map1 or the Normal torque map2, and the torque comparison result flag d is output; When the torque T1 after the pedal change is greater than the torque T0 before the pedal change, the torque calculation T=T0+x×(T1-T0) is performed, where x is a change coefficient less than 1, and the calculated torque T is compared with the lookup table torque of the Normal torque map1 or the Normal torque map2; when the torque changes from T1 to T, the torque comparison result flag d is set; when c and d are set at the same time, the timing start flag e is set; The timing processing is a timing accumulation calculation performed every sampling period after the flag e is set, and the timing result t1 is compared with the calibration gear shifting process time t; when t1 is less than or equal to t, the lookup table value of the Lower torque map1 or the Lower torque map2 is output; when t1 is greater than t, the lookup table value of the Higher torque map1 or the Higher torque map2 is output. The torque query module is used for storing all torque maps, capable of querying different map torque values according to the requirement of the operation module, and feeding back the query result to the operation module.

5. The electric vehicle fractional drive control system of claim 4, wherein: The torque maps include a Lower torque map 1, a Normal torque map 1, a Higher torque map 1, a Tipin torque threshold map 1, a Lower torque map 2, a Normal torque map 2, a Higher torque map 2 and a Tipin torque threshold map 2.

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