阅读说明：本技术 一种汽车换挡控制方法和换挡系统 (Automobile gear shifting control method and gear shifting system ) 是由 张宁波 于 2021-09-07 设计创作，主要内容包括：本发明揭示了一种汽车换挡控制方法,汽车档位设有P档、N档、D档、R档,车辆处于静止状态,执行静止状态档位控制方法；车辆处于运动状态,执行运动状态档位控制方法.本发明换挡逻辑更加合理,使用过程中,让驾乘感受更好,并且安全可靠。(The invention discloses an automobile gear shifting control method, wherein an automobile gear is provided with a P gear, an N gear, a D gear and an R gear, and a static state gear control method is executed when a vehicle is in a static state; the invention has more reasonable gear shifting logic, better driving feeling in the using process and safety and reliability.)

1. A vehicle gear shifting control method is characterized in that a vehicle gear is provided with a P gear, an N gear, a D gear and an R gear, and the method comprises the following steps: when the vehicle is in a static state, executing a static state gear control method;

when the gear is in the P gear, the gear D is entered under the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

when in the R gear;

entering the N gear according to the following conditions: no P gear request, no gun inserting signal, high voltage state of the vehicle and gear shift to N gear position;

entering the N gear according to the following conditions: no P gear request, no gun inserting signal, brake treading and gear position to N gear position;

entering the N gear according to the following conditions: the gear is in a position of N gear when no P gear request, no gun inserting signal, brake treading, and the vehicle is not in a high-voltage state;

entering the D gear according to the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

entering the P gear according to the following conditions: a P gear request or high pressure of the vehicle or a gun inserting signal is provided;

when in the N gear:

entering the D gear according to the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

the following conditions are met to enter the R gear: the gear is switched to the R gear position without P gear request, gun inserting signal and high-voltage state of the vehicle;

entering the P gear according to the following conditions: a P gear request or high pressure of the vehicle or a gun inserting signal is provided;

when in the D gear:

entering the N gear according to the following conditions: the gear is switched to the N gear position without P gear request, gun inserting signal and high voltage state of the vehicle;

the following conditions are met to enter the R gear: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to the R gear position;

entering the P gear according to the following conditions: there is a P-range request or a high vehicle pressure or a gun insertion signal.

2. The vehicle shift control method according to claim 1, characterized in that: when the vehicle is in a motion state, executing a motion state gear control method;

when in the R gear;

entering an N gear when the following conditions are met, switching the gear to an N gear position, or lowering high pressure of a vehicle, or switching the vehicle speed to the N gear position when the vehicle speed is less than-5 km/h;

entering a D gear when the vehicle speed is more than-5 km/h and stepping on a brake, and switching the gear to a D gear position;

when in the N gear;

the vehicle enters the R gear when meeting the following conditions, the vehicle is in a high-pressure state, the vehicle speed is less than 5km/h, a brake is stepped on, and the gear is switched to the R gear position;

the vehicle enters the D gear under the following conditions that the vehicle is in a high-voltage state, the vehicle speed is more than-5 km/h, a brake is stepped on, and the gear is switched to the D gear position;

when in the D gear;

entering the N gear when the conditions that the gear is switched to the N gear position, or the vehicle runs at high pressure or the vehicle speed is more than 5km/h and the gear is switched to the N gear position are met

The vehicle enters the R gear when the vehicle speed is less than 5km/h, the brake is stepped on, and the gear is switched to the R gear position.

3. The vehicle shift control method according to claim 1 or 2, characterized in that: and considering the vehicle to be in a static state when the vehicle speed is in the range of-2 km/h < V <2km/h, and considering the vehicle to be in a moving state if the vehicle speed is not in the range of-2 km/h < V <2 km/h.

4. The vehicle shift control method according to claim 3, characterized in that: when the vehicle is in a forbidden state, if a gun inserting signal is detected, the P gear is automatically locked through the VCU.

5. The vehicle shift control method according to claim 1, characterized in that: when the vehicle is in a moving state, a gun inserting signal is detected, the original gear is kept unchanged, and a P gear request is not responded.

6. The vehicle shift control method according to claim 1, characterized in that: if the VCU is restarted, if the vehicle is in a static state, the default gear is the P gear; if the vehicle is in motion, the default gear is N gear.

7. A vehicle gear shifting system comprises a VCU and a gear shifter connected with the VCU, wherein the gear shifter outputs a gear signal to the VCU, the VCU executes a gear command, the VCU is connected with a CAN bus to obtain a vehicle speed signal, a brake pedal signal and a parking signal, and the vehicle gear shifting system executes the control method according to any one of claims 1-6.

8. The vehicle shift system according to claim 7, wherein: the automobile is an electric automobile, and the VCU is connected with the CAN bus to acquire a gun inserting signal.

Technical Field

The invention relates to the technical field of gear management control of pure electric vehicles, in particular to a control strategy technology for transmitting signals between a VCU and a gear device.

Background

In the electric automobile, a vehicle control unit VCU is a core control component, is a regulation and control center of each subsystem of the electric automobile, coordinates and manages the running state of the whole automobile, and calculates parameters such as motor output torque and the like required by running according to the operation intention of a driver such as the position of an accelerator pedal, a gear, the force of a brake pedal and the like and the charge state of a storage battery, so that the motion of each power component is coordinated, and the normal running of the electric automobile is guaranteed. In addition, higher energy efficiency can be achieved through service charging, recovery of braking energy, and the like.

At present, a shifter is of a three-gear five-gear type, the shifter and a VCU transmit signals through hard-wire connection, as shown in fig. 1, according to the position of the shifter and the working condition of the whole vehicle, it is determined which gear in P/R/N/D should be currently located, wherein the pin definition is as shown in fig. 2, the logical relationship of gear control is as shown in fig. 3, a gear shift lever is as shown in fig. 4, and is a knob type gear shift lever, and the current gear shift control method is only to switch according to the rotating gear of a driver, and is relatively poor in safety and intelligence.

Disclosure of Invention

The invention aims to solve the technical problem of realizing a safe, intelligent and reliable gear shifting control method.

In order to achieve the purpose, the invention adopts the technical scheme that: a vehicle gear shift control method, the vehicle gear has P gear, N gear, D gear, R gear, the vehicle is in the static state, carry out the gear control method of the static state;

when the gear is in the P gear, the gear D is entered under the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

when in the R gear;

entering the N gear according to the following conditions: no P gear request, no gun inserting signal, high voltage state of the vehicle and gear shift to N gear position;

entering the N gear according to the following conditions: no P gear request, no gun inserting signal, brake treading and gear position to N gear position;

entering the N gear according to the following conditions: the gear is in a position of N gear when no P gear request, no gun inserting signal, brake treading, and the vehicle is not in a high-voltage state;

entering the D gear according to the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

entering the P gear according to the following conditions: a P gear request or high pressure of the vehicle or a gun inserting signal is provided;

when in the N gear:

entering the D gear according to the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

the following conditions are met to enter the R gear: the gear is switched to the R gear position without P gear request, gun inserting signal and high-voltage state of the vehicle;

entering the P gear according to the following conditions: a P gear request or high pressure of the vehicle or a gun inserting signal is provided;

when in the D gear:

entering the N gear according to the following conditions: the gear is switched to the N gear position without P gear request, gun inserting signal and high voltage state of the vehicle;

the following conditions are met to enter the R gear: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to the R gear position;

entering the P gear according to the following conditions: there is a P-range request or a high vehicle pressure or a gun insertion signal.

When the vehicle is in a motion state, executing a motion state gear control method;

when in the R gear;

entering an N gear when the following conditions are met, switching the gear to an N gear position, or lowering high pressure of a vehicle, or switching the vehicle speed to the N gear position when the vehicle speed is less than-5 km/h;

entering a D gear when the vehicle speed is more than-5 km/h and stepping on a brake, and switching the gear to a D gear position;

when in the N gear;

the vehicle enters the R gear when meeting the following conditions, the vehicle is in a high-pressure state, the vehicle speed is less than 5km/h, a brake is stepped on, and the gear is switched to the R gear position;

the vehicle enters the D gear under the following conditions that the vehicle is in a high-voltage state, the vehicle speed is more than-5 km/h, a brake is stepped on, and the gear is switched to the D gear position;

when in the D gear;

entering the N gear when the conditions that the gear is switched to the N gear position, or the vehicle runs at high pressure or the vehicle speed is more than 5km/h and the gear is switched to the N gear position are met

The vehicle enters the R gear when the vehicle speed is less than 5km/h, the brake is stepped on, and the gear is switched to the R gear position.

And considering the vehicle to be in a static state when the vehicle speed is in the range of-2 km/h < V <2km/h, and considering the vehicle to be in a moving state if the vehicle speed is not in the range of-2 km/h < V <2 km/h.

When the vehicle is in a forbidden state, if a gun inserting signal is detected, the P gear is automatically locked through the VCU.

When the vehicle is in a moving state, a gun inserting signal is detected, the original gear is kept unchanged, and a P gear request is not responded.

If the VCU is restarted, if the vehicle is in a static state, the default gear is the P gear; if the vehicle is in motion, the default gear is N gear.

A gear shifting system of an automobile comprises a VCU and a gear shifter connected with the VCU, wherein the gear shifter outputs a gear signal to the VCU, the VCU executes a gear instruction, the VCU is connected with a CAN bus to acquire a vehicle speed signal, a brake pedal signal and a parking signal, and the gear shifting system of the automobile executes the control method.

The VCU is connected with the CAN bus to obtain a gun inserting signal.

The invention has more reasonable gear shifting logic, better driving feeling in the using process, safety and reliability.

Drawings

The following is a brief description of the contents of each figure in the description of the present invention:

FIG. 1 is a schematic view of a shifter and VCU connection;

FIG. 2 is a pin definition diagram;

FIG. 3 is a schematic diagram of logic states;

FIG. 4 is a schematic view of a shift knob;

FIGS. 5 and 6 are logic diagrams of a vehicle shift control method;

in FIG. 3, logic state 1 represents voltage 8V-16V, logic state 0 represents voltage OV-1.5V, and the output is defined.

Detailed Description

The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.

An automobile gear shifting system judges which gear in P/R/N/D should be currently located according to the position of a gear shifter and the working condition of the whole automobile; the gear shifter is of a three-gear five-position type, when the gear shifter works, the VCU is connected with the gear shifter, the gear shifter outputs gear signals to the VCU, the VCU executes gear instructions, and meanwhile the VCU is connected with the CAN bus to obtain vehicle speed signals, brake pedal signals, parking signals and gun insertion signals. The gear structure is shown in fig. 4, a knob type gear lever is adopted, a press knob is a P gear, the leftmost end is an R gear, the rightmost end is a D gear, a middle position is arranged between the D gear and the R gear, and two N gear positions are arranged between the middle position and the R gear and between the middle position and the D gear.

In operation, the stationary state is defined as that when the vehicle speed is in the range of-2 km/< V <2km/h, the vehicle is considered to be in the stationary state, the transition condition is as shown in 5, the vehicle is changed from the stationary state to the moving state, the gear switching relation of the moving state is carried out, and the vehicle only allows the switching between the P gear and the N gear under the non-high pressure state. When the vehicle is in a static state, a gun inserting signal is detected, and the P gear is automatically locked through the VCU

The definition of the motion state is that when the vehicle speed is not in the range of-2 km/h < V <2km/h, the vehicle is considered to be in the motion state, and the conversion condition is shown in the following graph. When the vehicle changes from the moving state to the static state, the gear switching relation of the static state is carried out. The vehicle speed can be calibrated by N-D, N-R, D-R and R-D. When the vehicle is moving, a gun inserting signal is detected, the original gear is kept unchanged (torque limit), and a P gear request is not responded.

The VCU is restarted, namely if the vehicle is in a static state, the default gear is the P gear; if the vehicle is in motion, the default gear is N gear.

The method for executing the gear shift control in the stationary state is shown in fig. 5, and specifically comprises the following steps:

when the gear is in the P gear, the gear D is entered under the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

when in the R gear;

entering the N gear according to the following conditions: no P gear request, no gun inserting signal, high voltage state of the vehicle and gear shift to N gear position;

entering the N gear according to the following conditions: no P gear request, no gun inserting signal, brake treading and gear position to N gear position;

entering the N gear according to the following conditions: the gear is in a position of N gear when no P gear request, no gun inserting signal, brake treading, and the vehicle is not in a high-voltage state;

entering the D gear according to the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

entering the P gear according to the following conditions: a P gear request or high pressure of the vehicle or a gun inserting signal is provided;

when in the N gear:

entering the D gear according to the following conditions: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to a D gear position;

the following conditions are met to enter the R gear: the gear is switched to the R gear position without P gear request, gun inserting signal and high-voltage state of the vehicle;

entering the P gear according to the following conditions: a P gear request or high pressure of the vehicle or a gun inserting signal is provided;

when in the D gear:

entering the N gear according to the following conditions: the gear is switched to the N gear position without P gear request, gun inserting signal and high voltage state of the vehicle;

the following conditions are met to enter the R gear: no P gear request, no gun inserting signal, high-voltage state of the vehicle, brake treading and gear shifting to the R gear position;

entering the P gear according to the following conditions: there is a P-range request or a high vehicle pressure or a gun insertion signal.

When the vehicle is in a moving state, a moving state gear control method is executed, as shown in fig. 6, and the specific control method comprises the following steps:

when in the R gear;

entering an N gear when the following conditions are met, switching the gear to an N gear position, or lowering high pressure of a vehicle, or switching the vehicle speed to the N gear position when the vehicle speed is less than-5 km/h;

entering a D gear when the vehicle speed is more than-5 km/h and stepping on a brake, and switching the gear to a D gear position;

when in the N gear;

the vehicle enters the R gear when meeting the following conditions, the vehicle is in a high-pressure state, the vehicle speed is less than 5km/h, a brake is stepped on, and the gear is switched to the R gear position;

the vehicle enters the D gear under the following conditions that the vehicle is in a high-voltage state, the vehicle speed is more than-5 km/h, a brake is stepped on, and the gear is switched to the D gear position;

when in the D gear;

entering the N gear when the conditions that the gear is switched to the N gear position, or the vehicle runs at high pressure or the vehicle speed is more than 5km/h and the gear is switched to the N gear position are met

The vehicle enters the R gear when the vehicle speed is less than 5km/h, the brake is stepped on, and the gear is switched to the R gear position.

The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.