阅读说明：本技术 一种基于纯电动客车系统的陡坡缓降控制方法 (Steep-slope slow-descent control method based on pure electric passenger car system ) 是由 王伟健 孙健 田伟 李江 唐文 顾红星 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种基于纯电动客车系统的陡坡缓降控制方法,步骤如下：步骤一：由车辆的驾驶意图信号输入给整车控制器,此时打开HDC开关,制动踏板和加速踏板信号为0％；步骤二：整车控制器接收到需求陡坡缓降的驾驶意图,通过接收电机控制器的反馈转速信号给定所需的制动扭矩力大小；步骤三：此时尾灯亮起来,仪表显示正在执行陡坡缓降,电机控制器在接收到整车控制器的需求扭矩后通过控制IGBT来控制电机给反向电制动力,车辆处于一个比较安全的车速。本发明基于纯电动客车系统的陡坡缓降控制方法通过电制动的方式减少了下坡时气制动给刹车蹄片带来的机械磨损。同时通过增加回馈电流,增大能量回收的能力。(The invention discloses a steep descent control method based on a pure electric bus system, which comprises the following steps of: the method comprises the following steps: the driving intention signal of the vehicle is input to the vehicle control unit, the HDC switch is turned on at the moment, and the signals of the brake pedal and the accelerator pedal are 0 percent; step two: the vehicle control unit receives a driving intention of requiring steep descent and gives a required braking torque force by receiving a feedback rotating speed signal of the motor controller; step three: at the moment, the tail lamp is on, the instrument displays that the steep descent is being executed, the motor controller controls the motor to supply reverse electric braking force by controlling the IGBT after receiving the required torque of the vehicle controller, and the vehicle is at a safer speed. The steep-slope slow descending control method based on the pure electric passenger car system reduces mechanical abrasion of brake shoes caused by pneumatic braking when a slope goes downhill in an electric braking mode. Meanwhile, the capacity of energy recovery is increased by increasing the feedback current.)

1. A steep descent control method based on a pure electric bus system is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: the driving intention signal of the vehicle is input to the vehicle control unit, the HDC switch is turned on at the moment, and the signals of the brake pedal and the accelerator pedal are 0 percent;

step two: the vehicle control unit receives a driving intention of requiring steep descent and gives a required braking torque force by receiving a feedback rotating speed signal of the motor controller;

step three: at the moment, the tail lamp is on, the instrument displays that the steep descent is being executed, the motor controller controls the motor to supply reverse electric braking force by controlling the IGBT after receiving the required torque of the vehicle controller, and the vehicle is at a safer speed.

2. The pure electric vehicle system-based steep descent control method according to claim 1, characterized in that: the vehicle speed was 20 KM/H.

3. The pure electric vehicle system-based steep descent control method according to claim 2, characterized in that: and comparing the calculated torque value with the maximum feedback torque force which can be supported by the motor and the axle at the current speed and the maximum feedback torque force which is received under the maximum charging capacity of the battery during feedback in a PID (proportion integration differentiation) regulation mode, and taking the minimum value of the three values as the value of the required torque.

The technical field is as follows:

the invention relates to a steep descent control method based on a pure electric bus system, and belongs to the technical field of electric automobiles.

Background art:

a steep descent control (HDC for short) system is a part of an intelligent auxiliary driving technology and belongs to the expansion of an electronic stability control (ESC for short) system of an automobile. At present, the method is mainly applied to some sports car markets, and passenger car enterprises use less. The working principle of the system is that the vehicle is kept to slide at a stable and safe speed by controlling an anti-lock braking system (ABS) and the anti-supporting force of an engine in the process of descending the vehicle (without adopting a brake pedal and an accelerator pedal) through an electronic control means.

At present, HDC is applied more in traditional vehicle types, but in the electric automobile market, especially in the passenger car and bus market, the technology of the steep descent is still blank. Many conventional vehicle braking systems are not adequately implemented in purely electric vehicles.

The invention content is as follows:

the invention provides a steep descent control method based on a pure electric bus system in order to solve the problems in the prior art.

The technical scheme adopted by the invention is as follows: a steep descent control method based on a pure electric bus system comprises the following steps:

the method comprises the following steps: the driving intention signal of the vehicle is input to the vehicle control unit, the HDC switch is turned on at the moment, and the signals of the brake pedal and the accelerator pedal are 0 percent;

step two: the vehicle control unit receives a driving intention of requiring steep descent and gives a required braking torque force by receiving a feedback rotating speed signal of the motor controller;

step three: at the moment, the tail lamp is on, the instrument displays that the steep descent is being executed, the motor controller controls the motor to supply reverse electric braking force by controlling the IGBT after receiving the required torque of the vehicle controller, and the vehicle is at a safer speed.

Further, the value of the vehicle speed is/.

Furthermore, the calculated torque value is compared with the maximum feedback torque force which can be supported by the motor and the axle at the current speed and the maximum feedback torque force which is received under the maximum charging capacity of the battery during feedback in a PID (proportion integration differentiation) adjusting mode, and the minimum value of the three is taken as the value of the required torque.

The invention has the following beneficial effects: the steep descent control method based on the pure electric passenger car system reduces mechanical abrasion to the brake shoes caused by air braking when the vehicle descends the slope in an electric braking mode, and increases the energy recovery capability by increasing the feedback current.

Description of the drawings:

fig. 1 is a schematic flow chart of a steep descent control method based on a pure electric vehicle system.

FIG. 2 is a graph of results for vehicle SOC based on the present invention.

Fig. 3 is a diagram of the current condition of a battery according to the present invention.

FIG. 4 is a graph of vehicle speed results based on the present invention.

Fig. 5 is a graph of the torque demand results based on the present invention.

The specific implementation mode is as follows:

the invention will be further described with reference to the accompanying drawings.

The invention relates to a steep descent control method based on a pure electric bus system, which comprises the following steps:

the method comprises the following steps: the driving intention signal of the vehicle is input to the vehicle control unit, the HDC switch is turned on at the moment, and the signals of the brake pedal and the accelerator pedal are 0 percent;

step two: the vehicle control unit receives a driving intention of requiring steep descent and gives a required braking torque force by receiving a feedback rotating speed signal of the motor controller;

step three: at the moment, the tail lamp is on, the instrument displays that the steep descent is being executed, and the motor controller controls the motor to supply reverse electric braking force by controlling the IGBT after receiving the required torque of the vehicle controller, so that the vehicle is ensured to be at a safer speed.

The invention relates to a steep descent control method based on a pure electric bus system, which comprises the following steps:

in the process of descending a steep slope, a driver does not need to operate a pedal, so that the operation steps of the driver are simplified, the feet of the driver are liberated under certain conditions, and the operation comfort is improved.

When the HDC function of the invention is tested, the SOC of the vehicle and the current of the battery are improved (the SOC is improved by 0.8 percent) and the feedback current is increased (the feedback is more than 50A in most of time), thus being beneficial to saving energy consumption and increasing the driving range in a mountain environment.

In the steep descent control method based on the pure electric bus system, the current speed and the set speed are calibrated in a PID (proportion integration differentiation) regulation mode to serve as a reference value, and finally the vehicle is enabled to stably run at the set speed.

In the test process of the invention, the result meets the requirement, the torque is stabilized at a value, and the vehicle speed is stabilized at 20KM/H, which meets the expectation of steep descent. The calculated torque value is compared with the maximum feedback torque force which can be supported by the motor and the axle under the current speed and the maximum feedback torque force which is accepted under the maximum charging capacity of the battery during feedback in a PID (proportion integration differentiation) adjusting mode, and the minimum value of the three is the value of the required torque

The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.