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Pure electric vehicle pre-start control system and its pre-start method

A pure electric vehicle and control system technology, which is applied in the field of the control system for the pre-start of pure electric vehicles, can solve the problems such as the lack of universality of pure electric vehicles, and achieve the effects of being easy to implement, reducing mechanical wear, and reducing starting noise.

Active Publication Date: 2019-03-08
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent mainly suppresses the vibration of the vehicle by improving the performance of the motor, but it is only for a specific motor, and it is not universal for pure electric vehicles with different motors.

Method used

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  • Pure electric vehicle pre-start control system and its pre-start method
  • Pure electric vehicle pre-start control system and its pre-start method
  • Pure electric vehicle pre-start control system and its pre-start method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 Shown is the structural block diagram of the pure electric vehicle transmission system. Wherein the driving motor shaft is connected with the input gear through a spline, and the output flange is connected with the transmission cardan shaft of the universal joint. If there is a large gap between the gears, when the vehicle starts, the gears need to be fully meshed before the vehicle can be started, resulting in a slow start; and due to the different positions of the gears, it may cause toothing, causing wear and tear on the mechanical parts of the transmission system. Noise will increase.

[0037] The main reducer is the main part of the automobile transmission system to reduce the speed and increase the torque. For cars with longitudinal engines, the final drive also uses bevel gear transmission to change the direction of power. For example, when a car is running normally, the speed of the engine is usually around 2000 to 3000r / min. If such a high s...

Embodiment 2

[0063] Such as image 3 Shown is a pre-start method of a pure electric vehicle consistent with the embodiment of the present invention.

[0064] The pre-start means that before the vehicle starts, the vehicle controller judges whether the driver has the intention to start, and issues corresponding instructions to prepare the vehicle for starting.

[0065] Method of the present invention comprises the following steps:

[0066] Step 101, collect vehicle status information, and determine whether the pure electric vehicle is about to start.

[0067] Judging whether the pure electric vehicle is about to start includes the following steps:

[0068] Step a1, judging whether the whole vehicle is powered on with high voltage.

[0069] Step a3, judging whether the handbrake is put down.

[0070] Step a5, judging whether the vehicle speed is less than or equal to 0.

[0071] Step a7, judging whether the brake is triggered.

[0072] Step a9, judging whether the accelerator is trigge...

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Abstract

The invention provides a control system and pre-start method of a blade electric vehicle. The method comprises the steps that 1, the vehicle state information is collected; and 2, whether to take the pre-start strategy or not is determined according to the vehicle state information. A motor gives out a small calibrated torque before the vehicle starts, so that gears of a transmission system of the vehicle are all in an engaged state, various start patterns start according to the intention of a driver, and shaking caused by impact to the transmission system of the vehicle is reduced; and meanwhile, mechanical abrasion can be reduced, and start noise can be lowered. There is no need to change the structure of an existing vehicle or additionally arranging hardware equipment like sensors, and implementation is easy. Through the control method, the vehicle can start quickly and stably, and meanwhile, coasting during starting of the vehicle can also be avoided.

Description

technical field [0001] The invention relates to the field of pure electric vehicles, in particular to a control system for pre-starting of pure electric vehicles and a pre-starting method thereof. Background technique [0002] The publication number is CN 104071031, and the patent application titled "A Method for Suppressing Start-up Vibration of Pure Electric Vehicles", which appropriately increases the step size of the motor to respond to the expected torque of the vehicle, and at the same time increases the speed feedback link to the expectations of the vehicle. Torque is corrected. The speed feedback link consists of five parts: motor speed detection, low-pass filter, motor speed differential, inertial link, and output limiter. Through the speed feedback link, it is possible to estimate a torque that corrects the expected torque, improve the dynamic response process of the transmission system during power transmission, achieve the effect of suppressing starting vibratio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/20
CPCB60L15/20B60L15/2072B60L2240/421B60L2240/423Y02T10/72
Inventor 刘晓辉王宏宇徐亚美李可敬
Owner WEICHAI POWER CO LTD
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