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Braking torque control method for hydraulic hybrid vehicle

A hybrid vehicle and braking torque technology, applied in the direction of brakes, brake components, vehicle parts, etc., can solve the problems of the engine and the hydraulic hybrid system braking system unable to work in coordination, and the braking kinetic energy recovery rate is not high, etc. Achieve good engineering practical value, high reliability, and the effect of improving recovery rate

Inactive Publication Date: 2011-02-16
XUZHOU CONSTR MACHINERY INST XUZHOU CONSTR MACHINERY GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a hydraulic hybrid vehicle braking torque control method, which solves the problem that the braking kinetic energy recovery rate of the hydraulic hybrid vehicle is not high, and the engine, hydraulic hybrid system and traditional braking system cannot work in harmony The problem

Method used

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  • Braking torque control method for hydraulic hybrid vehicle

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Experimental program
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Embodiment 1

[0022] Embodiment 1: the braking torque control method is as follows:

[0023] 1. According to the driver's operation behavior on the brake pedal, combined with the vehicle load signal collected in the current state, determine the target braking torque of the vehicle in the current state;

[0024] 2. Convert the downward angle of the brake pedal into the braking deceleration of the vehicle, refer to the downward acceleration of the brake pedal, that is, the angular acceleration of the pedal, and judge the braking mode of the vehicle in the current state; the braking mode of the hydraulic hybrid vehicle includes : ①light braking, ②moderate braking, ③emergency braking;

[0025] According to the current speed of the hydraulic pump motor, the working pressure of the hydraulic accumulator, and the efficiency curve of the hydraulic pump motor, calculate the maximum braking torque of the hydraulic pump motor corresponding to the current state;

[0026] 3. According to the braking mo...

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Abstract

The invention discloses a braking torque control method for a hydraulic hybrid vehicle, which belongs to a braking control method of a hybrid vehicle. A method for distributing the braking torque comprises the following steps: determining an expected drive torque of the entire vehicle under the current conditions according to the operation behavior of a driver on a braking pedal along with the speed condition and load state in the current state; judging the braking mode of the entire vehicle according to the downlink speed and acceleration of the braking pedal; reasonably distributing a braking torque proportional relationship among an engine, a hydraulic hybrid system and the conventional friction braking system; and determining an instruction signal of the friction braking system and a hydraulic regenerative braking system according to a hydraulic accumulator pressure signal and a rotation speed signal of a hydraulic pump motor. The braking torque control method reasonably coordinates the working relationship among the engine, the hydraulic hybrid system and the conventional braking system, and on the premise of ensuring safe braking, improves the recovery rate of the braking kinetic energy of the vehicle, and has relatively high reliability and high engineering practical value.

Description

technical field [0001] The invention relates to a braking control method of a hybrid electric vehicle, in particular to a braking torque control method of a hydraulic hybrid electric vehicle. Background technique [0002] With the rapid development of industrial technology worldwide, the problems of energy shortage and environmental pollution are becoming more and more serious. Hydraulic hybrid technology is considered to be one of the effective solutions to the energy crisis and environmental pollution problems. Compared with electric hybrid technology, hydraulic hybrid power uses different energy storage units and energy conversion devices, so its braking control strategy is different from that of electric hybrid power. Control strategies for powered vehicles are quite different. The hydraulic hybrid technology has high power density and high energy cycle efficiency, and can provide most of the braking torque during the braking process. The traditional friction braking sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/176B60T8/34B60T8/56
Inventor 孙辉杨力夫罗衍领景军清黄兴钱王治军肖刚王月行刘莹莹杨涛翟海燕李召平
Owner XUZHOU CONSTR MACHINERY INST XUZHOU CONSTR MACHINERY GRP
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