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Compound braking transition process control method

A compound braking and transition process technology, applied in electric braking systems, electric vehicles, transportation and packaging, etc., can solve problems such as low motor power generation efficiency, inability to reflect the actual effect of braking energy recovery strategies, and increased hydraulic braking force. , to achieve the effect of improving braking consistency, improving slow response speed and good control effect

Active Publication Date: 2019-03-01
TONGJI UNIV
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AI Technical Summary

Problems solved by technology

[0006] 3) When the braking demand remains unchanged, as the vehicle speed continues to decrease, when the motor speed decreases to the critical speed, the motor generates low efficiency and heats up seriously. The braking demand remains unchanged, and the hydraulic braking force increases sharply
Did not pay too much attention to the state of the impact during the entire braking process, resulting in the inability to reflect the actual effect of many braking energy recovery strategies

Method used

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  • Compound braking transition process control method

Examples

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Embodiment

[0032] The present invention relates to a control method of a compound braking transition process, which includes the following steps:

[0033] Step 1. Based on the vehicle model and compound braking system under study, analyze the vehicle parameters and motor parameters, and determine that the braking deceleration corresponding to the upper limit of the motor force is 0.1g.

[0034] Step 2: Determine the logic algorithm of the motor force correction module based on the vehicle information and the data from step 1:

[0035] The motor force correction logic is as figure 2 As shown, according to the state of the vehicle, if the braking demand is increasing and the braking deceleration is less than 0.1g, the hydraulic braking force is about to intervene to make the upper limit of the motor force distributed by the braking force lower than the maximum value, so that the hydraulic braking When the power is involved, the insufficient braking force due to the lag can be coordinated and com...

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Abstract

The invention relates to a compound braking transition process control method. To solve the problem that a motor braking subsystem and a hydraulic braking subsystem in a vehicle compound braking system have difference in response speed, motor braking force is used for directly compensating deviation between a hydraulic braking force requirement and actual hydraulic braking force, in addition, a motor force correction module is added, and thus a motor has compensation capacity under various transitional working conditions. Compared with the prior art, braking consistency of the motor under thehydraulic force intervention working condition is improved, and the impact degree in the compound braking transition process can be effectively reduced.

Description

Technical field [0001] The invention relates to the technical field of automobile compound braking, in particular to a method for controlling the transition process of compound braking. Background technique [0002] The composite braking system generally includes a motor braking subsystem and a hydraulic braking subsystem. The braking demand of an electric vehicle is jointly responded by the regenerative braking of the drive motor and the hydraulic braking system. Electronic hydraulic brake system (Electro-hydraulic Brake System, EHB) is a new type of brake-by-wire system with active boost function. It is the development trend of automobile hydraulic brake system. It has precise control of hydraulic brake force and is easy to implement. Outstanding advantages such as regenerative braking. [0003] When the vehicle is braking, the braking force distribution strategy prioritizes the use of electric mechanism power under the condition of ensuring braking safety, and applies hydraulic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/26
CPCB60L7/26
Inventor 熊璐史彪飞韩伟余卓平
Owner TONGJI UNIV
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