Estimation Method of Master Cylinder Hydraulic Pressure Based on Friction Model

A friction model and hydraulic pressure technology, applied in braking safety systems, vehicle components, brakes, etc., can solve problems such as friction modeling that needs further research, reduce identification test workload, improve failure safety, and the method is reasonable workable effect

Active Publication Date: 2022-02-18
TONGJI UNIV
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  • Abstract
  • Description
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Problems solved by technology

In summary, it is of great significance to develop the hydraulic pressure estimation of the master cylinder of the brake-by-wire system. In addition, the core difficulty of hydraulic pressure estimation, that is, the modeling of friction force needs to be further studied.

Method used

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  • Estimation Method of Master Cylinder Hydraulic Pressure Based on Friction Model
  • Estimation Method of Master Cylinder Hydraulic Pressure Based on Friction Model
  • Estimation Method of Master Cylinder Hydraulic Pressure Based on Friction Model

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Embodiment

[0031] The present invention relates to a method for estimating the hydraulic pressure of the main cylinder of the IEHB system based on a friction model. The main structure of the IEHB system used in this embodiment is as follows figure 1 shown, which includes:

[0032] Brake pedal unit: including the brake pedal 12 assembly, reflecting the driver's driving intention;

[0033] Active pressure building unit: including motor (permanent magnet synchronous motor 2 in this embodiment), worm gear and rack and pinion (reduction transmission mechanism 3 in this embodiment), used to convert the rotational torque of the motor into The translational thrust of the master cylinder is pushed to generate the corresponding brake fluid pressure;

[0034] Brake execution unit: including brake master cylinder 8, brake wheel cylinder 7, solenoid valve (normally open solenoid valve 5 in this embodiment), liquid storage tank 4 and hydraulic pipelines, used to drive the gear of the active pressure ...

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Abstract

The invention relates to a method for estimating hydraulic pressure of a master cylinder of an IEHB system based on a novel friction model, comprising the steps of: 1) establishing a dynamic equation of the IEHB system; 2) testing the friction force of the IEHB system; 3) according to the test result of the friction force Establish a new recursive friction model; 4) estimate the master cylinder hydraulic pressure according to the dynamic equation of the IEHB system obtained in step 1) and the new recursive friction model obtained in step 3). Compared with the prior art, the invention has the advantages of reducing the cost of the IEHB, improving safety and reliability, and the like.

Description

technical field [0001] The invention relates to the technical field of automobile brake-by-wire, in particular to a method for estimating hydraulic pressure of a master cylinder of an IEHB system based on a friction model. Background technique [0002] The Integrated Electro Hydraulic Braking (IEHB) system integrates the servo electric booster device with the master cylinder. While ensuring the overall compact structure, it can quickly and accurately adjust the output through the joint hydraulic adjustment unit. brake pressure, and it is easier to integrate the above-mentioned new vehicle active safety functions. [0003] Since the IEHB system has the decoupling capability of the main and wheel cylinder hydraulic pressure and the active pressure building function, it can realize the maximum braking energy recovery of electric vehicles and the AEB (Autonomous emergency braking, automatic braking system) and ACC (Adaptive Braking System) of intelligent driving vehicles. cruis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T13/74B60T17/22
CPCB60T13/745B60T17/22
Inventor 史彪飞熊璐余卓平
Owner TONGJI UNIV
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