An Electro-hydraulic Braking System with Mechanical Failure Protection

Abstract

An electronic hydraulic brake system with a mechanical failure protective function for vehicles comprises a brake pedal, a pedal displacement sensor, a pedal simulator pressure sensor, a pedal simulator, a pedal simulator electromagnetic valve, a mechanical failure protective device, an electric linear moving module, a brake main cylinder and an ABS / ESC module. In a normal operating mode, a pin lock is separated with a pin lock sleeve; in a failure mode, the pin lock is locked with the pin lock sleeve. The electric linear moving module is use for accurately controlling brake pressure. The brake main cylinder is coupled with a vehicle wheel brake hydraulically through the ABS / ESC module. The ABS / ESC module can passively adjust the pressure of a wheel brake and can also adjust the pressure of one brake of each wheel. The system responds rapidly, accurately, controls the pressure of brake fluid, well simulates the sense of the brake pedal of a driver and recovers brake energy to the utmost extent; a failure protective mode is arranged, the brake pedal and the main cylinder are connected mechanically during failure, and the system has high safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of automobiles and relates to automobile braking technology, in particular to an electronic hydraulic braking system with mechanical failure protection. Background technique [0002] Since petroleum resources are non-renewable resources with limited storage, and the exhaust emissions of fuel vehicles are extremely harmful to the environment, the development of energy-saving and environmentally friendly electric vehicles has become an important direction for major automobile manufacturers. In urban conditions, the car will brake frequently, which will consume a large part of the car's energy. The electro-hydraulic braking system with mechanical failure protection proposed in this paper is used to recover the energy of the electric vehicle during braking. When the vehicle decelerates and brakes, the motor can be used to brake. Due to the lag of the motor during braking, the power supply is reversed to generat...

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Problems solved by technology

[0004] The accelerator pedal composite braking system uses the accelerator pedal as the source of the braking intervention signal of the drive motor. This system has minor changes to the original braking system and is easy to control. However, it does not conform to the driver's traditional brake pedal feeling and can be recycled. less energy

[0005] The non-decoupled compound braking system generally loads a certain idle stroke on the original brake booster parts. During this idle stroke, the drive motor provides regenerative braking force. After overcoming this idle stroke, the hydraulic brake intervenes. Regenerative braking provides the total braking force together. This compound braking system retains the mechanical connection between the pedal and the hydraulic system, which has high reliability and safety, but its recyclable braking energy is less, which is different from the traditional brake pedal feel. Deviated

[0006] The full decoupling compound braking system belongs to the electronic hydraulic braking system. Bosch's HAShev system and TRW's SCB system are both fully decoupled. The failure protection is divided into hydraulic failure protection and mechanical failure protection according to the degree of leakage of the hydraulic pipeline. , if there is a small leakage in the pipeline, it will be a hydraulic failure protection. If the pipeline leakage is serious, it will be a mechanical failure protection. At the same time, its master cylinder has changed a lot, usually by installing a high-pressure accumulator. The motor and pump actively control the brake input force of the hydraulic system, but the high-pressure accumulator technology is not yet mature, and there are still hidden dangers in reliability and safety. In addition, the addition of multiple solenoid valves also increases the difficulty and failure of control. risks of

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