Stepping feeling simulator and electric booster in drive-by-wire hydraulic braking system

Abstract

The invention discloses a stepping feeling simulator and an electric booster in a drive-by-wire hydraulic braking system. The stepping feeling simulator comprises a shell, a first piston, a second piston, a first compression spring and a second compression spring. The shell comprises a first cavity and a second cavity, and the first cavity and the second cavity are coaxially arranged and sequentially connected. The first piston is arranged in the first cavity in a sliding mode, the second piston is arranged in the second cavity in a sliding mode, and the first piston and the second piston arecoaxially arranged. One end of the first piston is a connecting end used for connecting a braking pedal top rod, one end of the second piston is a pushing end used for pushing the braking main cylinder top rod, and the other end of the first piston and the other end of the second piston are close to each other and provided with a gap L. The first compression spring is arranged between the first piston and the second piston, and the second compression spring is arranged in the second cavity and used for supporting the second piston. The pretension force of the second compression spring is greater than that of the first compression spring, and the other end of the second piston abuts against the joint of the first cavity and the second cavity. The stepping feeling simulator improves the energy recovery and comfort.

Description

technical field [0001] The invention relates to the technical field of automobile braking equipment, in particular to a pedal feeling simulator and an electric booster in a wire-controlled hydraulic braking system. Background technique [0002] With the increasing control of emission requirements at home and abroad, new energy vehicles have gradually become a hot topic. Compared with traditional fuel vehicles, new energy vehicles not only have the advantages of high efficiency, less emissions, and low noise, but also use motor braking to realize energy recovery and reuse during braking, which effectively improves energy use efficiency. Therefore, new energy vehicles put forward higher requirements for the braking system. [0003] In response to the defects of the transmission braking system, a wire-controlled hydraulic braking system has gradually appeared on the market, that is, the motor assist is used to replace the vacuum assist of the transmission. [0004] However, t...

AI Technical Summary

Problems solved by technology

Due to the coupling between the brake pedal and the brake master cylinder, the braking energy cannot be recovered to the greatest extent during the braking process

Moreover, due to the rigid connection between the brake pedal and the brake master cylinder, when the brake pedal is stepped on, it will inevitably cause the brake master cylinder to build up pressure, resulting in a corresponding deceleration, resulting in the motor feedback braking force being directly superimposed on the original friction braking force Above, the original frictional braking force is not adjusted, the energy recovery rate is low, and the braking comfort is poor

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