Multi-cavity braking main cylinder system with pedal feeling simulator

Abstract

The invention relates to a vehicle braking system, in particular to a multi-chamber brake master cylinder system with a pedal feel simulator; comprising a brake pedal, a push rod one, a master cylinder block, an oil pot and a booster system; the The master cylinder includes a T-shaped piston, a first piston, and a second piston; the brake pedal is connected to the T-shaped piston through a push rod one, and the T-shaped piston and the first piston form a first chamber, and the second A piston and the second piston form a second chamber, and the second piston and the master cylinder form a third chamber; a baffle is arranged between the T-shaped piston and the master cylinder, and the T-shaped baffle and the T-shaped The piston forms a pressurized chamber, and the pressurized chamber is connected with the pressurized system; the oil pot is respectively connected with the first chamber and the second chamber; the effective cross-sectional area of ​​the T-shaped piston is smaller than the effective cross-sectional area of ​​the first piston. cross-sectional area; this system improves the pressure control accuracy of the master cylinder, reduces pressure fluctuations in the brake master cylinder during active boosting, makes the braking force smoother, and improves the user's driving experience.

Description

technical field [0001] The invention relates to a vehicle brake system, in particular to a multi-chamber brake master cylinder system with a pedal feel simulator. Background technique [0002] At present, the brake-by-wire master cylinder system has a complex structure and high cost. And when the pressure is actively built, due to valve precision and control precision, etc., the pressure of the master cylinder fluctuates greatly, which in turn causes the braking force to fluctuate greatly, which seriously affects the driving experience of the user. [0003] Pedal simulators generally use a spring plus piston type, and the braking force is simulated through spring force feedback, which is not direct enough. Since the force-displacement curve of the brake is nonlinear, and different vehicles have different force-displacement curves, it is necessary to design different spring parameters, which requires a lot of work and high cost. Contents of the invention [0004] In order...

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Problems solved by technology

[0004] In order to solve the problem that the structure of the existing vehicle brake-by-wire master cylinder is complex and the cost is relatively high, and when the pressure is actively built, the pressure of the master cylinder fluctuates greatly due to reasons such as valve accuracy and control accuracy, which in turn leads to relatively large fluctuations in the braking force. It is a big problem, and the existing pedal simulators generally use the spring plus piston type to simulate the braking force through the spring force feedback, which is not direct enough; because the force-displacement curve of the brake is nonlinear, and different vehicles, the force- Displacement curves are also different, so different

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