Multi-cavity braking main cylinder system with pedal feeling simulator

Abstract

The invention relates to a vehicle braking system, in particular to a multi-cavity braking main cylinder system with a pedal feeling simulator. The multi-cavity braking main cylinder system comprises a braking pedal, a first pushing rod, a main cylinder body, an oil pot and a pressurizing system. The main cylinder body comprises a T-shaped piston, a first piston and a second piston. The braking pedal is connected with the T-shaped piston through the first pushing rod. The T-shaped piston and the first piston form a first cavity. The first piston and the second piston form a second cavity. The second piston and the main cylinder body form a third cavity. A baffle is arranged between the T-shaped piston and the main cylinder body. The baffle and the T-shaped piston form a pressurizing cavity connected with the pressurizing system. The oil pot is connected with the first cavity and the second cavity. The effective cross sectional area of the T-shaped piston is smaller than that of the first piston. According to the multi-cavity braking main cylinder system, the controlling precision of main cylinder pressure is improved, pressure fluctuation of a braking main cylinder at the time of active pressurizing is reduced, braking force is made to be smoother, and the driving experience of a user is improved.

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...

AI Technical Summary

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 spring parameters need to be designed, the workload is large, and the cost is high. The invention provides a multi-chamber brake master cylinder system with a pedal feel simulator. The pressure control accuracy reduces the pressure fluctuation of the brake master cylinder during active boosting, reduces the fluctuation of the braking force, makes the braking force smoother, and improves the user's driving experience; the hydraulic direct-feeding pedal feeling simulator is adopted, and the original simulator has been removed. The spring directly feeds back the pedal braking force through the hydraulic pressure, and at the same time, it only needs to choose different push rod diameters to feedback different pedal feel

Images