Double-cylinder braking master cylinder system provided with pedal sensing simulator

Abstract

The invention relates to a dual-cylinder brake master cylinder system with a pedal feeling simulator; it includes a brake pedal, a push rod one, a booster cylinder block, a conventional master cylinder block, a booster system and an oil pot; A T-shaped piston and a first piston are arranged in the booster cylinder body, and the push rod one is connected with the T-shaped piston, and a booster cylinder cavity is formed between the T-shaped piston and the first piston; A baffle plate is arranged between the T-shaped piston of the T-shaped piston and the booster cylinder body, and a booster cylinder booster cavity is formed between the T-shaped head of the T-shaped piston and the booster cylinder wall, and the booster cylinder booster cavity is connected with the booster cylinder wall. The supercharging system is connected; the second piston and the third piston are arranged in the conventional master cylinder body, and the push rod 2 is arranged on the first piston, and the push rod 2 passes through the booster cylinder body It is connected with the second piston; the effective cross-sectional area of ​​the T-shaped piston is smaller than the effective cross-sectional area of ​​the first piston; this system improves the pressure control accuracy of the master cylinder and reduces the pressure fluctuation of the brake master cylinder during active boosting.

Description

technical field [0001] The invention relates to a vehicle brake system, in particular to a dual-cylinder brake master cylinder system with a pedal feeling simulator. Background technique [0002] At present, the structure of the brake-by-wire master cylinder system is complex and the cost is high; and when the pressure is actively built, due to the valve accuracy and control accuracy, the pressure of the master cylinder fluctuates greatly, which in turn causes the braking force to fluctuate greatly, which seriously affects the user driving experience. [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 or...

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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 spring parameters need to be designed, the workload is large, and the cost is high. The invention provides a dual-cylinder brake master cylinder system with a pedal feel simulator. The system improves the master cylinder 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

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