Research on new automobile power hydraulic braking system by vibratory energy

Abstract

A new automobile power hydraulic braking system by vibratory energy is introduced which includes four vibration dampers, four energy accumulators, hydraulic booster, one storage tank, four wheel cylinders, four electromagnetic one-way valves, brake master cylinder, vacuum booster, brake pedal and loading sensing pressure proportioning valve(LSPV). Vibration damper is composed of nitrogen cavity, piston, piston rod, shell, rebound valve, compression valve, inlet tube, outlet tube and so on. Energy accumulator contains relief valve and oil return tube. The electromagnetic one-way valves are controlled by brake pedal. Hydraulic booster is composed of piston, pushrod, inlet valve, oil return valve and so on. The oil is circulated between storage tank, energy accumulator, vibration dampers and hydraulic components. Oil from storage tank enters into vibration dampers by compression valve when the suspension is compressed and leaves by rebound valve when stretched. When the oil is flowing between compression valve and rebound valve, frictional heat is produced which depletes vibratory energy and damps the vibration. The pressurized oil flows into energy accumulator and then enters into hydraulic booster and wheel cylinders. Power generated by hydraulic booster and applied loads on brake pedal by driver is applied to piton of master cylinder and pressurize the oil. Pressurized oil from master cylinder and energy accumulator enters into wheel cylinders help them to fulfill their function. Vibratory energy is converted to output power of hydraulic component. The oil returns storage tank after braking is finished. The braking system can recycle some vibratory energy and convert to hydraulic energy which is used for automobile power braking system. It can reduce brake pedal force, lower fatigue of drive, shorten retardation time of braking, and enhance safety of braking.