Pneumatic electronic braking assistance system using high-speed valves

In order to satisfy the request of the driving assistance systems (DAS) for heavy duty vehicles, a high-speed valves based pneumatic electronic braking assistance system (PEBAS) is developed. A novel configuration of PEBAS is designed and its mathematical model is built by analyzing the operation of the air-flow inside the high-speed valve. Based on the model, a PWM (pulse width modulation) method is used to control the high-speed valves and its duty cycle is adjusted by a PI controller in order to track the desired braking pressure. The controller is optimized according to test results of the high-speed valves. Then, an HIL (Hardware in-the-Loop) platform is built to validate the performance of the system. Experiments show that the control error of the developed PEBAS is less than 5%.