Application of Motor Load Emulation Techniques for EPB (Electric Parking Brake) System Tests 2024-01-2274
The EPB (Electric Parking Brake) system is divided into two parts based on VDA305-100 recommendation (German Association of the Automotive Industry, VDA). One part of the EPB system contains the parking brake actuator, caliper, and actuation logic (parking brake controller, PBC). The second part of the EPB system is called to the HOST which contains the EPB power electronics, necessary peripherals and controls the functions that the driver can experience.
According to VDA305-100, the PBC is responsible for recognition of a fault in the parking brake actuator based on the measured values transmitted from the HOST such as EPB motor voltage and current. Due to mechanical fault injection limitations, failsafe tests require physically electrical emulation caused by parking brake actuator faults to verify the parking brake actuator fault detection and management algorithm.
This paper introduces EPB motor load emulation techniques in which EPB HILS (Hardware in the Loop Simulation) test environment in real-time with simple DC (Direct Current) motor model and caliper model. The test environment can provide not only normal EPB actuation tests described in VDA305-100 recommendation but also dedicated failsafe tests of parking brake actuator stuck, stall, abnormal EPB actuation without a command from the HOST and abnormal EPB motor input voltage situation under various physically electrical emulation conditions.
