A vehicle's actual application conditions, such as startup, idle park, low speed or high speed driving, speed increase, speed decrease, climbing, and reversing are extremely complex. They require the vehicle's driving force and speed to change within a large range. The range of output torque and speed change produced by the piston engines that are widely adopted at present is smaller. In order to adapt to the constantly changing driving conditions and to enable the engine to work under favorable conditions (higher power with lower fuel consumption), a gearbox is added into the transmission system. The automobile gearbox is one of the highest-tech products among the components for a vehicle. One of its more crucial aspects is online testing, which aims to simulate the car's actual operating conditions while on the production line to test for transmission related indicators.