Development of anti lift control for motorcycle 2018-32-0076
In Motorcycle market, customers demand the engine control for safe and fast riding. One of those, the Control for maximum acceleration performance without front tire lift(Anti lift control) is already on the market. We developed more accurate control.
In order to maximize the acceleration performance, it is necessary to keep the front lift angle as close as possible to zero. So after the front lift angle increased, the engine torque has to be reduced to keep the front lift angle to zero. But the unduly engine torque reduction cause the worse acceleration performance. Front lift Feedback control is effective to optimize engine torque. But if the feedback gain is increased to keep the front lift angle as close as possible to zero, the engine torque will oscillate and it will deteriorate the ride comfort. In order to solve this problem, we estimate the force balance of the front lift and use feedforward control to limit the engine torque. the actual pitching angular acceleration is appropriate parameter for this estimation to absorb error. But, pitching angular acceleration keeps to zero during no front lift, so we can’t estimate the force balance before front lift. Therefore, we adapted the open loop control calculated from the geometry of the vehicle until the front lift occur, and when front lift is detected, we switch to the feedforward control that uses the estimation by actual pitching angular acceleration.
By this method, we can control engine torque more accurately for the maximum acceleration performance by keeping the front lift angle close to zero.
Taiki Mase, Takashi Suzuki
Suzuki Motor Corp.
SAE/JSAE Small Engine Technology Conference