Traction Control System Using a Torque Sensor for Adaptive Engine Throttle Control 2010-01-0629
A patent pending engine control system with torque sensor feedback is described. Upon detecting a loss in traction by means of a torque sensor, engine torque is adjusted via throttle paving the way for improved traction and enhanced stability. The throttle is reduced to a calculated value using engine characteristics, the torque sensor measurement and non-slipping wheel speed information. The advantages of the powertrain torque sensing as opposed to speed sensing are demonstrated thru a case study of a RWD SUV with an open rear differential. Simulations are used to prove the concept while the bandwidths of a number of physical systems contributing to the overall response time are ignored. Therefore the data provided in this paper should be treated relatively comparing speed sensors versus torque sensors. There are a number of engine torque reduction methods faster than throttle control such as spark retard and fuel shutoff. Because of the readily available data of throttle-engine torque dynamics, throttle control method was chosen to demonstrate the torque sensor capabilities to mitigate loss of traction. The same exercise could similarly be applied to another engine torque reduction method provided that the associated data is available to take the corrective action when loss of traction is detected as demonstrated in the case study.