Reliability in electromagnetic systems : The role of electrical contact resistance in maintaining automobile speed control system integrity

Electromagnetic systems depend upon the integrity of electrical connections. An intermittent speed sensor connection is shown to generate a false speed signal that may allow an automobile speed control system to engage at low speed and cause a sudden acceleration. Preventive measures are discussed. The current approach to controlling uncommanded sudden accelerations seems to rely upon the driver braking against full engine power to bring the vehicle to a halt. More effective and safer control would be achieved by cutting off the fuel supply the moment that an uncommanded wide open throttle condition was detected, thereby preventing the sudden acceleration.