Patent ID: 6662780
Filing Date: 2003-12-16
Classification: F02D

Abstract:
A method for controlling a limp-home function in a vehicular electronic throttle system, comprising:detecting a malfunction of a throttle valve to determine whether the throttle valve has a problem of complete closure; determining whether a difference between a first output value set up as target by a throttle position sensor and a second output value measured by the throttle position sensor is greater than a first critical value and whether coolant temperature is larger than a reference value; determining whether an idle switch is turned on and whether engine revolution is less than a reference value; determining whether a reference period of time has lapsed and whether a third output value of the throttle position sensor has dropped below a second critical value and whether coolant temperature is higher than a reference value while the idle switch is turned on; and turning on a limp-home valve if at least one of the conditions in the above steps is met.