Patent ID: 6591667
Filing Date: 2003-07-15
Classification: F02D,Y02T

Abstract:
A method for determining a throttle leak flow rate in a fuel delivery system, the method comprising the steps of:determining an instantaneous throttle leak flow rate based on an estimated throttle flow rate and a measured total throttle flow rate; and adjusting a throttle leak flow rate based on the instantaneous throttle leak flow rate and an estimated throttle leak flow rate until the estimated throttle flow rate approximately equals the measured total throttle flow rate, wherein the throttle leak flow rate is adjusted by using a low pass filtering technique in accordance with the following expression: throttle_leak_flow_rate(K)=alpha*(instantaneous_throttle_leak_flow_rate)+(1-alpha)*throttle_leak_flow_rate (Kâˆ’1) where 0