METHOD FOR MONITORING USAGE UTILITIES OF ONBOARD DIAGNOSTIC SYSTEMS FOR TERMINAL HYBRID ELECTRIC VEHICLES

摘要

A method of monitoring an onboard diagnostic system for a plug-in hybrid electric vehicle, the method comprising: defining a usage level of use equal to a stored counter divided by a stored denominator; monitoring a vehicle on-vehicle status; to determine when the vehicle is turned on to define a driving cycle; an engine-on state of an internal combustion engine of the vehicle is monitored to determine when the internal combustion engine is being fueled during each drive cycle to provide an engine-on state; A period is measured on each drive cycle in which the vehicle is on after the engine is fueled, a time is measured on each drive cycle in which the vehicle is on and at a speed of zero km / h (0 mph) is operated after the B a period of time is measured on each drive cycle in which the vehicle is on and operating at a speed greater than a predetermined speed after the engine is fueled, the stored denominator incremented on each drive cycle to define a current denominator, if the vehicle has been on for a period of time greater than a predefined minimum total time criterion after fueling the internal combustion engine, the vehicle will maintain a predefined minimum idle speed criterion of zero km / km. h (0 mph) has been operated after the internal combustion engine is fueled, and the vehicle has been operated for a predetermined minimum time criterion for a long time at a speed greater than the predetermined speed after the internal combustion engine the stored counter is incremented on each drive cycle to define a current counter when the onboard diagnostic system successfully completes a diagnostic test; a current usage efficiency after each identified drive cycle is calculated by dividing the current counter by the current denominator when the stored counter is incremented during the drive cycle or by dividing the stored counter by the current denominator, if the stored counter has not been incremented during the drive cycle, the current usage efficiency is compared to a minimum lower utility limit to determine if the current usage utilization level is greater than the minimum usage floor lower limit or less than the minimum usage floor lower limit; andoperation of the internal combustion engine during the next engine-on cycle is maintained for a time sufficient to allow the on-board diagnostic system to complete a diagnostic test if the current usage level of use is less than the minimum low-utility floor level; the on-board diagnostic system successfully completes the diagnostic test to allow the stored counter to be incremented.