초록 ▼

A method of determining the continuity of solenoids in an electronic automatic transmission system wherein a controller is programmed to determine solenoid continuity by checking for the presence of an inductive “OFF”spike which results from an open circuit or a direct short to supply voltage from t

A method of determining the continuity of solenoids in an electronic automatic transmission system wherein a controller is programmed to determine solenoid continuity by checking for the presence of an inductive “OFF”spike which results from an open circuit or a direct short to supply voltage from the solenoid of the solenoid-actuated valves.

대표청구항 ▼

In a vehicle transmission including an input member, an output member, a torque converter assembly for transmitting torque between an engine and the input member, a gear assembly for changing the ratio of torque between the input member and output member, a plurality of frictional units to shift the

In a vehicle transmission including an input member, an output member, a torque converter assembly for transmitting torque between an engine and the input member, a gear assembly for changing the ratio of torque between the input member and output member, a plurality of frictional units to shift the gear assembly, at least one solenoid-actuated valve being actuated in response to the presence or absence of electrical power to the valve for directing fluid flow between a fluid source and at least one of the frictional units, input sensors providing input signals of predetermined conditions, a controller for processing the input signals and providing output signals to control the solenoid-actuated valves, a method of determining the electrical continuity of solenoids for solenoid-actuated valves in the vehicle transmission, said method comprising the steps of; checking whether at least one predetermined event is occurring; executing a solenoid test to determine the continuity of a plurality of solenoids based on the at least one predetermined event; determining whether a predetermined solenoid is under test; checking whether a torque converter in the transmission is being partially locked to the engine if a solenoid is under test; turning on the solenoid under test if the method is at the start of a partial lockup period for the torque converter; turning off the predetermined solenoid under test; determining whether a spike response was received by the controller; pointing to the next solenoid to be tested if a spike response was received by the controller; determining whether all of the solenoids of the solenoid-actuated valves were tested; and ending the test if all of the solenoids of the solenoid-actuated valves were tested, otherwise continuing the test for the next solenoid to be tested.