Method for invoking a shutdown on default

In a transmission system including a transmission having a plurality of gears, a plurality of solenoid-operated valves for allowing shifting between the gears, and an electronic controller for controlling electrical power to the solenoid-actuated valves, a method of invoking a shutdown on default to disconnect power from the solenoid-actuated valves, said method comprising the steps of:

• defining temporary default gears to be allowed for operation of the transmission;
• monitoring predetermined variables of the transmission by the electronic controller;
• allowing shifting between temporary default gears;
• determining whether a fault has been detected based on the monitored predetermined variables;
• disconnecting electrical power to the solenoid-actuated valves by the electronic controller if a fault has been detected;
• determining whether faultless operation of the transmission has occurred for a predetermined time period by the electronic controller if a fault has not been detected;
• and
• allowing shifting between additional gears if faultless operation of the transmission has occurred for the predetermined time period.

In a transmission system including a transmission having a plurality of gears, a plurality of solenoid-operated valves for allowing shifting between the gears, and an electronic controller for controlling electrical power to the solenoid-actuated valves, a method of invoking a shutdown on default to disconnect power from the solenoid-actuated valves, said method comprising the steps of:

• defining temporary default gears to be allowed for operation of the transmission;
• monitoring predetermined variables of the transmission by the electronic controller;
• allowing shifting between temporary default gears;
• determining whether a fault has been detected based on the monitored predetermined variables;
• disconnecting electrical power to the solenoid-actuated valves by the electronic controller if a fault has been detected;
• determining whether faultless operation of the transmission has occurred for a first predetermined time period by the electronic controller if a fault has not been detected;
• determining whether a second predetermined time period has elapsed before said step of monitoring after a fault has been detected;
• disconnecting electrical power to the solenoid-actuated valves by the electronic controller if the second predetermined time period has not elapsed;
• and
• allowing shifting between additional gears if faultless operation of the transmission has occurred for the first predetermined time period.