Detroit Diesel Corporation

Donald Michael McDonald

Richard Michael Avery, Jr

Jeffery Scott Hawkins

Dennis Michael Letang

Ian Daniel McKenzie

Marleen F Thompson

John Edward Longnecker

David Lawrence Hasfjord

James A Gray

A real-time maintenance alert system and method for use in a heavy-duty truck having an engine controller with memory are provided. The system includes a sensor operative to indicate an engine condition from the group consisting of: oil filter restriction, air filter restriction, fuel filter restriction, oil level, and coolant reserve tank fluid level. Control logic at the engine controller processes the sensor signal to determine a real-time fault condition, when appropriate.

Maintenance alert system for heavy-duty trucks

An engine controller capable of operating in both a torque governing mode and a speed governing mode simultaneously, and a method of operation whereby speed governing may be enabled and disabled while simultaneously providing a valid speed request signal to the controller is disclosed. A speed governor signal having an enabled state and a disabled state is generated external to the controller and monitored by the speed governor. A speed request signal is simultaneously monitored by the speed governor. The speed governor is operative to control the speed of the engine proportional to the speed request signal while the speed governor signal is in the enabled state. The speed governor is disabled by setting the speed governor signal into the disabled state. A torque governor may also be operational within the controller. The torque governor monitors a torque request signal which it uses to control a torque generated by the engine.

Inhibit engine speed governor

Growing community of inventors

Howell, MI, United States of America

Donald Michael McDonald