Donald G Mcdonald

US Patent:

6371081, Apr 16, 2002

Filed:

Sep 29, 2000

Appl. No.:

09/675925

Inventors:

Jeffery Scott Hawkins - Farmington Hills MI
Donald Michael McDonald - Howell MI

Assignee:

Detroit Diesel Corporation - Detroit MI

International Classification:

F02D 4114

US Classification:

123352, 12333914, 701110

Abstract:

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.

US Patent:

RE39845, Sep 18, 2007

Filed:

Jun 10, 2002

Appl. No.:

10/167028

Inventors:

David Lawrence Hasfjord - Dearborn MI, US
Dennis Michael Letang - Canton MI, US
James A. Gray - Canton MI, US
Donald M. McDonald - Howell MI, US
Marleen F. Thompson - Sterling Heights MI, US
Ian Daniel McKenzie - Canton MI, US
John Edward Longnecker - Livonia MI, US

Assignee:

Detroit Diesel Corporation - Detroit MI

International Classification:

B60Q 1/00

US Classification:

340438, 340439, 340450, 3404502, 3404503, 340451, 3404574, 701 29, 701 30, 701 34

Abstract:

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.

US Patent:

54449367, Aug 29, 1995

Filed:

Aug 17, 1993

Appl. No.:

8/108068

Inventors:

Donald McDonald - Wixom MI

International Classification:

A01K 9100

US Classification:

43 4274

Abstract:

A trolling unit for fishing, including a weight release mechanism. The trolling unit includes a spreader to which two hooks may be attached. Once a fish takes the bait the weight release mechanism releases a weight which allows the fisherman to pull the fish to the surface without reeling in the weight with the fish.