Inventors:
John P. Bilezikjian - Canton MI, US
Thomas J. Cusumano - Royal Oak MI, US
Valerie A. Nelson - Livonia MI, US
Ken J. Jackson - Dearborn MI, US
William S. Schwartz - Pleasant Ridge MI, US
Brian D. Rutkowski - Ypsilanti MI, US
International Classification:
F01P 7/00
Abstract:
An internal combustion engine has a variable speed coolant pump which is operated at a variable duty-cycle at lower coolant temperatures, while transitioning to a predetermined fixed speed during a final warmup period of operation, and finally to a select-speed operation at one of a selected number of steady state operating speeds selected as a function of at least engine load.