Patent Number: 7,086,374

Title: PWM control of a lifter oil manifold assembly solenoid

Abstract: A solenoid driver generates a current signal to drive a solenoid of a lifter oil manifold assembly (LOMA) to switch a displacement on demand engine between activated and deactivated modes. The solenoid driver includes a current module that generates the current signal based on a duty cycle signal and a switching module that regulates the duty cycle signal based on the activated and deactivated modes. The duty cycle signal is 100% for a first period after the engine switches to the deactivated mode and is variable for a second period after the first period.

Inventors: McDonald; Mike M. (Macomb, MI), Albertson; William C. (Clinton Township, MI)

Assignee: General Motors Corporation

International Classification: F02B 77/00 (20060101)

Expiration Date: 8/08/02018