Method of operating a piston-type internal combustion engine
First Claim
1. A method of operating a piston-type internal combustion engine having cylinders with intake and exhaust valves of which the valves of at least some cylinders are closed during engine driven operation above a predetermined engine speed and an electrically operated coolant circulation pump, said method comprising the step of controlling the speed of the electrically operated coolant circulating pump depending on the number of cylinders shut down during engine driven operation.
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Accused Products
Abstract
In a method of operating a piston-type internal combustion engine including cylinders with gas exchange valves of which at least some are closed when the engine is operated in an engine-driven state above a predetermined engine speed and the engine includes an electrically operated coolant circulating pump wherein the coolant circulating pump speed is controlled depending on the number of cylinders shut down during operation in the engine driven state.
17 Citations
5 Claims
- 1. A method of operating a piston-type internal combustion engine having cylinders with intake and exhaust valves of which the valves of at least some cylinders are closed during engine driven operation above a predetermined engine speed and an electrically operated coolant circulation pump, said method comprising the step of controlling the speed of the electrically operated coolant circulating pump depending on the number of cylinders shut down during engine driven operation.
Specification