System and method for deactivating engine cylinders

Patent metadata

Field	Value
Publication number	US-11788480-B2
Application number	US-202217658218-A
Country	US
Kind code	B2
Filing date	Apr 6, 2022
Priority date	May 10, 2019
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

Systems and methods for determining which of an intake valve and an exhaust valve is to be deactivated first when an engine is operated in a variable displacement mode. In one example, an exhaust valve of the cylinder is deactivated before an intake valve of the cylinder when the engine is operated in a static variable displacement operating mode.

First claim

The invention claimed is:

1. An engine control method, comprising:
deactivating an exhaust valve of a cylinder of an engine during a cylinder cycle before deactivating an intake valve of the cylinder during the cylinder cycle during a first condition; and
deactivating the intake valve of the cylinder during the cylinder cycle before deactivating the exhaust valve of the cylinder during the cylinder cycle during a second condition.

2. The method of claim 1 , where the first condition is a request to increase engine efficiency.

3. The method of claim 2 , where the second condition is a request to reduce engine oil consumption.

4. The method of claim 1 , further comprising operating the engine in a rolling variable displacement mode.

5. The method of claim 1 , further comprising operating the engine in a static variable displacement mode.

6. The method of claim 1 , further comprising delivering spark to the cylinder within the cylinder cycle after the exhaust valve is deactivated when the exhaust valve is deactivated before the intake valve during the cylinder cycle.

7. The method of claim 1 , further comprising not delivering spark to the cylinder within the cylinder cycle after the exhaust valve is deactivated when the exhaust valve is deactivated after the intake valve during the cylinder cycle.

Assignees

• Ford Global Tech Llc

Inventors

• Rollinger John
• Krach Adam

Classifications

• F02D13/0257 Primary

  Independent control of two or more intake or exhaust valves respectively, i.e. one of two intake valves remains closed or is opened partially while the other is fully opened · CPC title

• F02D41/0087

  Selective cylinder activation, i.e. partial cylinder operation (deceleration cut-off F02D41/123) · CPC title

• F02D41/30

  Controlling fuel injection {(F02D41/182, F02D41/24 take precedence)} · CPC title

• F02D17/02 Primary

  Cutting-out (cutting-out engines in multiple engine arrangements F02D25/04) · CPC title

• F02D13/06 Primary

  Cutting-out cylinders · CPC title