System and method for intake manifold pressure control

Patent metadata

Field	Value
Publication number	US-10024256-B2
Application number	US-201715429834-A
Country	US
Kind code	B2
Filing date	Feb 10, 2017
Priority date	Jun 9, 2016
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

Systems and methods for operating an engine with deactivating and non-deactivating valves are presented. In one example, engine volumetric efficiency actuators are adjusted in response to a request to activate engine cylinders so that engine intake manifold pressure is drawn down quickly toward its normal state at the engine's present speed and torque.

First claim

The invention claimed is:

1. An engine operating method, comprising:
adjusting an engine volumetric efficiency actuator while engine cylinders are deactivated to a first position to increase engine cylinder volumetric efficiency via a controller in response to engine intake manifold pressure being greater than a threshold at an engine speed and a driver demand torque, and where the engine cylinders are deactivated via holding cylinder poppet valves closed during an entire engine cycle.

2. The method of claim 1 , where the threshold is a pressure when the engine operates at idle speed and driver demand torque is substantially zero.

3. The method of claim 1 , further comprising adjusting the engine volumetric efficiency actuator to a second position different than the first position when the engine cylinders are not deactivated at the engine speed and driver demand torque.

4. The method of claim 1 , where the engine volumetric efficiency actuator is a camshaft.

5. The method of claim 1 , where the engine volumetric efficiency actuator is a charge motion control valve.

6. The method of claim 1 , further comprising reactivating the engine cylinders via activating the cylinder poppet valves and adjusting the engine volumetric efficiency actuator to a position based on engine speed and driver demand torque after activating the cylinder poppet valves.

7. The method of claim 1 , where the threshold varies with atmospheric pressure.

8. The method of claim 1 , where an engine throttle is not adjusted while the engine volumetric efficiency actuator is adjusted.

9. An engine operating method, comprising:
adjusting an engine volumetric efficiency actuator to a first position in response to a request to activate one or more cylinders when all engine cylinders are not activated during a first condition, the volumetric efficiency actuator adjusted to the first position based on engine speed and driver demand torque; and
adjusting an engine volumetric efficiency actuator to a second position in response to a request to activate one or more cylinders when all engine cylinders are not activated during a second condition, the volumetric efficiency actuator adjusted to the second position based on engine intake manifold pressure.

10. The method of claim 9 , further comprising positioning the engine volumetric efficiency actuator based on engine speed and driver demand torque in response to engine intake manifold pressure reaching a desired engine intake manifold pressure after adjusting the engine volumetric efficiency actuator to the second position.

11. The method of claim 9 , where the volumetric efficiency actuator is a charge motion control valve.

12. The method of claim 9 , where the volumetric efficiency actuator is a camshaft.

13. The method of claim 9 , where the first condition is engine intake manifold pressure less than a threshold.

14. The method of claim 13 , where the second condition is engine intake manifold pressure greater than the threshold.

15. The method of claim 9 , where all engine cylinders are not activated by deactivating poppet valves of cylinders, the poppet valves deactivated via being held in a closed position over an entire engine cycle.

16. A vehicle system, comprising:
an engine including one or more cylinder poppet valves that may be deactivated and a volumetric efficiency actuator; and
a controller including non-transitory executable instructions, which when executed by the controller, adjust a volumetric efficiency actuator to increase engine volumetric efficiency in response to engine intake manifold pressure greater than a threshold and a request to activate one or more engine cylinders when all engine cylinders are deactivated.

17. The vehicle system of claim 16 , where the volumetric efficiency actuator is a turbocharger.

18. The vehicle system of claim 15 , further comprising additional instructions to adjust the volumetric efficiency actuator in response to engine speed and driver demand torque after engine intake manifold pressure is a desired pressure.

19. The vehicle system of claim 15 , where combustion does not occur in all engine cylinders while adjusting the volumetric efficiency actuator.

20. The vehicle system of claim 15 , where all engine cylinders are deactivated via deactivating the one or more cylinder poppet valves via holding the one or more cylinder poppet valves closed during an entire engine cycle.

Assignees

• Ford Global Tech Llc

Inventors

• Richards Adam J
• Rollinger John Eric

Classifications

• F02D13/06

  Cutting-out cylinders · CPC title

• F01L2800/08

  Timing or lift different for valves of different cylinders · CPC title

• F01L2800/06

  Timing or lift different for valves of same cylinder · CPC title

• F02D41/0087 Primary

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

• F01L2810/02

  Lubrication · CPC title