System and method for adjusting intake manifold pressure

Patent metadata

Field	Value
Publication number	US-10227936-B2
Application number	US-201715428539-A
Country	US
Kind code	B2
Filing date	Feb 9, 2017
Priority date	Jun 9, 2016
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

Systems and methods for operating an engine with deactivating and non-deactivating valves are presented. In one example, a position of an engine air intake throttle is adjusted during cylinder deactivation to control intake manifold pressure for cylinder reactivation. Closing of the throttle may be timed based on an actual total number of cylinder induction events expected to provide a desired engine intake manifold pressure.

First claim

The invention claimed is:

1. An engine operating method, comprising:
deactivating one or more cylinder poppet valves in a closed state via a controller in response to a deceleration fuel cut off request; and
fully closing a throttle via the controller in response to an actual total number of engine cylinder intake events to provide a desired engine intake manifold pressure in response to the deceleration fuel cut off request.

2. The method of claim 1 , further comprising closing off access to an engine intake manifold from vacuum consumers via the controller.

3. The method of claim 2 , further comprising providing access to the engine intake manifold after closing off access to the engine intake manifold in response to a vacuum reservoir vacuum level.

4. The method of claim 1 , further comprising applying a vacuum to an engine intake manifold to provide the desired engine intake manifold pressure, where the vacuum is provided via an ejector or a vacuum pump.

5. An engine operating method, comprising:
reducing a pressure of an engine intake manifold in response to a deceleration fuel cut off request where all cylinders of an engine cease combustion; and
blocking flow between vacuum consumers and the engine intake manifold via a controller in response to the deceleration fuel cut off request.

6. The method of claim 5 , where the pressure of the engine intake manifold is reduced via closing a throttle and evacuating air from the engine intake manifold via engine cylinders.

7. The method of claim 6 , further comprising applying a vacuum to the engine intake manifold, where the vacuum is provided via an ejector or a vacuum pump.

8. The method of claim 5 , further comprising allowing flow between the vacuum consumers and the engine intake manifold in response to a vacuum level in a vacuum reservoir.

9. A vehicle system, comprising:
an engine including one or more cylinder poppet valves that may be deactivated, a throttle; and
a controller including non-transitory executable instructions, which when executed by the controller, close the throttle and the one or more cylinder poppet valves to be deactivated to provide a desired engine intake manifold pressure in response to a deceleration fuel cut off request, the desired engine intake manifold pressure varying with ambient pressure.

10. The vehicle system of claim 9 , further comprising additional instructions to apply a vacuum to an engine intake manifold while air flow through all cylinders of the engine is inhibited via closing the one or more cylinder poppet valves.

11. The vehicle system of claim 10 , where the vacuum is provided via an ejector.

Assignees

• Ford Global Tech Llc

Inventors

• Richards Adam J
• Rollinger John Eric

Classifications

• F02M35/104

  Intake manifolds · CPC title

• F02D9/02

  concerning induction conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title

• F02D13/06

  Cutting-out cylinders · CPC title

• F02D41/0005 Primary

  during deceleration · CPC title

• F02D2009/0228

  Manifold pressure · CPC title