System and method for intake manifold pressure control

• US 10,024,256 B2
• Filed: 02/10/2017
• Issued: 07/17/2018
• Est. Priority Date: 06/09/2016
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Richards, Adam J., Rollinger, John Eric
• Primary Examiner(s): Kwon, John
• Application Number:
  US15/429,834
• Publication Number:
  US 20170356372A1
• Time in Patent Office: 522 Days
• Field of Search: 701103-105, 701110-112, 701114, 701115, 123481, 123198 F
• CPC Class Codes: F01L 1/181 Centre pivot rocking arms
• CPC Class Codes: F01L 13/0005 Deactivating valves
• CPC Class Codes: F01L 2001/0535 Single overhead camshafts [SOHC]
• CPC Class Codes: F01L 2001/0537 Double overhead camshafts [DOHC]
• CPC Class Codes: F01L 2001/186 Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison
• CPC Class Codes: F01L 2013/001 Deactivating cylinders
• CPC Class Codes: F01L 2250/02 the camshaft being driven by chains
• CPC Class Codes: F01L 2250/04 the camshaft being driven by belts
• CPC Class Codes: F01L 2250/06 the camshaft being driven by gear wheels
• CPC Class Codes: F01L 2800/00 Methods of operation using a variable valve timing mechanism
• CPC Class Codes: F01L 2800/06 Timing or lift different for valves of same cylinder
• CPC Class Codes: F01L 2800/08 Timing or lift different for valves of different cylinders
• CPC Class Codes: F01L 2810/02 Lubrication
• CPC Class Codes: F01L 2820/041 Camshafts position or phase sensors
• CPC Class Codes: F01L 2820/042 Crankshafts position
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02D 13/04 using engine as brake
• CPC Class Codes: F02D 13/06 Cutting-out cylinders
• CPC Class Codes: F02D 17/02 Cutting-out cutting-out engines in multiple engine arrangements F02D25/04
• CPC Class Codes: F02D 2041/0012 with selective deactivation of cylinders
• CPC Class Codes: F02D 2041/0015 : for engines with means for controlling swirl or tumble flow, e.g. by using swirl valves
• CPC Class Codes: F02D 2200/0406 : Intake manifold pressure
• CPC Class Codes: F02D 2200/0411 : Volumetric efficiency
• CPC Class Codes: F02D 2200/703 : Atmospheric pressure
• CPC Class Codes: F02D 41/0007 : for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/0087 : Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• CPC Class Codes: F02D 41/126 : transitional corrections at the end of the cut-off period
• CPC Class Codes: F02D 41/26 : using computer, e.g. microprocessor
• CPC Class Codes: Y02T 10/12 : Improving ICE efficiencies

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.

Claims

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.

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.

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.