Self-Tuning Active Engine Mount for Vehicles with Active Fuel Management Engine

• US 20090210139A1
• Filed: 02/14/2008
• Published: 08/20/2009
• Est. Priority Date: 02/14/2008
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Maguire, Joel M., Bucknor, Norman K., Gecim, Burak A.
• Granted Patent: US 7,751,963 B2
• Time in Patent Office: Days
• US Class Current: 701/111
• CPC Class Codes: F16F 15/027 comprising control arrangements F16F15/0237 takes precedence

Abstract

An active engine mount assembly for counteracting resultant forces in active fuel management systems, wherein resultant forces are transmitted to a frame of a motorized vehicle generated by the deactivation of at least one cylinder in an internal combustion engine. The active engine mount assembly is fluidly connected to a hydraulic circuit. The hydraulic circuit is operatively connected to an engine crankshaft and operable to actively generate pressure pulses having frequencies self-synchronized with the rotational speed of the crankshaft.

Claims

1. A method for counteracting resultant forces transmitted from an engine, having a rotatable output shaft, to a frame of a motorized vehicle, comprising:

coupling a force-generating apparatus to the output shaft; and

actively generating a counteracting pressure pulse sufficient to neutralize the resultant forces;

wherein said pressure pulse has a frequency that is self-synchronized with the rotational speed of the output shaft.

2. The method of claim 1, further comprising regulating said pressure pulse in accordance with engine speed, wherein said pressure pulse has an amplitude that is controlled as a function of the rotational speed of the output shaft.

3. The method of claim 2, further comprising selectively communicating said pressure pulse to an active engine mount assembly, said active engine mount assembly mounted between the engine and the frame.

4. The method of claim 3, further comprising communicating said pressure pulse to a driving member in response to the resultant forces transmitted to the frame, said driving member integrated within said active engine mount assembly;

wherein communicating said pressure pulse to said driving member includes pressurizing said driving member.

5. The method of claim 4, further comprising counteracting the resultant forces by way of said pressurized driving member.

6. The method of claim 5, wherein said force-generating apparatus is a hydraulic unit integrated with the active engine mount assembly.

7. The method of claim 6, wherein communicating said pressure pulse to said driving member is by way of a pump.

8. The method of claim 6, wherein communicating said pressure pulse to said driving member is by way of an on/off valve.

9. A force-generating apparatus for counteracting resultant forces transmitted from an engine to a frame of a motorized vehicle comprising:

a hydraulic circuit in fluid communication with an engine mount assembly, said engine mount assembly mounted between the engine and the frame;

wherein said hydraulic circuit is operable to actively generate pressure pulses having frequencies self-synchronized with engine speed; and

wherein said hydraulic circuit is operable to selectively communicate said pressure pulses to said engine mount assembly.

10. The force-generating apparatus of claim 9, wherein said hydraulic circuit includes a portion operatively connected to an output shaft of said engine.

11. The force-generating apparatus of claim 10, wherein said engine mount assembly includes an integrated ram member operatively and fluidly connected to said hydraulic circuit, said ram member operable to receive said pressure pulses.

12. The force-generating apparatus of claim 11, wherein said hydraulic circuit comprises:

a first pump operatively connected to a power source and operable to supply pressure to said hydraulic circuit; and

a pressure control mechanism for regulating pressure within said hydraulic circuit, said pressure control mechanism responsive to control signals transmitted from a control module operatively connected to said pressure control mechanism.

13. The force-generating apparatus of claim 12, wherein said pressure control mechanism comprises a proportional valve configured to modulate in response to a change in engine speed;

and

wherein said proportional valve is configured to ensure that the amplitude of said pressure pulses are controlled as a function of engine speed.

14. The force-generating apparatus of claim 13, wherein said hydraulic circuit further comprises a spring biased piston pump having a high pressure chamber refillable via first said pump, said spring biased piston pump operatively connected to said output shaft via a cam directly connected to said output shaft;

wherein said first pump is a lower pressure fixed displacement pump;

wherein said spring biased piston pump is configured to generate said pressure pulses in relation to cam rotation;

wherein said spring biased piston pump is further configured to communicate said pressure pulses to said ram member in response to the resultant forces transmitted to the frame; and

wherein said ram member is pressurized to counteract the resultant forces with a counteracting force applied opposite in direction with respect to the resultant forces, said counteracting force having a frequency that is self-synchronized with engine speed, and an amplitude that is controlled as a function of engine speed.

15. The force-generating apparatus of claim 13, wherein said first pump is a higher pressure fixed displacement pump operatively connected to said output shaft and operable to provide a continuous flow of said pressure pulses to said hydraulic circuit.

16. The force-generating apparatus of claim 15, wherein said hydraulic circuit further comprises an on/off valve operatively connected to said output shaft, said on/off valve configured to communicate said pressure pulses to said ram member in response to the resultant forces transmitted to the frame;

wherein said on/off valve has an on-time energizing frequency that is directly synchronized with the rotational speed of the output shaft; and

wherein said ram member is pressurized to counteract the resultant forces with a counteracting force applied opposite in direction with respect to the resultant forces, said counteracting force having a frequency that is self-synchronized with the rotational speed of said output shaft, and an amplitude that is controlled as a function of engine speed.

17. An actively controlled engine mount system employing a ram to cancel an oscillatory force transmitted to a frame of a motorized vehicle having a multi-cylinder engine drivable on less than the full number of cylinders, wherein the multi-cylinder engine has a rotatable crankshaft when the multi-cylinder engine is running on less than the full number of cylinders, the actively controlled engine mount system comprising:

a cam-driven spring-biased higher pressure piston pump having an outlet and a checked intake;

a fixed displacement lower pressure pump connected to said checked intake of said higher pressure piston pump;

a proportional valve in a controlled bleed rate relationship with said higher pressure piston pump; and

a self-contained circuit connecting said higher pressure piston pump, lower pressure pump, and said proportional valve in fluid flow with each other and connectable with said ram;

wherein said higher pressure piston pump is drivable by a cam rotatable with said crankshaft and configured to provide pulsed pressures of known frequency to said ram;

wherein said proportional valve is passively controlled, without modulation per engine cycle, to yield a phasing corresponding to a certain amplitude; and

wherein said higher pressure piston pump includes a higher pressure chamber refillable by said fixed displacement lower pressure pump in accordance with the configuration of said cam.

18. The actively controlled engine mount system of claim 17, wherein said higher pressure piston pump, said fixed displacement lower pressure pump, said proportional valve, and said self-contained circuit are configured as an integrated hydraulic unit.

19. An engine mount including an integrated ram for a multi-cylinder engine operable on less than the full number of cylinders and at variable engine speed comprising:

an integrated hydraulic unit integratable with the engine mount and operable to generate pressure pulses at frequencies self-synchronized with said engine speed, wherein said integrated hydraulic unit selectively communicates said pressure pulses to said ram.

20. A force-generating apparatus for counteracting resultant forces transmitted to a frame of a motorized vehicle generated by the deactivation of at least one cylinder in an engine operatively engaged thereto, said force-generating apparatus comprising:

a hydraulic circuit in fluid communication with an active engine mount assembly, said active engine mount assembly comprising a spring-damper unit and a ram, said active engine mount assembly mounted between the engine and the frame;

a higher pressure fixed displacement pump operatively connected to a crankshaft of the engine and operable to actively generate and supply high pressure;

a pressure relief valve fluidly connected to said high pressure fixed displacement pump and operable to regulate pressure within said hydraulic circuit;

a solenoid valve operatively connected to said engine crankshaft and operable to selectively communicate pressure pulses to said ram, said pressure pulses self-tuned to frequencies synchronized with the rotational speed of said crankshaft;

a proportional valve fluidly connected to said solenoid valve, said proportional valve operable to regulate amplitude of said pressure pulses in accordance with engine speed;

wherein communication of said pressure pulses to said ram operates to pressurize said ram in order to counteract the resultant forces transmitted to the frame; and

wherein said pressurized ram applies a counteracting force to the frame having a frequency that is self-synchronized with engine speed, and an amplitude that is controlled as function of engine speed.