Self-tuning active engine mount for vehicles with active fuel management engine
First Claim
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1. 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.
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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.
37 Citations
20 Claims
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1. 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.
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2. 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:
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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.
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3. 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:
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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. - View Dependent Claims (4)
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5. A method for counteracting resultant forces transmitted from an engine, having a rotatable output shaft, to a frame of a motorized vehicle, comprising:
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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. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A force-generating apparatus for counteracting resultant forces transmitted from an engine to a frame of a motorized vehicle comprising:
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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. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification