Control system and method for a valve actuator
First Claim
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1. A method of controlling an engine, the engine including an engine valve, first and second valve actuators, and a cylinder, the method comprising:
- enabling the first valve actuator to actuate the engine valve from a first position in which fluid is prevented from flowing past the engine valve to a second position in which fluid is permitted to flow past the engine valve and return the engine valve to the first position, the first valve actuator including a cam-follower arrangement;
sensing a first temperature indicative of an engine coolant temperature;
enabling the second valve actuator to prohibit the engine valve from returning to the first position when the first temperature is above a first predetermined value, the second valve actuator including a piston-cylinder arrangement; and
disabling the second valve actuator when the first temperature is below the first predetermined value.
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Abstract
A method of controlling an engine having a valve actuation system is provided. The engine is started. A first parameter indicative of a first temperature of the engine is sensed. A second parameter indicative of a second temperature of the engine is sensed. The valve actuation system is disabled to prevent the implementation of a variation on conventional engine valve actuation timing in response to each of the first and second temperatures being below a predetermined value.
45 Citations
19 Claims
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1. A method of controlling an engine, the engine including an engine valve, first and second valve actuators, and a cylinder, the method comprising:
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enabling the first valve actuator to actuate the engine valve from a first position in which fluid is prevented from flowing past the engine valve to a second position in which fluid is permitted to flow past the engine valve and return the engine valve to the first position, the first valve actuator including a cam-follower arrangement; sensing a first temperature indicative of an engine coolant temperature; enabling the second valve actuator to prohibit the engine valve from returning to the first position when the first temperature is above a first predetermined value, the second valve actuator including a piston-cylinder arrangement; and disabling the second valve actuator when the first temperature is below the first predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling an engine, the engine including an engine valve, a detection system, a valve actuator, and a cylinder, the method comprising:
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activating the engine valve from a first position in which fluid is prevented from flowing past the engine valve to a second position in which fluid is permitted to flow past the engine valve and returning the engine valve to the first position with a first valve timing; sensing a first parameter indicative of a first temperature; sensing a second parameter indicative of a second temperature; enabling the detection system to monitor an operation of the valve actuator when at least one of the first and second parameters is above a first predetermined value; enabling the valve actuator to modify the first valve timing when at least one of the first and second parameters is above the first predetermined value and the detection system detects proper operation of the valve actuator; limiting an amount of fuel delivered to the cylinder when the detection system detects improper operation of the valve actuator; and disabling the detection system when the first and second parameters are each below the first predetermined value. - View Dependent Claims (9, 10, 12, 13)
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11. The method of 8, further including limiting an amount of torque generated by the engine when the detection system determines an improper operation of the valve actuator.
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14. An engine valve actuation system comprising:
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a first valve actuator configured to move an engine valve between a first position substantially blocking a flow of fluid past the engine valve and a second position allowing a flow of fluid past the engine valve; a second valve actuator configured to hold the engine valve in a third position allowing a flow of fluid past the engine valve; a first sensor configured to establish a signal indicative of a first temperature; a second sensor configured to establish a signal indicative of a second temperature; a fuel injection system configured to deliver fuel to a combustion chamber; a controller configured to enable operation of the second valve actuator by closing a control valve and selectively enable operation of the second valve actuator when the first temperature is above a first predetermined value and the second temperature is below a second predetermined value. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification