OIL PRESSURE CONTROL IN AN ENGINE
First Claim
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1. An internal combustion engine comprising:
- a fluid lubrication and control system;
a pump configured to maintain fluid pressure in the lubrication and control system when the engine is running; and
an accumulator in fluid communication with the lubrication and control system, the accumulator configured to accumulate and retain fluid when the engine is running, and to discharge the fluid when the engine is not running, thereby maintaining fluid pressure in the lubrication and control system.
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Abstract
An engine having a fluid lubrication and control system is provided. The engine also includes a pump configured to maintain fluid pressure in the lubrication and control system when the engine is running. The engine additionally includes an accumulator in fluid communication with the lubrication and control system. The accumulator is configured to accumulate and retain fluid when the engine is running, and to discharge the fluid when the engine is not running in order to maintain fluid pressure in the lubrication and control system. A method for controlling oil pressure in the engine is also provided.
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Citations
20 Claims
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1. An internal combustion engine comprising:
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a fluid lubrication and control system; a pump configured to maintain fluid pressure in the lubrication and control system when the engine is running; and an accumulator in fluid communication with the lubrication and control system, the accumulator configured to accumulate and retain fluid when the engine is running, and to discharge the fluid when the engine is not running, thereby maintaining fluid pressure in the lubrication and control system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling oil pressure in a vehicle powertrain having an internal combustion engine with a start-stop function, the engine including a fluid lubrication and control system, an oil filter, and an oil pump driven by the engine to maintain fluid pressure to the lubrication and control system when the engine is running, the method comprising:
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accumulating engine oil via an accumulator when the engine is running; retaining the oil in the accumulator when the engine is shut-off, determining whether the engine is shut-off due to a start-stop event; determining whether engine shut-off time is greater than a minimum shut-off time; determining a temperature of the engine oil if the engine shut-off time is greater than the minimum shut-off time; determining an accumulator discharge time based on the determined temperature of the engine oil; and discharging the engine oil via the accumulator for the determined discharge time when the engine is not running to maintain engine oil pressure. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A fluid lubrication and control system for an internal combustion engine having a camshaft phaser operable by fluid pressure, the system comprising:
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a pump configured to maintain fluid pressure in the system when the engine is running; and an accumulator configured to accumulate and retain fluid when the engine is running, and to discharge the fluid when the engine is restarted after being shut-off, wherein the accumulator is in fluid communication with the camshaft phaser such that fluid pressure to the camshaft phaser is maintained by the discharged fluid. - View Dependent Claims (16, 17, 19, 20)
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Specification