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US 10,378,502 B2Granted
Retarded intake cam phaser to improve engine start/stop quality
AssigneeBorgWarner Inc.
InventorsXiaobing Liu, Paul Nahra
Life of this patent
Estimating the term…
Abstract
A number of variations may include a method comprising controlling the combustion phase timing in the first firing cycle of a start/stop combustion engine comprising: providing a camshaft operatively connected to an extended range intake cam phaser; fully or partially retarding the extended range intake cam phaser during an engine restart to control a position of the camshaft and prevent pre-ignition; and retarding a spark timing in the first cylinder to delay the combustion phase timing to improve NVH.
Claims15
A method comprising:
- controlling a combustion phase timing in a first firing cycle of a stop/start combustion engine comprising:
- providing a camshaft operatively connected to an extended range intake cam phaser having a range of authority over 50 crank angle degrees;
- fully or partially retarding the extended range intake cam phaser 20 to 30 crank angle degrees further than a non-extended range cam phaser having a range of authority of 50 crank angle degrees during a restart of the engine to control a position of the camshaft and preventing combustion before a spark is discharged;
- and
- retarding a timing of the spark up to 22 degrees after a piston reaches a top dead center position in the first firing cycle to delay the combustion phase timing to improve Noise, Vibration, and Harshness (NVH).
2 more elements
A method comprising:
- eliminating pre-ignition of a first combustion cycle during warm restart of a stop/start vehicle comprising:
- providing a camshaft operatively connected to an extended range intake cam phaser having a range of authority over 50 crank angle degrees;
- fully or partially retarding the extended range intake cam phaser 20 to 30 crank angle degrees further than a non-extended range cam phaser having a range of authority of 50 crank angle degrees during a warm engine restart to control a position of the camshaft to delay a closing of an intake valve and to prevent combustion before a spark is discharged;
- and
- retarding a timing of the spark of a spark plug up to 22 degrees after a piston reaches a top dead center position to improve NVH.
2 more elements
A method comprising:
- improving a port-fuel injection engine stop/start system comprising:
- eliminating a start of combustion of a first combustion cycle before a spark is discharged during warm restart comprising:
- providing a camshaft operatively connected to an extended range intake cam phaser having a range of authority over 50 crank angle degrees and fully or partially retarding a timing of the extended range intake cam phaser 20 to 30 crank angle degrees further than a non-extended range cam phaser having a range of authority of 50 crank angle degrees during a warm restart of the engine to control a position of a camshaft;
- and
- retarding a timing of the spark in a first firing cycle up to 22 degrees after top dead center.
2 more elements
A product comprising:
- a start/stop vehicle combustion engine comprising:
- a camshaft;
- an extended range intake cam phaser operatively connected to the camshaft, wherein the extended range intake cam phaser comprises a range of authority over 50 crank angle degrees and wherein when the extended range intake cam phaser is fully or partially retarded 20 to 30 crank angle degrees further than a non-extended range cam phaser having a range of authority of 50 crank angle degrees during a warm engine restart, the closing of an intake valve is delayed so that a timing of a spark is effective in controlling combustion in a first firing cycle so that combustion does not start before the spark is discharged.
Dependencies are inferred from the claim text.