METHOD FOR IMPROVING ENGINE STARTING
First Claim
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1. An engine starting method, comprising:
- providing a substantially constant air mass to the engine after engine run-up until a predetermined condition;
adjusting ignition timing to provide a torque to achieve a desired engine idle speed while the engine inducts the substantially constant air mass; and
advancing spark timing toward MBT timing in response to an increase in engine torque while the engine inducts the substantially constant air mass.
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Abstract
A method for improving exhaust after treatment initial warm up during engine starting is presented. In one example, the method adjusts an engine air flow amount to a level where a desired substantially constant heat flux is provided by the engine to an exhaust after treatment device. The method may reduce fuel consumption and a need for a vacuum pump to provide vacuum to vacuum consumers of a vehicle during exhaust after treatment heating.
48 Citations
20 Claims
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1. An engine starting method, comprising:
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providing a substantially constant air mass to the engine after engine run-up until a predetermined condition; adjusting ignition timing to provide a torque to achieve a desired engine idle speed while the engine inducts the substantially constant air mass; and advancing spark timing toward MBT timing in response to an increase in engine torque while the engine inducts the substantially constant air mass. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An engine starting method, comprising:
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inducting air to an engine at a substantially constant flow rate after engine start; adjusting ignition timing to provide a desired engine speed; advancing spark until MBT timing in response to an increasing engine load while the engine inducts air at the substantially constant flow rate; and increasing engine air flow to meet engine load after spark timing substantially reaches MBT timing. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A system for starting an engine coupled to a transmission, comprising:
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an engine; an exhaust after treatment device coupled to the engine; and a controller including instructions to provide a substantially constant heat flux from the engine to the exhaust after treatment device in response to a change in engine load. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification