Method for reducing the exhaust emissions from an engine system
First Claim
1. A method for reducing exhaust emissions during cold start of an internal combustion engine, the engine being coupled to a starter motor and an exhaust gas treatment device, comprising:
- providing assist to the engine by the starter motor to meet a demanded power when a temperature of the exhaust gas treatment system is less than an operating temperature of the exhaust gas treatment device; and
operating the starter motor as a generator after the operating temperature of the exhaust gas treatment device has been reached.
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Accused Products
Abstract
The invention relates to a method for reducing the exhaust emissions during the cold start of an internal combustion engine (3). According to the method, a starter motor (4) is operated in parallel with the internal combustion engine (3) until the operating temperature of an exhaust gas catalytic converter (1) is reached, to thereby relieve the power demand on the internal combustion engine and thereby to minimize the production of pollutants. The heating of catalytic converter (1) can preferably be accelerated by retarded spark timing, by a delayed shift in automatic transmission (6) and/or by an electrical heater coupled to catalytic converter (1).
22 Citations
21 Claims
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1. A method for reducing exhaust emissions during cold start of an internal combustion engine, the engine being coupled to a starter motor and an exhaust gas treatment device, comprising:
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providing assist to the engine by the starter motor to meet a demanded power when a temperature of the exhaust gas treatment system is less than an operating temperature of the exhaust gas treatment device; and operating the starter motor as a generator after the operating temperature of the exhaust gas treatment device has been reached. - View Dependent Claims (2)
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3. A method for reducing exhaust emissions during cold start of an internal combustion engine, the engine being coupled to a starter motor and an exhaust gas treatment device, comprising:
providing assist to the engine by the starter motor to meet a demanded power until a temperature of the exhaust gas treatment system reaches an operating temperature of the exhaust gas treatment device; and
retarding spark timing of the engine.- View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. An engine system comprising:
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an internal combustion engine; a starter motor coupled to said engine; an exhaust gas treatment device arranged in an engine exhaust of said engine; and a control unit electronically coupled to said engine and said starter motor, said control unit causing said starter motor to provide power to reduce a power provided by said engine until said exhaust gas treatment device achieves an operating temperature wherein said electronic control unit causes spark timing of the engine to be retarded. - View Dependent Claims (12, 13, 14)
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15. A method for reducing exhaust emissions during cold start of an internal combustion engine, the engine being coupled to a starter motor and an exhaust gas treatment device, comprising:
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supplying rotational energy to the engine at rest by the starter motor; providing fuel to the engine when an engine rotational speed substantially exceeds an idle speed; continuing to operate both the engine and the starter motor after fuel is provided to the engine until the exhaust gas treatment device reaches a predetermined temperature; and discontinuing operation of the starter motor when a temperature of the exhaust treatment device exceeds said predetermined temperature. - View Dependent Claims (16, 17, 18, 19)
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20. A method for reducing exhaust emissions during cold start of an internal combustion engine, the engine being coupled to a starter motor and an exhaust gas treatment device, comprising:
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supplying rotational energy to the engine at rest by the starter motor; providing fuel to the engine when an engine rotational speed substantially exceeds an idle speed; continuing to operate both the engine and the starter motor after fuel is provided to the engine until the exhaust gas treatment device reaches a predetermined temperature; and operating said starter motor as a generator when a temperature of the exhaust treatment device exceeds said predetermined temperature. - View Dependent Claims (21)
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Specification