Method for diesel particulate filter regeneration in a vehicle equipped with a hybrid engine background of the invention
First Claim
1. A method for regeneration of a diesel particulate filter for a hybrid power train including a diesel engine and an electric motor/generator where the diesel particulate filter is fluidically connected to pass exhaust gas from the diesel engine, the method comprising the steps of:
- periodically initiating regeneration of the diesel particulate filter;
responsive to initiation of regeneration determining if the load carried by the diesel engine is sufficient to produce exhaust gas having a temperature sufficiently high for a sufficient period of time to clear the diesel particulate filter of particulate matter; and
if not;
increasing the load on the diesel engine;
continuing to match hybrid power train output torque to driver demand torque; and
further steps responsive to the electric motor/generator reaching or being at a maximum level of charge of either disabling the electric motor/generator, or converting electrical current from the electric motor/generator into thermal energy and injecting the thermal energy into the diesel particulate filter.
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Abstract
The method for regeneration of a diesel particulate filter of a vehicle equipped with a hybrid engine, wherein the temperature of the exhaust exiting the diesel engine is increased above a predetermined level by increasing load thereon, through optimization of interaction between the diesel particulate filter aftertreatment system and the hybrid engine control through messaging via a communication bus is disclosed. The load on the engine may be increased with or without the assistance of the electric motor/generator of the hybrid engine, and will not affect required acceleration/deceleration of the vehicle.
82 Citations
6 Claims
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1. A method for regeneration of a diesel particulate filter for a hybrid power train including a diesel engine and an electric motor/generator where the diesel particulate filter is fluidically connected to pass exhaust gas from the diesel engine, the method comprising the steps of:
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periodically initiating regeneration of the diesel particulate filter; responsive to initiation of regeneration determining if the load carried by the diesel engine is sufficient to produce exhaust gas having a temperature sufficiently high for a sufficient period of time to clear the diesel particulate filter of particulate matter; and
if not;increasing the load on the diesel engine; continuing to match hybrid power train output torque to driver demand torque; and further steps responsive to the electric motor/generator reaching or being at a maximum level of charge of either disabling the electric motor/generator, or converting electrical current from the electric motor/generator into thermal energy and injecting the thermal energy into the diesel particulate filter. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification