System and method for regenerating a diesel particulate filter in a motor vehicle while parked
First Claim
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1. A diesel engine comprising:
- an exhaust system through which exhaust gases created by combustion in combustion chambers pass to atmosphere and which comprises an after-treatment device that treats the gases before leaving the exhaust system but that at times requires regeneration by elevation of temperature of the gases to a regeneration temperature range;
an engine control system for processing various data to control various aspects of engine operation for conditioning the gases to cause regeneration of the after-treatment device;
wherein the control system comprises a first regeneration strategy for conditioning the gases to cause oxygen-based regeneration of the after-treatment device and a second regeneration strategy for conditioning exhaust gases to cause nitrogen dioxide-based regeneration of the after-treatment device when the engine is operating at low idle speed in accordance with a low idle speed control strategy.
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Abstract
A system and method for initiation and control of passive regeneration (38, 38B) of a diesel particulate filter (34), and the integration of that regeneration strategy with an active regeneration strategy (36) and a strategy (40, 40A, 40B) for inhibiting passive regeneration. Passive regeneration can be initiated by driver actuation of an instrument panel switch while the vehicle is parked with the engine idling provided that certain conditions confirming that the vehicle is parked and the engine is at proper temperature are satisfied. Control of passive regeneration includes a timing function that sets minimum and maximum times.
26 Citations
16 Claims
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1. A diesel engine comprising:
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an exhaust system through which exhaust gases created by combustion in combustion chambers pass to atmosphere and which comprises an after-treatment device that treats the gases before leaving the exhaust system but that at times requires regeneration by elevation of temperature of the gases to a regeneration temperature range; an engine control system for processing various data to control various aspects of engine operation for conditioning the gases to cause regeneration of the after-treatment device; wherein the control system comprises a first regeneration strategy for conditioning the gases to cause oxygen-based regeneration of the after-treatment device and a second regeneration strategy for conditioning exhaust gases to cause nitrogen dioxide-based regeneration of the after-treatment device when the engine is operating at low idle speed in accordance with a low idle speed control strategy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for regenerating an exhaust after-treatment device in an exhaust system of a diesel engine, the method comprising:
operating the engine to create exhaust gases for causing nitrogen dioxide-based regeneration of the after-treatment device upon concurrence of conditions precedent that include a regeneration-initiation device for initiating such a regeneration being in a condition for initiating such a regeneration, the engine operating at a low idle speed in accordance with a low idle speed control strategy, and engine temperature condition being sufficiently high to initiate nitrogen dioxide-based regeneration. - View Dependent Claims (14)
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15. A diesel engine comprising:
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an exhaust system through which exhaust gases created by combustion in combustion chambers pass to atmosphere and which comprises an after-treatment device that treats the gases before leaving the exhaust system but that at times requires regeneration by elevation of temperature of the gases to a regeneration temperature range; an engine control system for processing various data to control various aspects of engine operation for conditioning the gases to cause regeneration of the after-treatment device; wherein the control system comprises a regeneration strategy for conditioning exhaust gases to cause nitrogen dioxide-based regeneration of the after-treatment device when the engine is operating at low idle speed in accordance with a low idle speed control strategy. - View Dependent Claims (16)
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Specification