Regeneration control of diesel particulate filter
First Claim
1. A regeneration device for a filter which traps particulate matter contained in an exhaust gas of a diesel engine for a vehicle, comprising:
- a parameter detecting sensor which detects a parameter relating to an amount of particulate matter trapped in the filter;
a removal mechanism which removes the particulate matter trapped by the filter;
a sensor which detects a rotation speed of the diesel engine; and
a programmable controller programmed to;
determine whether or not the amount of particulate matter trapped in the filter has reached a predetermined amount;
calculate an idling frequency which is defined as the proportion of time when the diesel engine runs idle during a latest predetermined time period;
determine a traveling condition of the vehicle based on the idling frequency, wherein the latest predetermined period of time is of sufficient duration to permit calculation of the idling frequency upon which the traveling condition determination can be made; and
control the removal mechanism, when the amount of trapped particulate matter has reached the predetermined amount, to remove the particulate matter by applying a predetermined removal pattern which is different for each traveling condition of the vehicle.
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Accused Products
Abstract
A filter (10) which traps particulate matter contained in the exhaust gas of a diesel engine (20) for a vehicle is regenerated by fuel injection control. A controller (16) calculates a representative value of the operating condition of the diesel engine (20) during a latest predetermined time period, and determines the traveling condition of the vehicle on the basis of this representative value. When the representative value corresponds to a highway traveling condition, fuel injection control is performed in accordance with a pattern for burning all of the particulate matter trapped in the filter (10). Under any other conditions, fuel injection control is performed in accordance with another pattern. Hence optimum filter regeneration can be performed depending on the traveling condition of the vehicle.
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Citations
9 Claims
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1. A regeneration device for a filter which traps particulate matter contained in an exhaust gas of a diesel engine for a vehicle, comprising:
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a parameter detecting sensor which detects a parameter relating to an amount of particulate matter trapped in the filter; a removal mechanism which removes the particulate matter trapped by the filter; a sensor which detects a rotation speed of the diesel engine; and a programmable controller programmed to; determine whether or not the amount of particulate matter trapped in the filter has reached a predetermined amount; calculate an idling frequency which is defined as the proportion of time when the diesel engine runs idle during a latest predetermined time period; determine a traveling condition of the vehicle based on the idling frequency, wherein the latest predetermined period of time is of sufficient duration to permit calculation of the idling frequency upon which the traveling condition determination can be made; and control the removal mechanism, when the amount of trapped particulate matter has reached the predetermined amount, to remove the particulate matter by applying a predetermined removal pattern which is different for each traveling condition of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A regeneration device for a filter which traps particulate matter contained in an exhaust gas of a diesel engine for a vehicle, comprising:
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means for detecting a parameter relating to an amount of particulate matter trapped in the filter; means for removing the particulate matter trapped by the filter; means for detecting a rotation speed of the diesel engine; means for determining whether or not the amount of particulate matter trapped in the filter has reached a predetermined amount; means for calculating an idling frequency which is defined as the proportion of time when the diesel engine runs idle during a latest predetermined time period; means for determining a traveling condition of the vehicle based on the idling frequency, wherein the latest predetermined period of time is of sufficient duration to permit calculation of the idling frequency upon which the traveling condition determination can be made; and means for controlling the removal mechanism, when the amount of trapped particulate matter has reached the predetermined amount, to remove the particulate matter by applying a different pattern according to the traveling condition of the vehicle.
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9. A regeneration method for a filter which traps particulate matter contained in an exhaust gas of a diesel engine for a vehicle, the vehicle comprising means for removing the particulate matter trapped by the filter;
- the method comprising;
determining a parameter relating to an amount of particulate matter trapped in the filter; determining a rotation speed of the diesel engine; determining whether or not the amount of particulate matter trapped in the filter has reached a predetermined amount; calculating an idling frequency which is defined as the proportion of time when the diesel engine runs idle during a latest predetermined time period; determining a traveling condition of the vehicle based on the idling frequency, wherein the latest predetermined period of time is of sufficient duration to permit calculation of the idling frequency upon which the traveling condition determination can be made; and controlling the removal mechanism, when the amount of trapped particulate matter has reached the predetermined amount, to remove the particulate matter by applying a different pattern according to the traveling condition of the vehicle.
- the method comprising;
Specification