Method for the regeneration of particulate-filter systems
First Claim
1. A method for the regeneration of a particulate-filter system for the exhaust gases of a diesel engine, said system including a burner (2) having an air-delivery pump (3.1), a fuel-delivery pump (4.3), a fuel metering valve (4.1), a pressure sensor (8.2) measuring the exhaust gas back pressure at said burner (2), a particulate filter (1.1), and a control device (6.0), wherein said burner (2) is locate in the exhaust-gas stream ahead of said particulate filter (1.1) and regeneration takes place by means of burning off of the deposited soot particles in said exhaust-gas stream and said control device (6.0) activates said burner (2) during a certain burning period in dependence on at least the exhaust-gas back pressure that prevails ahead of said particulate filter (1.1), said method comprising the steps of:
- attaining a stable operating condition of said diesel engine (1.0) within a predetermined time period after the starting of said diesel engine (1.0), said stable operating condition being detected by said control device (6.0) receiving rotation-speed signals of predetermined magnitude,testing said pressure sensor (8.2) through a command by said control device (6.0) which causes running of said air-delivery pump (3.1), said command being delivered automatically upon said engine attaining said stable operating condition,detecting a loaded condition of said particulate filter by said control device (6.0) sensing an exhaust gas backpressure in excess of a predetermined value and a combustion chamber temperature in excess of a predetermined value,operating said burner (2) to heat said combustion chamber (1.2) by said command device (6.0) activating delivery of fuel and air to said burner (2) and causing ignition of the latter andstopping operation of said burner (2) by said command device (6) in response to a passage of a predetermined time period and to the combustion chamber temperature being lower than the exhaust gas temperature and lower than a predetermined temperature.
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Accused Products
Abstract
A method for regeneration of a particulate filter in which the attainment of a stable idling operating condition of the diesel engine is waited for, at least within a specifiable time period after the starting of the diesel engine, rotation-speed signals of the diesel engine being registered in the specifiable time period, before a control device registers and evaluates further operating values and outputs control commands to devices of the particulate-filter system in order to insure reliable burning off of soot particles deposited in the particulate filter and prevent damage to the particulate filter due to incorrect control actions.
72 Citations
13 Claims
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1. A method for the regeneration of a particulate-filter system for the exhaust gases of a diesel engine, said system including a burner (2) having an air-delivery pump (3.1), a fuel-delivery pump (4.3), a fuel metering valve (4.1), a pressure sensor (8.2) measuring the exhaust gas back pressure at said burner (2), a particulate filter (1.1), and a control device (6.0), wherein said burner (2) is locate in the exhaust-gas stream ahead of said particulate filter (1.1) and regeneration takes place by means of burning off of the deposited soot particles in said exhaust-gas stream and said control device (6.0) activates said burner (2) during a certain burning period in dependence on at least the exhaust-gas back pressure that prevails ahead of said particulate filter (1.1), said method comprising the steps of:
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attaining a stable operating condition of said diesel engine (1.0) within a predetermined time period after the starting of said diesel engine (1.0), said stable operating condition being detected by said control device (6.0) receiving rotation-speed signals of predetermined magnitude, testing said pressure sensor (8.2) through a command by said control device (6.0) which causes running of said air-delivery pump (3.1), said command being delivered automatically upon said engine attaining said stable operating condition, detecting a loaded condition of said particulate filter by said control device (6.0) sensing an exhaust gas backpressure in excess of a predetermined value and a combustion chamber temperature in excess of a predetermined value, operating said burner (2) to heat said combustion chamber (1.2) by said command device (6.0) activating delivery of fuel and air to said burner (2) and causing ignition of the latter and stopping operation of said burner (2) by said command device (6) in response to a passage of a predetermined time period and to the combustion chamber temperature being lower than the exhaust gas temperature and lower than a predetermined temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification