Diesel particulate oxidizer regeneration system

In a diesel engine having a fuel injection pump with a retard device and an idle up actuator, a diesel particulate oxidizer regeneration system including:

• a diesel particulate oxidizer disposed in an exhaust passage of the diesel engine for collecting particulates from a combustion chamber of the diesel engine;
• a collection quantity detecting means for detecting the quantity of particulates collected in said diesel particulate oxidizer;
• an operation status detecting means for detecting the status of operation of the diesel engine;
• an indicator means for indicating the regeneration timing of said diesel particulate oxidizer;
• a first control means which receives a signal from said collection quantity detecting means and provides to said indicator means a signal for indication that the diesel particulate oxidizer should be regenerated, when the quantity of particulates collected in the diesel particulate oxidizer exceeds a predetermined value;
• and
• a second control means which receives signals from said collection quantity detecting means and said operation status detecting means and provides a fuel injection timing retard signal to said retard device and a high speed idling signal to said idle up actuator when the quantity of particulates collected in the diesel that the diesel particulate oxidizer should be regenerated, when the quantity of particulates collected in the diesel particulate oxidizer exceeds a predetermined quantity;
• and
• a second control means which receives signals from said operation status detecting means and said manual switch and provides a fuel injection timing retard signal to said retard device and a high speed idling signal to said actuator when said diesel engine is in a predetermined operating condition and when there is input of said diesel particulate oxidizer regeneration desire signal.

In a diesel engine having a fuel injection pump with a retard device and an idle up actuator, a diesel particulate oxidizer regeneration system including:

• a diesel particulate oxidizer disposed in an exhaust passage of the diesel engine for collecting particulates from a combustion chamber of the diesel engine;
• a collection quantity detecting means for detecting the quantity of particulates collected in the diesel particulate oxidizer;
• an operation status detecting means for detecting the status of operation of the diesel engine;
• an indicator means for indicating a regeneration timing of said diesel particulate oxidizer;
• a manual switch for producing a signal indicative of desire for regeneration of the diesel particulate oxidizer;
• a first control means which receives a signal from said collection quantity detecting means and provides to said indicator means a signal for indication;
• a regeneration timing control means for controlling the operation of said regeneration means;
• an idle up actuator capable of controlling the idle state of the diesel engine;
• a temperature detection means for detecting the temperature of said diesel particulate oxidizer;
• and
• a particulate combustion suppressing means which receives a signal from said temperature detection means and provides to said idle up actuator a control signal for increasing the idling revolution of the diesel engine when the temperature of the diesel particulate oxidizer is above a predetermined value.

In a diesel engine having a fuel injection pump and fuel control means for controlling the injection volume or injection timing of said fuel pump, a diesel particulate oxidizer regeneration system including:

• a diesel particulate oxidizer disposed in an exhaust system of the diesel engine and having a trap carrier for collecting unburnt fine particles contained in exhaust gas, said trap carrier supporting an oxidation catalyst;
• a regeneration means for burning the unburnt fine particles collected in said diesel particulate oxidizer;
• a regeneration timing control means including an operation hysteresis storing means for storing and adding operation hysteresis of the engine, and judging means for judging the operation start timing of said regeneration means on the basis of the stored value of said operation hysteresis storing means;
• and
• a regeneration end control means for detecting that the quantity of the unburnt fine particles collected and deposited in the diesel particulate oxidizer has become less than the predetermined value after combustion, and producing a signal for stopping the operation of said regeneration means,
• the stored value of said operation hysteresis storing means being set to an operation hysteresis initial value upon detection of a regeneration end of said diesel particulate oxidizer by said regeneration detection control means.