Fuel injection control for diesel engine
AssigneeNissan Motor Co., Ltd.
InventorMakoto Ootake
Life of this patent
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Abstract
A particulate filter (4) is provided in an exhaust passage (3) of a diesel engine (1) in order to trap particulate matter in exhaust gas. A controller (11) determines a basic fuel injection amount in response to an accelerator pedal depression amount (S22), determines a maximum fuel injection amount in response to an intake air amount of the engine (1) (S10), and sets the smaller of the basic fuel injection amount and the maximum fuel injection amount as the target injection amount (S24-S26). When the deposited amount of particulate matter on the particulate matter filter (4) has exceeded a predetermined amount, reductions in output torque are prevented by increasing the maximum injection amount (S13).
Claims19
A fuel injection control device for a diesel engine, the diesel engine comprising an exhaust passage discharging exhaust gas produced by combustion of a mixture of fuel and air, and a particulate filter trapping particulate matter contained in the exhaust gas, the device comprising:
- a fuel injector injecting fuel;
- a sensor detecting a required output of the diesel engine;
- a sensor detecting an intake air amount of the diesel engine;
- a sensor detecting an operation condition of the engine;
- and
- a programmable controller controlling a fuel injection amount of the fuel injector to a target fuel injection amount, programmed to:
- calculate a basic fuel injection amount based on the required output;
- calculate a maximum fuel injection amount in response to the intake air amount;
- determine based on the operating condition whether or not a deposited amount of the particulate matter on the particulate filter has exceeded a predetermined amount;
- increase the maximum fuel injection amount when the deposited amount of the particulate matter has exceeded the predetermined amount;
- and
- set the smaller of the basic fuel injection amount and the maximum fuel injection amount as the target fuel injection amount.
A fuel injection control device for a diesel engine, the diesel engine comprising an exhaust passage discharging exhaust gas produced by combustion of a mixture of fuel and air, and a particulate filter trapping particulate matter contained in the exhaust gas, the device comprising:
- means for injecting fuel;
- means for detecting a required output of the diesel engine;
- means for detecting an intake air amount of the diesel engine;
- means for detecting an operation condition of the engine;
- means for controlling a fuel injection amount of the fuel injecting means to a target fuel injection amount;
- means for calculating a basic fuel injection amount based on the required output;
- means for calculating a maximum fuel injection amount in response to the intake air amount;
- means for determining based on the operating condition whether or not a deposited amount of the particulate matter on the particulate filter has exceeded a predetermined amount;
- means for increasing the maximum fuel injection amount when the deposited amount of the particulate matter has exceeded the predetermined amount;
- and
- means for setting the smaller of the basic fuel injection amount and the maximum fuel injection amount as the target fuel injection amount.
A fuel injection control method for a diesel engine, the diesel engine comprising an exhaust passage discharging exhaust gas produced by combustion of a mixture of fuel and air, a fuel injector injecting fuel and a particulate filter trapping particulate matter contained in the exhaust gas, the method comprising:
- detecting a required output of the diesel engine;
- detecting an intake air amount of the diesel engine;
- detecting an operation condition of the engine;
- controlling a fuel injection amount of the fuel injecting means to a target fuel injection amount;
- calculating a basic fuel injection amount based on the required output;
- calculating a maximum fuel injection amount in response to the intake air amount;
- determining based on the operating condition whether or not a deposited amount of the particulate matter on the particulate filter has exceeded a predetermined amount;
- increasing the maximum fuel injection amount when the deposited amount of the particulate matter has exceeded the predetermined amount;
- and
- setting the smaller of the basic fuel injection amount and the maximum fuel injection amount as the target fuel injection amount.
Dependencies are inferred from the claim text.