Diesel engine control device
AssigneeIsuzu Motors Limited
InventorNaoya Ishikawa
Life of this patent
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Abstract
In a diesel engine control device, a normal injection mode that implements normal combustion and a premixed injection mode that implements premixed combustion are set, the normal injection mode is implemented when the actual engine operating conditions are in the normal region, and the premixed injection mode is implemented when the actual engine operating conditions are in the premixed region. When one control mode is being implemented in the corresponding engine operating region, the control mode is forcibly switched to the other control mode when the engine enters a predetermined transition state. This makes it possible to switch earlier than normal, and in particular when accelerating, the desired acceleration performance can be obtained.
Claims15
A diesel engine control device that controls the injection quantity and injection timing of fuel injected into a cylinder of a diesel engine,
- wherein are provided two control modes of:
- a normal injection mode in which the injection quantity and injection timing are controlled so that the injected fuel ignites near compression top dead center during an injection period;
- and a premixed injection mode in which the injection quantity and injection timing are controlled so that fuel injection is completed before compression top dead center and the injected fuel ignites near compression top dead center after a premixing period,
- an entire engine operating region is divided into at least two regions, which are a normal region and a premixed region,
- the diesel engine control device comprising:
- normal switching means for switching the control mode so that target values of respective control parameters of the normal injection mode and the premixed injection mode are set in advance separately, the normal injection mode for controlling the control parameters based on the target value set for said normal injection mode is implemented when the actual engine operating conditions are in the normal region, and the premixed injection mode for controlling the control parameters based on the target value set for said premixed injection mode is implemented when the actual engine operating conditions are in the premixed region;
- and
- forcible switching means for setting the target values of the control parameters for the normal injection mode in advance in the premixed region and also for setting the target values of the control parameters for the premixed injection mode in advance in the normal region, said forcible switching means for forcibly switching the control mode to the normal injection mode for controlling the control parameters based on the target value for the normal injection mode set in advance in said premixed region when the engine enters a predetermined transition state while, in said premixed region, said premixed injection mode is being implemented and also for forcibly switching the control mode to the premixed injection mode for controlling the control parameters based on the target value for the premixed injection mode set in advance in said normal region when the engine enters the predetermined transition state while, in said normal region, said normal injection mode is being implemented.
A diesel engine control device that controls the injection quantity and injection timing of fuel injected into a cylinder of a diesel engine,
- wherein are provided two control modes of:
- a normal injection mode in which the injection quantity and injection timing are controlled so that the injected fuel ignites near compression top dead center during an injection period;
- and a premixed injection mode in which the injection quantity and injection timing are controlled so that fuel injection is completed before compression top dead center and the injected fuel ignites near compression top dead center after a premixing period,
- an entire engine operating region is divided into at least two regions, which are a normal region and a premixed region,
- the diesel engine control device comprising:
- normal switching means for switching the control mode so that the normal injection mode is implemented when the actual engine operating conditions are in the normal region, and the premixed injection mode is implemented when the actual engine operating conditions are in the premixed region;
- and
- forcible switching means for forcibly switching one control mode to the other control mode when the engine enters a predetermined transition state while, in the one engine operating region, the one corresponding control mode is being implemented;
- wherein the forcible switching means switches the control mode based on a comparison of a rate of change of an engine load with a predetermined threshold value.
Dependencies are inferred from the claim text.