Fuel injection control apparatus and fuel injection control method for direct injection engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakahide Kyuuma, Noboru Takagi, Osamu Hosokawa
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Abstract
An engine has an injector, which directly injects fuel into a combustion chamber. When the coolant temperature during the cranking of the engine is low, an ECU controls the injector such that the engine is operated in a compression stroke injection mode. When the engine is operated in the compression stroke injection mode, the ECU controls the injector to advance the fuel injection timing in accordance with an increase of the coolant temperature. As a result, the engine reduces the amount of unburned discharge gas, provides improved ignition and combustion, and provides stable idling.
Claims12
A fuel injection control apparatus for an engine, in which an injector directly injects fuel into a combustion chamber, the apparatus comprising a controller for controlling the injector, wherein, when the engine is cold, the controller controls the injector in a first mode, in which the fuel is injected during the compression stroke of the engine, wherein the controller controls the injector to advance the timing of the injection of the first mode in accordance with an increase of a coolant temperature of the engine, and wherein the controller determines the timing of the injection of the first mode according to the difference between a temperature that is determined based on the coolant temperature during cranking of the engine and a current coolant temperature.
A fuel injection control apparatus for an engine, in which an injector directly injects fuel into a combustion chamber, wherein the engine is operated in a fuel injection mode selected between a first injection mode, in which the fuel is injected during the compression stroke, and a second injection mode, in which the fuel is injected during the intake stroke, the apparatus comprising:
- a sensor for sensing a coolant temperature of the engine;
- and
- control means for controlling the injector such that the engine is operated in the first injection mode when the coolant temperature during the cranking of the engine is less than a predetermined value, wherein, when the engine is operated in the first injection mode, the control means controls the injector to advance the fuel injection timing in accordance with an increase of the coolant temperature, and further wherein when the engine is operated in the first injection mode, the control means advances the fuel injection timing as the difference between the threshold temperature and the current coolant temperature decreases, the threshold temperature being equivalent to the sum of the coolant temperature during cranking and a predetermined temperature.
A fuel injection control method for an engine, wherein fuel is directly injected into a combustion chamber, the method comprising:
- injecting fuel during the compression stroke of the engine when the engine is cold;
- and
- advancing the fuel injection timing in accordance with an increase of a coolant temperature of the engine when the injection is executed during the compression stroke, wherein the fuel injection timing is determined in accordance with a difference between a temperature that is determined based on an engine coolant temperature during cranking of the engine and a current coolant temperature.
Dependencies are inferred from the claim text.