초록 ▼

In a motor vehicle with idle stop function, upon satisfaction of preset engine restart conditions (step S205), automatic engine restart control refers to a preset map representing a variation in amount of fuel Q1, which is to be initially injected into a cylinder Cyin stopping in an intake stroke, a

In a motor vehicle with idle stop function, upon satisfaction of preset engine restart conditions (step S205), automatic engine restart control refers to a preset map representing a variation in amount of fuel Q1, which is to be initially injected into a cylinder Cyin stopping in an intake stroke, against the piston stop position Pin of the cylinder Cyin, and specifies the amount of fuel Q1 corresponding to the detected piston stop position Pin of the cylinder Cyin (step S220). The automatic engine restart control then controls an injector to inject the specified amount of fuel Q1 into an intake port of the cylinder Cyin (step S230). Under the condition that the piston stop position Pin of the cylinder Cyin suggests low gas intake performance, the increased amount of fuel Q1 is injected into the intake port of the cylinder Cyin. This arrangement desirably reduces a misfire rate at the timing of first combustion and thereby improves the startability of an engine. When the amount of fuel Q1 specified at step S220 is equal to zero, the cylinder Cyin is not subject to the first combustion. Such control desirably prevents poor emission.

대표청구항 ▼

The invention claimed is: 1. An engine start control apparatus that performs control, upon satisfaction of a preset engine restart condition in an engine stop state, to inject a fuel from a fuel injection unit, which is attached to a specific cylinder stopping in an intake stroke, into an intake por

The invention claimed is: 1. An engine start control apparatus that performs control, upon satisfaction of a preset engine restart condition in an engine stop state, to inject a fuel from a fuel injection unit, which is attached to a specific cylinder stopping in an intake stroke, into an intake port of the specific cylinder and to implement first combustion in the specific cylinder on a start of an engine, said engine start control apparatus comprising:a detection unit that detects a piston stop position of the specific cylinder stopping in the intake stroke in the engine stop state;an engine restart condition judgment module that determines whether the preset engine restart condition is satisfied in the engine stop state;a fuel injection control module that, upon determination of satisfaction of the preset engine restart condition by said engine restart condition judgment module, specifies an amount of fuel, which is to be injected into the intake port of the specific cylinder stopping in the intake stroke, corresponding to the piston stop position detected by the detection unit, and controls the fuel injection unit to inject the specified amount of fuel into the intake port of the specific cylinder; anda misfire identification module that identifies whether the first combustion on the start of the engine results in a misfire, the misfire identification module identifying a misfire when a rotation speed of the engine does not reach a preset threshold value upon completion of a first expansion stroke of the specific cylinder,wherein upon identification of a misfire by said misfire identification module, said fuel injection control module estimates a remaining amount of fuel unconsumed for the first combustion, computes an amount of fuel, which is to be injected next time into the intake port of the specific cylinder stopping in the intake stroke in the engine stop state, from the estimated remaining amount of fuel, and controls the fuel injection unit to inject the computed amount of fuel into the intake port of the specific cylinder.