Abstract: At least after off of an injection pulse of partial lift injection, a first filtered voltage Vsm1 being a negative terminal voltage Vm of a fuel injection valve filtered by a first low-pass filter having a first frequency f1 as a cutoff frequency, the first frequency f1 being lower than a frequency of a noise component, is acquired, and a second filtered voltage Vsm2 being the negative terminal voltage Vm filtered by a second low-pass filter having a second frequency f2 as a cutoff frequency, the second frequency f2 being lower than the first frequency f1, is acquired. Time from a predetermined reference timing to a timing when a difference Vdiff (=Vsm1?Vsm2) between the filtered voltages has an inflection point is calculated as voltage inflection time Tdiff, and the injection pulse of the partial lift injection is corrected based on the voltage inflection time Tdiff.

Abstract: A fuel supply device (1) has a valve (13) in a fuel passage between a fuel pump (3) and an engine (5). In a storage portion of an ECU (18-21) is stored a relationship between a fuel pressure and a flow rate, which are required by the engine, and voltage which is supplied to a motor (7). The ECU senses voltages V26, V27, V28 supplied to the motor from a controller (22) when the valve is opened from change points C1?, C2?, C3? at which a characteristic between the voltage and the current which are supplied to the motor (7) is changed. Then, the ECU corrects the voltage stored in the storage portion on the basis of differences between voltages V1, V2, V5 stored in the storage portion at the change points C1, C2, C3 and the voltages V26, V27, V28 when the valve is opened. In this way, the fuel supply device can correctly control the motor in correspondence to the fuel pressure and the flow rate which are required by the engine.

Abstract: A control system of an internal combustion engine provided with a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine, a second fuel injection valve that injects fuel into an intake port of the internal combustion engine, an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to an intake passage thereof, an EGR valve that is arranged in the EGR passage, and an obtaining unit that obtains an amount of intake air in the internal combustion engine. When the EGR valve is open, a determination is made as to whether the amount of intake air is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, and a value of the amount of intake air thus obtained is corrected based on the determination.

Abstract: The present invention has an object to obtain an accurate amount of intake air at the time of an operation of an EGR mechanism in a control system of an internal combustion engine which is provided with a first fuel injection valve for injecting fuel into a cylinder, a second fuel injection valve for injecting fuel into an intake port, and the EGR mechanism.

Abstract: During a shut-down period of an engine based on an idle stop control, a computer estimates a power stroke cylinder and a compression stroke cylinder when the engine is stopped. A fuel is injected into the power stroke cylinder and the compression stroke cylinder in an intake stroke just before the engine is stopped. An air-fuel mixture is hold in each cylinder with the engine stopped. When an auto start is required while the engine is stopped, a spark ignition is performed in the power stroke cylinder to start cranking of the engine by combustion energy. At nest ignition timing, a spark ignition is performed in the compression stroke cylinder to start the engine without an aid of a starter.

Abstract: During a shut-down period of an engine based on an idle stop control, a computer estimates a power stroke cylinder and a compression stroke cylinder when the engine is stopped. A fuel is injected into the power stroke cylinder and the compression stroke cylinder in an intake stroke just before the engine is stopped. An air-fuel mixture is hold in each cylinder with the engine stopped. When an auto start is required while the engine is stopped, a spark ignition is performed in the power stroke cylinder to start cranking of the engine by combustion energy. At nest ignition timing, a spark ignition is performed in the compression stroke cylinder to start the engine without an aid of a starter.