Internal combustion engine control device for carrying out injection amount feedback control

摘要

A control device for an internal combustion engine is provided, which can carry out favorable injection amount feedback control even when a fuel property changes. A cylinder internal pressure sensor (16) that detects a cylinder internal pressure is included. A cylinder internal fresh air amount is calculated based on the cylinder internal pressure detected by the cylinder internal pressure sensor (16) (100). Based on the cylinder internal pressure detected by the cylinder internal pressure sensor (16), an actual heating value is calculated (120). From the calculated cylinder internal fresh air amount, a target heating value in a predetermined excess air ratio is calculated (150). A comparison value of the actual heating value and the target heating value is fed back to a fuel injection amount so that the calculated actual heating value corresponds to the target heating value (160, 170).

主权项

1. A control device for an internal combustion engine which can be supplied with fuels of different alcohol concentrations, comprising:
a cylinder internal pressure sensor that detects a cylinder internal pressure; cylinder internal fresh air amount calculating means that calculates a cylinder internal fresh air amount based on a cylinder internal pressure detected by the cylinder internal pressure sensor in a compression stroke; actual heating value calculating means that calculates an actual heating value based on a cylinder internal pressure detected by the cylinder internal pressure sensor after start of combustion; target heating value calculating means that calculates a basic injection amount injected into the engine by a fuel injector in a predetermined excess air ratio and a target heating value in the predetermined excess air ratio from the cylinder internal fresh air amount calculated by the cylinder internal fresh air amount calculating means, wherein a heating value ratio in the predetermined excess air ratio is determined without an air-fuel sensor; and feedback means that feeds a correction amount corresponding to a comparison value of the actual heating value and the target heating value back to the basic injection amount so that the actual heating value calculated by the actual heating value calculating means corresponds to the target heating value.