Control device for internal combustion engine
AssigneeHitachi Automotive Systems, Ltd.
InventorsHiroaki Hoshika, Takeo Hosokawa
Life of this patent
Estimating the term…
Abstract
In order to provide a highly precise and highly responsive humidity detection means with which diagnosis is easy, this control device for an internal combustion engine is characterized in that two or more sensors for detecting the humidity of the atmosphere or a gas mixed with the atmosphere are provided in the middle of the flow in an intake air passage of the internal combustion engine, at least one of these sensors being a relative humidity sensor for detecting the relative humidity, at least one other of the sensors being an absolute humidity sensor for detecting the absolute humidity, and the relative humidity sensor being arranged upstream from the absolute humidity sensor.
Claims7
A control device for an internal combustion engine, the control device comprising:
- an absolute humidity sensor located in a middle of a flow of an intake passage of the internal combustion engine, wherein the absolute humidity sensor detects an absolute humidity of gas in the intake passage of the internal combustion engine at a first location;
- a relative humidity sensor located in the middle of the flow of the intake passage of the internal combustion engine, wherein the relative humidity sensor is located upstream of the absolute humidity sensor in the flow detects a relative humidity of gas in the intake passage of the internal combustion engine at a second location;
- a temperature sensor that measures of a temperature of comb-shaped electrodes and a polymer that comprise the absolute humidity sensor;
- an engine control unit (ECU) that is communicatively coupled to the absolute humidity sensor, the relative humidity sensor and the temperature sensor,
- wherein the ECU is configured to:
- calculate a first mixing ratio based on the relative humidity detected by the relative humidity sensor,
- calculate a second mixing ratio based on the temperature measured by the temperature sensor and the absolute humidity detected by the absolute humidity sensor, and
- control the internal combustion engine based on the first mixing ratio and second mixing ratio.
Dependencies are inferred from the claim text.