Humidity measurement device, control device for internal combustion engine, and abnormality detection device
AssigneeDenso Corporation
InventorsJunzo Yamaguchi, Teruaki Kaifu
Life of this patent
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Abstract
A humidity measurement device is configured to measure a humidity of a gas. The humidity measurement device includes: a second-order calculation part to calculate a second-order differential value by performing second-order differentiation by time on a humidity signal output from a humidity detection part; and an adherence determination part to determine whether a liquid has adhered to the humidity detection part based on the second-order differential value obtained by the second-order calculation part.
Claims11
A humidity measurement device configured to measure a humidity of a gas, the humidity measurement device comprising:
- a second-order calculation part configured to calculate a second-order differential value by performing second-order differentiation by time on a humidity signal outputted from a humidity detection part;
- and
- an adherence determination part configured to determine whether a liquid has adhered to the humidity detection part based on the second-order differential value obtained by the second-order calculation part.
A control device for an internal combustion engine, the control device configured to control an operation state of the internal combustion engine supplied with an intake air, the control device comprising:
- a humidity obtaining part configured to obtain a humidity of the intake air based on a humidity signal outputted from a humidity detection part according to the humidity of the intake air;
- a parameter setting part configured to set an obtaining result of the humidity obtaining part as one of parameters for controlling the operation state of the internal combustion engine;
- a second-order calculation part configured to calculate a second-order differential value by performing a second-order differentiation by a time on the humidity signal;
- an adherence determination part configured to determine whether a liquid has adhered to the humidity detection part based on the second-order differential value obtained from the second-order calculation part;
- and
- a substitute setting part configured to set a predetermined substitute humidity for the humidity of the intake air as one of parameters, instead of the obtaining result by the humidity detection part, in response to determination of the adherence determination part that the liquid has adhered to the humidity detection part.
An abnormality detection device configured to detect an adherence of a liquid to a humidity detection part, which is configured to output a humidity signal according to a humidity of a gas as an abnormality, where the abnormality is the detection of the adherence of the liquid to the humidity detection part, the abnormality detection device comprising:
- a second-order calculation part configured to calculate a second-order differential value by performing a second-order differentiation by a time on the humidity signal;
- and
- an adherence determination part configured to determine whether the liquid has adhered to the humidity detection part based on the second-order differential value obtained from the second-order calculation part.
Dependencies are inferred from the claim text.