Fail-safe device for temperature sensors
First Claim
1. A fail-safe device for a temperature sensor for detecting a temperature of an internal combustion engine, comprising:
- renewal means for renewing a value of the temperature of said engine detected by said temperature sensor and storing the renewed value, the stored renewed value being applied to control of operation of said engine;
low temperature region detecting means for determining whether or not the temperature of said engine is in a low temperature region lower than a predetermined value, on the basis of the detected value of the temperature from said temperature sensor; and
renewal inhibiting means for inhibiting renewal of the detected value from said temperature sensor by said renewal means when the detected value has decreases, while said low temperature region detecting means detects said low temperature region.
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Accused Products
Abstract
A fail-safe device for an engine temperature sensor. A value of the engine temperature detected by the engine temperature sensor is renewed and stored for engine control. While the engine is detected to be in a low temperature region lower than a predetermined value on the basis of the detected value, renewal of the detected value is inhibited when it has decreased. It is determined that the detected value has decreased, when the detected value is lower than a lower limit value. The lower limit value is set to a value corresponding to the detected value when the engine is detected to be in the low temperature region, whereas it is set to the predetermined value when the engine is detected not to be in the low temperature region. Renewal of the detected value is inhibited when the detected value has not remained within a predetermined range over a predetermined time period.
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Citations
9 Claims
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1. A fail-safe device for a temperature sensor for detecting a temperature of an internal combustion engine, comprising:
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renewal means for renewing a value of the temperature of said engine detected by said temperature sensor and storing the renewed value, the stored renewed value being applied to control of operation of said engine; low temperature region detecting means for determining whether or not the temperature of said engine is in a low temperature region lower than a predetermined value, on the basis of the detected value of the temperature from said temperature sensor; and renewal inhibiting means for inhibiting renewal of the detected value from said temperature sensor by said renewal means when the detected value has decreases, while said low temperature region detecting means detects said low temperature region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification