Failure diagnosis apparatus for fuel level sensor and failure diagnosis method for fuel level sensor
First Claim
1. A failure diagnosis apparatus for a fuel level sensor, the fuel level sensor detecting a fuel remaining quantity within a fuel tank, the fuel tank including at least a first tank and a second tank, the failure diagnosis apparatus comprising:
- a range determining unit for determining a range of a fuel remaining quantity on the basis of an output value of the fuel level sensor, the range being classified into a plurality of ranges in accordance with an output characteristic of the fuel level sensor; and
a range failure diagnosis unit for carrying out failure diagnosis of the fuel level sensor for each range by comparing a fuel consumption quantity since the ranges of a fuel remaining quantity are changed with a failure determining threshold value individually set up for each range,wherein in a dead zone range, in which a change in the output value of the fuel level sensor becomes smaller than the change before a fuel consumer is switched from the first tank to the second tank when the fuel consumer is switched, the range failure diagnosis unit sets the failure determining threshold value to a value corresponding to a fuel consumption quantity required to pass through the dead zone range.
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Accused Products
Abstract
A failure diagnosis apparatus for a fuel level sensor that detects a fuel remaining quantity within a fuel tank including at least a first tank and a second tank includes: a range deter mining unit for determining a range of a fuel remaining quantity on the basis of an output value of the fuel level sensor, the range being classified into a plurality of ranges in accordance with an output characteristic of the fuel level sensor; and a range failure diagnosis unit for carrying out failure diagnosis of the fuel level sensor for each range by comparing a fuel consumption quantity since the ranges are changed with a failure determining threshold value individually set up for each range. In a dead zone range in which a change in the output value of the fuel level sensor becomes small when a fuel consumer is switched from the first tank to the second tank, the range failure diagnosis unit sets the failure determining threshold value to a value corresponding to a fuel consumption quantity required to pass through the dead zone range.
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Citations
4 Claims
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1. A failure diagnosis apparatus for a fuel level sensor, the fuel level sensor detecting a fuel remaining quantity within a fuel tank, the fuel tank including at least a first tank and a second tank, the failure diagnosis apparatus comprising:
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a range determining unit for determining a range of a fuel remaining quantity on the basis of an output value of the fuel level sensor, the range being classified into a plurality of ranges in accordance with an output characteristic of the fuel level sensor; and a range failure diagnosis unit for carrying out failure diagnosis of the fuel level sensor for each range by comparing a fuel consumption quantity since the ranges of a fuel remaining quantity are changed with a failure determining threshold value individually set up for each range, wherein in a dead zone range, in which a change in the output value of the fuel level sensor becomes smaller than the change before a fuel consumer is switched from the first tank to the second tank when the fuel consumer is switched, the range failure diagnosis unit sets the failure determining threshold value to a value corresponding to a fuel consumption quantity required to pass through the dead zone range. - View Dependent Claims (2, 3)
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4. A failure diagnosis method for a fuel level sensor, the fuel level sensor detecting a fuel remaining quantity within a fuel tank, the fuel tank including at least a first tank and a second tank, the failure diagnosis method comprising:
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a range determining step of determining a range of a fuel remaining quantity on the basis of an output value of the fuel level sensor, the range being classified into a plurality of ranges of the fuel remaining quantity in accordance with an output characteristic of the fuel level sensor; and a range failure diagnosis step of carrying out failure diagnosis of the fuel level sensor for each range by comparing a fuel consumption quantity since the ranges are changed with a failure determining threshold value individually set up for each range, wherein in the range failure diagnosis step, the failure determining threshold value is set to a value corresponding to a fuel consumption quantity required to pass through a dead zone range in the dead zone range in which a change in the output value of the fuel level sensor becomes smaller than the change before a fuel consumer is switched from the first tank to the second tank when the fuel consumer is switched.
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Specification