Device for detecting malfunction of fuel evaporative purge system
First Claim
1. A device for detecting a malfunction of a fuel evaporative purge system having a canister for absorbing fuel vapor caused by an evaporation of fuel held in a fuel tank, said purge system absorbing the fuel vapor at least when a vehicle is stopped, and purging the fuel vapor held in said canister to an engine of said vehicle when said vehicle is running, said device comprising:
- means for detecting a temperature inside said canister;
means for calculating a change of said temperature when absorbing the fuel vapor and a change of said temperature when purging the fuel vapormeans for determining whether or not a malfunction has occurred in said system by comparing said changes of temperature calculated by said calculating means with predetermined values.
1 Assignment
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Accused Products
Abstract
A device for detecting a malfunction of a fuel evaporative purge system comprises a temperature sensor for detecting a temperature inside a canister. During the absorbing and purging operations of the purge system, the device calculates changes in the temperature when absorbing and purging and compares the temperature changes with predetermined values denoting that the purge system is operating normally, and determines whether a malfunction has occurred in the purge system from the result of the comparison.
100 Citations
11 Claims
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1. A device for detecting a malfunction of a fuel evaporative purge system having a canister for absorbing fuel vapor caused by an evaporation of fuel held in a fuel tank, said purge system absorbing the fuel vapor at least when a vehicle is stopped, and purging the fuel vapor held in said canister to an engine of said vehicle when said vehicle is running, said device comprising:
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means for detecting a temperature inside said canister; means for calculating a change of said temperature when absorbing the fuel vapor and a change of said temperature when purging the fuel vapor means for determining whether or not a malfunction has occurred in said system by comparing said changes of temperature calculated by said calculating means with predetermined values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification