Evaporative emission system test apparatus and method of testing an evaporative emission system
First Claim
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1. A test apparatus for an evaporative emission system, said apparatus comprising:
- a source of pressure adapted to generate a pressure in the vehicle'"'"'s evaporative emission system that is different from the ambient pressure;
a sensor for sensing the pressure generated in the evaporative emission system; and
an electronic control unit adapted to control the operation of the source of pressure and to receive signals from said sensor reporting the pressure of the vehicle'"'"'s evaporative emission system over time, said electronic control unit further acting to compare the sensed data with stored data representing an average value of standard baseline pressures for vehicles without leaks to determine whether the pressure characteristics are within statistical limits and the presence of a leak in the evaporative emission system.
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Abstract
A test apparatus for an evaporative emission system includes a source of pressure (positive or negative), a sensor for sensing the pressure generated in the evaporative emission system, and an ECU which controls the operation of the source of pressure and receives signals from the sensor reporting the pressure in the vehicle evaporative emission system over time. The ECU compares the sensed data with the stored data representing standard baseline sample vehicles without any leaks to determine the presence of a leak in the evaporative emission system.
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Citations
27 Claims
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1. A test apparatus for an evaporative emission system, said apparatus comprising:
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a source of pressure adapted to generate a pressure in the vehicle'"'"'s evaporative emission system that is different from the ambient pressure; a sensor for sensing the pressure generated in the evaporative emission system; and an electronic control unit adapted to control the operation of the source of pressure and to receive signals from said sensor reporting the pressure of the vehicle'"'"'s evaporative emission system over time, said electronic control unit further acting to compare the sensed data with stored data representing an average value of standard baseline pressures for vehicles without leaks to determine whether the pressure characteristics are within statistical limits and the presence of a leak in the evaporative emission system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for testing a vehicle evaporative emission system, said method including the steps of:
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providing a source of pressure to the vehicle'"'"'s evaporative emission system that is different from the ambient pressure; sensing the status of the pressure in the evaporative emission system over time; comparing the sensed data with stored data representing an average value of standard baseline pressures for vehicles without leaks to determine whether the pressure characteristics are within statistical limits and the presence of a leak in the evaporative emission system. - View Dependent Claims (25, 26, 27)
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Specification