Device and method for monitoring a tank ventilation system
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorErich Kagleder
Life of this patent
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Abstract
The invention relates to a device and a method for testing a tank ventilation system with a tank ventilation valve in a motor vehicle, comprising an engine speed sensor, an air flow sensor and/or an idle controller for providing an air mass signal, as well as an evaluating unit, which compares the changes in speed and air masses with at least one threshold value when the tank ventilation valve is opened and closed. To improve the diagnosis of the tank ventilation system, it is proposed that the evaluating unit be designed in such a manner that a total reaction value, which is compared with a threshold value, is formed from the engine speeds when the tank ventilation valve is opened and closed as well as the air masses when the tank ventilation valve is closed and opened.
Claims13
A device for testing a tank ventilation system with a tank ventilation valve in a motor vehicle, comprising:
- an engine speed sensor;
- an air flow sensor;
- an idle controller for providing an air mass signal;
- and
- an evaluating unit, which compares changes in engine speed and air mass with at least one threshold value when said tank ventilation valve is opened and closed;
- wherein said evaluating unit forms a total reaction value from said engine speed and said air mass when said tank ventilation system is opened and closed and compares said total reaction value with said at least one threshold value.
A method for testing a tank ventilation system comprising:
- measuring a first engine speed when a tank ventilation valve is closed (n0);
- measuring a second engine speed when said tank ventilation valve is opened (n);
- determining a first air mass when said tank ventilation valve is closed (ml0);
- determining a second air mass when said tank ventilation valve is opened (ml);
- forming a total reaction value from said first engine speed and said second engine speed and said first air mass and said second air mass;
- and
- comparing said total reaction value with a preset threshold value.
A device for testing a tank ventilation system with a tank ventilation valve in a motor vehicle, comprising:
- an engine speed sensor;
- an air flow sensor;
- an evaluating unit, which compares changes in an engine speed and an air mass with a first threshold value when said tank ventilation valve is opened;
- and
- an idle controller for providing an air mass signal;
- wherein said evaluating unit compares said changes in said engine speed and said air mass with a second threshold value when said tank ventilation valve is closed, and
- wherein said evaluating unit forms a total reaction value from said engine speed and said air mass when said tank ventilation system is opened and closed and compares said total reaction value with at least one of said first threshold value and said second threshold value.
A method for testing a tank ventilation system comprising:
- measuring a first engine speed when a tank ventilation valve is closed;
- measuring a second engine speed when said tank ventilation valve is opened;
- determining a first air mass when said tank ventilation valve is closed;
- determining a second air mass when said tank ventilation valve is opened;
- forming a total reaction value from said first engine speed and said second engine speed and said first air mass and said second air mass;
- and
- comparing said total reaction value with a preset threshold value.
A method for testing a tank ventilation system comprising the steps of:
- measuring a first engine speed when a tank ventilation valve is closed;
- measuring a second engine speed when said tank ventilation valve is opened;
- determining a first air mass when said tank ventilation valve is closed;
- determining a second air mass when said tank ventilation valve is opened;
- forming a total reaction value from said first engine speed and said second engine speed and said first air mass and said second air mass;
- and
- comparing said total reaction value with a preset threshold value.
Dependencies are inferred from the claim text.