| 摘要 |
Embodiments provide systems and methods for using a feedback correction factor to determine whether a motor vehicle should be placed in a judging or non-judging mode regarding the on-board diagnostic system. If the feedback correction factor is within a predetermined range, the vehicle is placed in a judging mode. If the feedback correction factor is outside a predetermined range, the vehicle is placed in a non-judging mode. Methods and systems for using an engine oil temperature to determine whether a motor vehicle should be placed in a judging or non-judging mode regarding the on-board diagnostic system are disclosed. If an engine oil temperature, or predicted engine oil temperature, is below a predetermined temperature, the motor vehicle is placed in a non-judging mode. If an engine oil temperature, or predicted engine oil temperature, is above a predetermined temperature, the motor vehicle is placed in a judging mode. |
| 主权项 |
1. A method of controlling an on-board diagnostic system of a motor vehicle, the method comprising:
receiving, by an electronic control unit, a signal from at least one sensor relating to a first air/fuel ratio of the engine; determining, by the electronic control unit, a first air/fuel ratio; calculating, by the electronic control unit, a feedback correction factor by dividing the first air/fuel ratio by an ideal air/fuel ratio; retrieving, by the electronic control unit, a predetermined range associated with the feedback correction factor, wherein the electronic control unit is electronically connected to an on-board diagnostic system; entering, by the on-board diagnostic system, a judging mode if the feedback correction factor is within the predetermined range, wherein the judging mode includes judging at least one on-board diagnostic item to determine whether a diagnostic problem is occurring; and entering, by the on-board diagnostic system, a non-judging mode if the feedback correction factor is outside the predetermined range, wherein the non-judging mode includes ignoring at least one on-board diagnostic item and preventing a malfunction indicator from being activated. |
