Internal combustion engine boost pressure diagnostic apparatus
First Claim
1. An internal combustion engine boost pressure diagnostic apparatus comprising:
- a boost pressure sensor configured to detect a pressure between a forced induction device and a throttle valve;
a throttle valve opening degree sensor configured to detect a throttle valve opening degree of the throttle valve;
a bypass valve opening degree sensor configured to detect a bypass valve opening degree of a bypass valve provided in a bypass passage that is parallel to the forced induction device to allow intake air to circumvent the forced induction device; and
a control unit configured to determine that the pressure between the forced induction device and the throttle valve is abnormal upon the boost pressure sensor detecting the pressure being equal to or larger than a prescribed value, the throttle valve opening degree sensor detecting the throttle valve opening degree being in a prescribed throttle valve opening degree region, and the bypass valve opening degree sensor detecting the bypass valve opening degree being in a prescribed bypass valve opening degree region;
the bypass valve opening degree sensor including first and second bypass valve opening degree sensors that are configured to detect the bypass valve opening degree of the bypass valve, andthe control unit being further configured to receive first and second bypass valve opening degrees from the first and second bypass valve opening degree sensors and determine that the pressure between the forced induction device and the throttle valve is above a predetermined pressure upon determining that the first and second bypass valve opening degrees differ by an amount larger than a bypass valve opening degree sensor warning determination value.
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Accused Products
Abstract
An internal combustion engine boost pressure diagnostic apparatus includes a boost pressure sensor, a throttle valve opening degree sensor, a bypass valve opening degree sensor and a control unit. The boost pressure sensor detects a pressure between a forced induction device and a throttle valve. The throttle valve opening degree sensor detects a throttle valve opening degree of the throttle valve. The bypass valve opening degree sensor detects a valve opening degree of a bypass valve. The control unit determines that the pressure between the forced induction device and the throttle valve is abnormal upon the boost pressure sensor detecting the pressure being equal to or larger than a prescribed value, the throttle valve opening degree sensor detecting the throttle valve opening degree being in a prescribed opening degree region, and the bypass valve opening degree sensor detecting the bypass valve opening degree being in a prescribed opening degree region.
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Citations
14 Claims
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1. An internal combustion engine boost pressure diagnostic apparatus comprising:
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a boost pressure sensor configured to detect a pressure between a forced induction device and a throttle valve; a throttle valve opening degree sensor configured to detect a throttle valve opening degree of the throttle valve; a bypass valve opening degree sensor configured to detect a bypass valve opening degree of a bypass valve provided in a bypass passage that is parallel to the forced induction device to allow intake air to circumvent the forced induction device; and a control unit configured to determine that the pressure between the forced induction device and the throttle valve is abnormal upon the boost pressure sensor detecting the pressure being equal to or larger than a prescribed value, the throttle valve opening degree sensor detecting the throttle valve opening degree being in a prescribed throttle valve opening degree region, and the bypass valve opening degree sensor detecting the bypass valve opening degree being in a prescribed bypass valve opening degree region; the bypass valve opening degree sensor including first and second bypass valve opening degree sensors that are configured to detect the bypass valve opening degree of the bypass valve, and the control unit being further configured to receive first and second bypass valve opening degrees from the first and second bypass valve opening degree sensors and determine that the pressure between the forced induction device and the throttle valve is above a predetermined pressure upon determining that the first and second bypass valve opening degrees differ by an amount larger than a bypass valve opening degree sensor warning determination value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification