Vehicle, Controller and Control Method Therefor, and Abnormality Detection System for Idle Speed Control Device and Abnormality Determining Method for Idle Speed Control Device
First Claim
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1. A vehicle comprising:
- an engine;
a drive wheel driven by power of the engine;
a vehicle speed sensor for detecting a rotational speed of the drive wheel;
an intake pipe for supplying air to the engine;
an intake pipe pressure sensor for detecting pressure in the intake pipe;
an intake valve located further apart from the engine than the intake pipe pressure sensor in the intake pipe for adjusting a flow passage area of the intake pipe;
an idle speed control device for performing an idle speed control that controls an idling rotational speed by controlling an amount of air flowing through the intake pipe; and
a controlling unit for detecting an abnormality in the idle speed control device based on the pressure in the intake pipe detected by the intake pipe pressure sensor, and suppressing an increase of engine speed when an abnormality in the idle speed control device is detected.
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Abstract
A vehicle speed sensor detects a rotational speed of a rear wheel. A throttle valve is positioned downstream of an intake pipe. An idle speed control device controls the amount of air flowing through the intake pipe to perform an idle speed control. An electronic control unit (ECU) detects an abnormality of the idle speed control (ISC) device based on an intake pipe pressure. The ECU inhibits a rotational speed of the engine from increasing when an abnormality of the ISC device is determined. Precise detection of vehicle speed and suppression of increase of engine rotational speed resulting from an ISC abnormality is thereby achieved.
21 Citations
15 Claims
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1. A vehicle comprising:
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an engine; a drive wheel driven by power of the engine; a vehicle speed sensor for detecting a rotational speed of the drive wheel; an intake pipe for supplying air to the engine; an intake pipe pressure sensor for detecting pressure in the intake pipe; an intake valve located further apart from the engine than the intake pipe pressure sensor in the intake pipe for adjusting a flow passage area of the intake pipe; an idle speed control device for performing an idle speed control that controls an idling rotational speed by controlling an amount of air flowing through the intake pipe; and a controlling unit for detecting an abnormality in the idle speed control device based on the pressure in the intake pipe detected by the intake pipe pressure sensor, and suppressing an increase of engine speed when an abnormality in the idle speed control device is detected. - View Dependent Claims (3, 4, 5, 6, 11)
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2. A vehicle comprising:
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an engine; an electronic continuously variable transmission having an input shaft connected to the engine and an output shaft and capable of continuously controlling a transmission gear ratio between the input shaft and the output shaft; a drive wheel connected to the output shaft; a vehicle speed sensor for detecting a rotational speed of the drive wheel; an intake pipe for supplying air to the engine; an intake pipe pressure sensor detecting pressure in the intake pipe; an intake valve located further apart from the engine than the intake pipe pressure sensor in the intake pipe for adjusting a flow passage area of the intake pipe; an idle speed control device for performing an idle speed control that controls an idling rotational speed by controlling an amount of air flowing through the intake pipe; and a controlling unit for detecting an abnormality in the idle speed control device based on the pressure in the intake pipe detected by the intake pipe pressure sensor, and suppressing an increase of engine speed when an abnormality in the idle speed control device is detected. - View Dependent Claims (7, 8, 9, 10)
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12. A controller for a vehicle having an intake pipe for supplying air to an engine;
- an intake pipe pressure sensor; and
an idle speed control device that controls an idling rotational speed by controlling the amount of air flowing through the intake pipe,wherein the controller detects an abnormality of the idle speed control device based on a pressure in the intake pipe detected by the intake pipe pressure sensor, and suppresses increase of engine speed when an abnormality of the idle speed control device is detected.
- an intake pipe pressure sensor; and
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13. An abnormality detection system for an idle speed control device in a vehicle having an intake pipe for supplying air to an engine and an intake pipe pressure sensor,
wherein an abnormality of the idle speed control device is detected based on a pressure in the intake pipe detected by the intake pipe pressure sensor.
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14. A method of controlling a vehicle having an intake pipe for supplying air to an engine;
- an intake pipe pressure sensor; and
an idle speed control that controls an idling rotational speed by controlling the amount of air flowing through the intake pipe, the method comprising;detecting an abnormality of the idle speed control device based on a pressure in the intake pipe detected by the intake pipe pressure sensor, and suppressing increase of engine speed when an abnormality of the idle speed control device is detected.
- an intake pipe pressure sensor; and
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15. A method of detecting an abnormality of an idle speed control device in a vehicle having an intake pipe for supplying air to an engine and an intake pipe pressure sensor, the method comprising:
detecting an abnormality of the idle speed control device based on a pressure in the intake pipe detected by the intake pipe pressure sensor.
Specification