Internal combustion engine and method of controlling the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShinya Kondou, Yasuhiro Oi
Life of this patent
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Abstract
Immediately after startup of the engine, secondary air is supplied by an air pump into each exhaust branch passage via a secondary-air supply passage. A pressure sensor is disposed in the secondary-air supply passage. An output voltage of the pressure sensor decreases as the battery voltage decreases. When the battery voltage is lower than a permissible voltage, the output value of the pressure sensor is inhibited from being used as an output value representing the pressure. Thus, atmospheric pressure can be accurately detected.
Claims18
An internal combustion engine comprising
- a battery;
- and
- a pressure sensor to which a battery voltage is applied from the battery, which produces an output responsive to a pressure, the output value of the pressure sensor changes in accordance with a reduction in the battery voltage,
- wherein a controller inhibits the output value of the pressure sensor from being used as an output value representing the pressure, at a time immediately after an ignition switch is turned on when a fault diagnosis is performed when the battery voltage is lower than a predetermined permissible voltage, and
- wherein when the output value of the pressure sensor varies while the battery voltage is higher than the predetermined permissible voltage immediately after the ignition switch is turned on, said controller determines the output value of the pressure sensor representing atmospheric pressure depending upon a magnitude of variation of the output value.
A method of controlling an internal combustion engine including a battery, and a pressure sensor to which a battery voltage is applied from the battery and which produces an output responsive to a pressure, wherein an output value of the pressure sensor changes in accordance with a reduction in the battery voltage, the method comprising:
- inhibiting the output value of the pressure sensor from being used as an output value representing the pressure at the time when a fault diagnosis is performed when the battery voltage is lower than a predetermined permissible voltage, and
- determining, when the output value of the pressure sensor varies while the battery voltage is higher than the predetermined permissible voltage immediately after the ignition switch is turned on, the output value of the pressure sensor representing atmospheric pressure depending upon a magnitude of variation of the output value.
Dependencies are inferred from the claim text.