Engine starting apparatus
First Claim
1. A starting apparatus for an engine having a plurality of cylinders and an output shaft, the apparatus comprising:
- a power supply;
an inverter having a switching element;
a motor generator that is coupled to the output shaft and connected to the power supply through the inverter;
an energization controlling section that energizes the motor generator by controlling the inverter when the engine is started;
an ignition section, wherein, the ignition section causes ignition to occur in a specific cylinder that contains air-fuel mixture and is in an expansion stroke in an engine stopping state, thereby rotating the output shaft;
a rotational speed detecting section that directly or indirectly detects a rotational speed of the motor generator; and
an energization prohibiting section, wherein, after the ignition caused by the ignition section, the energization prohibiting section prohibits the energization controlling section from energizing the motor generator until the rotational speed detected by the rotational speed detecting section reaches or exceeds a predetermined value.
1 Assignment
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Accused Products
Abstract
A starting apparatus for an engine has a plurality of cylinders and an output shaft. The apparatus includes a power supply, an inverter having a switching element, a motor generator, an ECU, A crank angle sensor. The motor generator is coupled to the output shaft and connected to the power supply through the inverter. The ECU energizes the motor generator by controlling the inverter when the engine is started. The ECU causes ignition to occur in a specific cylinder that contains air-fuel mixture and is in an expansion stroke in an engine stopping state. The crank angle sensor indirectly detects a rotational speed of the motor generator. After the ignition caused, the ECU prohibits the motor generator from being energized until the rotational speed detected reaches or exceeds a predetermined value. As a result, the apparatus curbs an excessive increase in the temperature of a switching element.
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Citations
20 Claims
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1. A starting apparatus for an engine having a plurality of cylinders and an output shaft, the apparatus comprising:
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a power supply; an inverter having a switching element; a motor generator that is coupled to the output shaft and connected to the power supply through the inverter; an energization controlling section that energizes the motor generator by controlling the inverter when the engine is started; an ignition section, wherein, the ignition section causes ignition to occur in a specific cylinder that contains air-fuel mixture and is in an expansion stroke in an engine stopping state, thereby rotating the output shaft; a rotational speed detecting section that directly or indirectly detects a rotational speed of the motor generator; and an energization prohibiting section, wherein, after the ignition caused by the ignition section, the energization prohibiting section prohibits the energization controlling section from energizing the motor generator until the rotational speed detected by the rotational speed detecting section reaches or exceeds a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An engine system comprising:
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an engine having a plurality of cylinders and an output shaft; a power supply; an inverter having a switching element; a motor generator that is coupled to the output shaft and connected to the power supply through the inverter; a device that directly or indirectly detects a rotational speed of the motor generator; and a controller that energizes the motor generator by controlling the inverter when starting the engine, wherein the controller causes ignition to occur in a specific cylinder that contains air-fuel mixture and is in an expansion stroke in an engine stopping state, thereby rotating the output shaft, and wherein the controller prohibits energizing the motor generator until the rotational speed detected by the device reaches or exceeds a predetermined value after the ignition. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A starting method for an engine having a plurality of cylinders and an output shaft, wherein the output shaft is coupled to a motor generator, and wherein the motor generator is connected to a power supply through an inverter having a switching element, the method comprising:
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energizing the motor generator by controlling the inverter when the engine is started; causing ignition to occur in a specific cylinder that contains air-fuel mixture and is in an expansion stroke in an engine stopping state, thereby rotating the output shaft; detecting a rotational speed of the motor generator directly or indirectly; and prohibiting energizing the motor generator until the detected rotational speed reaches or exceeds a predetermined value after the ignition. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification