Engine start control system
First Claim
1. An engine control system comprising:
- an engine for a vehicle;
a motor/generator having a drive mode for driving the engine to start the engine and a power generation mode for converting mechanical energy from the engine into electric energy;
a first input device for producing a vehicle start command signal;
a second input device for determining an engine revolution speed of the engine; and
a controller for starting an engine cranking operation to start the engine by operating the motor/generator in the drive mode in response to the start command signal, for measuring a time from a start of the engine cranking operation until the engine speed reaches a predetermined engine speed value, for calculating an electric power generation quantity in accordance with the time, and for controlling the power generation of the motor/generator in accordance with the power generation quantity after the arrival of the engine speed at the predetermined engine speed value.
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Accused Products
Abstract
An engine start control apparatus includes a motor/generator and a controller for controlling the motor/generator. The controller starts an engine cranking operation to start the engine by operating the motor/generator in a cranking mode for driving an engine in response to an engine start command signal, monitors an operating condition of the engine cranking operation to produce a mode change signal before an engine speed exceeds a target speed, and switches the motor/generator from the cranking mode to an overshoot control mode to control the power generation of the motor/generator in accordance with a predetermined target parameter such as a target power generation torque and a desired engine speed.
45 Citations
18 Claims
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1. An engine control system comprising:
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an engine for a vehicle;
a motor/generator having a drive mode for driving the engine to start the engine and a power generation mode for converting mechanical energy from the engine into electric energy;
a first input device for producing a vehicle start command signal;
a second input device for determining an engine revolution speed of the engine; and
a controller for starting an engine cranking operation to start the engine by operating the motor/generator in the drive mode in response to the start command signal, for measuring a time from a start of the engine cranking operation until the engine speed reaches a predetermined engine speed value, for calculating an electric power generation quantity in accordance with the time, and for controlling the power generation of the motor/generator in accordance with the power generation quantity after the arrival of the engine speed at the predetermined engine speed value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An engine control system comprising:
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an engine for a vehicle;
a motor/generator having a drive mode for driving the engine to start the engine and a power generation mode for converting mechanical energy from the engine into electric energy;
a first input device for producing a vehicle start command signal;
a second input device for determining an engine revolution speed of the engine by sensing revolution of at least one of the engine and the motor/generator; and
a controller for starting an engine cranking operation to start the engine by operating the motor/generator in the drive mode in response to the start command signal, for producing a speed condition signal when the engine speed reaches a predetermined engine speed value, and for responding to the speed condition signal by terminating the engine cranking operation and instead starting a gradual speed increasing operation to control the motor/generator so as to increase the engine speed gradually to a desired target speed. - View Dependent Claims (10, 11)
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12. An engine control system comprising:
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an engine for a vehicle;
a motor/generator having a drive mode for driving the engine to start the engine and a power generation mode for converting mechanical energy from the engine into electric energy;
a first input device for producing a vehicle start command signal; and
a controller for starting an engine cranking operation to start the engine by operating the motor/generator in the drive mode in response to the start command signal, for producing a condition signal when a duration of the engine cranking operation reaches a predetermined length, and for responding to the condition signal by terminating the engine cranking operation and instead starting a power generating operation to control the motor/generator in the power generation mode in accordance with a predetermined power generation quantity. - View Dependent Claims (13, 14, 15, 16)
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17. An engine control apparatus for controlling a motor/generator to start an engine for a vehicle, comprising:
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means for responding to an engine start command signal by starting an engine cranking operation to start the engine by operating the motor/generator in a cranking mode for driving the engine;
means for monitoring an operating condition of the engine cranking operation to produce a mode change signal before an engine speed exceeds a target speed; and
means for responding to the mode change signal by changing over an operating mode of the motor/generator from the cranking mode to an overshoot control mode to control the motor/generator to generate electric power in such a manner that an operating parameter of the motor/generator becomes equal to a predetermined desired value.
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18. An engine start control process comprising:
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producing an engine start command signal;
starting an engine cranking operation to start the engine by operating an motor/generator in a cranking mode for driving an engine in response to the engine start command signal;
monitoring an operating condition of the engine cranking operation to produce a mode change signal before an engine speed exceeds a target speed; and
responding to the mode change signal by changing over an operating mode of the motor/generator from the cranking mode to an overshoot control mode to control power generation of the motor/generator in accordance with a predetermined target parameter which is one of a desired power generation torque and a desired engine speed.
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Specification