Torque control map to initiate engine startup processing in a hybrid vehicle
First Claim
1. A hybrid system control method,the hybrid system comprisingan internal combustion engine,variable speed means for varying and outputting a rotational velocity of the internal combustion engine,electric means for electrically driving drive wheels,a battery for the electric means, andcontrol means that has a map for deciding target torques of the internal combustion engine and the electric means and is for command-controlling the internal combustion engine and the electric means on the basis of the map,and in the map, there are defined a maximum torque line that demarcates an upper limit torque that the electric means is capable of supplying as a function of at least a vehicle velocity and a battery state-of-charge and a margin torque line that is a predetermined margin lower than the maximum torque line,the control method comprising the steps of:
- detecting an accelerator stroke position, the vehicle velocity and the battery state-of-charge;
performing electric travel by the electric means when the position on the map determined by the detected accelerator stroke position, vehicle velocity and battery state-of-charge is in a torque position below the margin torque line;
initiating startup processing of the engine in order to transition to hybrid travel when the position on the map becomes a torque position on or above the margin torque line; and
setting the target torque of the engine and the target torque of the electric means and command-controlling the engine and the electric means in order to achieve a torque corresponding to the detected accelerator stroke position when the position on the map becomes a torque position exceeding the maximum torque line.
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Accused Products
Abstract
To enable a smooth transition from motor travel to hybrid travel despite the situation-of-charge of a battery and reduce shock at the time of engagement of a clutch element.
A hybrid system uses a state map 70 for deciding target torques of an engine and a motor on the basis of an accelerator stroke position, a vehicle velocity and a battery state-of-charge SOC. In the map 70, there are defined a motor maximum torque line that demarcates a motor upper limit torque that changes depending on the SOC and a motor margin torque line that is a predetermined margin lower than the motor maximum torque line. When the position on the map determined by the accelerator stroke position, the vehicle velocity and the battery state-of-charge is below the margin torque line, the hybrid system performs electric travel, and when the position on the map is on or above the margin torque line, the hybrid system initiates engine startup processing, and when the position on the map becomes a torque position exceeding the maximum torque line, the hybrid system sets target torques of the engine and the motor in order to achieve a torque corresponding to the accelerator stroke position.
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Citations
11 Claims
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1. A hybrid system control method,
the hybrid system comprising an internal combustion engine, variable speed means for varying and outputting a rotational velocity of the internal combustion engine, electric means for electrically driving drive wheels, a battery for the electric means, and control means that has a map for deciding target torques of the internal combustion engine and the electric means and is for command-controlling the internal combustion engine and the electric means on the basis of the map, and in the map, there are defined a maximum torque line that demarcates an upper limit torque that the electric means is capable of supplying as a function of at least a vehicle velocity and a battery state-of-charge and a margin torque line that is a predetermined margin lower than the maximum torque line, the control method comprising the steps of: -
detecting an accelerator stroke position, the vehicle velocity and the battery state-of-charge; performing electric travel by the electric means when the position on the map determined by the detected accelerator stroke position, vehicle velocity and battery state-of-charge is in a torque position below the margin torque line; initiating startup processing of the engine in order to transition to hybrid travel when the position on the map becomes a torque position on or above the margin torque line; and setting the target torque of the engine and the target torque of the electric means and command-controlling the engine and the electric means in order to achieve a torque corresponding to the detected accelerator stroke position when the position on the map becomes a torque position exceeding the maximum torque line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification