Hybrid vehicle control system
First Claim
1. A hybrid vehicle control system comprising:
- an engine;
a motor/generator;
a first clutch arranged to change a torque transfer capacity between the engine and the motor/generator;
a second clutch arranged to change a torque transfer capacity between the motor/generator and at least one drive wheel; and
a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the engine is stopped, the first clutch is released and the second clutch is engaged and a hybrid drive mode in which both of the first and second clutches are engaged, the controller being further configured to determine whether a power train braking force from a power train of a vehicle that drives the drive wheel is sufficient to achieve a target braking force, and the controller being further configured to operate a wheel brake to apply a wheel braking force against a wheel of the vehicle to maintain the target braking force when an accelerator pedal depressing amount is detected as being substantially zero and when the power train braking force is not sufficient to achieve the target braking force.
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Accused Products
Abstract
A hybrid vehicle control system is configured to use automatic braking to compensate for an excess or deficiency of a braking force available from the power train of a hybrid vehicle that occurs when the hybrid vehicle switches from an electric drive (EV) mode to a hybrid drive (HEV) mode when the accelerator pedal depressing amount is detected as being substantially zero. In particular, hybrid vehicle control system determines whether a power train braking force from the power train is sufficient to achieve a target braking force. If the power train braking force is sufficient to achieve the target braking force when an accelerator pedal depressing amount is detected as being substantially zero, then a wheel brake is activated to apply a wheel braking force against a wheel of the vehicle to maintain the target braking force.
57 Citations
18 Claims
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1. A hybrid vehicle control system comprising:
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an engine;
a motor/generator;
a first clutch arranged to change a torque transfer capacity between the engine and the motor/generator;
a second clutch arranged to change a torque transfer capacity between the motor/generator and at least one drive wheel; and
a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the engine is stopped, the first clutch is released and the second clutch is engaged and a hybrid drive mode in which both of the first and second clutches are engaged, the controller being further configured to determine whether a power train braking force from a power train of a vehicle that drives the drive wheel is sufficient to achieve a target braking force, and the controller being further configured to operate a wheel brake to apply a wheel braking force against a wheel of the vehicle to maintain the target braking force when an accelerator pedal depressing amount is detected as being substantially zero and when the power train braking force is not sufficient to achieve the target braking force. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hybrid vehicle control system comprising:
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an engine;
a motor/generator;
a first clutch arranged to change a torque transfer capacity between the engine and the motor/generator;
a second clutch arranged to change a torque transfer capacity between the motor/generator and at least one drive wheel; and
a controller configured to selectively control the first and second clutches to switch between an electric drive mode in which the engine is stopped, the first clutch is released and the second clutch is engaged and a hybrid drive mode in which the both of the first and second clutches are engaged, the controller being further configured to apply a braking force to a vehicle by temporarily slip engaging the second clutch, engaging the first clutch, cranking the engine with the motor/generator while suspending supply of fuel to the engine, and reengaging the second clutch, when an accelerator pedal depressing amount is detected as being substantially zero, and the controller being further configured to operate a wheel brake to apply the braking force to the vehicle while the second clutch is slip engaged. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A hybrid vehicle control system comprising:
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first power supply means for supplying a first source of power;
second power supply means for supplying a second source of power;
first power transfer means for selectively changing a torque transfer capacity between the first and second power supply means;
second power transfer means for selectively changing a torque transfer capacity between the second power supply means and at least one drive wheel of a vehicle; and
control means for selectively controlling the first and second power transfer means to switch between an electric drive mode in which the first power supply means is stopped, the first power transfer means is in a non-torque transferring state and the second power transfer means is in a torque transferring state and a hybrid drive mode in which both of the first and second power transfer means are in a torque transferring state, the control means further including a function for shifting from a regenerative braking force applying state to an engine braking force applying state by temporarily slip engaging the second power transfer means, engaging the first power transfer means, rotating the first power supply means with the second power supply means while suspending supply of fuel to the first power supply means, and reconnecting the second power transfer means, when the accelerator pedal depressing amount is detected as being substantially zero, the control means further including a function for operating a wheel brake to apply a wheel braking force to the vehicle while the second power transfer means is slip engaged.
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18. A method of controlling a hybrid vehicle comprising:
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selectively changing a torque transfer capacity between an engine and a motor/generator using a first clutch;
selectively changing a torque transfer capacity between the motor/generator and at least one drive wheel of a vehicle;
selectively control the first and second clutches to switch between an electric drive mode in which the engine is stopped, the first clutch is released and the second clutch is engaged and a hybrid drive mode in which both of the first and second clutches are engaged;
shifting from a regenerative braking force applying state to an engine braking force applying state by temporarily slip engaging the second clutch, engaging the first clutch, cranking the engine with the motor/generator while suspending supply of fuel to the engine, and reengaging the second clutch, when the accelerator pedal depressing amount is detected as being substantially zero; and
operating a wheel brake to apply a wheel braking force to the vehicle while the engagement of the second clutch is slip engaged.
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Specification