Control system for hybrid vehicles
First Claim
1. A control system for a hybrid vehicle including driving wheels, an internal combustion engine, a drive shaft driven by said engine, a traction motor for driving said drive shaft by electrical energy and having a regenerative function of converting kinetic energy of said drive shaft into electrical energy, a transmission arranged between said driving wheels of said vehicle and said engine and said traction motor, and electrical storage means for supplying electrical energy to said traction motor and for storing electrical energy output from said traction motor, the control system comprising:
- desired output-calculating means for calculating a desired regeneration output from said traction motor according to decelerating conditions of said vehicle;
optimal rotational speed-calculating means for calculating an optimal rotational speed of said traction motor at which said traction motor provides a maximum regeneration output, according to said desired output calculated by said desired output-calculating means and a regeneration output limit of said traction motor; and
change gear ratio control means for controlling a change gear ratio of said transmission such that a rotational speed of said traction motor is equal to said optimal rotational speed.
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Accused Products
Abstract
A control system for a hybrid vehicle including a traction motor which drives a drive shaft of the vehicle by electrical energy and has a regenerative function of converting kinetic energy of the drive shaft into electrical energy, a transmission arranged between driving wheels of the vehicle and an internal combustion engine of the vehicle and the traction motor, and a storage battery which supplies electrical energy to the traction motor and stores electrical energy output from the traction motor. A desired output from the traction motor is calculated according to decelerating conditions of the vehicle, and an optimal rotational speed of the traction motor at which the traction motor provides a maximum regeneration output is calculated according to the calculated desired output. The change gear ratio of the transmission is controlled such that the rotational speed of the traction motor is equal to the optimal rotational speed.
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Citations
15 Claims
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1. A control system for a hybrid vehicle including driving wheels, an internal combustion engine, a drive shaft driven by said engine, a traction motor for driving said drive shaft by electrical energy and having a regenerative function of converting kinetic energy of said drive shaft into electrical energy, a transmission arranged between said driving wheels of said vehicle and said engine and said traction motor, and electrical storage means for supplying electrical energy to said traction motor and for storing electrical energy output from said traction motor, the control system comprising:
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desired output-calculating means for calculating a desired regeneration output from said traction motor according to decelerating conditions of said vehicle; optimal rotational speed-calculating means for calculating an optimal rotational speed of said traction motor at which said traction motor provides a maximum regeneration output, according to said desired output calculated by said desired output-calculating means and a regeneration output limit of said traction motor; and change gear ratio control means for controlling a change gear ratio of said transmission such that a rotational speed of said traction motor is equal to said optimal rotational speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification