System of controlling changeover of an electric power source for an electric motor vehicle
First Claim
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1. A system of changing over an electric power source for an electric motor vehicle including a battery unit and a generator, comprising:
- a changeover circuit for changing over a state of connection between said battery unit and said generator including a parallel connection state where said battery unit and said generator are connected in parallel and a series connection state where said battery unit and said generator are connected in series;
means for determining a speed of the vehicle;
means for measuring a current value of an electric motor of said vehicle;
a controller for determining a power supply mode, said controller being adapted to instruct a changeover of the state of connection to said changeover circuit based upon said determined power supply mode, wherein said controller estimates a current value of said electric motor, determines a first proposed power supply mode on the basis of said vehicle speed and said estimated current value and a second proposed power supply mode on the basis of said vehicle speed and said measured current value, compares said estimated current value and said measured current value, and selects the determined power supply mode from said first and second proposed power supply modes in accordance with the comparison, said determining of the first proposed power supply mode including defining the first proposed power supply mode as being the parallel connection state when the estimated current value is larger than a predetermined value and defining the first proposed power supply mode as being the series connection state when the estimated current value is less than the predetermined value, said determining of the second proposed power supply mode including defining the second proposed power supply mode as being the parallel connection state when the measured current value is larger than the predetermined value and defining the second proposed power supply mode as being the series connection state when the measured current value is less than the predetermined value.
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Abstract
A system of changing over an electric power source for an electric motor vehicle including a secondary battery and a generator. The system is provided with a changeover circuit for changing over a state of connection between the secondary battery and the generator; and a controller for determining a power supply mode on the basis of a vehicle speed and an electric current value for driving a motor, the controller being adapted to instruct a changeover to the power supply mode to the switching circuit, thereby allowing high-speed and long-distance running.
83 Citations
5 Claims
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1. A system of changing over an electric power source for an electric motor vehicle including a battery unit and a generator, comprising:
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a changeover circuit for changing over a state of connection between said battery unit and said generator including a parallel connection state where said battery unit and said generator are connected in parallel and a series connection state where said battery unit and said generator are connected in series; means for determining a speed of the vehicle; means for measuring a current value of an electric motor of said vehicle; a controller for determining a power supply mode, said controller being adapted to instruct a changeover of the state of connection to said changeover circuit based upon said determined power supply mode, wherein said controller estimates a current value of said electric motor, determines a first proposed power supply mode on the basis of said vehicle speed and said estimated current value and a second proposed power supply mode on the basis of said vehicle speed and said measured current value, compares said estimated current value and said measured current value, and selects the determined power supply mode from said first and second proposed power supply modes in accordance with the comparison, said determining of the first proposed power supply mode including defining the first proposed power supply mode as being the parallel connection state when the estimated current value is larger than a predetermined value and defining the first proposed power supply mode as being the series connection state when the estimated current value is less than the predetermined value, said determining of the second proposed power supply mode including defining the second proposed power supply mode as being the parallel connection state when the measured current value is larger than the predetermined value and defining the second proposed power supply mode as being the series connection state when the measured current value is less than the predetermined value. - View Dependent Claims (2, 3, 4, 5)
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Specification