EP0622264A2
Expired / Lapsed
EP
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Electric vehicle drive system and drive method
Assignee: Hitachi Ltd
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Filing: 1994-04-27
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Granted: —
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Expires: 2014-04-27
Abstract
Abstract The object of the present invention is to provide an electric drive system which ensures effective generation of torque from the start to the maximum speed, and extended cruising distance and upgraded running performances. The drive system according to the present invention is characterized in that, in an electric vehicle to be driven by the wheels which are driven by the rotary output of two or more motors (5,6), said two or more motors (5,6) comprise at least two different types of motors, and the system is provided with the control means (10) to adjust the share of the vehicle driving force to be generated by each of said motors in conformity to the running state of said vehicle. These two or more motors (5,6) comprise a combination of a low speed drive motor (5) and high speed drive motor (6), and a highly efficient motor is used as said low speed motor (5), while a motor having a greater capacity and greater base speed than said low speed drive motor (5) is used as the high speed drive motor (6). The share of the driving force of said vehicle is controlled by the control means such that up to the maximum torque is generated by said low speed drive motor (5), with the remaining torque generated by said high speed drive motor (6).
Inventors
- 👤 Nobuyoshi Mutoh
- 👤 Ryoso Masaki
- 👤 Taizou Miyazaki
- 👤 Fumio Tajima
- 👤 Tsutomu Ohmae
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:52
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/20; B60L50/00; B60L50/50; B60L50/60; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/72
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
In an electric vehicle wherein DC power of the vehicle-mounted battery is amplified and is supplies to two or more motors, and the wheels are driven by the torque of two or more motors to drive the vehicle, an electric vehicle drive system characterized in that said two or more motors comprise at least two different types of motors, and the system is provided with the control means to adjust the share of the vehicle driving force to be generated by each of said motors in conformity to the running state of said vehicle.
Claim 2
Dependent Claim
98 words
In an electric vehicle wherein DC power of the vehicle-mounted battery is amplified and is supplies to two or more motors, and the wheels are driven by the torque of two or more motors to drive the vehicle, an electric vehicle drive system characterized in that said two or more motors comprise at least two different types of motors having different operation/torque characteristics, and the system is provided with the control means to adjust the share of the vehicle driving force to be generated by each of said motors in conformity to the running state of said vehicle.
Claim 3
Dependent Claim
103 words
In an electric vehicle wherein DC power of the vehicle-mounted battery is amplified and is supplies to two or more motors, and the wheels are driven by the torque of two or more motors to drive the vehicle, an electric vehicle drive system characterized in that said two or more motors comprise at least two different types of motors having the same electric magnetic compositions but different capacities, and the system is provided with the control means to adjust the share of the vehicle driving force to be generated by each of said motors in conformity to the running state of said vehicle.
Claim 4
Dependent Claim
39 words
An electric vehicle drive system according to Claim 1, 2 or 3 wherein front and rear wheels constitute the drive source of said vehicle, and said front and rear wheels are separately driven by said different types of motors.
Claim 5
Dependent Claim
42 words
An electric vehicle drive system according to Claim 1, 2 or 3 wherein either front or rear wheels constitute the drive source of said vehicle, and said driving wheels are separately driven on the right and left by different types of motors.
Claim 6
Dependent Claim
45 words
An electric vehicle drive system according to Claim 1, 2 or 3 wherein either front or rear wheels constitute the drive source of said vehicle, and said two or more motors to drive the driving wheels are installed on one and the same rotary shaft.
Claim 7
Dependent Claim
109 words
An electric vehicle drive system according to Claim 1 or 2, wherein said two or more motors comprise a combination of a low speed drive motor and high speed drive motor, a highly efficient motor is used as said low speed motor, while a motor having a greater capacity and greater base speed than said low speed drive motor is used as said high speed drive motor, and the share of the driving force of said vehicle is controlled by said control means such that up to the maximum torque is generated by said low speed drive motor, with the remaining torque generated by said high speed drive motor.
Claim 8
Dependent Claim
124 words
An electric vehicle drive system according to Claim 1 or 2, wherein said two or more motors comprise a combination of a low speed drive motor and high speed drive motor, a highly efficient motor is used as said low speed motor, while a motor having a greater capacity and greater base speed than said low speed drive motor is used as said high speed drive motor, and said control means, using the efficiency map of said motors given in advance, determines the ratio of the force to be provided by said low speed drive motor and that to be provided by said high speed drive motor, and exercises control such that torque is generated by each of said motors based on this ratio.
Claim 9
Dependent Claim
34 words
An electric vehicle drive system according to Claim 1 or 2 wherein a synchronous motor is used as said low speed motor, while an induction motor is used as said high speed drive motor.
Claim 10
Dependent Claim
34 words
An electric vehicle drive system according to Claim 1 or 2 wherein a DC motor is used as said low speed motor, while an induction motor is used as said high speed drive motor.
Claim 11
Dependent Claim
46 words
An electric vehicle drive system according to Claim 1 or 2 wherein an induction motor having a greater number of poles is used as said low speed motor, while the induction motor having a smaller number of poles is used as said high speed drive motor.
Claim 12
Dependent Claim
33 words
An electric vehicle drive system according to Claim 1, 2 or 3,characterized in that, of said two or more types of motors, at least one type of the motor has multiple winding coils.
Claim 13
Dependent Claim
36 words
An electric vehicle drive system according to Claim 12 wherein a power amplifier is connected to each terminal of said multiple winding coils, and auxiliary load is connected to at least one said multiple winding coil.
Claim 14
Dependent Claim
84 words
An electric vehicle drive system according to Claim 12 characterized in that, two or more motors comprise a permanent magnetic synchronous motor using the rotor as permanent magnet and using the armature winding of multiple winding structure, and induction motor, wherein part of the multiple winding coils of said permanent magnetic synchronous motor is used as the armature winding to generate driving torque and induced voltage is taken out of the remaining windings to be used as the power source of said auxiliary load.
Claim 15
Dependent Claim
37 words
An electric vehicle drive system according to Claim 1, 2 or 3 characterized in that power is supplied two or more motors mounted on the front and rear wheels in an mutually independent and electrically insulted manner.
Claim 16
Dependent Claim
90 words
An electric vehicle drive system according to Claim 1, 2 or 3 characterized in that the power source used for two or more motors mounted on the front and rear wheels comprises the mutually independent and isolated high density battery and high output battery, and from said high density battery, power is supplied to low speed drive motor which is highly efficient in the low speed range, while from said high output battery, power is supplied to high speed drive motor which is highly efficient in the high speed range.
Claim 17
Dependent Claim
45 words
An electric vehicle drive system according to Claim 1, 2 or 3 wherein the ratio of the drive torque required by said electric vehicle to be generated by each of said two or more motors is determined according to the residual capacity of said battery.
Claim 18
Dependent Claim
72 words
An electric vehicle drive system characterized in that, in the event failure has occurred to any of the systems in a system to drive two or more different types of motors, compensation is made to control said failure in the system where said failure has occurred and the reduction in performance in said system due to the compensation is compensated by the normal drive system, thereby ensuring continued running of the vehicle.
Claim 19
Dependent Claim
189 words
In an electric vehicle drive system which is connected to the rotary shaft of the induced motor and permanent magnetic synchronous motor, and which is driven by the electric power supplied from the battery through the power amplifier and is provided with the power disconnection means to disconnect from the drive system the power transmitted to the shaft of the electric vehicle interlocked with charging of the battery, an electric vehicle battery charging method characterized in that, after the drive system is disconnected from the shaft by the power disconnection means, AC power source synchronized with the commercial power source is made to be generated from the power amplifier, and the induction motor and permanent magnetic synchronous motor are rotated by the AC power source; then supply of the AC power is suspended, and the commercial power source is supplied to the permanent magnetic synchronous motor or induction motor to drive the permanent magnetic synchronous motor and induction motor; as a result, any one of AC voltages having occurred to the windings of the two motors is converted into DC voltage by the power amplifier, thereby charging said battery.
Claim 20
Dependent Claim
77 words
In the electric vehicle drive method where the DC of the vehicle-mounted battery is amplified and supplied to the motors, and the vehicle is driven by the rotary output of the motor, an electric vehicle drive system characterized in that said motors comprise two or more motors having different operational characteristics, and the drive force of the vehicle to be generated by each of the motors is adjusted in conformity to the running state of the vehicle.
Claim 21
Dependent Claim
107 words
An electric vehicle drive method according to Claim 20 wherein said two or more motors comprise a combination of a low speed drive motor and high speed drive motor, a highly efficient motor is used as said low speed motor, while a motor having a greater capacity and greater base speed than said low speed drive motor is used as said high speed drive motor, and the share of the driving force of said vehicle is controlled by said control means such that up to the maximum torque is generated by said low speed drive motor, with the remaining torque generated by said high speed drive motor.
Claim 22
Dependent Claim
122 words
In the electric vehicle drive method where the DC of the vehicle-mounted battery is amplified and supplied to the motors, and the vehicle is driven by the rotary output of the motor, an electric vehicle method system characterized in that said motors comprise two independent drive systems provided with two or more motors having different operational characteristics, and in the event failure has occurred to any of the systems in a system to drive two or more different types of motors, compensation is made to control said failure in the system where said failure has occurred and the reduction in performance in said system due to the compensation is compensated by the normal drive system, thereby ensuring continued running of the vehicle.
References Cited (Backward Citations)
No citation records indexed.
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