Electric Vehicle

• US 20140336858A1
• Filed: 10/24/2011
• Published: 11/13/2014
• Est. Priority Date: 10/24/2011
• Status: Active Grant

• Current Assignee: Kawasaki Motors
• Original Assignee: Kawasaki Jukogyo Kabushiki Kaisha
• Inventors: Matsushima, Hirohide, Matsuda, Yoshimoto
• Granted Patent: US 9,162,587 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2200/12 Bikes
• CPC Class Codes: B60L 2200/32 Waterborne vessels
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/14 Acceleration
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/461 Speed
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2240/507 Operating parameters
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2250/28 Accelerator pedal thresholds
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 58/30 for monitoring or controlling fuel cells
• CPC Class Codes: B62J 45/4151 for sensing lateral inclination of the cycle
• CPC Class Codes: B62K 11/06 the frame being of single-beam type
• CPC Class Codes: B62K 2204/00 Adaptations for driving cycles by electric motor for driving electrically assisted bicycles B62M6/00
• CPC Class Codes: B62M 11/06 with spur gear wheels B62M11/14 takes precedence
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/40 : Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

An electric vehicle comprises an electric motor; a manual transmission which selects one driving power transmission path and shifts a present driving power transmission path to the selected driving transmission path, in response to a rider changing a speed of the electric motor; a shifting state detecting device for detecting whether the manual transmission is in a driving power transmission state or in a driving power cut-off state; and a motor controller for executing a first control routine to control the electric motor; wherein in the first routine, torque control of the electric motor is performed when the manual transmission is detected to be in the driving power transmission state, and mitigation control of the electric motor is performed to mitigate an impact caused by shifting, when the manual transmission is detected to be in the driving power cut-off state, the mitigation control being different from the torque control.

Claims

1. An electric vehicle comprising:

an electric motor for generating driving power transmitted to a drive wheel via a driving power transmission path;

a manual transmission which selects one driving power transmission path from among plural driving power transmission paths and shifts a present driving power transmission path to the selected driving transmission path, in response to a rider'"'"'s operation for changing a speed of the driving power from the electric motor;

a shifting state detecting device for detecting whether the manual transmission is in a driving power transmission state in which the manual transmission has completed shifting of the driving power transmission path or in a driving power cut-off state in which the manual transmission is shifting the driving power transmission path; and

a motor controller for executing a first control routine to control the electric motor;

wherein the first control routine, torque control of the electric motor is performed when the shifting state detecting device detects that the manual transmission is in the driving power transmission state, and mitigation control of the electric motor is performed to mitigate an impact caused by shifting of the driving power transmission path, when the shifting state detecting device detects that the manual transmission is in the driving power cut-off state, the mitigation control being different from the torque control.

2. The electric vehicle according to claim 1, further comprising:

an estimating device for estimating the driving power transmission path to which the present driving power transmission path is to be shifted, when the shifting state detecting device detects that the manual transmission is in the driving power cut-off state;

wherein the mitigation control is rotational speed control of the electric motor based on a reduction gear ratio in the estimated driving power transmission path of the manual transmission, and a rotational speed of a rotary member which is located downstream of a shifting location of the driving power transmission path of the manual transmission, in a driving power transmission direction.

3. The electric vehicle according to claim 2,

wherein in the rotational speed control,

the electric motor is controlled such that the rotational speed is reduced when the reduction gear ratio estimated by the estimating device is lower than the reduction gear ratio before shifting of driving power transmission path, and

the electric motor is controlled such that the rotational speed is increased when the reduction gear ratio estimated by the estimating device is higher than the reduction gear ratio before shifting of driving power transmission path.

4. The electric vehicle according to claim 2, further comprising:

a clutch which is capable of inhibiting the driving power from being transmitted between the electric motor and the manual transmission;

wherein the motor controller is capable of executing the first control routine irrespective of an operation state of the clutch.

5. The electric vehicle according to claim 2, further comprising:

a clutch which is capable of inhibiting the driving power from being transmitted between the electric motor and the manual transmission; and

a clutch determiner device for determining whether the clutch is in the driving power transmission state or in the driving power cut-off state;

wherein the motor controller executes the first control routine when the clutch determiner device determines that the clutch is in the driving power transmission state, and executes a second control routine when the clutch determiner device determines that the clutch is in the driving power cut-off state; and

wherein the motor controller performs the rotational speed control of the electric motor in the second control routine.

6. The electric vehicle according to claim 5,

wherein the motor controller performs switching between the first control routine and the second control routine based on an operation state of the clutch when it is detected that a driving state satisfies a predetermined impact mitigation priority condition, and executes the first control routine irrespective of the operation state of the clutch when it is detected that the driving state satisfies a predetermined torque priority condition.

7. The electric vehicle according to claim 2,

wherein after the manual transmission is shifted from the driving power cut-off state to the driving power transmission state,

the motor controller continues the rotational speed control until a predetermined condition is satisfied, and switches the rotational speed control to the torque control when the predetermined condition is satisfied.

8. The electric vehicle according to claim 7,

wherein the motor controller changes the predetermined condition according to a driving state of the electric vehicle.

9. The electric vehicle according to claim 1,

wherein the motor controller performs first torque control and then second torque control when the manual transmission is shifted from the driving power cut-off state to the driving power transmission state;

and

wherein a change amount of output torque which occurs per unit time until the output torque reaches a target torque is made less in the first torque control than in the second torque control.

10. The electric vehicle according to claim 9,

wherein the motor controller changes a degree to which the torque is suppressed in the first torque control or time for which the torque is suppressed in the first torque control, according to a driving state of the electric vehicle.