Automatic change-gear control device for use in electromobile

• US 4,096,418 A
• Filed: 03/30/1977
• Issued: 06/20/1978
• Est. Priority Date: 06/18/1976
• Status: Expired due to Term

• Current Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Original Assignee: Agency for Industrial Science and Technology
• Inventors: Shibata, Takanori, Marumoto, Katsuji, Suzuki, Toshio, Yamamura, Hirohisa, Omae, Tsutomu
• Primary Examiner(s): Dobeck, B.
• Application Number:
  US05/782,937
• Time in Patent Office: 447 Days
• Field of Search: 318/139, 318/12, 318/395, 318/396, 318/397, 318/398, 180/65 R, 192/0.02 R
• US Class Current: 318/12
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: F16H 63/502 for smoothing gear shifts
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An electromobile equipped with an automatic transmission which may detect a running condition of a vehicle and selects a gear ratio suited for the running condition. In this electromobile, a build-up characteristic of an electric motor current immediately after gear-change is improved, thereby minimizing delay in power transmission so as to shorten a gear-changing duration, in an attempt to improve an operational feeding of a driver at the time of gear change.

Claims

1. An automatic change-gear control device for use in an electromobile, comprising:

a driving electric motor;

a motor driving circuit connected between said driving electric motor and a d.c. power source or battery;

a transmission disposed between said driving motor and a driving wheel, and including a clutch and change gears;

a main command circuit for controlling a motor current according to command signals from an accelerator and brake means;

a motor control circuit for feeding a control signal to said motor driving circuit by receiving an output of said main command circuit;

means for detecting a motor current;

a transmission logic circuit for generating a signal adapted to change over and control said clutch and gears in said transmission according to a predetermined given pattern by using as an input a detected motor current and a vehicle speed, said logic circuit driving said clutch so as to bring said gears in engagement with said motor, after said gears have been selected, upon completion of speed matching;

speed matching control means for adjusting the r.p.m. of a motor commensurate with a gear ratio after gear-change, with said clutch maintained in a disengaged condition, at the time of gear change;

a deviation-signal compensating circuit disposed between said motor control circuit and said main command circuit for stabilizing a control system; and

a damping compensating circuit for detecting the time when the speed matching is completed, and generating a compensating signal for increasing a motor current for a given time duration after the completion of the speed matching;

whereby the build-up duration of a motor current immediately after gear change may be accelerated so as to shorten a gear changing time.