Control device for hybrid vehicle

• US 6,435,294 B1
• Filed: 10/12/2000
• Issued: 08/20/2002
• Est. Priority Date: 10/13/1999
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Hara, Kazuhiro, Ochiai, Shinobu
• Primary Examiner(s): Johnson, Brian L.
• Assistant Examiner(s): FISCHMANN, BRYAN R
• Application Number:
  US09/686,903
• Time in Patent Office: 677 Days
• Field of Search: 180/65.2, 180/65.3, 180/65.4, 180/65.6, 180/65.8, 701/22, 318/139, 477/2, 477/3, 477/4, 477/5, 475/5
• US Class Current: 180/65.25
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/903 : having energy storing means, e.g. battery, capacitor

Abstract

A control device of a hybrid vehicle is provided, capable of detecting the over-discharge state of the battery and controlling the charging and discharging rates of the battery for protecting the battery. The control device of the hybrid vehicle comprises an engine which outputs propulsive force to the vehicle, a motor which is directly connected to said engine and which assists the output of the engine, a battery which supplies the electric power to said motor and which is charged by electric energy generated by activating said motor as a generator when the assisting driving force is not necessary, an electric load whose electric energy is supplied by electric power generated by the motor and the battery, and a battery protecting device which increases the rotation speed of said engine when the over-discharge of said battery is detected and which stops supplying the electric power to said electric load when the over-discharge further advances.

Claims

1. A control device of a hybrid vehicle, the hybrid vehicle having an engine, which outputs propulsive force for the vehicle, a motor which is connected to the said engine and which assists the output of the engine, a battery which supplies the electric power to said motor and which is charged by electric energy generated by activating said motor as a generator when the assisting driving force is not necessary, and an electric load whose electric energy is supplied by electric power generated by the motor and the battery, the device comprising:

a battery protecting device which increases an idle rotation speed when the hybrid vehicle is in an idle mode and when an overdischarge of said battery is detected and which stops supplying the electric power to said electric load when overdischarge further advances.

2. A control device of a hybrid vehicle, the hybrid vehicle having an engine which outputs propulsive force for the vehicle, a motor which is connected to said engine and which assists the output of the engine, a battery which supplies electric power to said motor and which is charged by electric energy generated by activating said motor as a generator when the assisting driving force is not necessary, an electric load whose electric energy is supplied by electric power generated by the motor and the battery, the control device comprising:

a contactor for connecting and disconnecting a current supply between said battery and said motor;

an engine stopping device which stops said engine in response to predetermined driving conditions;

a battery protecting device which restarts the engine when it is detected that the state of charge of the battery is overdischarged.