Control system for a hybrid vehicle

• US 6,294,843 B1
• Filed: 02/02/2000
• Issued: 09/25/2001
• Est. Priority Date: 02/03/1999
• 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: Kato, Shinji, Kayano, Morio
• Primary Examiner(s): Ponomarenko, Nicholas
• Application Number:
  US09/496,192
• Time in Patent Office: 601 Days
• Field of Search: 290/40.R, 290/40.A, 290/40.B, 290/40.C, 322/10, 322/16, 322/17, 180/65.1, 180/65.2, 180/65.3, 180/65.4
• US Class Current: 290/40.00C
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: F02N 11/003 said electric motor being also used as a drive for auxiliaries, e.g. for driving transmission pumps or fuel pumps during engine stop
• CPC Class Codes: F02N 11/0866 comprising several power sources, e.g. battery and capacitor or two batteries
• CPC Class Codes: H02J 7/1415 with a generator driven by a prime mover other than the motor of a vehicle
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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: Y10S 903/903 having energy storing means, e.g. battery, capacitor

Abstract

The control system for the hybrid vehicle of the present invention, having an engine for producing a driving force for the vehicle, a motor for producing an assist driving force to assist the output from the engine, and a battery for supplying electric energy to the motor and storing energy regenerated by the motor which acts as a generator, the control system comprises: a voltage detector for detecting a voltage from the battery; a full charge judgement device for judging full charge of the battery based on the voltage detected by the voltage detector; a charging electric power variation detector for detecting variation in a charging electric power for charging the battery; and a full charge judgement prevention device for preventing judging of full charge when the charging electric power variation detector detects the variation in the charging electric power.

Claims

1. A control system for a hybrid vehicle having an engine for producing a driving force for said vehicle, a motor for producing an assist driving force to assist the output from said engine, and a battery for supplying electric energy to said motor and storing energy regenerated by said motor which acts as a generator, said control system comprising:

voltage detector for detecting a voltage from said battery;

full charge judgement device for judging the full charge of said battery based on the voltage detected by said voltage detector;

charging electric power variation detector for detecting variation in a charging electric power for charging said battery; and

full charge judgement prevention device for preventing judging of full charge when said charging electric power variation detector detects the variation in the charging electric power.

2. A system according to claim 1, further comprising:

charging electric power detector for detecting the charging electric power from the product of the voltage and the electric current to the battery, wherein

said charging electric power variation detector for detecting the variation in the electric power based on a variation in at least one of a rotational speed of said engine, the charging electric power, and an electric load driven by the electric power generated by said generator.

3. A system according to claim 1, further comprising:

charging electric power detector for detecting the charging electric power from the product of the voltage from the battery and the electric current from the battery;

electric power update device for storing the detected charging electric power value when the voltage from said battery becomes maximum; and

comparator for comparing the electric power value stored in said electric power update device with the electric power value detected by said charging electric power detector, wherein

said full charge judgement prevention device prevents the judging of the full charge when the difference between the values compared by said comparator is greater than a predetermined value.

4. A control system for a hybrid vehicle having an engine for producing a driving force for said vehicle, a motor for producing an assist driving force to assist the output from said engine, and a battery for supplying electric energy to said motor and storing energy regenerated by said motor which acts as a generator, said control system comprising:

input device for inputting an equal charging starting command; and

equal charging device for fully charging said battery by the electric power generated by said motor used as the generator while said engine is idling.

5. A system according to claim 4, wherein, when the equal charging starting command is input while said vehicle is not parked, said equal charging device does not charge said battery.