Control apparatus for hybrid vehicle

• US 6,356,818 B1
• Filed: 09/26/2000
• Issued: 03/12/2002
• Est. Priority Date: 09/30/1999
• 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: Matsubara, Atsushi, Wakashiro, Teruo, Izumiura, Atsushi, Kitajima, Shinichi, Kuroda, Shigetaka, Sawamura, Kazutomo
• Primary Examiner(s): NGUYEN, TAN QUANG
• Application Number:
  US09/669,721
• Time in Patent Office: 532 Days
• Field of Search: 701/22, 701/70, 180/65.1, 180/65.3, 318/139, 318/376
• US Class Current: 701/22
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60K 6/54 Transmission for changing ratio
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/903 having energy storing means, e.g. battery, capacitor
• CPC Class Codes: Y10S 903/917 with transmission for changing gear ratio
• CPC Class Codes: Y10S 903/947 Characterized by control of braking, e.g. blending of regeneration, friction braking

Abstract

A hybrid vehicle control apparatus for improving fuel consumption ratio by making appropriate the deceleration perception of the hybrid vehicle is provided. It is determined whether the flag setting of a brake ON determination flag is “1”. If the brake is OFF, a brake OFF regeneration amount is obtained, and is assigned to the deceleration regeneration computed value. It is determined whether a remaining batter charge is greater than or equal to a predetermined normal power generation mode execution upper limit remaining charge. In the case where the determination result is yes, it is determined whether a control vehicle speed is greater than or equal to a predetermined high speed deceleration regeneration reduction lower limit vehicle speed. In the case where the determination result is yes, the value obtained by multiplying the deceleration regeneration computed value by a predetermined high speed deceleration regeneration reduction coefficient, for example 0.8, is set as a new deceleration regeneration computed value.

Claims

1. A control apparatus for a hybrid vehicle comprising:

an engine for outputting a propulsion force for a vehicle, a motor for assisting the output from said engine depending on the driving conditions of said vehicle, and a storage unit for storing generated energy when said motor is used as a generator under the output from said engine, and regenerated energy obtained from regeneration of said motor at the time of vehicle deceleration, comprising;

a remaining charge computing device for computing the remaining charge of said storage unit,

a speed detector for detecting the speed of said vehicle,

a regeneration amount setting device for setting the amount to be regenerated from said motor, and

a regeneration amount reduction device for, at the time of reducing the speed of said vehicle when a degree of throttle opening of said vehicle is fully closed state, or fuel supply to said engine is stopped, in the case where said remaining charge is computed by said remaining charge computing device to be greater than or equal to a predetermined remaining charge, and said speed is detected by said speed detector to be greater than or equal to a predetermined speed, multiplying said amount to be regenerated by a predetermined reduction coefficient.

2. A control apparatus for a hybrid vehicle according to claim 1, further comprising:

a brake operation detector for detecting the brake operation of said vehicle, and

a regeneration amount reduction inhibiting device for, in the case where said brake operation detector detects that said brake is working, inhibiting the operation of said regeneration amount reduction device.

3. A control apparatus for a hybrid vehicle according to claim 2, wherein said hybrid vehicle is provided with an automatic transmission and gear shift schedule controller for changing a gear shift schedule according to traveling conditions of said vehicle, and

said regeneration amount reduction inhibiting device, in the case where said gear shift schedule controller is operating, or a deceleration ratio of said automatic transmission is larger than a predetermined deceleration ratio, inhibits the operation of said regeneration amount reduction device.