Control system and method for hybrid vehicle

• US 9,096,209 B2
• Filed: 12/06/2010
• Issued: 08/04/2015
• Est. Priority Date: 09/17/2010
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Kim, Sang Joon
• Primary Examiner(s): Nguyen, Cuong H
• Application Number:
  US12/961,227
• Publication Number:
  US 20120072061A1
• Time in Patent Office: 1,702 Days
• Field of Search: 701/22, 180/65.265, 180/65.29, 903/904, 903/930, 903/903, 903/915, 290/40.R, 252/182.1, 473/3
• US Class Current: 1/1
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2552/15 Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 2552/25 Road altitude
• CPC Class Codes: B60W 2555/40 Altitude
• 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 903/915 Specific drive or transmission adapted for hev

Abstract

The present invention relates to a control system and a method for a hybrid vehicle which may optimally control the operating point of a vehicle. A control method for a hybrid vehicle includes detecting driving requests and a state of charge (SOC) of a battery when the vehicle is driving in HEV mode, determining a motor operating point and an engine operating point when the battery is in low SOC state, and compensating the motor operating point and the engine operating point by applying a climbing degree of the vehicle and the atmospheric pressure.

Claims

1. A control method for a hybrid vehicle comprising:

detecting, by a driving request detecting unit, when either an accelerator or brake pedal is operated;

determining, by an operating point determining unit, a state of charge (SOC) of a battery when the vehicle is driving in a hybrid electric vehicle mode;

measuring, by an operating point compensation unit, a degree of incline a vehicle is currently traveling on and determining an atmospheric pressure that the vehicle is currently driving in;

determining, by the operating point determining unit, a motor operating point and an engine operating point when the battery is below a preset SOC; and

compensating, by the operating point compensation unit, the motor operating point and the engine operating point by applying the degree of incline of the vehicle and the atmospheric pressure to a compensation calculation,

wherein a shift speed is kept below a certain shift speed to increase an engine RPM when the vehicle is driving above a first certain climbing degree, and

wherein the charging amount of the battery by the motor is limited when the vehicle is driving below to a second certain climbing degree to prevent or reduce generation of vibration.

2. The method of claim 1, wherein compensation of the motor operating point is prohibited when the vehicle is driving in below a preset atmospheric pressure.