Power generation control device for electric vehicle

• US 8,852,053 B2
• Filed: 06/14/2011
• Issued: 10/07/2014
• Est. Priority Date: 09/21/2010
• Status: Active Grant

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: Izawa, Kazuyuki
• Primary Examiner(s): Holmes, Justin
• Application Number:
  US13/824,584
• Publication Number:
  US 20130190132A1
• Time in Patent Office: 1,211 Days
• Field of Search: 477/3, 477/7, 477/101, 477/107, 903/903, 903/930, 903/940, 180/65.225
• US Class Current: 477/3
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• 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 10/26 for electrical energy, e.g. batteries or capacitors
• 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 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 2710/244 Charge state
• 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 903/93 Conjoint control of different elements

Abstract

A power generation control device for an electric vehicle includes a power generator driven by an internal combustion engine, a drive battery that stores power generated by the power generator and sensing an SOC that is a state of charge, and a drive motor that propels a vehicle using power generated by the power generator or power stored in the drive battery. The power generation control device controls a power generation torque of the power generator to correspond to an output that is a sum of a drive request output calculated based on a manipulation separately from a drive torque of the drive motor and a battery request output calculated based on the SOC.

Claims

1. A power generation control device for an electric vehicle, comprising:

a power generator driven by an internal combustion engine;

a drive battery capable of storing power generated by the power generator and sensing an SOC that is a state of charge; and

a drive motor capable of propelling a vehicle using power generated by the power generator or power stored in the drive battery,

wherein the power generation control device sets in advance an SOC target value that is a convergence target of the SOC of the drive battery, and controls a power generation torque of the power generator to correspond to an output that is a sum of a drive request output calculated based on a manipulation separately from a drive torque of the drive motor and a battery request output calculated based on a deviation between the SOC of the drive battery and the SOC target value.

2. The power generation control device for an electric vehicle according to claim 1, wherein the power generation control device sets the drive torque of the drive motor, based on an accelerator opening degree and a vehicle speed and using a first map in which the drive torque increases as the accelerator opening degree increases and the drive torque gradually decreases as the vehicle speed increases on a high speed side of the vehicle speed, sets the drive request output on the basis of the manipulation, based only on the accelerator opening degree and using a second map in which the drive request output increases as the accelerator opening degree increases and a rate of increase of the drive request output decreases as the accelerator opening degree increases, and sets the battery request output, based on a deviation between the SOC of the drive battery and an SOC target value and using a third map in which an absolute value of the battery request output that is a power generation correction amount increases as the deviation increases and a rate of increase of the absolute value of the battery request output that is the power generation correction amount gradually decreases as the deviation increases.