Output control device for internal combustion engine

• US 9,359,970 B2
• Filed: 08/17/2011
• Issued: 06/07/2016
• Est. Priority Date: 09/21/2010
• Status: Active Grant

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: Iino, Hayato
• Primary Examiner(s): Low, Lindsay
• Assistant Examiner(s): JIN, GEORGE C.
• Application Number:
  US13/824,619
• Publication Number:
  US 20130191007A1
• Time in Patent Office: 1,756 Days
• Field of Search: 701/102, 701/103, 903/906, 903/905, 903/40.R, 290/40.C, 290/40.A, 290/40.R, 290/40.B, 180/65.245, 180/65.28, 180/65.29, 180/65.31
• 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 2510/244 Charge state
• CPC Class Codes: F02D 29/06 peculiar to engines driving electric generators
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/1475 Regulating the air fuel ratio at a value other than stoichiometry
• CPC Class Codes: F02D 45/00 Electrical control not provided for in groups F02D41/00 - F02D43/00
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

An output control device for an internal combustion engine mounted on an electrically powered vehicle has a power generator driven by the engine, a drive battery that saves a power generated by the power generator and detects an SOC value of a power saving state, and a drive motor that propels a vehicle by using the power generated by the power generator or the power saved in the drive battery, and controls an output of the engine at a time of power generation of the power generator. The output control device sets an engine output determination value corresponding to a boundary at which an operation state of the engine shifts from stoichiometric operation to enriched operation, and limits an output of the engine to equal to or less than the engine output determination value in correspondence with the detected SOC value of the drive battery.

Claims

1. An output control device for an internal combustion engine mounted on an electrically powered vehicle comprising:

a power generator driven by the internal combustion engine;

a drive battery capable of saving a power generated by the power generator and capable of detecting an SOC value of a power saving state; and

a drive motor capable of propelling a vehicle by using the power generated by at least one of the power generator or the power saved in the drive battery, and controlling an output of the internal combustion engine at a time of power generation of the power generator,

the output control device performing;

setting an engine output determination value corresponding to a boundary at which an operation state of the internal combustion engine shifts from stoichiometric operation to enriched operation,

computing an actual drive motor output based on an acceleration opening degree operated by a driver,

computing a battery request power for an SOC target value based on a detected SOC value of the drive battery, and

limiting an output of the internal combustion engine to equal to or less than the engine output determination value when a sum of the computed actual drive motor output and the computed battery request power exceeds the engine output determination value and the detected SOC value is equal to or more than a predetermined value, wherein the predetermined value is a lower limit value in a common range of the drive battery, and

releasing the output of the internal combustion engine to greater than the engine output determination value when the detected SOC value is less than the predetermined value.