Control system for motor vehicle having continuously variable transmission

• US 5,655,992 A
• Filed: 11/29/1995
• Issued: 08/12/1997
• Est. Priority Date: 12/05/1994
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Hattori, Yuji
• Primary Examiner(s): TA, KHOI QUANG
• Application Number:
  US08/564,648
• Time in Patent Office: 622 Days
• Field of Search: 477/45, 477/46, 477/48, 477/97, 477/107, 123/425
• US Class Current: 477/107
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/101 Infinitely variable gearings
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: F02P 5/045 combined with electronic control of other engine functions, e.g. fuel injection in general F02D37/02
• CPC Class Codes: F02P 5/152 dependent on pinking detecting or indicating knocks in internal-combustion engines G01L23/22
• CPC Class Codes: F16H 2061/0015 Transmission control for optimising fuel consumptions
• CPC Class Codes: F16H 2061/0018 Transmission control for optimising exhaust emissions
• CPC Class Codes: F16H 61/66 specially adapted for continuously variable gearings control of exclusively fluid gearing F16H61/38
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A control system (in FIG. 1A) for a motor vehicle having a continuously variable transmission, in which a control of better fuel consumption is selected between the retardation angle correction (the correction of the retardation angle side of an advance angle correction) of the ignition timing of an internal combustion engine and the increase correction of the target r.p.m. of a continuously variable transmission, and the selected control is executed, whereby the fuel consumption of the engine is relieved from worsening in a control for the prevention of knocking or for the suppression of NOx in emission.

Claims

1. A control system for a motor vehicle having a continuously variable transmission, wherein at least one of controls of a retardation angle correction of an ignition timing of an internal combustion engine and an increase correction of target r.p.m. of the continuously variable transmission is executed in a specified operating state of the engine;

comprising;

means for comparing a fuel consumption in the execution of the control of the retardation angle correction of the ignition timing and a fuel consumption in the execution of the control of the increase correction of the target r.p.m.;

means for checking either of said controls is to be executed for a better fuel consumption; and

means for selecting the control of the better fuel consumption on the basis of the checked result;

means for executing the selected control.

2. A control system for a motor vehicle having a continuously variable transmission, wherein at least one of controls of a retardation angle correction of an ignition timing of an internal combustion engine and an increase correction of target r.p.m. of the continuously variable transmission is executed in a specified operating state of the engine;

comprising;

means for comparing combinational controls based on a plurality of combinations each of which contains a retardation angle correction magnitude in the retardation angle correction of the ignition timing and an increase correction magnitude in the increase correction of the target r.p.m.;

means for checking any one of the combinational controls is to be executed for the best fuel consumption; and

means for selecting the retardation angle correction magnitude and the increase correction magnitude in the combinational control of said best fuel consumption, on the basis of the checked result; and

means for executing the individual controls of said combinational control on the basis of the selected retardation angle correction magnitude and increase correction magnitude.