Controlling device for non-stage transmission for vehicles

• US 5,025,685 A
• Filed: 07/31/1989
• Issued: 06/25/1991
• Est. Priority Date: 07/29/1988
• 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: Tanaka, Hiroshi, Kobayashi, Akio, Hikichi, Koichi, Yamashita, Shoji, Kumagai, Chiaki, Fujita, Yasumasa
• Primary Examiner(s): Diehl, Dwight
• Application Number:
  US07/388,021
• Time in Patent Office: 694 Days
• Field of Search: 74/862, 74/863, 74/864, 74/866, 364/424.1
• US Class Current: 477/97
• 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: F16H 59/18 dependent on the position of the accelerator pedal
• CPC Class Codes: F16H 59/62 Atmospheric pressure
• CPC Class Codes: F16H 59/66 Road conditions, e.g. slope, slippery
• CPC Class Codes: F16H 59/70 dependent on the ratio established
• CPC Class Codes: F16H 61/421 Motor capacity control by electro-hydraulic control means, e.g. using solenoid valves
• CPC Class Codes: F16H 61/46 Automatic regulation in accordance with output requirements
• CPC Class Codes: F16H 61/462 for achieving a target speed ratio
• CPC Class Codes: F16H 61/66 specially adapted for continuously variable gearings control of exclusively fluid gearing F16H61/38
• CPC Class Codes: Y10S 477/901 Control signal is slope

Abstract

A controlling device for controlling the transmission ratio of a non-stage transmission in a vehicle. The transmission ratio is controlled according to a forecast output power of the vehicle. The output power is forecast based on an operating condition of the vehicle, such as atmospheric pressure. The control considers various operating parameters. A comparison of a predetermined ratio of increase of engine speed or throttle opening with actual ratios of increase of engine speed or throttle opening may be made in controlling the transmission ratio. An uneven road surface is detected and a transmission ratio of the transmission is controlled accordingly to substantially eliminate hunting. An engine speed is controlled so that the engine speed may not exceed a predetermined rotational speed when the transmission gear ratio is fixed. A target engine speed or target transmission ratio is corrected in response to an output signal of a comparison device which compares an actual vehicle velocity with a set vehicle velocity during automatic fixed vehicle velocity running.

Claims

1. A controlling device for controlling the transmission ratio of a non-stage transmission in a vehicle, comprising,

engine output power forecasting means for forecasting an output power of an engine in said vehicle,

transmission ratio adjustment storage means for storing a transmission ratio adjustment value and outputting a transmission ratio adjustment according to said output power forecast,

vehicle condition sensing means for determining an actual running condition of said vehicle,

transmission gear ratio storage means for outputting an initial transmission ratio target value in response to said actual running condition,

adding means for determining a transmission ratio target value based on said initial transmission ratio target value and said transmission ratio adjustment, and

ratio control means for controlling said transmission ratio to correspond with said transmission ratio target value,

wherein said engine output power forecasting means comprises comparison means for comparing a detected atmospheric pressure with a predetermined atmospheric pressure, and wherein said engine output power forecasting means provides said transmission ratio adjustment to said adding means when said detected atmospheric pressure is less than said predetermined atmospheric pressure.

2. A controlling device for a non-stage transmission for a vehicle according to claim 1, wherein said engine output power forecasting means further comprises an output power decrease forecasting means for forecasting a condition wherein the output power of said engine decreases.

3. A controlling device for a non-stage transmission for a vehicle according to claim 2, wherein said output power decrease forecasting means further comprises an atmospheric pressure detecting means.

4. A controlling device for a non-stage transmission for a vehicle according to claim 1, further comprising an increasing fuel use detecting means for detecting an increasing amount of fuel use for acceleration.