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Automatic automobile transmission with variable shift pattern controlled in response to estimated running load

a technology of automatic transmission and estimated running load, which is applied in the direction of mechanical equipment, transportation and packaging, instruments, etc., can solve the problems of enhanced and achieve the effect of enhancing the drivability of automobiles and enhancing the fuel consumption of automobiles

Inactive Publication Date: 2007-06-05
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]In operation, the running load (and the vehicle weight) are estimated, and the shift operation is performed in conformity with the vehicle weight and the running load. Therefore, the optimal shift pattern is formed in accordance with a driving environment such as a mountain path, to enhance the drivability of the automobile. Moreover, on a flat road, the fuel consumption of the automobile is enhanced.

Problems solved by technology

Moreover, on a flat road, the fuel consumption of the automobile is enhanced.

Method used

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  • Automatic automobile transmission with variable shift pattern controlled in response to estimated running load
  • Automatic automobile transmission with variable shift pattern controlled in response to estimated running load
  • Automatic automobile transmission with variable shift pattern controlled in response to estimated running load

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Embodiment Construction

[0036]Now, embodiments of the present invention will be described with reference to the drawings. In the ensuring description, an expression “change gear ratio” or “gear ratio” shall mean the product between the gear ratio of a transmission and that of a final drive.

[0037]The schematic construction of an automatic transmission control system for an automobile in one embodiment of the present invention is illustrated in FIG. 1.

[0038]Throttle valve opening (TVO) sensing means 101 senses a throttle valve opening 121 in the automobile, which is delivered to vehicle weight estimation means 106, engine-generated torque estimation means 1001 and gear position determination means 109.

[0039]Acceleration sensing means 102 senses the acceleration 122 of the automobile, which is delivered to the vehicle weight estimation means 106 and load estimation means 110.

[0040]Vehicle speed sensing means 103 senses the vehicle speed 123 of the automobile, which is delivered to the vehicle weight estimatio...

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PUM

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Abstract

An automatic transmission control system for an automobile, comprising a vehicle weight estimation unit which estimates a vehicle weight of the automobile a torque estimation unit which estimates an output torque, an acceleration input unit which accepts an acceleration signal; a load estimation unit (110) which estimates a running load from the estimated vehicle weight, the estimated output torque and the accepted acceleration; a memory which stores a plurality of shift schedules therein; and a gear position determination unit (109) which includes the memory, and which selects one of the shift schedules in accordance with the vehicle weight and the estimated running load, so as to determine a gear position of an automatic transmission of the automobile in conformity with the selected shift schedule. An exact shift operation conformed to the vehicle weight and the running load can be performed, and an enhanced fuel consumption can be attained.

Description

[0001]This application is a continuation of reissue application Serial No. 09 / 064,765, filed Apr. 23, 1998, now abandoned.BACKGROUND OF THE INVENTION[0002]The present invention relates to transmission control systems for automobiles.[0003]A prior-art transmission control system for an automobile is so constructed that a vehicle speed and a throttle valve opening are sensed as electric signals, and that a predetermined shift gear corresponding to the current values of the vehicle speed and the throttle valve opening is selected on the basis of a shift pattern which is preset, with the vehicle speed and the throttle valve opening as variables. Herein, a plurality of such shift patterns are set beforehand, and one of them is selected by the manipulation of the driver of the automobile.[0004]In another transmission control system, the shift patterns are automatically selected and changed-over in accordance with the driving operation of the driver.[0005]The control of a transmission in t...

Claims

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Application Information

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IPC IPC(8): B60K17/06
CPCF16H61/0213F16H2061/0227F16H59/52F16H59/48
Inventor OHNISHI, HIROSHIKITANO, KOUJIKAYANO, MITSUOKURIHARA, NOBUO
Owner HITACHI LTD
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