Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Patent
1994-03-28
1995-11-14
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
477110, 180197, B60K 2000, F02D 4104
Patent
active
054661994
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and an apparatus for controlling the engine output of a vehicle fitted with an automatic transmission incorporating torque converter, at the time of moving the shift position (referred to hereunder as selector operation) from a stop range to a drive range.
BACKGROUND ART
Conventionally with vehicles fitted with an automatic transmission incorporating a torque converter, in order to alleviate the gear selection shock and reduce the loading on components such as the differential during selector operation from a stop range (N or P range) to a drive range (D, 1, 2, R range) with the accelerator pedal depressed, or when the accelerator pedal is depressed immediately after selector operation to give a rapid take off, the engine output over the gear change period is reducingly corrected with respect to an output corresponding to the amount of depression of the accelerator pedal.
More specifically, when the engine-rotational speed is above a predetermined value at the time of selector operation, fuel injection amount is reduced or the ignition timing is delayed so as to reduce the engine output. Then, when a time differential of the engine rotational speed changes from a negative to a positive value, that is, when the rotational speed changes from reducing to increasing, it is judged that the gear selecting operation has been completed, and output reduction correction is terminated (see for example Japanese Unexamined Patent Publication No. 61-105228).
With the conventional gear selection control system, when in a stop range with the engine speed reducing from a high speed, then if the accelerator pedal is depressed so as to give a rapid take off immediately after selector operation to a drive range, the following problems arise. That is to say, with the above situation, since as shown in FIG. 6 the engine rotational speed changes to increasing immediately after depressing the accelerator pedal, this gives an erroneous judgement that the gear change has been completed, and the output reduction correction is cancelled. Thus, since the gear selecting operation commences after the increase in engine rotational speed, this gives rise to problems in that gear selection shock cannot be sufficiently alleviated and load on components such as the differential is increased.
In view of the above heretofore encountered problems, it is an object of the present invention to be able to sufficiently alleviate gear selection shock even with the above operation at the time of take off.
It is a further object of the present invention to be able to reduce the load on components such as the differential, thereby facilitating size and weight reduction of such components.
DISCLOSURE OF THE INVENTION
In order to achieve the above objectives, the method and apparatus according to the present invention for controlling the engine output of a vehicle fitted with an automatic transmission comprises, a selector operation detection step or device for detecting a selector operation from a stop range to a drive range of the automatic transmission, a speed ratio detection step or device for detecting a speed ratio of a torque converter output rotational speed with respect to input rotational speed of the torque converter, and an engine output control step or device for controlling an increase in engine output from after a selector operation until a speed ratio detected by the speed ratio detection step or device has fallen below a predetermined value.
With such a construction, selector operation is detected by means of the selector operation detection step or device. Then after the selector operation, there is a lag in the output rotational speed of the torque converter, (the rotational speed of the input side of the mechanical type transmission) with respect to the input rotational speed of the torque converter (the engine rotational speed). This delay correspond to the progress of engagement of the frictionally engaging components inside the mechanical type transmission connected t
REFERENCES:
patent: 5050453 (1991-09-01), Yamaguchi
patent: 5072631 (1991-12-01), Fujimoto et al.
patent: 5184577 (1993-02-01), Kato et al.
patent: 5191953 (1993-03-01), Ito et al.
patent: 5289739 (1994-03-01), Muscaro et al.
patent: 5405302 (1995-04-01), Yagi et al.
Kashiwabara Masuo
Kobayashi Hirohisa
Ta Khoi Q.
Unisia Jecs Corporation
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