Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1993-12-21
1996-08-27
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477121, 477155, 36442601, F16H 6116
Patent
active
055495192
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a method of controlling an automatic transmission of a motor vehicle which prevents shifting of the transmission in response to defined operating conditions of the vehicle as known from DE-39 22 040 A1.
Conventional automatic transmission controls of motor vehicles powered by internal combustion engines generally initiate shifting into a higher gear (reduction in translation) if the amount of force exerted on the gas pedal is reduced. However, this is not always desirable when driving through a curve or when braking, since such changes in load could possibly result in unsafe driving conditions or one or more reductions in gear when the motor vehicle accelerates again, due to greater force on the gas pedal.
From German patent document DE-33 41 662 C1, it has become known in connection to avoid this upshifting in a curve by determining the lateral acceleration of the motor vehicle. However, this measure only makes it possible to avoid upshifting in a curve.
In order to prevent upshifting even when approaching a curve, in targeted manner, the method for control of an automatic transmission pursuant to DE-39 22 040 A1 determines the gas pedal change velocity, and a signal to prevent an upshift process is derived if idle mode is detected. Thereupon, upshifting is prevented until traction mode occurs again and a predetermined period of time has elapsed.
In DE-39 22 051 A1, it is additionally provided that this period of time be made dependent on another parameter (driving activity), which is derived from one or a combination of several operational or driving parameters of a motor vehicle and evaluates a driving style of a driver or a prevailing traffic situation.
Proceeding from this state of the art, it is the object of the invention to create a method for control of an automatic transmission of a combination of several operational or driving parameters of a motor vehicle and evaluates a driving style of a driver or a prevailing traffic situation.
Based on this state of the art, it is the object of the invention to provide a method for control of an automatic transmission of a motor vehicle, which is further improved particularly with regard to shifting behavior before curves and while braking.
The object is accomplished according to the invention by activating an upshift prevention mode of the vehicle transmission in response to the entry of the vehicle into an coasting mode. This mode is continued for a preset time period T1 during which if the vehicle again enters the coasting mode, the upshift preventing mode is continued until expiration of a second preset time period T2.
The advantages of the invention primarily consist of the fact that a method for control of an automatic transmission of a motor vehicle is created, in which the shifting behavior, particularly before curves and while braking, is further improved.
By having a renewed delay of upshifting after recognition of a traction mode during the first time period, within which renewed delay upshifting before curves is avoided, the driver of a motor vehicle having a transmission equipped with such a control can temporarily give gas even before a curve, without causing an undesirable upshifting. In this manner, incorrect assessments by the driver with regard to approaching a curve in traction or idle mode are tolerated without negative effects on the overall driving behavior of the motor vehicle.
In a further embodiment of the invention, it is provided that after the end of the prevention of upshifting, large gear jumps (over several gear levels) are avoided, in that these gear levels are carried out step by step, with intermediate elapse of certain additional time periods.
Likewise, automatic downshifting (increase in translation) can also be carried out when braking the motor vehicle, if certain conditions are present; adherence to the conditions thereby guarantees safe operation of the motor vehicle. Thus, particularly monitored factors are that the lateral acceleration is not too high
REFERENCES:
patent: 5025684 (1991-06-01), Stehle et al.
patent: 5097725 (1992-03-01), Sawa
patent: 5362286 (1994-11-01), Satoh et al.
Petersmann Joseph
Seidel Willi
Dr. Ing. h.c.F. Porsche AG
Kwon Peter
Marmor Charles A.
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