Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-08-16
1992-03-31
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74878, 74473SW, 74484R, 200 6127, F16H 6102, F16H 5912, H01H 316
Patent
active
050997203
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a control mechanism for an automatic gear-shifting transmission of a motor vehicle according to the preamble of claim 1.
Such a control mechanism has been disclosed in ATZ 85 (1983) 6 from the publications "Development of the 4-Gear Automatic Transmission 4 HP 22 of ZF (Dach)", page 393, and "Use of 4-Gear Automatic Transmissions with Electronic-Hydraulic Control (Lorenz/Larisch)", page 411. In the electronic-hydraulic control mechanisms here described, it is possible to take control of the gear shift of the transmission via a full-power actuator (kick-down). The driver can in this manner effect a downshift, for instance, to obtain the acceleration needed for an overtaking operation.
In addition it has been disclosed in EP-A1 01 44 608 to take into consideration transverse acceleration for control of the shift point.
It has also been disclosed in DE-OS 36 26 100 to use the steering angle on the control column in a control mechanism for an automatic transmission of an industrial vehicle to determine a signal for better control of the automatic changes. Depending on the steering angle and its magnitude, there takes place, according to this prior art, a downshift by one or more gears.
It is true that all these solutions improve the adaptation of the gearshift of an automatic transmission when cornering or overtaking. But the gearshift occurs very late and the devices for determining the information for the control are, in addition, relatively expensive.
Accordingly, an object of the invention is to improve a control mechanism according to the preamble of claim 1. The automatic gearshift can by the invention become still better adapted to the traffic situation, when cornering and overtaking by the simplest possible means.
This problem is solved by the features characterized in claim 1.
The automatic transmissions known already shift to the highest gear at medium speeds and lower power requirements. In these conditions the acceleration potential available is low. The driver wishing to overtake a vehicle running in front of him remains in the same condition until the traffic situation allows him to overtake. Only then do appear the control signals for control of the transmission, which are derived from the power requirement, the steering angle, or the transverse acceleration. After the signals have been processed, the transmission and the engine shift with acceleration to the higher speed. In the meantime, valuable time has been lost for overtaking. If the driver here actuates the kick-down, he has at his disposal the maximum available power and this is only required in emergencies. Customary overtaking operations should not constitute emergency cases. If the original position of the gas pedal is reassumed, the transmission undesirably upshifts while overtaking. The same occurs when other control signals cannot be retained during the whole overtaking operation.
In contrast with the above, in the control mechanism according to the invention there is utilized a control signal which corresponds to the intention of the driver resulting from the existing traffic situation. Before the driver starts to overtake, he is obliged promptly to indicate to the traffic behind him his change of direction by actuating the directional indicators. The control mechanism according to the invention makes use of this actuation for control purposes by shifting the vehicle drive to a condition for higher power or acceleration reserves before power is actually required by operation of the gas pedal. With the available accelerating, the driver can now utilize the power reserve in accordance with the traffic situation without unexpectedly falling back in an unfavorable power range or damaging the engine while overtaking. Besides, there results a harmonious transition to the kick-down position. It is further possible, when turning off at intersections, to effect a downshift for a fluent travel by means of actuation of the direction indicators, without it being necessary to actuate the selector lever to obtain a down
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Herrmann Allan D.
Ta Khoi Q.
Zahnradfabrik Friedrichshafen AG
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