Driving-speed adjusting arrangement

Details Driving-speed adjusting arrangement Driving-speed adjusting arrangement

1987-12-21

1989-10-10

Chin, Gary

Boots, shoes, and leggings

123352, 180179, B60K 3100

Patent

active

048736406

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention starts out from a vehicle-speed adjusting arrangement for motor vehicles. This adjusting arrangement functions in combination with a driving-speed control unit for providing the desired value of the driving speed. The adjusting arrangement has at least two switching contacts wherein the driving speed is increased when one of the contacts is closed and the driving speed is reduced when the other contact is closed. The adjusting arrangement can have further switching contacts which, for example, can be utilized for switching in or switching out the driving-speed control unit or for retrieving a desired speed previously stored. Since driving-speed control units automatically cease to function below a minimal speed, for example at 40 km/h, for reasons of safety, the switching contacts of the driving-speed adjusting arrangement are freely accessible below the minimal speed and can be utilized for serving other functions.


SUMMARY OF THE INVENTION

The inventive use of the driving-speed adjusting arrangement below the minimum speed as an operating element for other functions affords the advantage that input elements such as switches or potentiometers can be dispensed with. An application in a motor vehicle having a combustion engine comprises the presetting of the desired value of the no-load speed of the engine. Especially with respect to commercial vehicles, there is the desire also to provide the driver with a possibility of adjusting the no-load speed in addition to the automatic no-load speed control. In this way, the driver can, for example, accelerate the use of the heating operation after the start or, when the mechanical no-load control unit malfunctions, the driver can control an emergency operation. Furthermore, a use of the switching contacts of the driving-speed adjustment arrangement for electrically displacing the rearview mirror or the driver's seat is possible, since these adjustments preferably take place when the vehicle is stationary. A further application possibility is the presetting of a rotational speed limit of the drive engine as well as of a highest speed
To prevent erroneous operations, it is especially advantageous to provide a dead zone in which the driving-speed adjusting arrangement ceases to function. The contacts of the adjusting lever are separated from the additional electrical equipment beneath a first threshold of the driving speed which corresponds to the minimum speed in the controlled operation and above a second threshold of the driving speed. The two threshold values are permanently set and lie, for example, at 40 km/h and 20 km/h. Above the first threshold, the driving-speed adjusting arrangement operates exclusively on the driving speed regulating unit. Beneath the second threshold, analog or digitally operating circuit equipment is controlled with the switching contacts. In the simplest case, the on-off function of the switching contacts is used to directly switch on and off electrical units such as electrical motors.
A controllable ramp generator is suitable for changing an analog desired value by means of electrical switching contacts. In the neutral position of the driving-speed adjusting arrangement, the output signal of the ramp generator remains at a constant value. When one or the other of the switching contacts is actuated, the output signal drops or rises until the driving-speed adjusting arrangement is again brought into the neutral position. Exceeding or dropping below permissable desired values by too long an actuation of the adjusting arrangement prevents a limit switching. The adjusted desired value is useable for example as a control signal or as a command signal of control circuit.
Digital circuits can be advantageously driven with the switching contacts of the adjusting arrangement. An up-down counter which is appropriately driven can be used for the digital desired-value presetting. As is the case with analog circuits, a limit of the adjustable values is purposeful also with the digital circuits. The digit

REFERENCES:
patent: 4510899 (1985-04-01), Macy
patent: 4606425 (1986-08-01), Hayashi et al.
patent: 4737913 (1988-04-01), Blee et al.

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