SE457940B - DEVICE FOR SETTING THE DRIVING SPEED OF A MOTOR VEHICLE - Google Patents

Description

457 940 2 is pivoted at a certain angle, the throttle 1 is also pivoted in a corresponding manner, with or for example as shown in Figs. 1 and 2. The adjusting device can for instance consist of a stepping motor, which via the described transmission chain changes the throttle 'in small steps . without gearing. As can be seen from Fig. 2, an ipneumatic servomotor 7 is held by means of its retracted position, and 10 in a position so that its coupling rod 8 holds two further levers where they can not exert any action on the throttle 1.

Inside the servomotor 7 are arranged springs, which partly strive to move the servomotor to its extended position when the negative pressure ceases to act, and partly strive to force the throttle to the idle position.

As can be seen from Fig. 3, in this aerated state the servomotor has moved the levers 9 and 10 to a position where a carrier 11 fixedly connected to the lever 9 is connected to a corresponding shoulder on the lever 3 of the throttle 1. The spring forces for the throttle to idle mode.

As can be seen from a comparison between Figs. 2 and 3, when the servomotor 7 is under negative pressure, the lever 9 is in such a position that it does not abut against a thickening 12 on an operating line 13, while with an aerated servomotor 7 it abuts against the thickening 12. The control line 13 is connected to the accelerator pedal.

This means that movements of the accelerator pedal with aerated servomotor 7 can be transmitted to the throttle g1 via the lever 9 and the lever 3 against the action of the springs in the servomotor 7. When the electric setting device falls off or is switched off, the vehicle engine can be mechanically controlled directly with the accelerator pedal . In the event of disturbances, the vehicle can thus in future be normally operated by the driver.

As can be seen from Fig. 3, the negative pressure servomotor 7 is connected to a source of negative pressure 14, for example the intake pipe of the vehicle engine at a carburettor engine, through a non-return valve 15 and a vent valve 16. If, for example, the setting device 6 falls off, eg due to power supply faults or similar faults, or for example by intentional disconnection, it can be arranged with suitable electrical connection that the aeration valve 16, which has the shape of a solenoid valve, aerates the servomotor 7 and thereby causes the throttle to be moved to its idle position, whereby according to the embodiment further the advantage that the accelerator pedal is mechanically connected. The non-return valve 15 ensures that a normally built-up negative pressure in the servomotor 7 cannot be affected by disturbances, eg a pressure increase in the intake pipe does not already have a separate source of negative pressure, no such need be provided either, but you can use the negative pressure in the intake pipe t'ar out a very small part of the negative pressure interferes with the operation of the engine. negative pressure. If it said that it does not The invention also gives the following gain: The setting device 6 can be designed as a stepper motor, since no feedback signal is needed, i.e.

Claims (5)

3 457 94n it is a matter of pure control and not any regulation. The electrical feedback signaling, for example by means of a potentiometer, can be omitted, which has the consequence that the service life increases significantly and the reliability increases because: the error possibilities decrease, which is due to the smaller number of components. Claims: Device for setting the driving speed of a motor vehicle, with an accelerator pedal, with an electric irrigation device (6) controlled by the accelerator pedal for the throttle of the vehicle engine (1), and with a force, for example in the form of a spring, which acts on the throttle ( 1) in the direction of its idle position, characterized in that it comprises an element (7) which, during normal operation, cancels out the force which acts on the throttle (1) in the idle direction, and a further device (16), which in the event of a fault in the electric adjusting device drive shaft (6) renders the element (7) ineffective, that a mechanical connection (11, 12, 13) with a releasable coupling (9, 12) is arranged between the accelerator pedal and the throttle (1), and that the element (7) ) which cancels the force acting on the throttle (1) is made to fl at the same time as the force is cancelled break the coupling (9, 12) - Device according to claim 1, characterized in that the element consists of a pneumatic steel motor (7) and the further device of a solenoid valve (16). Device according to claim 2, characterized in that the pneumatic actuator (7) is connected to the suction pipe negative pressure of the vehicle engine or some other source of negative pressure (14), and that the solenoid valve (16) acts as a vent valve. ' 4. Device according to claim 2, characterized in that a spring acting on the throttle (1) in the direction of the idle position is arranged inside the pneumatic actuator motor (7). Device according to claim 2, characterized in that the mechanical connection comprises a mariuverliiwa (13), which is arranged between the accelerator pedal and the throttle (1), which line is connected to the throttle by a carrier (11, 12), and that the carrier is connected to the pneumatic actuator (7) in such a way that it is deactivated when the actuator motor (7) cancels the force.