JPS6220939A - Driving mechanism for automobile with automatic transmissionfor plurality of shift - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes an internal combustion engine, an automatic transmission with multiple shifts, and an accelerator pedal that serves to regulate a fuel metering mechanism of the internal combustion engine, the accelerator pedal automatically The present invention relates to a motor vehicle drive mechanism connected to a device for generating control signals for a transmission.

In the drive mechanism having the above structure known from U.S. Pat. No. 3,623,383, the hydraulic system appears to be unreliable and mechanically connects the throttle valve of the carburetor of the internal combustion engine and the accelerator pedal. Furthermore, it serves to generate a control signal for the automatic transmission which reproduces the output torque of the internal combustion engine as best as possible.

In order to avoid unnecessarily high fuel consumption caused by pressing the accelerator pedal too quickly, U.S. Pat. What appears is known. Accordingly, the driver
A signal indicates whether it is convenient to move the accelerator pedal relatively slowly or whether it is inconvenient to move the accelerator pedal quickly. It does not have an automatic transmission, however, and braking is dependent on intake manifold pressure.

The invention provides that the drive mechanism for a motor vehicle of the type mentioned at the outset can be constructed in such a way that the accelerator pedal can be pressed relatively slowly and the gearbox can be programmed accordingly to achieve economical or sporty driving. In this case, the task is to impose a high operating force on the accelerator pedal, and at the same time to create a configuration that allows the driver to select the possibility of running so that a switching point with a considerably high rotational speed is selected. It is something.

This object is achieved by the features of patent claim 1, and particularly preferably by the embodiment claim.

According to the invention, therefore, the driver is not only shown by increasing the required accelerator pedal force when operating the accelerator pedal quickly that he is driving in an unfavorable manner with respect to fuel consumption and emissions. Instead, when using hydraulic devices in this sporty driving mode, appropriate shifting processes are introduced for controlling automatic transmissions, for example by taking advantage of the high pressures that occur there.
In the process, the gear is not shifted from shift to shift, but directly, for example from the fourth gear to the second gear.

The control signal thus obtained is fed, for example, to a kickdown manual control for controlling an automatic transmission.

The "selected kickdown" according to the invention also has the additional advantage that in automatic transmissions with freewheeling, the insertion of a lower gear by rapid accelerator pedal operation can be prepared before exiting the freewheeling phase; This allows unnecessary switching processes to be avoided.

Various embodiments of the invention will now be described with reference to the drawings, limiting the essential features of the invention.

First, looking at FIG. 1, when the accelerator pedal 1 or its operating rod 2 is operated, a hydraulic device 4 that acts in a pulling manner and includes a piston-cylinder device 3 is engaged, and this device is located at the left end in the drawing. 5, it is pivotably hung on the body of an automobile equipped with a drive unit, for example. A piston rod 7 supporting the piston 6 and connected to the operating rod 2 is surrounded by a return spring 8.

The piston 6 connects the cylinder 9 to two pressure chambers 10 and 11.
however, these chambers are at least sometimes connected to each other via three bypasses.

In this figure, the outermost bypass contains a constriction point 12 and acts to apply pressure to the pressure chamber 11 when the accelerator pedal 1 is actuated, as long as both other bypasses are blocked, and the degree of pressure applied is It depends on the actuation speed of the accelerator pedal I and thus on the speed of the throttle valve (or control rod of the fuel injection device) which is connected to the accelerator pedal rod 2 at 13. When actuating the accelerator pedal 1 quickly, the constriction point 12 generates a high flow resistance, so that a high pressure is created in the pressure chamber 11, which on the one hand makes the necessary actuating force felt by the driver. As high as
On the other hand, a switch 14 in the control circuit of the automatic transmission, which is not shown but has a well-known structure, is operated so that a switching point for a higher engine speed is selected. If, on the other hand, the accelerator pedal is actuated slowly, the pressure in the pressure chamber II increases only slightly due to the constriction point I2, so that the actuating point is selected such that the changeover from shift to shift occurs, and the driver also increases the pressure only slightly. All you have to do is apply the operating force.

The reverse valve 15 returns the accelerator pedal 1 to its starting position without actually braking by means of the return spring 8, while the overpressure valve 16 limits the maximum actuating force on the accelerator pedal I. In the end position of the accelerator pedal, this valve serves to generate a dead center effect for kickdown.

The bypass containing the constriction point 12 opens into the pressure chamber 11 at a distance from one end of the associated cylinder, which distance, after the communication point has been crossed by the piston 6, in any case therefore does not occur when the accelerator pedal 1 is actuated. A kickdown signal is generated via switch 14 even at low speeds.

In the embodiment according to FIG. 2, the hydraulic system 20 also includes a piston-cylinder arrangement 2I, which, however, is under pressure when operating the pedal.

An accelerator pedal or its rod is pivotally connected to the piston rod 22 at 23, while the cylinder 24 is supported, for example, on the body of a motor vehicle, via a switch 25 with a dead center effect. This switch also serves to control the automatic transmission, which depends on the speed of accelerator pedal operation. The constriction point is here formed at the piston 27 by a clamping gap 26, in which at the same time a check valve 28 is partially installed.
are summarized. The check valve 28 has a return spring 2
9 serves to increase the braking produced by said device 20 when returning the accelerator pedal to its rest position. At 30 the piston 27 has a valve seat for a valve body 31 which is formed integrally with the piston rod 22. This piston rod includes a valve body 31 and a stopper 3.
The piston 27 can move in the axial direction within the range allowed by the distance between the piston 27 and the piston 27. 33 in the piston 27 is an opening through which the hydraulic medium bypasses the constriction point 26 and passes through as unconstricted as possible when the valve body 31 is raised.

The cylinder-shaped insert 34 acts to cover the constriction point 26 when the accelerator pedal is depressed almost completely, so that a hydraulic stop is likewise formed when the piston 27 is moved further, and the movement of the accelerator pedal is then reduced. A kickdown signal is generated by switch 25 regardless of speed.

In FIG. 3, reference numeral 40 indicates a piston having an opening 41 corresponding to the opening 33 in FIG. Here too, the piston 40 forms a valve seat 42, to which is associated a valve body 43 on a piston rod 44, which here is hollow. At the lower end of the piston rod 44 there is an overlord valve, generally designated 45, for limiting the maximum operating force.

As a valve body, the valve 45 includes a ball 46 which is screwed onto the cap 4 by a pressure spring 47.
8, the connection between the interior of the hollow piston rod 44 and the axial opening 51 is broken, but the interior of the hollow piston rod 44 is not connected to the transverse passage 5.
0 to the pressure chamber on the side of the piston 40, and the opening is connected to the pressure chamber at the bottom in the figure. On the other hand, when the pressure in the lower pressure chamber reaches a predetermined pressure, surface bonding takes place.

The piston-cylinder arrangement 60 in FIG. 4 acts on the upper piston rod 62 of the figure via a force sensor 61 of known construction which serves as a control signal generator and supports it against the actuating force applied to the accelerator pedal. The piston 63 generates a pressure in the pressure chamber 64, which pressure, due to the presence of the constriction point 65, is dependent on the supporting force obtained at 61 as well as on the actuation speed of the accelerator pedal. A pressure sensor 66, which detects the pressure in the pressure chamber 64, is therefore useful in order to generate control signals for the automatic transmission. 67 is a check valve for returning the accelerator pedal to its idle position without braking; 68
is an overpressure valve.

The further the piston rod 62 enters the cylinder 69, the more
The volume available for the pressure medium becomes smaller. To compensate for the volume, a piston 71 that is slidable against spring force and atmospheric pressure serves.

This compensation device 70/71 supports and at the same time compensates for the return spring of the accelerator pedal.

In all cases, the control device for the automatic transmission is ensured so that the required operating force for the accelerator pedal depends on its operating speed.

[Brief explanation of drawings]

1 to 4 each show an embodiment of a drive mechanism according to the present invention. Reference numbers in the figure ■... Accelerator pedal, 3... Piston cylinder device, 4... Pressure medium device, 6... Piston, 12... Narrowing point, 15... Check valve , 1
6... Overpressure valve, 20... Pressure medium device, 22...
・Piston rod, 24---Cylinder, 25...Switch, 26...Narrowing point, 27...Piston, 28...Check valve, 30...Valve seat, 31.
... Valve body, 34... Cover, 44... Piston rod, 45... Overpressure valve, 60... Piston-cylinder device, 6J... Force measuring device, 62... Piston rod, 66 ...Pressure sensor, 70.7] ...Elastic reservoir

Claims (13)

[Claims] (1) having an internal combustion engine, an automatic transmission having multiple shifts, and an accelerator pedal serving to regulate the fuel metering mechanism of the internal combustion engine, the accelerator pedal generating a control signal for the automatic transmission; A drive mechanism for a motor vehicle, characterized in that the device (4) generates a control signal dependent on the respective actuation speed of the accelerator pedal (1). (2) at least one constriction point (12) for said device to generate a pressure that increases with the operating speed of the accelerator pedal (1) and at the same time increases the required operating force; and a piston-cylinder arrangement (3). and a pressure medium device (
4), and further comprising a control signal generator operated by this pressure. 3. Drive mechanism according to claim 2, characterized in that the constriction point (12) is in a bypass to the piston (6) of the pressure medium device (4). (4) The bypass is a piston-cylinder device (3)
4. A drive mechanism according to claim 3, characterized in that the drive mechanism communicates with the drive mechanism at a distance (a) from its pressure-side end. (5) The drive mechanism according to claim 2, characterized in that the constriction point (26) is provided in the piston (27) of the pressure medium device (20). (6) characterized in that a cover (34) is provided in the cylinder (24) of the pressure medium device (20) for a constriction point (26) which acts close to the end of the accelerator pedal; A drive mechanism according to claim 5. (7) A check valve (28) is provided in the piston (27), and the valve body (31) is pressed against the spring force so that it can slide toward the piston (27) in the axial direction. Media device (
20), and its valve seat (30) is arranged on the piston (27). Drive mechanism. (8) The pressure medium device (20) is arranged between the accelerator pedal and a switch (25) with a dead center effect serving as a control signal generator. The drive mechanism according to one of items 7 to 7. (9) A pressure medium device is provided between the accelerator pedal and a force measuring device (61) serving as a control signal generator. The drive device according to item 1. (10) The pressure medium device as a control signal generator includes a pressure sensor (66) for the operating speed-dependent pressure occurring therein. The drive device according to item 31 of item 7. (11) Claims 2 to 10, characterized in that an overpressure valve (16) for limiting the maximum operating force is arranged parallel to the constriction point (12). The drive mechanism according to item 1. (12) The drive mechanism according to claim 3 or 10, wherein the overpressure valve (45) is provided within the piston rod (44). (13) constriction point (12) for returning the accelerator pedal (1) to its rest position without significant braking;
13. The drive mechanism according to claim 1, wherein a check valve (15) is arranged in parallel to the drive mechanism. (14) Piston-cylinder device (6
0) is provided with elastic reservoirs (70, 71) to compensate for the volume fluctuations caused by the movement of the piston rod (62).
) The drive mechanism according to any one of claims 2 to 13, characterized in that the drive mechanism includes: