DE2133244A1 - ACTUATING DEVICE FOR A COMBUSTION ENGINE - Google Patents

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Patent and

Utility model registration

ROBERT BOSCH GMBH / 7 Stuttgart Actuating device for an internal combustion engine

The invention relates to an actuating device for an internal combustion engine which is used to drive a vehicle and has an between the accelerator pedal and its fuel metering member arranged linkage. ·

In a motor vehicle must when upshifting the transmission The speed of the motor is reduced as a result of the gear jump, d. H. be reduced so that the gears to be engaged have the same peripheral speed. When downshifting, on the other hand, the engine speed must be raised / grounded. This is at Non-synchronized transmissions when downshifting are only possible through so-called double-declutching, when upshifting to protect the Clutch and to achieve short switching times, de-energizing is necessary. Double-declutching or de-energizing is not possible with synchronous gears necessary, but they are more expensive than non-psychronized gears.

- 2 -. 209884/0359

• · t

Robert Bosch GMBH . R. 408

Stuttgart

It is an object of the invention to improve the shifting process for transmissions to facilitate by influencing the speed of the internal combustion engine. '

This is achieved according to the invention in that in the linkage a variable-length member is arranged, which is different according to the required operating states of the internal combustion engine Able to take lengths.

™ This training also includes starting and stopping the internal combustion engine facilitated. The device is particularly suitable for making it easier to switch gearboxes for trucks with partly automatic actuation.

A particularly compact design of the device according to the invention results when in the housing of the hydraulic cylinder one of two of opposite sides acting on it springs loaded piston is guided tightly sliding, one in the direction of the accelerator pedal leading piston rod, and if on the housing of the hydraulic cylinder a push rod is arranged which is in communication with the fuel metering member.

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The control valves are expediently electromagnetic actuatable 5/2-way valves formed, which are connected to a common Pressure medium source are connected and from an electronic, Control unit are controlled, the part of the gear shift device is. . ·. "; ' '

An embodiment of the invention is shown in the drawing. This shows in.

208884 / G3 5S

Robert Bosch GmbH R. 4o8

Stuttgart

1 shows an actuating device shown in a simplified manner

for an internal combustion engine,
2 shows a longitudinal section through a hydraulic cylinder as it is installed in the actuating linkage for the internal combustion engine.

In FIG. 1, 1 denotes an injection pump of a diesel engine which is only partially shown and which has a mechanical controller 2. The adjustment lever 5 of the injection pump is connected to a push rod 4 which has a ball joint 5. The push rod belongs to. like a hydraulic cylinder 6 whose piston rod 7 is articulated with a ball joint 8 to a two-armed lever 9 which is pivotable about a fixed bearing frame 10th A push rod 11 leads from the lever 9 to a two-armed lever 12 which can also be pivoted about a bearing Ij5 fixed to the frame. A push rod 14, which is connected to an accelerator pedal 15 pivotable about a bearing 16, is articulated on the lever 12.

In the hydraulic cylinder 6 there is a continuous longitudinal bore 17, in which a piston 18, to which the piston rod 7 is attached, is guided so as to slide tightly. This has a smaller diameter than the piston, so that an annular surface 19 is formed. The longitudinal bore 17 has an I on each side of the housing of the hydraulic cylinder enlarged bore part 20, 21. The bore part 20 forms with the longitudinal bore 17 a shoulder 21 'and is through a cover 22 closed, which has a bore 25 guiding the piston rod tightly. The cover has a one that extends into the bore part 20 Extension 24, the end face of which has a stop 25 for forms a spring plate 26 on which one end of a spring 27 is supported, the other end of which rests on the cover 22. The spring plate 26 presses the piston 18 over its annular surface 19 to the Shoulder 21.

2098GA / 0359

Bobert Bosch GmbH. R..4o8

Stuttgart

The length of the piston 18 corresponds to the length of the longitudinal bore 17, which-lies in the middle of the housing of the cylinder. A bore 28 to which a line 29 is connected opens into the bore part 20 is, which leads to .e inert 3/2 solenoid valve 30. This . can take two switch positions I and II, of which the switch position II by a spring 31 · Attached to the solenoid valve 30 is a Line 32 connected * which leads to a delivery line 33, which is fed by a pump 34.

The bore part 21 forms a shoulder 35 with the longitudinal bore 17 and is closed by a cover 36. In _e this the push rod 4 is attached. The cover has an extension 37 extending into the bore part 21, the end face of which forms a stop 38 for a spring plate 39 "on which" one end of a spring 40 is supported, the other end of which rests on the cover 36. The two springs 27 and 40 hold the piston 18 in its central position when at rest »

la den'Bohrungteil 21 opens a bore 41 * to the one line 42 is connected to a 3/2-way solenoid valve 43 with two • Switching positions I and II leads. The position II is established by a spring 44. The delivery line leads to the solenoid valve 43 33i> in which a check valve 45 is arranged, which, in Direction to .Magnetvalve43 Mn opens »Both solenoid valves have Connection to a container 46 ". Between the check valve 45 and the pump 34 is connected to a pressure accumulator 47 on the delivery line 33.

If the two solenoid valves 30, 43 are not energized, then there are both by the action of springs 31, 44 in switching position II, in which the solenoid valve 43 is open and the solenoid valve 31 is blocked. As a result, pressure medium can get into the bore part 21 and the Push the piston out against the force of the spring 27 for so long, bit the spring plate 26 rests against the stop 25. This causes the spherical

209884/0369. _ ₅ .

Robert Bosch GmbH ■ R. 408

Stuttgart

joints 5> 8 pushed apart and the adjusting lever 3 of the Injection pump brought to "Stop" position. The throttle linkage has now reached its greatest length. As a result of the check valve 45 this position is retained even in the event of a pressure failure, moreover is the starting of the diesel engine if it starts rolling unintentionally of the vehicle.

To start the engine, both solenoid valves 30, 43 are energized, whereupon they assume switching position I. Via the solenoid valve 30 pressure medium can flow 20 and the piston 17 impinge on the annular surface, whereupon it is pushed against the force \ of the spring 40 until the stop 38 in the hydraulic cylinder in the bore portion. Pressure medium can flow out of the bore part 21 via the opened solenoid valve 43 to the container 46. The distance between the ball joint 5 and 8 is now shortened, and the adjusting lever 3 is in the "Start" position.

When controlling the internal combustion engine with the accelerator pedal 15, only this is the case Solenoid valve 43 energized, d. .H. both bore parts 20, 21 are for Container 46 connected. The springs 27, 40 now hold the piston 18 always in the middle position, so that when the accelerator pedal is pressed, the distance between the ball joints 5 and 8 is always the same.

To increase the engine speed for the gear change when "downshifting" Both solenoid valves are energized as when starting. The distance between the two ball joints is shortened again, and the adjusting lever 3 is brought into the "full load" position when the accelerator pedal is pressed or not. As mentioned at the beginning, this is required to the peripheral speeds of the transmission gears to align with each other. After this process, which lasts only a few milliseconds, the directional control valve 30 is again in the stop position II controlled.

209884/0359

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Robert Bosch GmbH R. 408.

Stuttgart

To lower the engine speed for the gear change when "upshifting" solenoid valve j50 is energized. Both will Bore parts 20, 21 and thus both sides of the piston from the pressure medium applied. Since, however, the free (right) end face of the piston is significantly larger than the annular piston area, there is a differential force on the piston that pushes it against the stop 25. This increases the distance between the two ball joints ^ and the adjustment lever J5 is brought to the "Stop" position. the Mötordrehzähl is now lowered, so that the peripheral speed of the two clutch halves can largely align with each other after changing gears. After you finish this process, you will the solenoid valve j50 is de-energized, the solenoid valve 42 is energized.

The actuation of the solenoid valves JO, 42 takes place via an electronic control unit, which is a Sehalt program for automatic Gear shift is fed.

When the internal combustion engine is switched off, the ignition key is withdrawn, so that both solenoid valves are no longer energized. Pressure medium can thereupon from the pressure accumulator 47 via the solenoid valve flow into the bore part 21 and the adjusting lever 2 via the Move the piston to the "Stop" position.

To prevent the piston 18 from falling over when the pressure drops the spring 27 again in the middle position and thus when it is not actuated The accelerator pedal of the adjusting lever 3 is brought to the "idle" position, the check valve 45 is arranged in the delivery line 33, which prevents the pressure medium from flowing back out of the bore part 21. "- ■; - ■ '

209 8 8 4/0359

Claims (7)

Robert Bosch GmbH R. 4o8 Stuttgart Expectations; (1. J actuation device for driving a vehicle Serving internal combustion engine with a linkage arranged between the accelerator pedal and its fuel metering element, characterized in that that in the linkage (4, 7-11, 14) a variable length Member (6) is arranged, which corresponds to the required I borrowed operating states of the internal combustion engine (l) are able to assume different ^ lengths. 2. Apparatus according to claim 1, characterized in that the variable-length member (6) is a double-acting hydraulic cylinder and that a control valve (50, 43) is assigned to each cylinder side. 3. Apparatus according to claim 1 and 2, characterized in that in the housing of the hydraulic cylinder one of two from opposite sides | Sides acting on it springs (27, 4o) loaded piston (l8) is guided tightly sliding, one in the direction of the accelerator pedal (15) leading piston rod (7), and that on the housing of the hydraulic cylinder a push rod (4) is arranged, which is connected to the fuel flow member (3). -8 209884/0359 Robert Bosch GmbH R. 4o8 Stuttgart. 4. Device according to one of claims 1 to 3, characterized in that that the control valves (20, 43) as electromagnetic actuatable 3/2-way valves are formed, which are connected to a common pressure medium source (34) are connected. 5. Apparatus according to claim 4, characterized in that in the supply line (33) from the pressure medium source (3-4) to the control valve (43)., which faces away from the piston rod (7) A check valve controls the pressure chamber (21) of the hydraulic cylinder (45) is arranged, which is in the direction of the control valve opens out. 6. Apparatus according to claim 5, characterized in that ε.η the supply line (33) a second pressure medium source (4.7) connected. 7. Device according to one dsr claims 1 to 6, characterized in that that the electromagnetically actuated control valves be controlled by an electronic control unit, which fully sees the gear control of the transmission for the motor vehicle. BATH