DE2757242A1 - STARTING AND STOPPING DEVICE, ACTUATED BY A MAIN SWITCH USING A KEY, FOR VEHICLES WITH AN AIR COMPRESSING FUEL INJECTED ENGINE - Google Patents

Description

Daimler-Benz Aktiengesellschaft Daim 11 724/4 Stuttgart-Untertürkheim 27 572 A 2

"Starting and stopping device for with a main switch by means of a key an air-compressing injection internal combustion engine intended motor vehicles "

The invention relates to a through a main switch Starting and stopping device that can be operated by means of a key for with an air-compressing injection internal combustion engine intended motor vehicles, in particular commercial vehicles, with shut-off elements which act on the regulation of an injection pump and can be actuated by pressure medium, and with optionally an engine brake that can be actuated via a switch.

For reasons of safety and comfort, with air-compressing Passenger cars equipped with injection internal combustion engines and utility vehicles the key activation and deactivation strived for.

The advantages lie in the ease of use when starting and turning off the internal combustion engine. There is only one operation of the key in the main switch (with PKVs common for a long time). Furthermore, if the key is removed, unauthorized or unintentional starting by pushing the Prevents the vehicle on a slope.

Devices of the type mentioned at the outset require shutdown switching elements due to the fact that they are arranged on the injection pump complex special designs of the injection pump, e.g. under-

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Pressure switching devices on the cone of the car injection pumps or electro-hydraulic shut-off devices on the injection pump housing. In addition to the not inconsiderable expense, it is also a disadvantage that the operated with negative pressure Facilities the Abstellelcmente - when the internal combustion engine is shut down - remain constantly switched on and that with the electrohydraulic shut-off devices, the internal combustion engine is only operated when the shut-off elements are switched on is possible. Due to disturbances in the electrical part of the circuit, e.g. frayed cables, the internal combustion engine would are unexpectedly put out of operation, which is associated with considerable dangers, especially during overtaking maneuvers were.

The invention is now based on the object of a simple starting and stopping device for with an air-compressing An internal combustion engine intended for motor vehicles create that eliminates the aforementioned deficiency.

The object is achieved according to the invention in that by an electrical control circuit having the main switch in the starting and stopping device from an internal combustion engine side Control signal-dependent shutdown elements can be influenced in such a way that when the internal combustion engine is switched off the cone of the injection pump is initially in the "Stop" position, but "when the internal combustion engine has come to a standstill" goes back to "idle".

In a preferred embodiment of the invention, the control signal a changeover switch that is interposed in the electrical control circuit and is dependent on the oil pressure of the internal combustion engine be provided.

There are no changes due to the measures according to the invention

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Required for the usual spray pump designs.

In an advantageous embodiment of the invention, it is never possible to stop an electromagnetic 3/2 Vege valve depending on the position of the changeover switch must be provided, rins with a closed control circuit with the controller of the Compressed air cylinder connected to the injection pump, which puts the Hegler on "stop".

Another feature of the invention is that during the starting process the changeover switch only closes the control circuit when it is reached interrupts a certain oil pressure and thus releases the Ptart amount.

By the control signal on the bronnkrnftniaschiuenside, in this one If the pressure falls through, the air cylinder in the Regulation switched off when the internal combustion engine is at a standstill, resulting in an early emptying of the compressed air brake system prevented by possible leaks in the compressed air system will.

Oa when starting the machine with reaching an over _; If the oil pressure changeover switch interrupts the flow of electrical current to the electromagnetic 3/2-way valve when the oil pressure is low, a sudden shutdown of the engine due to an unforeseen faulty power cable in the electrical control circuit is excluded.

For motor vehicles equipped with engine brakes, will continue suggested that a mechanical 3/2 1.ege valve in the compressed air line leading from the 3/2-Vege valve to the compressed air cylinder is interposed, which is provided for the actuation of the engine brake.

It is also provided that the electromagnetic 3 / 2-1. ege-Veiitil regardless of the position of the mecli toi -her 3/2 Vegc valve works. - 6 -

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The subject of the invention is in the drawing based on a Embodiment shown schematically! · And in the following described in more detail.

tine key] -starting and stopping device 1 for one with A utility vehicle equipped with an engine brake consists of an electric one Control circuit 2 and a pneumatic control circuit 3 interacting with it

A battery Ί, a is connected to the electrical control circuit 2 Main switch 5t that can be operated by a vehicle key one that interrupts the control circuit 2 from the oil pressure of the internal combustion engine Influencable changeover switch C and an electromagnet 7 of a 3/2-V.ege-Ven ti 1 es 8 connected.

Dna electromagnetic 3/2-vege valve 8 is just like that 3/2-Vege valve 10 for the motor brake is interposed in the pneumatic control circuit 3.

Heide 3/2-Vege-Valves 8 and 10 are connected via a pressure line 11 to a compressed air cylinder i'l which can be actuated by a regulator 12 of the injection pump 13 on the one hand and to a compressed air cylinder l6 which can be actuated by an exhaust flap 15 on the other hand.

The compressed air cylinder marked with ΐΊ is part of an known and not shown adjusting device (DT-I'S 2 322 025), which from the accelerator pedal via the regulating rods 17 can be operated.

The switching of the main switch 5 dependent starter is not discussed in more detail «because it does not deviate from known designs.

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The mode of operation of the key initiation and deactivation the driver is described as follows:

Starting the internal combustion engine becomes the vehicle key of the main switch 5 turned to the "Start" position. The ignition is operated. As long as the oil pressure has not yet built up, the electromagnet of the 3/2-way valve 8 is energized and the The cone 12 of the injection pump 13 is set to "Stop". In the Positions 1, 11, 111 of the bowler 12 shown in the drawing mean stop, idle and full load. As soon as a certain oil pressure is reached, the oil pressure changeover switch 6 switches from position "u" (depressurized) to position "b" (pressure). Control circuit 2 is interrupted and the 3/2 \ .ege valve 8 returns to the starting position shown. The pressure line 11 is at a point l8 with the atmospheric Air in connection. Since now the compressed air cylinder l'i or the detention cylinder are no longer under pressure, the bowler 12 pivots from the stop position (I) to start or full load (III). The internal combustion engine is put into operation.

The vehicle key - after it has been released it clicks into place into the "drive" position by spring force.

To switch off the internal combustion engine, the vehicle key of the main switch 5 is brought to the position "Stop ¹¹ " shown. The circuit is now no longer interrupted, since the oil pressure changeover switch 6 also initially remains in position "b" (pressure) the controller 12 is set to Stop (I), whereby the power injection is interrupted.

As soon as the internal combustion engine inevitably comes to a standstill has come, the changeover switch 6 switches as a result of Reduce pressure to "a" (depressurized), the circuit is interrupted again and the pressure line is ventilated again. this

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is advantageous in that the compressed air cylinders Ik and IC are not continuously subjected to compressed air when the internal combustion engine is switched off.

The 3/2 Vege valve included in the pneumatic control circuit 3 10, which is located between the valve 8 and the compressed air cylinders l'i and l6, is controlled by the foot switch 9 to adjust against the force of a spring 19. This 3/2-way valve 10 has no effect on the operation of the first 3/2-cone valve in either the one or the other position 8th.

When the foot switch 9 is actuated, both compressed air cylinders 1Ί and 16 are acted upon, of which the compressed air cylinder ΐΊ denotes Regulator 12 and the air cylinder 16 the exhaust flap 15 adjust.

If necessary, a relay 21 controlled by the alternator 20 can be interposed in the electrical control circuit 2 in order to avoid the sluggish movement of the control rod of the injection pump during a cold start. Alternator 20 and relay 21 are indicated by dash-dotted lines in the circuit.

During the starting process, relay 21 - regardless of the oil pressure - keeps the circuit open from the start on as long as until the operating voltage (at approx. 400 rpm of the internal combustion engine) of the alternator 20, the relay 21 switches.

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Claims (3)

. ^ By a llavij tsehn 1 ter betatigb.ire by means of a key Starting and stopping device for with an air compressor Motor vehicles intended for internal combustion engines, especially commercial vehicles, with nuf dis hegulation a l-i npprit ζ pump acting by pressure medium be ta tigbaroii Abstel 1 elements and, if necessary, one The engine brake can be actuated via a filter, thereby characterized in that the main switch by a (5) nufweisenden electrical control circuit (2) in the Anltiss- uiiel shutdown device (l) used by an internal combustion engine its control signal-dependent shut-off elements can be influenced in such a way that when the engine is switched off the Hegler (12) of the injection pump (13) initially to the "btop" position, but when it has come to a standstill the internal combustion engine goes back to "idle". ?. Device according to Claim 1, characterized in that a changeover switch (6) which is dependent on the oil pressure of the internal combustion engine is provided as a control signal in the electrical control circuit (?). 3. Device according to claims 1 and 2, characterized in that a storage element on the position of the changeover switch (6) dependent electromagnetic 3/2-way valve (8) is provided, which when the control circuit (2) is closed with the controller (12) - .L - L'nii.i Ij 7 2 Vl dor Liiispri t ^ j-.uir.pc vorbu. «which Prucklu ftüyl iridor (1 Ί) !, s.iuf sclngt, * eicl.cr sets the reeler {12) to "L top" «J..cl 'at .". Iispri c' .ox »1 l> i a 3» d π t) urc Ii .ti,?:) E ι; \> «·. Eic 1. η:; t , rf, - ^ f. vilhrcnd ί! ί. · κ i tnr tvorgaii c'iir '■ v.chiml i ciinl ti.-r (C?;' cii ^c tcucrl.reis (Γ) only at Lr-π · i tl.cu c Ίΐ; :: ί ben £ !! '. in · ten'. h.'rue'r ts utitcrbricVt mc! fcot.ii t ' ^: . ii E I 11 tine; - ^ cfr ο i £ i ": t. ν ■ 'Μ "! i.lii" jii ^ si .-. cii don ..i.spriiclion 1 biy':, >. \ adurch se K υ = »n - ' ^! -? ic I · i! ct, d, if »in the V) n> ~} ./ 2- \ · egf; -Vv: til (P) /ur.i '.'ruLUafl ^ liuriti fiil.rr iden DrucKluftl ^ itai. ^ (ti ) ο i ;: ι / -clii »nj fch be lit t ii.bn re f 3/2 - '.« ge-V ₁ ! iil (if) / w>; c: .i ii "· ^ cii.I te ί is, el.-» * fvr dio ^ ctii il.T? ■ -c. t (.rbi-c-ritt before ^ nsebcn ijv. ? iiiriclaui-.i; ; ι ..: _ ίι <\ cu , '. iispri ^ Vcn 1 1> is T »d η Λ ufc Ii is ο ket; ii i- eic I η c L, rinl ". d;> sc 1 cktroniagi.p ti: ehe 3, ': -'.? gc-Vo, ti 1 (P) un.d'hni - ^ i S of rlrr -division of the iiiucho li-ci.eii 3 / 2-1 _t ire-Vc-. tiles (l) acts. 909827/0073 ORIGINAL BATHROOM