DE2015487A1 - Ignition point adjuster for internal combustion engines - Google Patents

Description

Patent attorney

1 BERUN 19

BoUvaralieea W / Vh-2625

Tel.'SÖ4428S 25 3.70

General Motors Corporation, D e t rο i t, Mich., YiSt.A.

Ignition point adjuster for Brecinkraftmasehineti

! The invention fee applies to an ignition timing adjuster for internal combustion engines that drive a gearbox, with one attached to the intake manifold of the internal combustion engine connected suction pressure actuator to adjust the ignition point depending on the pressure in the suction pipe.

In known devices in which the suction pressure servomotor cooperates with the ignition distributor of the internal combustion engine, the suction pressure is behind the throttle valve sensed the internal combustion engine and fed to the suction pressure motor, which acts on the breaker plate of the distributor, to adjust the ignition point.

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By bringing the ignition point forward depending on the intake vacuum, fuel consumption and a flawless running of the internal combustion engine is achieved in an optimal manner.

It was found that in the exhaust gases, among other things, desired Components such as unburned hydrocarbons and nitrogen oxides can be significantly reduced if the Ignition timing adjustment by the suction pressure control engine is suppressed when the prime mover is in the gearbox driving the low gears or when the prime mover idles or is decelerating, with economy the fuel consumption and the flawless operation of the internal combustion engine are maintained without significant loss can be when the suction pressure servomotor adjusts the ignition point only effected when the prime mover drives the gearbox in a high gear.

The invention is therefore based on the object of achieving a more satisfactory composition when operating in low gears of the exhaust gases, while operating in high gears an economical fuel consumption and a uniform running of the internal combustion engine remains guaranteed.

The object set is achieved according to the invention in that in the connection between the suction pipe and the suction pressure servomotor, a valve is provided which is at

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Setting a low gear in the gearbox closes and when setting a high gear in the gearbox is open.

In a further embodiment of the invention it is provided that the connection between the suction pipe and the Suction pressure actuator with closed throttle valve upstream and with open throttle valve downstream of the Throttle valve opens into the intake manifold, so that the suction pressure actuator motor suction pressure only when the throttle valve is open and switched on high gear in the gearbox is fed. Finally, it is advantageous if the valve by a Magnet is actuated in the 'closing direction', which when the low gear in the gearbox is energized.

An exemplary embodiment of the invention is shown in the drawing. the drawing is

Fig. 1 is a schematic representation of an internal combustion engine with timing according to the invention,

FIG. 2 shows a section along the line 2-2 in FIG. 1 by the valve designed as a solenoid valve on a larger scale, Fig. 3 is a section along the line 3-5 in Fig. 1 through

the suction pressure actuator in an enlarged view. Standards and

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Pig. 4 a section along line 4-4 in Pig,

An internal combustion engine 10 is provided with a carburetor 12 which supplies an intake manifold 14. In the suction pipe 14 - is A throttle valve 16 is provided so that it can pivot about an axis 18. One branches off from the suction pipe 14 via an opening 20 Line 22-24 off. The opening 20 lies on the upstream one Side of the throttle valve 16 when this, as shown in the drawing, is closed, and when you open the Throttle valve on the downstream side, so that they then the suction pressure in the intake manifold 14 downstream of the throttle valve 16 feels.

Line 22-24 leads to a suction pressure actuator 26, which is arranged on the distributor 28. A solenoid valve 30 is provided in this line 22-24. The valve consists of two elongated housing parts 32 and 34 »where each part contains an inlet port 36 or 38 at its outer end. Between the two inlet ports there is one in the transverse direction horizontal connecting piece 40 is provided. The line 22 coming from the suction pipe 14 is connected to the nozzle 36, the connecting piece 38 leads into the open air and the connecting piece 40 leads to the suction pressure servomotor 26. In the connecting piece 36 is a Valve seat 42 is formed, while a valve seat 44 is provided in the connecting piece 38.

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ORIGINAL INSPECTED

A magnetically movable valve member 46 is located in the housing parts 32 and 34 between the valve seats 42 and 44 movable. As Mg. 4 shows, the central part of the valve member 46 is substantially square in cross section and has rounded corners 50 which bear against the wall of the housing part 32. It will be through this Channels 52 are formed through which the suction pressure from the connecting piece 36 can reach the connector 40. ! The valve member 46 has tapered ends 54 and 56, respectively, with a resilient Material are clad and with the valve seats 42 resp. work together.

The housing part 32 is surrounded by a magnetic coil which is connected to a voltage source via a conductor 60 62 is connected via the ignition switch 64 of the internal combustion engine. The other conductor 66 of the ignition coil 58th is via a switch 68, which opens when a pressure in the hydraulic fluid is sensed, which indicates the engagement of a clutch for the high gear in a gearbox 70 indicates. In the absence of such pressure, the circuit is earthed. That Change gear 70 contains several gears in the usual way, which optionally maintained the gear ratio between an input shaft 72 i driven by the prime mover and an output shaft 74. '-

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The in Flg. 3 illustrated suction pressure servomotor 26 contains a membrane 76, which in the direction of retarded ignition is loaded by a spring 78. If suction pressure signals are sent to suction pressure servomotor 26 via lines 22-24, so they act on the left side of the membrane 76 and adjust it against the bias of the spring 78 in the direction on pre-ignition.

When the magnet is de-energized, as shown in FIG. 2, the opening 20 in the suction pipe 14 prevails when the throttle valve 16 is open, the suction vacuum, which is generated via the line 22, the nozzle 36, the valve seat 42, the channels 52, the connecting piece 40 and the line 24 to the suction pressure servomotor 26 is conducted in order to bring the ignition point forward achieve. If the throttle valve 16 is closed, there is essentially outside air pressure at the opening 20 in front of the throttle valve 16, so that no vacuum signal is fed to the suction pressure servomotor 26. Is one of the low gears of the gearbox 70 switched on, the switch 68 causes the solenoid 58 to be excited, causing the valve member 46 to counteract the force of a spring 80 is moved downwards so that the end 54 of the valve member 46 closes the valve seat 42, while valve seat 44 is exposed. By closing the valve seat 42, the connection to the suction pipe 14 is established to the suction pressure motor 26 prevented. Instead, the

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Suction pressure actuator 26 with the outside air via line 24, the port 40, the open valve seat 44, and the port 38

tied together. '

When the gearbox is switched by hand, the switch 68 is actuated instead of hydraulically Pressure directly by operating the gearshift, lever.

Likewise, the solenoid valve 30 can by others Valve types are replaced, provided that they are only used in the same way switched depending on the switching of the gearbox will.

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Claims (3)

- 8 -patent claims: 1. j Zündpanktversteller for Brennkraftmaschiaea which drive EIA change gear transmission, with an input connected to the suction pipe \ Saugdruckstellmotor the internal combustion engine for adjusting the ignition point depending on the D ^ la Hick in Suction pipe, characterized in that in the connection j. (22-24) between the suction pipe (14) and the suction pressure actuator (26) a valve (30) is provided, which when a low gear is set in the gearbox (70) closes and is open when a high gear is set in the gearbox. 2. ignition point adjuster according to claim 1, characterized in that the connection (22-24) between the Suction pipe (14) and the suction pressure servomotor (26) upstream when the throttle valve (16) is closed and when it is open The throttle valve opens into the intake manifold downstream of the throttle valve (opening 20), so that the intake pressure servomotor Suction pressure on when the throttle valve is open and switched on high gear in the gearbox (70) is fed. 3. ignition point adjuster according to claim 1 or 2, characterized in that the valve (30) by a magnet (58) is actuated in the closing direction, which is activated when., tem low gear in the gearbox (70) is excited. 009841/1352 Blank page