CS204125B1 - Facility for the control of the electromagnetic injection valves in the stroke of the four-stroke motors - Google Patents

Abstract

1532865 Controlling I C engine fuel injection WISSENSCHAFTLICH-TECHNISCHES ZENTRUM AUTOMOBILBAU KARL-MARX-STADT VEB 11 Nov 1976 [18 Nov 1975] 46962/76 Heading F1B A fuel injection system comprises first and second pulse generators rotating with the crankshaft and the cam-shaft of the engine respectively and electronic switching means responsive to coincidence of the pulses to distribute them to the fuel injection valves associated with each cylinder of the engine. As shown, a crank-shaft driven disc 1 influences sensors 11, 12, 13 to produce pulses which are shaped at 101, 102, 103 and pass to pairs of AND gates 41, 46; 42, 45; 43, 46 respectively. A disc 2 driven by the engine cam-shaft produces a positive and negative pulse each revolution which pass either directly or through inverter 3 to the AND gates. When the pulses coincide the respective AND gate triggers the associated thyristor 51-54 and thus allows an injection pulse which is computed in calculator 7 from sensed operating parameters to pass through to the respective injector valve 61-64 for a period that is determined by the extent of the protrusion on the crank-shaft disc. Preferably the crank-shaft disc sensors produce sawtooth outputs which progressively decrease in amplitude.

Description

The invention relates to an apparatus for controlling solenoid valves in four-stroke internal combustion engines, in which all the injection valves are dilutable by a single wiring stage, for example a power transistor or thyristor determining the injection time and duration, and each solenoid injection valve is? in tact nabuditelný electronic switch nazapojovacím stage immediately controlled cam shaft ^1.

Electromagnetic injection valves of this kind are described in German Patent Nos. 1 451959 and 1 576 280. Their contacts are actuated by a camshaft and actuated by electronic switches, such as thyristors, which distribute excitation pulses to individual solenoid injection valves. The excitation pulses always come on all electroharm switches, they are emitted from one power stage, which is energized by the shifting mechanism actuated by the camshaft pulses. This shifter determines the engagement time of the solenoid injectors.

The disadvantage of this embodiment is that the shifting mechanism, which determines the engagement time of the electromagnetic injection valves, is driven by camshaft pulses, which are inaccurate to the crankshaft position due to the uneven rotation and oscillation, and therefore need to be adjusted for each cylinder. contact for electronic switch control.

German Patent Specification No. 2,331,264 discloses; a device for controlling the solenoid injection valves in the correct cycle, each shift solenoid associated with each solenoid injection valve. With respect to the ignition pulses and the shifting pulse after each duty cycle, the injection pulses are split at the shifting stages by a computer and a digital decoder. Each shifting stage is preceded by a gate, which gates are preset alternately in two groups by adjustable flip-flop circuits and receive an injection signal through their next input, thereby engaging the respective shifting stage.

A drawback of this embodiment is that a shift register is used to distribute the injection signals, thereby increasing the cost of each shift stage of the electromagnetic injection valve. The splitting of the shift register signals has the principle disadvantage of starting the engine that z. . the rest positions must be completed until one pulse is detected - one duty cycle, that is, in the unfavorable position of the crankshaft, only after about two revolutions of the crankshaft does proper distribution occur and only then ^; the injection pulses reach the electromagnetic injection valves.

French Patent 2,117,626 discloses a pulse selection or ignition selection device for multi-cylinder internal combustion engines with irregular ignition spacings, in which the crankshaft trigger pulses, cyclic sequence, can be obtained by gates according to uneven ignition spacings. The crankshaft pulses are sensed from the pulse disc by two sensors. The sensors are arranged so that the sensors form an angle which corresponds to the smallest ignition distance between the individual cylinders.

The gates to which the crankshaft pulse as well as the camshaft pulse are always applied are self - pulses. Depending on the irregular ignition sequence, the crankshaft either suppresses and / or generates trigger pulses such as ignition or injection pulses.

In this arrangement, it is advantageous that the trigger pulses for both ignition and injection are derived directly from the crankshaft.

However, the distribution of pulses to the injection valves or the spark plugs of the cylinders is not described in the patent.

The above drawbacks are eliminated by means of an electromagnetic injection valve control system for four-stroke internal combustion engines in a cycle in which all - - electromagnetic injection valves are pluggable - - by one switching stage, such as a power transistor or thyristor, determining the moment and time the injection duration, and each electromagnetic injection valve is tactable by an electronic switch on the engagement stage, which is controlled by a camshaft, according to the invention, the principle being that the pulse disc is fixed to the the crankshaft is in the range of the injection angle - provided with a ridge to which sensors are assigned at angular - intervals - the pulse train, with the pulse formers connected, whose outputs are connected to the first - gate inputs of the cylinders operating offset - - o. °, while the second input of these gates is always connected with a conductor for - - transmitting a pulse derived from the camshaft pulse disc, whose elevation is 180 °, and the gate output is - connected or always directly connected to the control electrode of the electronic switch closed in - energized state .

On the first group of gates, the camshaft pulse generator is connected directly to the second input of these gates, while an intermediate negator is connected to the second input of these gates.

The crankshaft pulley disc elevation is equipped with a signal generator corresponding to the crankshaft angle of rotation and an injection angle sensor range connected directly to the computer.

The advantage of the device according to the invention lies in the simple construction of the pulse distribution system for injection and the multiple use of the signal in the injection area.

A particular advantage of the invention is that the pulses for the injection area are sensed by sensors 11, 12, 13 in the angle β range. These pulses are used to determine both the time of injection and the time of injection, depending on the angle of rotation of the crankshaft.

The invention is explained in more detail below. In the accompanying drawings, in which:

1 shows a block diagram of a device according to the invention for controlling the injection of electromagnetic injection valves at the correct clock; and FIG. 2 shows a pulse plan of this circuit, the pulse train being the initial signals and the input signals of the wiring units indicated by reference numerals.

Fig. 1 shows a block diagram of a device according to the invention for a six-cylinder internal combustion engine whose angular ignition distance is γ = 120 °. On the crankshaft of the internal combustion engine there is fixed a pulse disk 1, which is provided with a pulse emitting elevation, which elevation is adapted - at an angle β - corresponding to the angular range of the injection region. Above the pulse plate - - 1 crankshaft are. provided - sensors 11, 12, 13 for - sensing the time - course of the range of region - when - rotating the pulse, disc 1 around these sensors 11, 12, 13. a. at the output of the forming units 101, 102, - 103 - - impulses Output pulses are generated in succession, which are always applied in pairs. .. gates. 41, 46 - or 42, 45 or - 43, 44. - The two pairs of gates - always belong to the - cylinders - working offset by - 360 °.

Also on the combustion camshaft. The motor is fixed pulse - disc

2, which is provided with an elevation of 180 °. A sensor - 21, above the pulse disc - 2, is provided for the camshaft sensing. the pulses of which are introduced into the - 22 pulse generator, at the output of which - each - one pulse of the camshaft is generated for the half-speed range of the cam- - shaft, - for the full speed range of the - crankshaft.

This camshaft pulse is always applied to the first group of gates 41, 42, 43, while to the second group of gates 44, 45, 46 this pulse is introduced in the negated state. The camshaft pre-pulse is negated by a negator

3. - - - -

0-4125

Furthermore, in the apparatus according to the invention, it is adapted to:. dividing the injection pulses into individual solenoids of the combustion engine injection valves. wiring stage · 8, controlled by computer 7; therefore, they are firstly introduced into the computer 7. pulses from sensors. 11, 12,. 13 pulse disc 1 and also The values n _k · tm and the rotation angle of the crankshaft from which. is a computer 7. to determine during start-up of the pulse for the range of the injection area within the angle range β start i. · Absolute. the pulse length of the wiring step. 8 k. injected ·. fuel. do ·. appropriate. . cylinder combustion. engine. . .

Preferably. is the elevation 10 of the crankshaft pulse disc 1,. emitting impulse, created for emergence. voltage. during the range. the injection area it represents. pulse information. corresponding to the angle. crankshaft rotation. . This sawtooth tension that. has. v. during the downward trend. in the computer 7 according to the motor operation. conditions determine the moment of time. injection, so. and the duration of the injection as described. in patent application WP F 02 d / 187 904.

The operation of the device according to the invention is as follows:

Impulses sensed by sensors 11, 12, 13 z. impulse. disc 1 is primarily introduced to one side of the computer 7 at the other side of introducing _the values of n, i. _m AA 'determine the correct point in time and injection duration in the range of injection molding, the disc 1 on impulsovém- angle β for wiring. Grade 8.

Furthermore, the pulses of the sensors 11, 12, 13 are applied to the pulse former 101, 102, 103, the output pulses of which are further applied to a pair of gates 41, 46 or 42, 45 or 43, respectively. 44. The aforementioned pairs of gates are modified. always for combustion cylinders. . motor, which operate offset by an angle of 360 °. The pulse disc 2 fixedly mounted on the camshaft is sensed by a pulse sensor 21, the pulse of which is applied to the pulse former 22, wherein one pulse is generated at the output of the pulse former 22 during half a revolution of the camshaft.

This camshaft pulse is always applied to the first group of gates 41, 42, 43 by conductor 220, whereas to the second group of gates 44, 45, 46 this pulse is applied to conductor 223 as negated by negator 3. Once at one of gates 41 to 46 provides both a crankshaft pulse and a cam pulse. the electronic switch 51, corresponding to the gate 41, is switched on, and the wiring stage 8, controlled by the computer 7, sends an impulse for injection, which is closed. by means of an electronic switch 51 leads to the respective solenoid 61 of the injection valve for. . cylinder ... I. .the internal combustion engine.

For a more detailed explanation of the function. The device according to the invention serves a plan. pulses shown in. FIG. for a six-cylinder four-stroke in-line engine. with working sequence of cylinders I, .. II, III, VI, ... V, iV,. schematically shown in. Fig. 1. Impulses. crankshaft. applied to the pulse former 101, 102, 103 when rotated. ^Crankshaft:. shaft angle. 360 ° drain. Mon yourself from. these . pulses. as . impulses. KI101. ha 'a pair of gates 41, 46, as well. pulses .KI 102 on the pair .hradel 42 ,. 45 a. . as . pulses .KI 103. on the pair. gate 43,. 44. At the same time,. always after crank rotation. shafts o. angle 360 °,. Located . alternately at first. group of gates. 41, 42.43 impulse. NI 22. ' and on the second group of gates 44,. 45, 46 pulse. NI 3 cam. Shafts

By ^: occur after. these states of engagement:

1. Na. gates 41 se. only two pulses KI 101 and NI 22 are found. By electronic switch 51, the injection valve solenoid 61 receives a pulse E18 for injection.

2. Be on gate 42! only two pulses KI 102 and NI 22. Electronic. switch 52 receives the injection solenoid valve 62, the cylinder II with an impulse E18 for injection.

3. There are only two pulses KI 103 and NI 22 on the gate 43. The solenoid 63 receives an electronic switch 53. injector cylinder III impulse E18 for injection.

4. There are only two pulses KI 101 a on gate 46. NI 3. The electronic switch 5'6 receives the injection valve solenoid 66 of the cylinder VI pulse El 8 for injection.

5. There are only two pulses KI 102 and NI 3 on the gate 45. By electronic switch 55, the cylinder injector solenoid 65 receives a pulse E18 for. injection.

6. On the gate 44 there are only two pulses KI 103 and NI 3. Electronic. switch 54 receives the injection valve solenoid 64 of the cylinder IV pulse E18.

The device according to the invention is applicable to electronic injection devices for intermittent injection at the right time in four-stroke multi-cylinder internal combustion engines.

Claims (3)

OBJECT OF THE INVENTION 1. Apparatus for controlling solenoid injection valves in four-stroke internal combustion engines, in which all solenoid injection valves are pluggable in one switching stage, such as a power transistor or thyristor, determining the moment and duration of injection, and each solenoid injection valve is pluggable electronically a switch on the engagement stage, which is controlled by a camshaft, characterized in that the crankshaft has a fixed pulse disc (1) which is provided with an elevation within an angle (ι / S) for the injection region to which they are at angular intervals ( y) the injection zone sensors (11, 12, 13) assigned to the injection sequence are connected to the former (101, 102, 103) whose outputs are connected to the first gate inputs (41, 44, 42, 45, 43, 46) of the offset cylinders in each case by an angle of 360 [deg.], the second inlet t These gates (41 to 46) are each connected with a conductor (220, 223) for transmitting a pulse derived from a camshaft pulse disc (2) whose elevation is formed at an angle of 180 ° and the gate output (41 to 46) is connected or immediately is always connected to the control electrode of the electronic switch (51 to 56), which is energized. Device according to claim 1, characterized in that the first group of gates (41, 42, 43) is connected directly to the second input of these gates (22), while the second group of gates (44, 45, 46) is connected directly to the second group of gates. an intermediate negator (3) is connected to the second input of these gates. Device according to claim 1, characterized in that the crankshaft pulse disc elevation (G / 3) as the injection region is provided with a signal generator corresponding to the crankshaft angle within the angle range (β / 3), and the injection area sensors (11, 12, 13) are directly connected to the computer (7).