SU894211A1 - Apparatus for controlling electric-spark ignition - Google Patents

Description

(54) ELECTRO-SPARK CONTROL DEVICE The invention relates to electric spark ignition control devices, for example, internal combustion engines with an early or late ignition installation by electrical means. A spark-ignition control device is known that converts rotational speed information (two) / received in discrete form from a pulse sensor mounted in front of a gear disk fixed to the motor shaft into a predetermined ignition control algorithm comprising a counter, a strobe generator and a control circuit forming , of a series of angular pulses generated by a pulse sensor when teeth (hollows) of a gear disk pass through it, two series of pulses — a series of odd (2n-1) and a series of even 2p pulses, the series (2p-1) of pulses is passed by the control circuit to the counter input together with the series 2and during the gate pulse S, and then after the end of the gate pulse only the 2p series passes to the counter input. When the sum of counted pulses reaches E, IGNITION, for example, a counter impulse forms over the counter overflows, the phase of which relative to the counting start linearly depends on the frequency of the angular impulses, therefore the rotational speed of the ICE shaft, C This device has a resolution of two in the angular expressions Л 2 Л, where Л is the angular distance between two angular momenta (X const). This reduces the accuracy of setting the ignition angle, which leads to a decrease in the effectiveness of the use of ignition control devices in terms of engine efficiency and the level of toxicity of exhaust gases. The closest technical solution to the present invention is an electric spark ignition control device for internal combustion engines, comprising a counter, a gating pulse generator and a control circuit, one input of which is connected to the output of the sensor-former 2.

A disadvantage of the known device is the low accuracy of the ignition angle control.

The purpose of the invention is to reduce fuel consumption and exhaust emissions by improving the accuracy of ignition angle control.

This goal is achieved by the fact that in the control device of electric-spark ignition, for example, for engines; an internal combustion containing a counter, a gating pulse generator X and a control circuit, one input of which is connected to the input of the sensor forming the angular impulses Xj. the motor shaft, the other input of which is connected to the output of the gating pulse generator t;; |, the first output y. the control circuit is connected to the counting input of the trigger of the first discharge of the counter, the control circuit contains a third input connected to the output: X trigger of the first discharge of the counter, and a second output y.j connected to the counting input of the trigger of the second discharge of the counter.

Moreover, the elements of the circuit: controls are connected in such a sequence that its operation implements the following logical functions:

Y X L X2 .;

Y2 Xj. Fig. 1 shows a block diagram of an electric spark ignition control device two, in Fig. 2 an oscillogram of a pulse. Fig. 3 is the same, the strobe pulse in Fig. 4 is the same, angular pulses 2. Fig., 5 the same, pulses at the first output of the control circuit; 6 is the same, pulses X at the output of the first discharge trigger of the counter; 7 is the same, pulses at the second output Vj of the control circuit; Figure 8 is the same as control pulse Z; Figure 9 is a variant of the control circuit.

The control unit consists of a counter on triggers 1, 2, 3, ..., n, a strobe pulse generator 4, a control circuit 5, on the first input of which angular pulses X2 are received, the second input is connected to the output of the strobe pulse generator X (third the input is connected to the output of trigger 1 of the first digit of the sn. The first output V i of the control circuit 5 is connected to the counting input of the trigger 1. The second output of the control circuit 5 is connected to the counting input of the trigger 1. The second output of the control circuit 5 is connected to the counting input of the trigger 2 Set Inputs rigger 1,2,3, ..., n and the start input of the pulse generator 4 are connected to the gate terminal of the signal X Start counting.

The device works as follows.

Signal XQ Start of counting (Fig. 2} sets the counter to the initial state and starts the generator 4 of a building pulse, which generates a pulse X of a given duration S (Fig. 3). During the strobe pulse X, the circuit 5 of the control-t does not transmit angular pulses XQ (Fig. 4) to the output Vj, transmitted to the counting input of trigger 2, and after the end of the strobe pulse to Va., Signals from the input Xd, i.e., from the output of the trigger 1, whose input receives the angular pulses from the output of the circuit 5 controls, i.e., at the outputs v / i, In the control circuit 5 real zuyuts following logic functions:

Y X A Xi /

0 In Xs.

If A denotes the number of angular pulses arriving in time S; B is the number of angular pulses arriving after the end of the strobe

5 pulses before counter overflow; C is the number of angular pulses arriving from the beginning of the counting until the moment of overflow of the counter; Е is the number of angular impulses from the beginning of counting to the top dead center of TDC, then Е 2А + в, С А + В, whence С Е - А, i.e. if the number of angular impulses

"From the start of counting to the top dead center is equal to the capacity of the counter, the control unit provides for automatic control of the angle of advance of the control pulse to A angular pulses, depending on

0 the frequency of the following angular pulses with discreteness D.

The control circuit 5 can be performed, for example, as shown in FIG. 9. In the specified control scheme

5 signal X is fed to the input of the inverter 6 and to the first input of the circuit And 7, the signal X is fed to the first input of the circuit And 8 yen second input of the circuit And 7. The output of the inverter 6 is connected to the second

0 input cxeNOJ AND 8 and with the first input of the circuit AND 9, the second input of which receives the signal X. The output of the circuit AND 9 is connected to the first input of the circuit OR: 10, the second input of which is connected to the 5 output of the circuit AND 7. At the output of the circuit And 8 function V is formed

The proposed device makes it possible to reduce the discreteness of adjusting the ignition angle of the engine from revolutions

60 compared with the known devices twice, providing more precise regulation of the combustion process of the engine, which reduces fuel consumption and toxicity

65 exhaust and also improve)

dynamic characteristics of the car.

Claims (2)

1. Electro-spark ignition control device, for example, for internal combustion engines, comprising a counter, a gating pulse generator X and a control circuit, one input of which is connected to an output of an angular impulse generator Xi of an engine shaft, the other input of which is connected to an output of a gating pulse X, The first output 5 of the control circuit is connected to the counting input of the trigger of the first discharge of the counter, distinguished by the fact that, c; to reduce fuel consumption and exhaust emissions, by improve the accuracy control ignition angle, the control circuit contains a third input connected to the output Xj of the trigger of the first discharge of the counter, and a second output v. connected to the counting trigger input of the second bit of the counter., 2. The device according to claim 1, wherein the elements of the control circuit are connected in such a sequence that its operation implements the following logical functions: HA OUSE. X AXjVX AX t5, Sources of information, ; taken into account in the examination 1. The patent of Germany 1917389, cl. F 02 p 3/00 5/08, 1969. 2. The patent of England No. 1313114, cl. F 1 B, 1973. ( 9