RU1838647C - Fuel feed control device for internal combustion engine - Google Patents

Description

respectively, of the first and second frequency comparators 12 and 13, and the output of the converter 11 is connected to the second inputs of the frequency comparators 12 and 13. The output of the converter 2 is connected to the first group of control inputs of the control signal duration setting unit 14, the second group of control inputs of which are connected to the output of the first frequency comparator 12. The outputs of the inverter 5 and the comparator 13 are connected respectively to the first and second inputs of the matching circuit 15. The output of block 14 is connected to the driver 16 of the control signal, the trigger input of which is connected to the output of the circuit 15, and the output of the driver 16 is made as the output of the control unit 3.

The engine speed sensor 4 is made in the form of a contactless ignition timing sensor and is a coil 17 placed coaxially with the high voltage wire 18 of the ignition coil.

The throttle angular position sensor 1 is made in the form of a potentiometer 19, the movable contact of which is kinematically connected to the throttle actuator (not shown).

The first converter 2 is made in the form of an analog-to-digital converter 20 and includes a first reference frequency generator 21, a counter 22, a second step voltage generator 23 made with a control input, a comparator 24 and a register 25. The generator 23 can be made by amplifier circuit with discrete amplification degrees. The output of the generator 21 is connected to the information input of the counter 22, the bit outputs of which are connected to the corresponding information inputs of the register. 25 and the control input of the generator 23. The inputs of the comparator 24 are connected to the output of the generator 23 and the movable contact of the potentiometer 19, the fixed contacts of which are connected to the terminals of the power source, and the output of the comparator 24 is connected to the synchronization input of the register 25, the bits of which are the output of the converter 2.

The first converter 10 of the signal into a serial code is made in the form of two controlled oscillators 26 and 27, the outputs of which are the outputs of the converter 10. Each generator 26 and 27 is equipped with an i-ro code identifier for the throttle position interval. In this case, the pulse frequency at the output of the generator 26 corresponds to the minimum value of the throttle open signal within the i-ro interval, and the pulse frequency at the output of the generator 27 corresponds to the maximum value of the throttle open signal at

within the i-ro interval.

The second signal to serial converter 11 is designed as a frequency multiplier and serves to coordinate the temporal characteristics of the signals from

sensor 4 and transmitter 10.

Block 14 for setting the duration of the control signal is made in the form of N series-connected chains (according to the number of bits of control from analog-digital

5 transducers), each of which has two series-connected resistors 28 and 29 and two controlled keys 30 and 31, one of which is connected in parallel to the chain, and the other parallel to the second resistor. The control inputs of the keys 30 and 31 form, respectively, the first and second groups of control inputs of the unit 14, while the closed state of the key corresponds to the presence of a zero signal at its control input.

Shaper 16 can be made in the form of a single vibrator 32, the driving element of which is the total resistance of block 14, and matching circuit 15 is made in the form of element 2I 33 ..

The device operates as follows.

When the engine is running, signals from krv 1 and 4 are fed to the inputs of converters 2 and 5, respectively, while pulses are generated at the output of converter 5, the repetition rate of which is proportional to the frequency of rotation of the engine’s crankshaft. At the exit

0 of converter 2, a code is generated corresponding to the opening angle of the throttle valve. The keys 30 of block 14 are set to the position determined by the code at the output of register 25. At the output of generators 26 and

5 to 27, pulse trains are generated whose frequency corresponds to the lower and upper limits of the throttle opening angle within the 1st interval identified by the output code of register 25.

t If the frequency of the signal FmaX | Ha at the output of the generator 27 is less than the pulse repetition rate from the sensor 1, which corresponds to the engine operating mode

5 (load shedding), a zero signal is generated at the output of the comparator 13, prohibiting the operation of the single vibrator 32, while there is no fuel supply to the intake pipe. Otherwise, the signal lo0

5

0

5

0

Gichfsky 1 from the output of the comparator 13, the formation of control signals (s at the output of the one-shot 32 at the moments, time, corresponding to the moments of ignition in the engine.

If the frequency of the signal Fmjnj at the output of the generator 26 exceeds the pulse repetition rate D ° of the Sensor 4, which corresponds to | Acceleration (load increase) of the engine, then at the output of the comparator 12 there is a single signal and the keys 31 are open, which ensures an increase in the length of the control signal compared with the specified, determined state of the keys 30, which means and. increasing the fuel supply to the engine in the indicated mode.

If the value of the pulse follow-up from the sensor 4 is in the range from Fminj to Pmax, then the output of the comparator 12 generates a zero signal, keys 31, and the duration of the control signal is determined by the code at the output of register 25. the mode corresponds to slight deviations from the established mode.

The execution of the first converter 2 in the form of an analog-to-digital converter, and the second 5 - in the form of a rectangular pulse shaper in combination with the described design of the control unit allows you to monitor not only the established mode of the engine, but also the transition mode, which allows you to adjust the fuel supply to the engine and in the transition mode due to a change in the duration of the control signal, which significantly increases the accuracy of the dosing of fuel in the transition mode.

claims

Claims (4)

1. A control device for supplying fuel to the internal combustion engine, comprising a rotational speed sensor of the engine rim shaft, a throttle angle sensor, made in the form of a potentiometer, the movable contact of which is kinematically connected to the throttle actuator, control unit, the first and second inputs of which are connected through the first and second converters to the outputs of the throttle angle sensor and the crankshaft speed sensor, and the output through preamplifier - to the coil of an electromagnetic injector, placed in the inlet boprrvode labor-engine, characterized in that, in order to increase the accuracy of the fuel metering in transient conditions. the crankshaft speed sensor is made in the form of a contactless ignition timing sensor, the first converter is made in the form of analog-digital 5 of the converter, the second converter has a band-pass filter and a rectangular signal shaper, the control unit is made in the form of a first signal converter into a serial code with two 0 outputs, the second signal to serial converter, the first and second frequency comparators, unit. setting the duration of the control signal with two groups of control inputs. 5 matching circuits with two inputs and a control pulse generator with information and control inputs, the first and second outputs of the first signal converter into a serial code connected to the first inputs of the first and second comparators, the second inputs of which are connected to the output of the second converter signal into a serial code, the output of the first comparator is connected to each output of the second group of control inputs of the unit for setting the duration of the control signal, the output of which is connected to ormatsionnym control input of the pulse present w0, the output of the second comparator is connected to a second input of the coincidence circuit, the output of which is connected to the control input of the control pulse, and the output of the latter is in the 5 is a control unit output, the input of the first signal converter to the serial code and the first group of control inputs of the control signal duration setting unit are combined with the first input of the control unit, the second input of which is combined with the input of the second signal converter to the serial code and the first input of the matching circuit . 2. The device according to claim 1, with the exception of 5, in that the first signal to serial converter is made in the form of two control generators, the outputs of which are made in the form of converter outputs, each generator has 0 the identifier of the intervals of the input code, the first generator is configured to adjust to a frequency corresponding to the lower boundary of each interval of the input code, and the second to the upper boundary 5 of the same interval. 3. The device according to paragraphs. 1 and 2. It is clear that the second signal to serial converter is designed as a frequency multiplier. 4. The device according to paragraphs. 1-3, characterized in that the control signal duration setting unit is made in the form of N series-connected circuits, parallel to the chain, and the other parallel to the resistor, the control inputs of the keys form respectively the first and second groups of control inputs of the block, and each of which has two sequences; 5 the number of chains is equal to the number of bits resistors and two control-outputs of the analog-to-digital convertible switch, one of which is a switch. parallel to the chain, and the other parallel to the resistor, the control inputs of the keys form respectively the first and second groups of control inputs of the block, and L --- 1 6 s ptsf./ cpe / .Z sixteen AT 1