CN2926538Y

CN2926538Y - Intelligent switch of fuel-gas controlling system for electric spray automobile

Info

Publication number: CN2926538Y
Application number: CNU2006200716436U
Authority: CN
Inventors: 赵旭
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-05-15
Filing date: 2006-05-15
Publication date: 2007-07-25
Anticipated expiration: 2016-05-15

Abstract

The utility model relates to an intelligent change-over switch of an electric spraying vehicle fuel gas system and is applied to the oil-gas switch of electric spraying vehicles adopting both oil and gas as fuels for automatic switching control. The utility model comprises a water-temperature signal input channel, an engine rotary speed signal input channel, and a liquid level signal input channel, a central processing unit and a controlling and driving unit. The central processing unit monitors the water temperature of an evaporator and the rotary speed of an engine through moment and controls the oil-gas switch through the controlling and driving unit and according to the switch conditions preliminarily set in the interior of the utility model. The utility model enables the electric spraying vehicles adopting both oil and gas as fuels to utilize two kinds of fuels effectively and scientifically.

Description

A kind of EFI car gas control system intelligent change-over switch

Technical field

The utility model relates to a kind of EFI car gas control system intelligent change-over switch circuit, is used for adopting the conversion of oil gas dual-fuel EFI car oil gas to carry out automatic conversion and control.

Background technique

In order efficiently, scientifically to utilize double fuel, double fuel EFI car will meet some requirements when carrying out the oil gas conversion, and common condition is: 1, motor starts all moving with fry dried food ingredients at every turn when throw over switch is in the automatic conversion of intelligence; 2, reach setting value when evaporator water, engine speed rises and meets or exceeds after the setting value and when decelerating to another setting value again, throw over switch cuts off oil supply circuit to be transformed into simultaneously immediately uses gas; 3, (this is a switch condition, and water temperature and rotating speed two conditions must possess simultaneously and could change) in case after throw over switch was transformed into the air feed state, no matter whether rotating speed was lower than setting value, as long as rotating speed is non-vanishing, throw over switch will remain on the air feed state always; 4, in a single day find that engine speed is zero, throw over switch cuts off the power supply of air valve and air-channel system automatically after time-delay three seconds, close gas check valve.Need an intelligent control switch that can switch oil gas automatically according to above-mentioned terms and conditions for this reason.

The model utility content

The purpose of this utility model is to provide a kind of EFI car oil gas control system intelligent change-over switch, and this switch can carry out oil gas automatically according to above-mentioned predefined requirement and switch.

The utility model provides a kind of EFI car oil gas control system intelligent change-over switch for this reason.Owing to be provided with central processing unit and the control drive unit that water temperature signal input channel, engine rotational speed signal input channel and single-chip microcomputer are core in the EFI car oil gas control system intelligent change-over switch, central processing unit can be monitored the gentle engine speed of evaporator water constantly by water temperature signal input channel and outside cooling-water temperature sensor and engine rotational speed signal input channel and outer speed probe, switches by control drive unit control oil gas by the switch condition that sets in advance in inside.

The utility model is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.

Description of drawings

Accompanying drawing 1 is the utility model specific embodiment theory diagram;

Accompanying drawing 2 is an electrical schematic diagram;

Accompanying drawing 3 is the central processing unit program flow chart;

Embodiment

As Fig. 1, shown in Figure 2, EFI car gas control system intelligent change-over switch is provided with the water temperature signal input channel that the evaporator water value electrical signal of outside cooling-water temperature sensor collection is delivered to central processing unit, the engine speed electrical signal of outer rotating speed (high tension ignition pulse induced signal) sensor acquisition is delivered to the engine rotational speed signal input channel of central processing unit, the leve signal of liquid gas in the steel cylinder of outer liquid gasification liquid level sensor collection is delivered to the liquid gas liquid level signal input channel of central processing unit, central processing unit and the digital high that will import from central processing unit or low level control signal are carried out power amplification and are started the control drive unit of air-channel system or oil-way system according to this signal respectively.Central processing unit is core with the single-chip microcomputer, be provided with timer, water temperature value storing apparatus, water temperature setting value storing apparatus, tachometer value storing apparatus, the first speed setting value storing apparatus, the second speed setting value storing apparatus and water temperature comparator and first rotary speed comparator and second rotary speed comparator, described water temperature comparator compares the water temperature setting value in water temperature value in the water temperature value storing apparatus and the water temperature setting value storing apparatus, and makes output startup electric pump signal or carry out rotating ratio selection according to comparative result; Described first rotary speed comparator compares first speed setting value in the tachometer value in the tachometer value storing apparatus and the first speed setting value storing apparatus, and make output according to comparative result and start the electric pump signal or carry out the selection of second rotating ratio, described second rotary speed comparator carries out second rotating ratio with second speed setting value in the tachometer value in the tachometer value storing apparatus and the second speed setting value storing apparatus, and make according to comparative result that output starts the electric pump signal or electric pump is closed in output, open the selection of air valve signal, above-mentioned functions reaches by programming, program flow chart is referring to Fig. 3, single-chip microcomputer can adopt 16F72 type or MCS-51 Series chip, and this specific embodiment adopts 16F72; The data input pin RA1 of single-chip microcomputer 16F72 directly is connected with outside cooling-water temperature sensor output as the water temperature signal input channel; Another data input pin RA4 is as the engine rotational speed signal input end, in order to improve interference free performance, in passage, be provided with shaping circuit and photoelectric isolating circuit, shaping circuit is made of the comparison circuit that operational amplifier U2 and divider resistance R1, R2 form, and photoelectric isolating circuit selects for use optocoupler U3 to constitute; In order to make EFI car gas control system intelligent change-over switch have multiple working state to select, also be provided with and force to use gas, force with oil and automatic conversion selecting switch Q, Z, Y, representative forces to use gas respectively, automatically conversion and pressure are with oily, selector switch Q, Z, the end of Y interconnects together after ignition switch DFK is connected to storage battery, the other end of selector switch Y is unsettled, the other end one tunnel of selector switch Z is connected with the data input pin RC7 of single-chip microcomputer 16F72 after optocoupler U4 isolates, another road of the other end of selector switch Q and the selector switch Z the other end is respectively through providing working power through electronic switch and three terminal regulator for central processing unit together behind diode D5 and the diode D6, electronic switch PNP triode Q2 and field effect transistor Q1 and voltage-stabiliser tube D1, D2, D3 and current-limiting resistance R1, R2 forms, the emitter and collector of triode Q2 is connected with grid with the source electrode of triode Q2 respectively, the base stage of triode Q2 and voltage-stabiliser tube D1, D3 and current-limiting resistance R2 series connection back ground connection, current-limiting resistance R1 is connected across between the source electrode and ground of field effect transistor Q1, voltage-stabiliser tube D1 is connected across between the source electrode and grid of field effect transistor Q1, the drain electrode of field effect transistor Q1 is connected with the three terminal regulator input end, and the negative pole of diode D5 and diode D6 is connected with the source electrode of field effect transistor Q1; For more directly perceived, in EFI car gas control system intelligent change-over switch, also be provided with gas, with oily working state indicating member, specifically be between the data output end of single-chip microcomputer 16F72 and ground, connect light emitting diode and current-limiting resistance.Control drive unit comprises gentle pump startup relay J 1 of triode Q3 and pump start relay J 2, triode Q3 control air pump starting relay J1, the base stage of triode Q3 is connected with the data output end RC0 of single-chip microcomputer 16F72 through resistance R 3, between the common point and ground of pump start relay J 2 and the contact that is connected air pump starting relay J1 after air valve coil QF is in parallel, the normally opened contact of the contact of air pump starting relay J1 is connected with positive source, normally-closed contact is unsettled, and the normally-closed contact of pump start relay J 2 is serially connected in the power loop of electric oil pump YB.

The brief introduction of intelligent change-over switch circuit working principle:

(switch Z closes when selecting switch to place the Z position, Q, Y disconnect), throw over switch selected " automatically " state, when engine start, ignition switch DFK closes, + 12V power supply is by DFK socket P15 pin, P7 pin, switch Z, socket P5 pin, reference diode D2 overvoltage protection field effect transistor Q1 output VCC voltage, and by three terminal regulator 7805 output+5V voltages, this voltage one tunnel is supplied with the external circuit liquid level sensor and is used as working power through recovering to insure the output of WH60-005, diode D12 and socket P13 pin; Another road is through diode D13 output vdd voltage each circuit supply in single-chip microcomputer U1 and throw over switch, after single-chip microcomputer U1 obtains working power, on the one hand by data input pin RA0, RB1 and RB0 pin read the working state of K1～K4, to judge that the sensor on the steel cylinder is LPG (liquefied petroleum gas (LPG)) liquid level sensor or CNG (rock gas) pressure transducer, and according to height of the liquid level in the steel cylinder or pressure size, by single-chip data output terminal RB7, RB3, RB2, RB5 output is corresponding to show that signal is a high level, makes the corresponding tutorial light of light emitting diode L1～L5 luminous; Single-chip microcomputer reads the working state of panel selector switch Q, Z, Y by optocoupler U4, diode D4 from the RC7 pin on the other hand, when single-chip microcomputer is judged as " automatically " state, just by the RA1 pin, socket P18 pin detects the SW water temperature signal, single-chip microcomputer RC2 pin output water temperature detects and shows signal simultaneously, light emitting diode L8 is luminous, shows that single-chip microcomputer is detecting water temperature.

After water temperature reaches setting value, single-chip microcomputer RC3 pin output water temperature has reached the demonstration signal of setting temperature, light emitting diode L9 is luminous, light emitting diode L8 extinguishes, then single-chip microcomputer is by the RA4 pin, optocoupler U3, resistance R 10, operational amplifier U2, resistance R 5 and socket the 19th pin detection of engine rotating speed, the demonstration signal that single-chip microcomputer RC2 pin output this moment detects rotating speed makes corresponding light emitting diode L10 luminous, after single-chip microcomputer U1 detects engine speed and meets or exceeds setting value, just export corresponding demonstration signal from the RA5 pin, make corresponding light emitting diode L11 luminous, this moment, single-chip microcomputer U1 continued the detection of engine tach signal, see whether motor slows down, and whether decelerate to setting value.When single-chip microcomputer U1 detects water temperature and rotating speed and does not satisfy switch condition simultaneously, single-chip microcomputer U1 is by RC0 pin output low potential, be added to the base stage of triode Q3 by resistance R 3, diode D8, Q3 ends, and relay J 1 is failure to actuate, P14, P17 export no-voltage, the air valve QF that is connected on P17 closes, and is connected on the relay J 2 line Bao Wudian of P14 pin, at this moment+and 12V oil pump power supply (See Figure) process normally-closed contact B point-C point-electric oil pump YB-ground, electricity oil pump YB starts work, and engine operation is in using oil condition; Meanwhile, single-chip microcomputer U1 exports a high petential from the RB6 pin and lights L6 (amber light), and the indication conversion work is in oil condition.

When detecting above water temperature, single-chip microcomputer U1 reached setting value, when engine speed has risen to setting value and has decelerated to another setting value, immediately by the RC0 pin, resistance R 3, diode D8 is added to the base stage output high level of triode Q3, make the Q3 conducting, relay J 1 adhesive, + 12V power supply is by socket the 11st pin, the protective tube of 4A, close oil-closing valve YB and to 17 pin of socket simultaneously export the signal of opening air valve QF to the output of socket P14 pin the normal battle of relay J 1, the realization motor is started working in oil, (water temperature and rotating speed) with good conditionsi is transformed into automatically and uses gas, (seeing last figure).Simultaneously, single-chip microcomputer U1 exports a high petential by the RA2 pin, lights L12 and represents that the rotating speed deceleration reaches setting value.

K5 is that the signal that socket P19 pin is connect is the status switch of tach signal or pulse induction signal among the figure; when socket P19 is tach signal; K5 places the ON position; when pulse induction signal that socket P19 pin connects; K5 places the OFF position; K6 is a backup circuit breaker, and the insurance of 4A is output overcurrent protection or short-circuit protection.

Diode D10, optocoupler U5, diode C7, resistance R 13 constitute output with oil or with the state detection circuit of gas, testing signal is by the RC5 pin input of single-chip microcomputer U1, when detection is the defeated high voltage of RB6 pin when using oil, make light emitting diode L6 luminous, when detecting is when using gas, make light emitting diode L7 luminous by RB4 pin output high petential, RB6 pin output low potential, light emitting diode L6 extinguishes.

When the panel selector switch made the Y shelves, this moment, switch Q and Z all disconnected, for forcing with oil, this moment, throw over switch did not have working power, and circuit such as single-chip microcomputer U1 are not all worked, and was zero by socket P14, P17 output voltage, relay J 2 normally closed points are connected, and engine operation is in moving state with fry dried food ingredients.When forcing with oil, panel leds goes out entirely, and expression is with forcing with oil.

When the panel detecting switch places the Q shelves, this moment, switch Z and Y all disconnected, and single-chip microcomputer U1 is judged as and forces to use gaseity by reading the working state of these three switches, this moment, no matter whether water temperature and rotating speed satisfied switch condition, the RC0 pin is all imported high petential, makes triode Q3 conducting, relay J 1 adhesive, socket P14, socket P17 output+12V voltage, close oil-closing valve YB, open air valve, make engine operation in using gaseity.

Be in under the gaseity at throw over switch, if it is zero that single-chip microcomputer U1 detects tach signal, after single-chip microcomputer U1 time-delay three seconds, by RC0 pin output low potential, triode Q3 is ended, and relay J 1 does not have electricity, and socket P14, socket P17 do not have 12V output, close air valve QF, realize three seconds passes of time-delay air valve QF.

Claims

1, a kind of EFI car gas control system intelligent change-over switch is characterized in that described intelligent change-over switch is provided with:

Water temperature signal input channel: the evaporator water value electrical signal of outside cooling-water temperature sensor collection is delivered to central processing unit;

Engine rotational speed signal input channel: the engine speed electrical signal of outer rotating speed (high tension ignition pulse induced signal) sensor acquisition is delivered to central processing unit;

Liquid gas liquid level signal input channel: the leve signal of liquid gas in the steel cylinder of outer liquid gasification liquid level sensor collection is delivered to central processing unit;

With the single-chip microcomputer is the central processing unit of core: be provided with timer, water temperature value storing apparatus, water temperature setting value storing apparatus, tachometer value storing apparatus, the first speed setting value storing apparatus, the second speed setting value storing apparatus and water temperature comparator and first rotary speed comparator and second rotary speed comparator, described water temperature comparator compares the water temperature setting value in water temperature value in the water temperature value storing apparatus and the water temperature setting value storing apparatus, and makes output startup electric pump signal or carry out rotating ratio selection according to comparative result; Described first rotary speed comparator compares first speed setting value in the tachometer value in the tachometer value storing apparatus and the first speed setting value storing apparatus, and make output according to comparative result and start the electric pump signal or carry out the selection of second rotating ratio, described second rotary speed comparator carries out second rotating ratio with second speed setting value in the tachometer value in the tachometer value storing apparatus and the second speed setting value storing apparatus, and makes output according to comparative result and start the selection that electric pump signal or output are closed electric pump, opened the air valve signal;

Control drive unit: the digital high that will import from central processing unit or low level control signal are carried out power amplification and are started air-channel system or oil-way system respectively according to this signal.

2, EFI car gas control system intelligent change-over switch according to claim 1 is characterized in that also being provided with in the engine rotational speed signal input channel shaping circuit and photoelectric isolating circuit.

3, EFI car gas control system intelligent change-over switch according to claim 1 and 2 is characterized in that also being provided with and forces usefulness gas, pressure oil and automatic conversion selecting switch, and selector switch is connected with the central processing unit data input pin.

4, EFI car gas control system intelligent change-over switch according to claim 3 is characterized in that also being provided with gas, with oily working state indicating member.