CN2299744Y

CN2299744Y - Adjustable electronic temp. controller for cooling system of vehicle engine

Info

Publication number: CN2299744Y
Application number: CN 97203272
Authority: CN
Inventors: 李建军; 杨冬平; 王常平
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-21
Filing date: 1997-04-21
Publication date: 1998-12-09
Anticipated expiration: 2007-04-21

Abstract

The utility model relates to an adjustable electronic temp. controller for a cooling system of a vehicle engine, which is mainly composed of a comparison amplification stage, a push stage, a control element, an indication circuit and a voltage stabilizing stage, and temperature of the engine is measured by a water temperature sensor of the engine; the control element controls the work or the closure of a cooling fan; thus, the working temperature of the vehicle engine is controlled in a relatively ideal range, and then the effect that a good power performance of the engine, and noise, oil consumption and engine part abrasion reducing are ensured.

Description

Car engine cooling system adjustable electronic attemperating unit

The utility model relates to car engine cooling system, relates to car engine cooling system adjustable electronic attemperating unit particularly.

The coolant-temperature switch of control cooling fan of engine is the double-metal sheet type coolant-temperature switch in present most minibus, when engine operating temperature is too high, and contact contact in the coolant-temperature switch, thus connect the fan electromotor power supply, cooling fan is started working.Because the conformability of this class coolant-temperature switch operation point is bad, and quite a few start-up temperature higher (some shutoff is too slow, cooling fan is crossed worked long hours).Simultaneously because the operation point of this base part is set before dispatching from the factory and can not be adjusted as required by the user.So often the temperature control effect is undesirable, cause engine operating temperature too high.Particularly at present urban traffic blocking is on the rise, traffic congestion or etc. during red light above-mentioned temperature-adjusting circuit more appear its significant disadvantages.If driving engine is through the work of being everlasting under the excessive temperature state, its result will be: tractive performance declines, noise increase, consumption increase even can accelerate engine parts wearing and tearing shortening its service life.

In order to overcome the shortcoming of above-mentioned coolant-temperature switch, so the purpose of this utility model provides a kind of later-model attemperating unit, and it can accomplish that the optimum start-up temperature of cooling fan of accurate setting engine-cooling system and the best of cooling fan stop temperature.Automotive engine is always worked in the comparatively ideal working temperature range, and engine efficiency is not descended because of operating temperature is too high, thereby guarantee the good tractive performance of driving engine, reduced noise, and reduced the wearing and tearing of oil consumption and engine parts.

The purpose of this utility model is to realize like this, promptly designed a kind of car engine cooling system adjustable electronic attemperating unit, it comprises casing, temperature adjustment knob and circuit card, it is characterized in that: this circuit card is provided with the comparison amplification stage, promotes level, control element, indicating circuit and voltage stabilizing level.The wherein relatively output of the cooling-water temperature sensor of one of amplification stage input termination automotive engine, relatively the output of amplification stage connects the input that promotes level, the output that promotes level is connected with indicating circuit with the input of control element, the output of control element is connected with automobile engine cooling fan, relatively amplification stage is by the power supply of voltage stabilizing level, and remainder is powered by automobile power source on the circuit card.

According to a favourable configuration of the present utility model, the cooling-water temperature sensor of above-mentioned automotive engine is the temperature measurement element of original engine-cooling system temperature measurement part (being the water thermometer circuit) in the automobile.

Make the mode of executing according to the best of the present utility model, above-mentioned relatively amplification stage is made up of comparison amplifier and reactive circuit.Comparison amplifier has two input ends, the output of first input end water receiving temperature sensor, the second input termination, first VREF (Voltage Reference), the mouth and the cross-over connection mutually of second input end of reactive circuit and comparison amplifier, when comparison amplifier ended, reactive circuit made second input end convert second VREF (Voltage Reference) to by first VREF (Voltage Reference).

By using above-mentioned car engine cooling system adjustable electronic attemperating unit of the present utility model, because rising with temperature, reduces the voltage signal of cooling-water temperature sensor output, the current potential of comparison amplifier second input end also decreases.

When its current potential was lower than first reference voltage level, comparison amplifier transferred off condition to by conducting.This moment, reactive circuit forced the current potential on the comparison amplifier positive input to transfer second VREF (Voltage Reference) to.Simultaneously, because comparison amplifier ends, its mouth current potential raises, and promotes level and becomes conducting by ending.Be serially connected in the control element action (relay adhesive) that promotes in the level loop, thereby the cooling fan loop is connected and started working.

Along with the cooling effect of cooling fan to driving engine, the output voltage of temperature sensor raises with drop in temperature, the current potential of the first input end of comparison amplifier also increases, and when its current potential surpassed second reference voltage level, comparison amplifier transferred conducting state to by ending.The comparison amplifier mouth becomes active potential by high potential, the promotion level is become end.Relay discharges cooling fan is quit work.

First VREF (Voltage Reference) of above circuit has determined cooling fan to start working when how high the driving engine temperature rise reach, and driving engine is lowered the temperature.This VREF (Voltage Reference) is to set by regulating first potential device.And the temperature fall of second VREF (Voltage Reference) decision driving engine is when what are spent, and cooling fan quits work.This VREF (Voltage Reference) is set by regulating second potential device.

Owing to can set the mode of operation of cooling fan of engine by first VREF (Voltage Reference) and second VREF (Voltage Reference) of regulating circuit, therefore, this temperature switch circuit has guaranteed that automotive engine can be operated in the normal range of temperatures, thereby guaranteed engine power performance, brought the minimizing noise, reduced oil consumption and reduce engine parts worn-down good result.

In order to understand principle of the present utility model and advantage better, embodiment of the present utility model is done detailed explanation below in conjunction with accompanying drawing.

Fig. 1 is the outside drawing of the car engine cooling system of a preferred implementing form of the present utility model with the adjustable electronic attemperating unit;

Fig. 2 is the circuit block diagram of above-mentioned the utility model device;

Fig. 3 is the physical circuit figure of a preferred embodiment of the utility model.

Fig. 1 is the outside drawing of the car engine cooling system of a preferred implementing form of the present utility model with the adjustable electronic attemperating unit, this device has a shell 2, a circuit card 1 is housed in the shell 2, the front of shell 2 is provided with indicator lamp D1, adjusting knob (being potential device) W1 and W2 reach input, output socket (not shown).

Fig. 2 is the circuit block diagram of above-mentioned car engine cooling system with the adjustable electronic attemperating unit, wherein has comparative degree 12, control element 14, and indicating circuit 16 and voltage stabilizing level 15, they are located on the circuit card 1.The relatively output of the cooling-water temperature sensor 11 of one of amplification stage 12 input termination automotive engine, the output of comparison amplifier 12 connects the input that promotes level 13, the output that promotes level 13 is connected with automobile engine cooling fan 17 with the output of control element 14, relatively amplification stage is by 15 power supplies of voltage stabilizing level, and the remainder of this circuit is by automobile power source 18 power supplies.

Fig. 3 is the physical circuit figure according to a preferred embodiment of the utility model.In the figure, comparison amplification stage 12 among above-mentioned Fig. 2 is Schmidt triggers of being made up of elements such as op amp IC1, promote relay J 1 driving circuit that level 13 is made up of elements such as aerotron T1, control element 14 is relay J 1, indicating circuit 16 is made up of the circuit series of light-emitting diode D1 and resistance R 7, voltage stabilizing level 15 is mu balanced circuits that element such as three terminal regulator IC2 is formed, its output+9V vdc.

IC1 is one and has positive input 3, and the high input impedance comparison amplifier CA3140 of reverse input end 2 and mouth 6 is connected with the system ground wire by common mode and+9V power supply.Form a Schmidt trigger by IC1, R3, W1, R4, R5 and W2, wherein R3, W1 and R4 have formed first loop of setting up first VREF (Voltage Reference) at IC1 positive input 3.

The potential-divider network that R3, W1 and R4 are in series and form, this network be connected on+9V power supply and system's ground wire between.The center-side of W1 links to each other with the positive input of IC1.

This circuit also has a positive input at IC1 to set up second loop of second VREF (Voltage Reference).Be serially connected between the positive input 3 of IC1 and the mouth 6 by R5 and potential device W2 and constitute.

R1, R2 are composed in series the signal input circuit, are connected between signal input part (1 end of CZ1) and the system's ground wire.It partly is temperature measurement element in the water thermometer circuit that temperature sensor preferably uses the original engine-cooling system temperature measurement of automobile, and the d. c. voltage signal that it is exported is connected with the reverse input end of IC1 after R1 and R2 series connection, dividing potential drop.

Cond C1 is connected between 2 and the system's ground wire of IC1, is used for absorbing the pulse interference signal that input circuit may occur, and prevents circuit erroneous action.Cond C2 is connected+9V power supply and IC2 2 between, its effect will be narrated in the back.

The mouth 6 of IC1 is connected to the base stage of aerotron T1 by resistance R 6.The emitting stage of T1 is by resistance R 8 welding system ground wires.The collecting electrode of T1 connects automobile 12V power supply through the control winding of relay J 1.The parallel connection of relay winding a diode D2, its anode links to each other with 1 of J1.Negative electrode links to each other with 2 of J1, in order to eliminate reverse spike in the moment of relay winding outage.Be connected a chemical capacitor C4 between the base stage of T1 and system ground wire, its effect will be narrated in the back.Be connected in parallel on the C8 of 3,4 of relay control contacts, when the break-make of contact, play the extinguishing arc effect.

This circuit is work like this:

When by the voltage signal of automobile engine water temperature sensor output 1 end, and by being connected to the reverse input end of IC1 after R1, the R2 dividing potential drop, compare with first VREF (Voltage Reference) of positive input through CZ1.When the automotive engine temperature was low, sensor was exported a higher voltage signal.Along with engine temperature raises, the amplitude of sensor output voltage signal reduces gradually, when the 2 pin voltages of IC1 are lower than the VREF (Voltage Reference) of 3 pin, IC1 is become by conducting and ends, and the 6 pin current potentials of IC1 are uprised by low, make aerotron T1 conducting by R6, and make relay J 1 adhesive that is connected on the T1 collector loop,

contact

3,4 is connected, thereby control cooling fan of engine machine operation begins to lower the temperature to driving engine.

When IC1 became off condition by conducting state, 3 pin and R5, the W2 between 6 pin that are connected across IC1 forced the current potential on 3 pin to transfer second VREF (Voltage Reference) to.Second VREF (Voltage Reference) is determined by adjusting W2 than the concrete numerical value that first VREF (Voltage Reference) exceeds in Fig. 1 circuit, quits work when engine temperature is reduced to corresponding temperature with the control cooling fan.

Along with driving engine temperature under the effect of cooling fan reduces gradually, the voltage signal of temperature sensor output is uprised by low gradually, and the 2 pin current potentials of IC1 also increase.When 2 pin current potentials surpassed second reference voltage level of 3 pin current potentials, the state of IC1 promptly transferred conducting to by ending.The 6 pin saltus steps of IC1 are that active potential reduces the T1 base potential, and T1 is become by conducting and ends, and relay becomes release position by attracting state, and cooling fan motor quits work.At this moment, the 3 pin current potentials of IC1 revert to first VREF (Voltage Reference) again.

Three terminal regulator IC2 and C5, C6, C7 form a mu balanced circuit, and stable+9V voltage is provided to comparison amplifier.The effect of chemical capacitor C2 is: at automobile by the moment of retrofire, the 12V power supply is gone into circuit by IC2, R3, W1 and R4 loop through 3 terminations of CZ1,3 pin that promptly are engraved in IC1 have been set up first VREF (Voltage Reference), and because the process of charging of chemical capacitor C1, the 2 pin current potentials that make IC1 are lower than the current potential of 3 pin in power connection moment, this will cause IC1 to end and aerotron T1 conducting under the effect of the 6 pin high potentials of IC1 immediately, make relay J 1 adhesive, cooling fan of engine is started working, and this when automobile just starts the misoperation of cooling fan do not wish to take place.Between 2 pin of+9V power supply and IC1, insert chemical capacitor C2,, make 2 pin of IC1 keep a high potential, just avoided the waste motion of above-mentioned cooling fan when start a car when the moment of car engine.And along with the end of C1, C2 process of charging, circuit promptly enters normal mode of operation.

The effect of chemical capacitor C4 is: when automobile power source pent moment, the jump in potential of the signal input part 1 of CZ1 is zero, makes the 2 pin current potentials of IC1 descend, and this variation in a flash will cause that IC1 ends, the T1 conducting, make relay J 1 produce the misoperation of adhesive.By connecting capacitor C 4 over the ground in aerotron T1 base stage, it is constant to guarantee to keep the T1 base potential in the moment of above-mentioned IC1 upset, thereby the relay misoperation when having avoided automobile power source to turn-off is done.

It more than is a preferred embodiment of the present utility model, obviously under design of the present utility model, can make various remodeling, for example can replace with controlled crystal triode and the thyristor that can turn-off, and entire circuit can make monolithic integrated circuit and makes volume littler as the relay of control element.

Claims

1. car engine cooling system adjustable electronic attemperating unit, it comprises casing, temperature adjustment knob and circuit card, it is characterized in that: described circuit card (1) is provided with comparison amplification stage (12), promote level (13), control element (14), indicating circuit (16) and voltage stabilizing level (15), the wherein relatively output of the cooling-water temperature sensor (11) of one of amplification stage (12) input termination automotive engine, relatively the output of amplification stage (12) connects the input that promotes level (13), the output that promotes level (13) is connected with indicating circuit (16) with the input of control element (14), the output of control element (14) is connected with automobile engine cooling fan (17), relatively amplification stage (12) is by voltage stabilizing level (15) power supply, and the remainder on the circuit card (1) is powered by automobile power source (18).

2, car engine cooling system according to claim 1 adjustable electronic attemperating unit is characterized in that: the cooling-water temperature sensor of described automotive engine (11) is an additional temperature element on temperature measurement element in the original engine-cooling system temperature measurement of the automobile part or the car engine cooling water jacket.

3, car engine cooling system according to claim 1 adjustable electronic attemperating unit, it is characterized in that: described relatively amplification stage (12) is made up of comparison amplifier (12a) and reactive circuit (12b), comparison amplifier has two input ends, the output of first input end water receiving temperature sensor (11), the second input termination, first VREF (Voltage Reference), the mouth and the cross-over connection mutually of second input end of reactive circuit (12b) and comparison amplifier (12a), when the comparison amplifier off condition, reactive circuit makes the current potential of second input end convert second VREF (Voltage Reference) to by first VREF (Voltage Reference).

4, car engine cooling system according to claim 3 adjustable electronic attemperating unit is characterized in that: described first VREF (Voltage Reference) is regulated by first potential device (W1) and described second VREF (Voltage Reference) is regulated by second potential device (W2).

5, car engine cooling system according to claim 1 adjustable electronic attemperating unit, it is characterized in that: described relatively amplification stage (12) is the Schmidt trigger that comprises op amp (IC1), promoting level (13) is the relay drive circuit that comprises aerotron (T1), control element (14) is relay (J1), indicating circuit (16) is the circuit series by light-emitting diode (D1) and resistance R 7, and voltage stabilizing level (15) is the mu balanced circuit that is made of three terminal regulator (IC2).