JPS61178547A - Quantity increasing device for accelerating fuel for carburetor - Google Patents

Abstract

PURPOSE:To feed the optimum accelerating fuel by feeding each defined quantity of accelerating fuel to a carburetor in accordance with the detection of initial acceleration, gentle acceleration, and rapid acceleration. CONSTITUTION:The accelerating fuel feeding device 7 of a carburetor 1 is controlled by a feed commanding means 35 in accordance with a feeding quan tity setting means 34, in a feeding device, to feed a defined quantity of accelerat ing fuel. A load detecting means 4 as a throttle valve opening sensor and an idle switch 15 which carries out detection only when a throttle valve 2 is totally closed, are provided on the throttle valve 2. When the idle switch 5 is turned off, a defined quantity of accelerating fuel is fed based on an initial acceleration judging means 31. A small opening of the throttle valve 2 detected by the load detecting means 4 is judged to be a gentle accelerating condition by a judging means 32, feeding a defined quantity of accelerating fuel. Equally, a large open ing of the throttle valve 2 detected by the load detecting means 4 is judged to be a rapid accelerating condition by a judging means 33, to feed a defined quantity of accelerating fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carburetor fuel increase device mainly applied to automatic military engines.

[Prior Art] Carburetors installed in automobile engines are equipped with accelerating fuel to prevent the air-fuel mixture from becoming temporarily lean during acceleration and to supply the rich air-fuel mixture necessary for acceleration. It is common that a volume increasing device is provided.

By the way, as a conventional acceleration fuel increase device.

BACKGROUND ART Mechanical accelerator pumps are in widespread use, which are configured so that a piston or the like moves forward and backward by a certain stroke in conjunction with the opening and closing operations of a throttle valve, and the volume of a pump chamber can be increased or decreased by this forward and backward movement.

However, with just this, the amount of acceleration fuel supplied cannot be controlled, and a fixed amount of acceleration fuel is supplied to the carburetor each time the acceleration pump operates.

Therefore, it is common practice to set the acceleration fuel supply amount to correspond to sudden acceleration when a large amount of fuel is needed. The mixture is unduly enriched, which not only worsens emissions and drivability but also reduces fuel economy.

In order to eliminate such inconveniences, an electromagnetic acceleration pump (SA'P) is provided that applies a variable pulse voltage to a solenoid to move the piston forward and backward by the number of pulses and supplies accelerating fuel. There is an acceleration fuel increasing device that controls and supplies an amount of acceleration fuel as required. As such, patent application No. 58-12921
As shown in No. 7, there is a load detection means for detecting the magnitude of the load on the engine, and a change in the load at regular intervals over the entire operating range based on the magnitude of the load detected by the load detection means. A control means that calculates the speed and issues a command to supply fuel in an amount corresponding to the load change speed when the load change speed exceeds a preset acceleration determination value; There is one that is based on an electromagnetic accelerator pump that is a fuel supply means that supplies the amount of fuel to the carburetor according to the command. If this is the case, acceleration fuel supply can be controlled in accordance with the rate of change in load, so it is relatively effective in improving emissions, drivability, and fuel economy.

However, this method does not take into consideration the case where the engine transitions from a fitting state to a running state or from a deceleration state to an acceleration state. In other words, in such a transition, acceleration fuel must be immediately supplied. The engine may choke, but no acceleration fuel is supplied.

Further, in this device, acceleration is determined based on the rate of change in the magnitude of the load. Incidentally, in order to eliminate the above-mentioned problems such as breathlessness, it is necessary that the acceleration fuel supply be performed in accordance with changes in the load that require the acceleration fuel supply. And, such response is
It is more accurate to judge acceleration based on the changing acceleration rather than the changing speed of the load. However, since this method does not perform acceleration determination based on changing acceleration, the correspondence is not necessarily accurate.

In order to eliminate such inconveniences, it has been considered to perform determination of acceleration in all operating ranges and supply of acceleration fuel based on the change in acceleration of the load. If this is the case, the response to changes in load will be accurate, and the necessary acceleration fuel can be supplied immediately after the change in load. but.

This also has the following disadvantages. In other words, if the acceleration judgment value is set high for sudden acceleration due to a load change, it will not be possible to supply the necessary acceleration fuel during slow acceleration. If the determination value is set to a low value, wasteful fuel is likely to be supplied even when there is no need to supply acceleration fuel. In addition, if the tSX interval of the acceleration change is shortened in order to improve the responsiveness of acceleration fuel supply to changes in acceleration, when the acceleration judgment value is low, the acceleration change can be accurately detected in a region where the throttle opening is small. Because it is difficult to operate, the device is likely to malfunction, and this malfunction also tends to cause wasted fuel to be supplied.Furthermore, the above-mentioned disadvantage of not being able to immediately supply the necessary accelerating fuel at the start of driving or acceleration remains unresolved.

[Problems to be solved by the invention] The present invention has been made with attention to these circumstances, and
Acceleration fuel increase in the carburetor, which can provide appropriate acceleration fuel supply in the entire operating range, thus eliminating engine breathing and improving emissions, drivability and fuel economy more efficiently. The purpose is to provide equipment.

Means for Solving Problem L] In order to achieve the above object, the present invention sets the acceleration fuel increase position a of the carburetor as shown in FIG.

Load detection means (4) for detecting the magnitude of engine load
and an idle switch (5) that detects whether or not the throttle valve (2) is in the closed position, and based on information from this idle switch (5), it is detected that the throttle valve (2) has moved to the open position. an acceleration determining means (31) for initial acceleration, which determines that the acceleration is accelerating when acceleration determining means (32) for slow acceleration; acceleration determining means (33) for rapid acceleration determining acceleration when the change acceleration of the engine load is equal to or greater than a sudden acceleration determination value; Supply amount setting means (
34), a supply command means (35) for issuing a command to supply acceleration fuel based on a set supply amount, and supplying an amount of fuel to the carburetor (1) according to the command from the supply command means (35). The present invention is characterized in that it is equipped with an acceleration fuel supply means (7) for supplying acceleration fuel.

[Function] If the configuration is like this, the throttle valve (2
) shifts to the open position, the shift is detected based on the information from the idle switch (5), and the acceleration determination means (31) for initial acceleration determines that acceleration is occurring, and based on the information from the load detection means (4). If the rate of change in the engine load is equal to or greater than the slow acceleration determination value, the acceleration determination means for slow acceleration (32) determines acceleration, and if the rate of change in the engine load is equal to or greater than the rapid acceleration determination value, the acceleration determination means (32) determines that it is an acceleration. The acceleration determining means (33) determines acceleration, and each of these acceleration determining means (31) and (32
) or (33) is determined to be acceleration, the supply amount setting means (34) sets the supply amount of 21!1st speed fuel, and the supply command means (35) sets the acceleration fuel based on the set supply amount. A supply command is issued, and the accelerating fuel supply means (7) supplies fuel in an amount corresponding to the command from the supply command means (35) to the carburetor (1). Therefore, appropriate acceleration fuel is supplied in any running state, such as when starting running or accelerating, when accelerating Im, and when accelerating suddenly.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

2nd v! i is a schematic configuration explanatory diagram of an acceleration fuel increasing device according to the present invention, in which 1 is a carburetor of an automobile engine;
is the slot 7) of this carburetor 1, 3 is the float chamber,
4 is a throttle opening sensor which is a load detection means for detecting the magnitude of the engine load; 5 is an idle switch; 6 is the acceleration determination means 31 for initial acceleration; the acceleration determination means 32 for slow acceleration; and the acceleration determination means for sudden acceleration. The microcomputer system %7, which plays the roles of means 33, supply amount setting means 34, and supply command means 35, is an acceleration fuel supply means that is controlled by this microcomputer system 6 and supplies acceleration fuel to the carburetor I. . Note that 10 is a water temperature sensor that detects the engine cooling water temperature.

The throttle opening sensor 4 includes an arm 8 protruding from the spindle 2a of the throttle valve 2, a potentiometer 9 that converts the amount of rotation of the arm 8 into an electrical signal, and the output of the potentiometer 9 as a digital electrical signal a. It has an A/D converter (not shown) that converts the data into .

The idle switch 5 includes an actuator 5a that abuts the arm 8 in a movable manner, and is turned on by moving the actuator 5a back and forth.
(Indicates that throttle valve 2 is in the closed position)
-0FF (indicates that the throttle valve 2 is in the open position) is switched and a switch body 5b outputs this change as a signal.

The water temperature sensor 10 detects the engine cooling water temperature and outputs the detected value as a signal C.

The microcomputer system 6 includes a central processing unit 11, a memory 12, and interfaces 13, 14. Then, the throttle opening sensor 4
The signal a from the idle switch 5, the signal C from the water temperature sensor lO, and the signal a from the idle switch 5 are connected to the interface 1.
3, and a drive signal d for driving the fuel supply means 7 once for each output is output from the interface 14. Further, the fuel supply means 7 has an inlet 17 having a reverse 1-hi valve 16 connected to the float chamber 3 via an inlet passage 18, and an outlet 19 connected to an outlet passage 22 having a check valve 21.
The electromagnetic acceleration pump (SAP) 23 opened into the intake passage la of the carburetor l through the drive signal d input from the microcomputer system 6 marked # is received, and the A driver 24 that drives an acceleration pump 23 is provided. The acceleration pump 23 is located in the pump chamber 2
A piston 27 is accommodated in a cylinder 26 forming a
The piston 27 is configured to move forward and backward by the biasing force of a spring 28 and the electromagnetic attraction force of a solenoid 29 to perform a pump function. Also, driver 2
4 is.

Based on the drive signal d, a pulse voltage of, for example, about 20 Hz is applied to the solenoid 29 to move the piston 27 of the acceleration pump 23 forward and backward.

FIGS. 3 and 4 show schematic flowcharts of a program for operating such an accelerating fuel increase device. That is, according to this program, in the main routine shown in FIG. Throttle opening degree θ, throttle change speed V, throttle change acceleration α
, and a temperature coefficient KWL (see FIG. 5) corresponding to the engine cooling water temperature detected by the water temperature sensor lO are input from the memory 12. The rate of change V is a value calculated by comparing the initial throttle opening θ with the throttle opening θ1 after a unit time (llo*5ec). In addition, the change acceleration α is calculated by detecting the throttle opening every 301 seconds from the detection of the initial throttle opening θ, comparing the latest detected throttle opening with the throttle opening 301 seas ago, and calculating the rate of change. , which is the value calculated every unit time (30s+5ac) by comparing the latest rate of change calculated in this way with the rate of change calculated 30m5ec ago.Next, in step 52, S is calculated based on the information from the idle switch 5. The switch 5 changes from ON to O.
It is determined whether or not it has been switched to FF. If it is switched to OFF, it is determined that acceleration is occurring, and in step 53 the amount of accelerating fuel to be supplied to the carburetor l is nl (n+ =lX
KWL times) and then proceed to step 54. Meanwhile,
If it is not switched to OFF, the process proceeds to step 54 without performing such settings.
c) Determine whether it is 23 or more. And α is α
If it is 1 or more, it is determined that there is a sudden acceleration, and in step 55, the acceleration fuel supply amount n2 (n2 = 4XKWL times) is set, and then the process proceeds to step 56. If α is less than 61, it is determined that there is no sudden acceleration. However, step 56 is performed without making such settings.
In step 56, the initial throttle opening θ
However, opening degree I (less than 17,08°), opening degree ■ (17,0°
8° or more and less than 22.82'] or opening degree If (2
2, 82° or more).

If the throttle opening degree θ corresponds to the opening degree I, the process proceeds to step 57, if it corresponds to the opening degree ■, the process proceeds to step 58, and if it corresponds to the opening degree ■, the process proceeds to step 59. , if the process proceeds to step 57, the rate of change V is Nl1l, the slow acceleration judgment value v, (2,88°
/Hmgec) or more. If the speed of change V is equal to or greater than the slow acceleration/distraction determination value v, it is determined that the engine is accelerating, and the process proceeds to step 60 where the acceleration fuel supply amount ni (, ni = 2XK times) is set. Then, the process returns to step 51. On the other hand, if the rate of change V is less than the slow acceleration determination value v1, it is determined that there is no acceleration, and the process returns to step 51 without performing such setting.

Further, if the process proceeds to step 58, the rate of change V
is the second IIMJ speed judgment value v2 (2,52'/9
0m5ec) or more. and,
When the rate of change V is equal to or greater than the slow acceleration determination value 72, it is determined that acceleration is occurring, and the process proceeds to step 61 to set acceleration fuel supply uni (ni = 3XKWL times), and then returns to step 51. On the other hand, if the speed of change V is less than the acceleration determination value v2, it is determined that there is no acceleration,
The process returns to step 51 without performing such settings. Also.

When the process proceeds to step 59, the change speed ma is the third slow acceleration judgment value v3 (2,18' 180 m5ec
) or more. If the speed of change V is equal to or higher than the *m speed determination value v3, it is determined that acceleration is occurring, and the process proceeds to step 62 where acceleration fuel supply is started.
After setting (ni = 3XK% [, times), the process returns to step 51. On the other hand, if the rate of change V is less than the slow acceleration determination value v3, it is determined that there is no acceleration, and the process returns to step 51 without performing the setting.

Also, in the interrupt routine shown in Figure 7J14.

The main routine is interrupted every 50 seconds, and first,
The acceleration fuel supply amount fll set in step 71
, n2. Then, in step 72, read these nl
l, 7. It is determined whether each nl is greater than 0.

Then, if nl = n2 = ng = 0, the interrupt is terminated, and! 11. 2. If even one of nl is greater than O, the process proceeds to step 73. In step 73, one pulse of pulse voltage is applied to drive the electromagnetic acceleration pump 23 once. The process then proceeds to step 74, where the acceleration fuel supply amount n1. n2. Decrease n:+ by l each to 3E (however, il, n2t, nl are all ≧0) and end the interrupt.

Next, the operation of this device will be explained.

After the vehicle is started, the throttle opening sensor 4 outputs a signal 5L@a indicating the throttle opening, the idle switch 5 outputs a signal 01l-OFF, and the water temperature sensor 10 outputs a signal C indicating the engine cooling water temperature. are respectively input to the interface 13 of the microcomputer system 6, and the throttle opening information is stored in the memory 12 every 30 aecs, and the ON-OFF information of the idle switch 5 and the cooling water temperature information are sequentially stored in the memory 12. Further, the speed of change V and the acceleration of change α of the throttle opening degree are calculated and sequentially stored in the memory 12. Furthermore, a temperature coefficient KWL corresponding to the engine cooling water temperature is also stored in the memory 12. Then, among the throttle openings, the initial throttle opening θ, the rate of change Ma, the acceleration rate α, and the temperature coefficient KWL corresponding to the cooling water temperature are input to the central processing unit 11 (step 51); For example, when the engine changes from a fitting state to a running state and the idle switch 5 changes from ON to OFF,
If the central processing unit 11 does not determine acceleration, step 5
2), set the acceleration fuel supply amount n+ (nt xlXKWL times) (step 53), and if the changed acceleration α is greater than or equal to the sudden acceleration determination value α2, the central processing unit 111 determines that there is an acceleration; 54), set the acceleration fuel supply amount H2 (n2x4xKWL times) (step 55), and also set the initial throttle opening θ to the opening degree, ■
, ■ (step 56), when acceleration is performed from a low load range such as opening (less than 17.08 degrees), the speed of change V is the first II! 710
If the speed determination value V+ (2,88'/90m5ec) or more, the central processing unit 11 determines that the acceleration is occurring (step 57), and the acceleration fuel supply amount na (ni = 2).
XKWL times) (step 60), and the opening degree θ is set to the opening degree II (17.08° or more 22.112
When acceleration is performed from a load range in which the speed is less than
2'/90m5ec) or more, the central processing unit 11 determines that it is an acceleration, and in step 58) sets the acceleration fuel supply amount n3 (nl x 3XKWL' times).
Step 61), and the opening degree θ is the opening degree III (2
2.82" or more), if the rate of change is equal to or higher than the third slow acceleration determination value va (2.18°790m5ec), the central processing 413111 is determined to be acceleration, step 59), acceleration fuel supply amount nl (ni = 3XKWL
(step 62).

On the other hand, the central processing unit 111 controls the acceleration fuel supply amount I
ll, n2+ ni are read every 50m5ec (step 71), and it is determined whether these nl, n2s nl- are greater than 0 or not (step 72),
If even one of these nl", n2, and nl is larger than O, a drive signal d is issued via the interface 14, and each time the driver 24 drives the electromagnetic acceleration pump 23 with a pulse voltage l pulse 7. minute, that is, once (step 73), and the electromagnetic acceleration pump 23
After driving once, each M speed fuel supply record nl read above is
, n7. subtract l from each n3 (step 74
), steps 71 to 74 are repeated, and the acceleration fuel supply in+, n2. When n becomes all 0, driving of the electromagnetic acceleration pump 23 is terminated. The driving of the electromagnetic acceleration pump 23 is terminated not only when the acceleration fuel supply amount nl and 112 * n 3 become 0, but also when the idle switch 5 is turned on. In some cases, the engine may be stopped.

Acceleration fuel is supplied in this way, but in this device, N-fuel is supplied when the engine transitions from a fitting state to a running state or from a deceleration state to an acceleration state. Therefore, there is no inconvenience that a pause occurs during such a transition.

Furthermore, the throttle opening change acceleration α is changed for a short period of time (30
1 sec), and the acceleration fuel is supplied when the change acceleration α is equal to or higher than the sudden acceleration judgment value α1 set to a relatively high value. Therefore, the acceleration fuel can be safely detected when the engine load suddenly increases. In addition, when the engine load is slowly accelerating, the acceleration fuel supply amount n2 is not set, and there is no inconvenience such as deterioration of fuel economy due to the aforementioned malfunction.Moreover, the acceleration fuel supply jt n Since there are many 2 (A X KIIL times), there will be no shortage of supply.

Furthermore, *acceleration determination during acceleration is performed based on the magnitude of the throttle opening change rate V per unit time, and the acceleration determination value is varied depending on the magnitude of the initial throttle opening θ, and 7ITI'IiL fuel Since the supply amount of fuel is also varied, it is possible to supply finely tuned acceleration fuel according to the degree of acceleration and the magnitude of the load at the start of acceleration during slow acceleration. In other words, when the throttle opening is small and the load is light, even if the acceleration fuel supply is limited to only when relatively rapid acceleration is performed, the engine will not breathe, etc. is set at a relatively high value. This eliminates the possibility that accelerating fuel is supplied even when the accelerator is depressed slowly, and deterioration of fuel economy can be prevented. Moreover, in this embodiment, the electromagnetic acceleration pump 23 is driven by the ZXK.
Because it is only WL times, even when acceleration fuel is supplied, more fuel than necessary is not supplied.In addition, when the throttle opening is relatively large and the load is high, acceleration fuel is supplied even if relatively slow acceleration is performed. If the fuel is not supplied, a temporary fuel shortage will occur, so the slow acceleration determination value v3 is set to a relatively low value. Therefore, fuel for acceleration is supplied even with a relatively small step on the accelerator.
Inconveniences such as engine failure are resolved. Moreover, in this example.

At that time, the number of times the electromagnetic acceleration pump 23 is driven is 3 x KwL.
Since this setting is set to a relatively large number of times, drivability can be improved and excellent acceleration performance can be demonstrated. Furthermore, when the load is between the above two load ranges, by setting the slow acceleration judgment value v2 to an appropriate value higher than the slow acceleration judgment value v1 and lower than the slow acceleration judgment value v3, it is possible to It is possible to perform accelerated fuel supply.

In addition, in this embodiment, the amount of fuel supplied is changed in relation to the engine cooling water temperature, so there is no problem such as poor drivability due to not being supplied with the necessary amount of fuel when the water temperature is low.

Note that the present invention is of course not limited to the above-mentioned embodiment, and also includes first-order modifications.

The load detection means is not limited to a throttle opening sensor that detects the opening of the throttle valve, but may also be an intake pressure sensor that detects intake pipe negative pressure, and the acceleration judgment value also depends on the throttle opening change rate and the throttle opening. It is not limited to the degree change acceleration, but may be, for example, the negative pressure change rate and the negative pressure change acceleration.

In addition, the load stage and slow acceleration judgment value at the start of acceleration are 3.
It is not limited to the type, and may be of type 1, type ii, type 2s, or four or more types.

Furthermore, the sudden acceleration determination value is not limited to one type.

Furthermore, in the above embodiment, not only the acceleration judgment value is made different depending on the throttle opening degree at the start of acceleration, but also the amount of acceleration fuel supplied is made different. For example, only the acceleration determination values may be classified into a plurality of categories.

Furthermore, although the acceleration fuel supply amount does not have to be changed in relation to the cooling water temperature, more appropriate acceleration fuel supply can be achieved if the acceleration fuel supply amount is changed in relation to the cooling water temperature.

[Effects of the Invention] As explained above, the present invention can supply acceleration fuel at the start of running or acceleration, and can also supply appropriate acceleration fuel during both slow acceleration and sudden acceleration, so that the engine It is therefore possible to provide an accelerating fuel increase device for a carburetor, which can eliminate inconveniences such as suffocation, and can more efficiently improve emissions, drivability, and fuel economy.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall configuration diagram for clearly explaining the invention, FIG. 2 is a schematic configuration diagram, and FIG.
4 are flowcharts for explaining the control procedure, and FIG. 5 is a diagram showing the relationship between engine cooling water temperature and temperature coefficient. 1... Carburetor 2... Throttle valve 411 conflict/Load detection means (throttle opening sensor) 5 a*a Idle switch 6/Microcomputer system 7 fist...Acceleration fuel supply means 31-... Acceleration determination means 32 for initial acceleration...Acceleration determination means 33Φ for slow acceleration.Acceleration determination means 34@ for rapid acceleration.Supply amount setting means 35.e.Supply command means θ.Flash initial throttle opening degree V- ... Slow/Tor opening change speed α... Throttle opening change acceleration vI, v2. v3... - Slow acceleration judgment value α,...φ Rapid acceleration judgment value Figure 1

Claims (1)

[Claims] A load detection means detects the magnitude of the engine load, an idle switch detects whether the throttle valve is in the closed position, and based on information from the idle switch, it is detected that the throttle valve has moved to the open position. an acceleration determination means for initial acceleration that determines acceleration when the load is detected; and an acceleration determination means for slow acceleration that determines acceleration when the rate of change in the load of the engine is equal to or higher than a slow acceleration determination value based on information from the load detection means. means, acceleration determining means for sudden acceleration for determining acceleration when the change acceleration of the engine load is equal to or greater than a sudden acceleration determining value; and acceleration determining means for determining acceleration fuel supply when each of these acceleration determining means determines acceleration. a supply amount setting means for setting a supply amount; a supply command means for issuing an instruction to supply acceleration fuel based on the set supply amount; and an acceleration fuel supply for supplying an amount of fuel to the carburetor according to the command from the supply command means. 1. An accelerating fuel increasing device for a carburetor, comprising means.