JPS6187957A - Auxiliary fuel feeding method in time of engine acceleration - Google Patents

Abstract

PURPOSE:To prevent bad fuel consumption and any drop in drivability or the like from occurring, by feeding an engine with auxiliary fuel only at a time when the elapse of time at an idle position of a throttle valve is more than the specified time set in response to the time elapsing at the idle position in time of gear changing. CONSTITUTION:A solenoid-operated fuel pump 9 is installed in a carburetor 2, and this pump is made up of installing an auxiliary fuel nozzle 17 or the like which discharges fuel inside an operating chamber 14 to a suction passage 3 via a check valve 16 on a fuel discharge passage 15 with movement of a position of a piston being unitized with a plunger 12 resisting to energizing force of a spring 11 excited by a solenoid coil 10. And, the solenoid coil 10 is controlled by an engine control unit 27 on the basis of each output of an idle switch 7, a throttle opening sensor 21, a water temperature sensor 23, an engine speed detecting sensor 24, etc. At this time in the case where a throttle valve 4 is opened from idle opening and the specified time elapses, the fuel pump 9 is driven as many as the setting number of times at that point that the idle switch 7 varies to OFF.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of application above fLt) The present invention is applied to the A5 during acceleration and to the carburetor! Acceleration of the engine when the auxiliary fuel supply pump is activated to supply auxiliary fuel to the engine. +[iRegarding auxiliary fuel supply method.

(Conventional technique 1 (j) Since tl, the method of supplying auxiliary reinforcement 1 at acceleration +1. The acceleration is compared with a reference point determined in advance by 2Ω, and the auxiliary fuel supply pump is operated for a set number of times based on the comparison result.
For example, as described in Japanese Unexamined Patent Application Publication No. 50-97735, there is a method of driving the engine a set number of times by multiplying the previous comparison result by a coefficient found in the [11] state of the engine.

In the case of such an auxiliary fuel supply method during acceleration, the purpose is to quickly supply auxiliary fuel during acceleration, so the fuel pump is driven a set number of times each time the throttle valve is removed from the idle opening position to supply auxiliary fuel. is co-fed to the engine, and as a result, not only is the fuel pump driven during gear changes that do not require the supply of auxiliary fuel, resulting in poor fuel efficiency, but also the throttle valve closes within 10 hours due to the driver's accelerator operation, etc. If it is repeatedly opened and closed, it will become overrich and driveability will deteriorate, and in the worst case, the plug may get wet and the engine may stall.
In order to drive the fJt fuel pump, it takes 8.1 minutes from when the accelerator pedal starts to be heard until the auxiliary light supply pump is activated, resulting in a time lag in the supply of fuel, causing the engine to breathe during acceleration. It had the disadvantage of becoming old if it caused car knocks such as joints.

(Purpose of f-jinmei) The present invention provides d3t at the idle position 1^ of the throat valve.
A predetermined value set corresponding to the idle position v5 elapsed time at the time of gear change. By providing a method for supplying the auxiliary lamp F during engine acceleration, which supplies the auxiliary lamp 1, the fuel pump is driven even during gear changes when the supply of the auxiliary lamp 1 is unnecessary, resulting in poor fuel efficiency and reduced drivability. The object of the present invention is to prevent the occurrence of ence 1-, etc., and also to prevent the car knock phenomenon of acceleration 0-'I breath-holding due to the [1, j 18 I ff deviation of the auxiliary fuel supply.

(Komyo's (j11 formation)) As shown in FIG. The elapsed time required for d3i to change gear
When it is determined in step SO2 that the idle position is equal to or greater than the predetermined interval set corresponding to the idle position elapsed time Di, in step SO3, the auxiliary fuel supply pump is driven a set number of times to supply auxiliary fuel to the engine, and in step SO3 The present invention provides a method for supplying auxiliary fuel during acceleration of an engine in which the auxiliary light is not supplied to the engine when it is determined in S○2 that the distance is below a predetermined distance.

(Structure of an Embodiment of the Invention) Next, the structure of a one-piece, one-claw example of the invention will be described with reference to FIGS. 2 to 6.

An intake passage 3 that supplies a gaseous air from a carburetor 2 to the engine 1 has f
ail <The throttle valve 4 is biased in the valve closing direction by a spring (not shown)! The idle switch of the throttle valve 4 is determined by an idle switch (not shown), and when the throttle valve 4 is in the idle opening position, the operating lever 6 fixed to the shaft 5 of the throttle valve 4 moves to the idle switch 7. By pressing the rod 8, the idle switch 7 outputs an on signal indicating that the throttle valve 4 is at the idle opening, and when the throttle valve 4 is opened from the idle opening, the idle switch 7 outputs an on signal indicating that the throttle valve 4 is at the idle opening. An off signal is output to indicate that the power is on.

In addition, the carburetor 2 has an electromagnetically actuated fuel pump 9, this No. 1 combination, and a spring 11 which is energized by f=J of the electromagnetic coil 10.
Due to the movement of the piston 13 of the plunger 12 and the piston 13 to the left in FIG. 17 is exposed to the intake passage 3, the electromagnetic coil 10 is not energized, and the piston 13 integrated with the plunger 1712 moves to the right in FIG. 18
A fuel pump 9 is attached to suck internal combustion r4 from a check valve 2o on a fuel suction passage 19 to an actuator 14, and an electromagnetic coil 10 of the fuel pump 9 is connected to an idle switch 7 and a shaft 5 of a throttle valve 4. a throttle opening sensor 21 that interlocks to generate an output corresponding to the opening of the throttle valve 4; a water temperature sensor 23 that is attached to the water jacket 22 of the engine 1 and generates an output corresponding to the cooling water temperature of the engine 1; The output from the engine rotation speed detection sensor 24 such as an ignition coil that generates an output corresponding to the engine rotation speed is input, and the power supply from the battery 25 is turned on and off by the ignition switch 26. It is controlled by the output from an electrical control circuit for controlling the engine, commonly known as the ECU 27.

Next, Figure 3 shows a specific example of ECtJ27 where city is 1 (0M
A pulse signal with a frequency corresponding to the engine speed from the engine speed detection sensor 24 is inputted via a waveform shaper 30 to a microcomputer, commonly known as the CPU 29, which is controlled according to the program No. 28. The analog signal corresponding to the throttle opening from the sensor 21 and the analog signal corresponding to the engine temperature from the engine temperature 7!3 are A/D'a? Vessel 31
The on/off signal from the idle switch 7 is input via the I10 boat 33 in a state converted to a digital engine via the I10 boat 32, and the... 9 electromagnetic coil 10 is CP
It is controlled by the output from the I10 port 34 of the U 29 via the drive circuit 35.

(Effects of the real/one color example) Next, the effects of the five real fruit examples will be explained with reference to the flowchart of FIG.

! ! In Fig. 4, throttle valve 4 is at idle 11.
The operating condition of the engine when the idle switch 7 is turned off after it has been opened! This is a diagram for driving the fuel pump 9 according to the program set in the CPLI 29 in response to the idle switch 7 in step 101.
The idle switch change flag is used to determine whether or not the idle switch change flag has changed.If the idle switch change flag is set to 1, there is a change in the idle switch 7 by 41, so the 10g goes to the next engine control 00 routine, and the idle switch change flag is checked. flag is 1
If so, the idle SW e flag is cleared in step 102 to prepare for the next change in the idle switch 7, and the idle switch 7 is turned on/off in step 03.
The off state is determined, and if it is on, the CPU
The internal timer of 29 is decremented by J, and the timer is decremented by the gear change. After the delay time shown in FIG. It is determined in step 105 whether or not the delay time T
If the period has not passed, the program will start the next engine control 2 without supplying auxiliary fuel when the idle switch 7 is off.
Proceeding to the D routine, if the delay interval Te has elapsed, in step 106 the engine rrM shown in FIG.
After calculating the correction factor viK from the water temperature map corresponding to the f3 state, step 107'c sets the fuel pump 9 drive setting υ
No number of times? 11iIIIE coefficient K is corrected by 17) after setting the number of drives α to 0, and setting α in the fuel pump 9 drive counter in step 108 to adjust the auxiliary fuel when the idle switch 7 is off. 4
supply.

In this way, the predetermined time T is set each time the throttle valve 4 is closed to the idle opening, and the predetermined time T is set when the throttle valve 4 is opened from the idle opening to the predetermined 11i 1! It is determined whether il T has elapsed or not, and when the tit idle switch 7 changes from on to off when the predetermined 11 periods have elapsed +1. As shown in Fig. 5, the fuel pump 9 is driven a constant number of times and the light from the engine idles, 111.
1 In response to the current situation, the emergency HL auxiliary fuel is immediately supplied (l) and becomes close to the conventional auxiliary fuel IJt supply (I phase ■, car knock is prevented, In the case of a gear change after a predetermined 1.5 intervals, the idle 111 degrees 7 changes from on to A]C]5 to Figure 2 T' m 'l J, Sea urchin M+ II ,!lE
FI 1. L supply n 'J'', the fuel efficiency is improved compared to this model, and it also has the effect of eliminating engine stalling, poor driveability, etc. caused by abnormal drive of the fuel pump 9 due to chatter of the idle switch 7, etc. be.

In addition, in this embodiment, although it is detected that the throttle valve 4 is separated from the idle opening, the idle switch 7 is
However, even if the throttle opening sensor 21, intake pressure sensor, and vacuum switch cap are used in place of the idle switch 7, it is possible to detect the opening of the throttle valve 7 and perform Ll control in the same manner as described above. ,ECLJ27
In addition to a microcomputer, any electrical 1991 circuit can be used for this. In this embodiment, a predetermined interval T between n and ``I'' is set each time the idle position F7 is turned from off to on. As soon as the idle switch 7 changes from on to off, it is determined whether the throttle valve 4 is at the idle opening for a predetermined time TI!, but it is determined whether the predetermined time T stored in the computer in advance has elapsed. The determination can also be made when the throttle valve 4 is at the idle opening position.

(Effects of the Invention) The present invention provides that the elapsed time 115 of the idle position of the thrower I/le valve corresponds to the elapsed time of the idle position of the gear engine, and the a'l'
By supplying auxiliary fuel to the engine only when the throttle valve changes from the idle position to the open state, the fuel pump is driven during a gear change that does not require the supply of auxiliary fuel. Prevents defects, decreased drivability, and R,'l''+7, and prevents car knocks due to acceleration caused by 8 it between I+ and ``I of auxiliary fuel supply. It has the effect of creating a mouthful.

[Brief explanation of drawings]

Figure 1 i;t A<a system diagram showing the entire invention;
2nd r (l is an explanatory diagram of the example 11a of the book 51 Ming, 3rd
The figure is its electrical circuit diagram, Figure 4 is its flow chart,
Figure j) and Figure 6 show the operation 14t! Figure 1. SO1~SO3...Step 1 Figure cutting 3 Figure 4 Figure cutting 5 Plane Δ1 Mo 6 Figure ↑ Large "・U・; 21rotsu, m (shi) ■° Continuation
N11i ir,' i 曾4 (7'Nishiko'
II) In the 1980s, / July 7th - Sunday, January 11th display Showa! Relationship with F4 Special Revision Application No. 1/7Z No. 2 No. 3, MiF Oriru Right 1 ■ 1 Sei-1 Applicant

Claims (1)

[Claims] When the throttle valve changes from the idle position to the open state, auxiliary fuel is supplied to the engine when the elapsed time in the idle position of the throttle valve is equal to or longer than a predetermined time set corresponding to the elapsed time in the idle position at the time of gear change. A method for supplying auxiliary fuel during acceleration of an engine, characterized in that the auxiliary fuel is not supplied to the engine when the time is less than a predetermined time.