JPS63113134A - Throttle valve control device of car mounted internal combustion engine - Google Patents

Abstract

PURPOSE:To improve start-up acceleration performance of a car while maintaining normal idle engine speed at low speed by opening a throttle valve so as to keep an idle opening of the throttle valve above a specified opening after the elapse of a specified time when the start-up of the car is detected based on car-speed. CONSTITUTION:Connected to a car-speed pulse generator 10, a current sensor 17 for sensing electrical loads on headlight, air conditioner, etc., an air conditioner detecting switch 18, a power steering detecting switch 19, a control circuit 20 controls negative pressure applied to the pressure receiving chamber 3c of a throttle-opener 3 by means of a three-way solenoid valve 7 so as to obtain the optimal idle opening of the throttle valve in accordance with loaded condition. When the start-up of a car is detected based on detection value sensed by the car-speed pulse generator 10, the control circuit operates a timer, gives a throttle valve operating command for a specified period of time, thus controlling the opening of a throttle valve 2.

Description

[Detailed description of the invention] Technical field The present invention relates to a throttle valve control device for a vehicle internal combustion engine.

BACKGROUND ART The engine rotational speed of an internal combustion engine during idling operation is usually set low to improve fuel efficiency. Therefore, when starting a vehicle, engine torque may be insufficient and good starting acceleration performance may not be obtained. As a conventional example of improving this starting acceleration, a throttle valve control device that detects clutch operation and increases the throttle valve opening by a predetermined opening is disclosed in Japanese Patent Application Laid-Open No. 58-20683.
It is disclosed in Publication No. 9.

However, in such conventional throttle valve control devices, when the vehicle starts, torque is transmitted to the wheels by a so-called half-clutch, so the latch operation detection critical point and the point in time when torque transmission is established or not established do not coincide with the engine. There was a possibility that the engine would blow up or the engine would stall, resulting in warpage and deterioration of drivability.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a throttle valve control device that can reliably obtain good starting acceleration performance when starting a vehicle.

The throttle valve control device of the present invention has a detection means for detecting vehicle speed, and the idling opening of the throttle valve remains at or above the predetermined opening from the time when the start of the vehicle is detected based on the output of the detection means until after a predetermined period of time has elapsed. The feature is that the throttle valve is driven to open so that the valve is opened.

Example Embodiments of the present invention will be described below with reference to the drawings.

1 schematically shows an on-vehicle internal combustion engine equipped with the throttle valve control device according to the invention shown in FIG. 1; In this figure,
The throttle valve 2 of the carburetor 1 opens in conjunction with an accelerator pedal (not shown) and is driven by a throttle opener 3 that opens a diaphragm 3a. The diaphragm 3a of the throttle opener 3 and the throttle valve 2 are connected by a rod 3b so as to be interlocked. The throttle opener 3 has a pressure receiving chamber 3c of which a diaphragm 3a forms a part, and a spring 3d within the pressure receiving chamber 3c is biased in a direction to press the diaphragm 3a outward, that is, in a direction to close the throttle valve 2. are doing. Further, the pressure receiving chamber 3c communicates with the intake pipe 5 downstream of the throttle valve via the negative pressure supply passage 4. A three-way solenoid valve 6 is provided in the negative pressure supply passage 4, and the solenoid valve 6 closes the intake pipe 5 side of the negative pressure supply passage 4 when the solenoid 6a is not energized, and closes the intake pipe 5 side of the negative pressure supply passage 4. Atmospheric pressure is supplied to the solenoid 6a through the filter 7, and when a current is supplied to the solenoid 6a and the solenoid 6a is energized, the negative pressure supply passage 4 is communicated and the supply of atmospheric pressure is stopped.

On the other hand, 10 is the output shaft of the vehicle transmission (not shown)
The vehicle speed pulse generator 10 is a vehicle speed pulse generator that generates pulses according to the rotation of the control circuit 2 along with the solenoid valve 6.
Connected to 0. The control circuit 20 further includes a current sensor 17 consisting of a resistor that detects the load current to an electrical load such as a headlight or a near conditioner (hereinafter referred to as an air conditioner) as a voltage, and an air conditioner detection sensor that is linked to an air conditioner activation switch. The switch 18 is connected to a power steering detection switch 19 that detects the operation of a power steering device (not shown) of the vehicle.

The detection switches 18 and 19 supply voltage Vs to the control circuit 20 when turned on.

As shown in FIG. 2, the control circuit 20 includes a level conversion circuit 21 that converts each output level of the current sensor 17, an A/D converter 23 that converts the signal output from the level conversion circuit 21 into a digital signal, A waveform shaping circuit 24 that shapes the vehicle speed pulse output from the vehicle speed pulse generator 10, a level conversion circuit 26 that converts the output levels of the detection switches 18 and 19, and a digital input camosulator that converts the converted output into digital data. 27, a drive circuit 28 that drives the solenoid valve 6, a CPU (central processing circuit) 29 that performs digital calculations according to the program, and a ROM in which various processing programs and data are written in advance.
30 and a RAM 31. A/D converter 2
3. Waveform shaping circuit 24, digital input camosulator 2
7. Drive circuit 28, CPU 29, ROM 30 and RAM
31 are connected to each other by a bus 32.

The CPU 29 also uses three timers TA to TC (not shown).

In this configuration, load current information is alternatively transmitted from the A/D converter 23, and vehicle speed pulses whose waveforms have been shaped from the waveform shaping circuit 24 are alternatively transmitted to the digital input camosulator 27.
The on/off signals of the detection switches 18 and 19 are supplied to the CPU 29 via the bus 32, respectively. The generation period of the vehicle speed pulse becomes shorter as the vehicle speed becomes higher. The CPU 29 reads each piece of information by executing a processing program, and issues a throttle valve drive command or a throttle valve drive stop command to the drive circuit 28 based on the information. The drive circuit 28 applies N to the solenoid 6a of the three-way solenoid valve 6 in response to the throttle valve drive command.
By supplying current, the three-way solenoid valve 6 is driven to connect the negative pressure supply passage 4, and in response to the throttle valve drive stop command, the current supply to the solenoid 6a is stopped to supply negative pressure to the pressure receiving chamber 3c side. Atmospheric pressure is supplied to the passage 4.

Next, the operation of the idle speed control device according to the present invention will be explained with reference to the operation flow diagram of the CPU 29 shown in FIG.

The CPU 29 first reads the load current IL and determines whether the load current IL is larger than a predetermined current ILI (for example, 6 A) (step 51). When IL>ILI, a throttle valve drive command is issued to the drive circuit 28 (step 52). When IL≦ILI, the air conditioner detection switch 18 detects whether the air conditioner is operating or not.
The determination is made based on whether it is on or off (step 53). If the air conditioner detection switch 18 is on, the air conditioner is operating, and in order to promote battery charging, a throttle valve drive command is issued to the drive circuit 28 by executing step 52, and the air conditioner detection switch 18 is turned off. If so, it is determined whether the air conditioner is not operating and the power steering device is operating based on whether the power steering detection switch 19 is on or off (step 54). Power steering detection switch 19
is on, the power steering device is in operation, and a throttle valve drive command is generated to the drive circuit 28 by executing step 52 to promote battery charging. If the power steering detection switch 19 is off, the power steering device is in operation. The steering device is inactive, and it is determined based on the vehicle speed VH whether or not the vehicle speed VH is 0 (step 55).
). V)-1-0, the vehicle is in a stopped state, so the flag FVρ should be reset to O (step 56), and the measured value TIU of the timer TA is set for a predetermined time TA (for example, 1
sec) and determines whether it has reached 0 (step 57). Before starting the vehicle, the timer TA is set for a predetermined time TA.
is not set, so it is TT u-o, and the drive circuit 2
A throttle valve drive stop command is generated for 8 (step 5
8).

If V)l>O in step 55, the vehicle has started, so it is determined whether the flag F'vp is equal to 1 (step 59). If it is immediately after starting, Fvp
= 0, the timer TA is set to a predetermined time TA to start down measurement (step 60), and the flag F'vp is set to 1 to indicate that the start determination has been completed (step 61). Then, a throttle valve drive command is generated to the drive circuit 28 (step 52). If Fvp=1 in step 59, the vehicle has already started, so after detecting Vs>0, it is determined from the measured value Tru of timer TA whether a predetermined time TA has elapsed (step 57
). After detecting Vs>0, if the predetermined time TA has not elapsed, a throttle valve drive command is generated (step 52), VH>
After the 0 detection, when a predetermined time TA has elapsed, a throttle valve drive stop command is generated (step 58). The CPU 29 repeatedly executes this operation.

The drive circuit 28 drives the three-way solenoid valve 6 in response to the throttle valve drive command, stops the supply of atmospheric pressure to the negative pressure supply passage 4, and connects the negative pressure supply passage 4, so that the negative pressure inside the intake pipe 5 is reduced. Pressure is supplied to the pressure receiving chamber 3c of the throttle opener 3 via the negative pressure supply passage 4.
supplied to Since this supplied negative pressure is greater than the biasing force of the spring 3d, the diaphragm 3a is attracted toward the pressure receiving chamber 3C and reversed, and in conjunction with this, the throttle valve 2 is opened to a predetermined opening θ.
Only 2 valves open. By opening the throttle valve 2, the amount of air-fuel mixture supplied from the carburetor 1 to the engine increases, and the engine speed increases.
In other words, the idle speed increases. After the throttle valve 2 opens by a predetermined opening degree θ1 due to generation of the throttle valve drive command, a throttle valve drive stop command is generated when a predetermined time TA has elapsed. In response to this throttle valve drive stop command, the drive circuit 2
8 does not drive the three-way solenoid valve 6, so the intake pipe 5 side of the negative pressure supply passage 4 is closed, and the pressure receiving chamber 3 of the negative pressure supply passage 4 is closed.
Atmospheric pressure is supplied to the c side to make the inside of the pressure receiving chamber 3C equal to the atmospheric pressure. As a result, the throttle valve 2 is brought into a closed state by the biasing force of the spring 3d.

Next, the operation for detecting the vehicle speed vH will be explained according to the flowchart shown in FIG.

The CP'U 29 first determines whether a vehicle speed pulse has occurred (step 71). When a vehicle speed pulse occurs, a predetermined time TB (for example, 2.0 se
c) to measure down (step 72), and set timer TC to a predetermined time Tc (Ts > Tc, e.g. 16μ5ec) to measure down (step 72).
Step 73). If no vehicle speed pulse is generated, it is determined whether the measured value Tvo of the timer TB has reached 0 after measuring a predetermined time TB (step 74). When Tvo>O, it is determined whether or not the measured value TVI of the timer TC has reached O after measuring the predetermined time TC (step 75).
, Tv+-0, a predetermined time Tc is set in the timer TC to cause down measurement (step 76). Then, 1 is added to the counter value N (step 77), and the counter value N is the upper limit value Nwax (for example, FF in hexadecimal).
FF) (step 78)
. If N>Nff1aX, the counter value N is made equal to the upper limit value Nwax (step 79). In step 74 the TV. - When 〇, variables N1 and N2
are both equal to the upper limit Nff1ax, and the variable N1 is set to R
Save variable N2 to memory location A1 of AM31 and RAM31.
(step 80), adds each variable N1 to the variable N, and divides the addition result by 2 to calculate the detected value W, which is the reciprocal of the vehicle speed vH (step 81).

On the other hand, after executing step 73, it is determined whether the flag FN is equal to 1 (step 82). If it is FN-0,
The variable N1 is made equal to the counter value N1 at the time of the previous execution of this routine, that is, the counter value N obtained immediately before in step 77 or in step 77, and is written in the memory location AI (step 83), and 1 is set in the flag FN. set (step 84). If FN-1, set the variable N2 equal to the counter value N at the time of the previous execution of this routine and move to memory location A.
2 (step 85), and reset the flag FN to 0 (step 86). After executing step 84 or 86, initialize the counter value N to 0 (step 87),
The detected value W, which is the reciprocal of the vehicle speed vH, is calculated by reading the variables Nl and N2 from the memory locations A1 and A2, adding the variables N1 and N2, and dividing the addition result by 2 (step 81). Here, the calculated detected value W is read in step 55 and its inverse value vehicle speed v
Used as H. However, in step 55, the detected value W may be used as is to determine whether or not the detected value W is equal to the upper limit value Nff1aX.

Note that the CPU 29 repeatedly executes the above routine, but the repetition period is smaller than the pulse width of the vehicle speed pulse.

Note that the timers TA and TBSTC include, for example, down counters that measure time by measuring clock pulses. Furthermore, if the program is processed at predetermined time intervals, each predetermined time period may be measured by performing a counting operation within the program.

FIG. 5 shows another example of the operation of the CPU 29.

In this operation, the vehicle speed vH is set to a predetermined speed Vl-11 (
For example, it is determined whether it is smaller than 8 km/h (step 91). If Vl-1<v, 4, then the difference AV between the vehicle speed vH read this time and the VHn-+ read when this routine was executed last time (mVH-VHn-+)
is a predetermined value ΔV+ (for example, 1, OKIll/
h/5ec) (step 92). When ΔV>Δv1, it is assumed that the vehicle has started, and the timer TA is set to a predetermined time TA to start down measurement (step 60), and a throttle valve drive command is issued to the drive circuit 28 (step 52).

When ΔV≦Δ■1, it is determined whether or not the measured value T'ru of the timer TA has reached 0 during deceleration, stopping, and cruising (step 57).

If it is TIU-0, a throttle valve drive stop command is issued to the drive circuit 28 (step 58). Other operations are similar to those shown in FIG.

In addition, in the embodiment of the present invention described above, the control circuit 2
0 is configured by a microcomputer,
The present invention is not limited to this, and may be constructed using a comparison circuit, a logic circuit, and the like.

Effects of the Invention As described above, since the idle speed control device of the present invention detects the start of the vehicle according to the vehicle speed, it can detect the start of the vehicle more accurately than a device that detects the start of the vehicle from the state of clutch operation. can do. Since the throttle valve is opened so that the idling opening of the throttle valve becomes equal to or higher than the predetermined opening until a predetermined period of time has elapsed from the time when the vehicle is started, it is possible to obtain good starting acceleration when the vehicle is started.

[Brief explanation of the drawing]

Fig. m1 is a schematic configuration diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing the configuration of the control circuit in the device of Fig. 1, and Fig.
5 through 5 are flowcharts showing the operation of the CPU. Explanation of symbols of main parts 1... Carburizer 2... Throttle valve 3... Throttle opener 4... Negative pressure supply passage 5...・Intake pipe 6... Three-way solenoid valve 20... Control circuit Figure 1 Figure 3 Figure 5 Procedure amendment memory button December 10, 1985 1, Incident display Showa fIN61 Patent Application No. 259214 2, Title of invention: Throttle valve control device for automotive internal combustion engine 3, Person making the amendment Relationship with the case: Patent applicant 4, Agent 5, Date of amendment order Voluntary action 6, Increased due to amendment Number of inventions: None 8. Contents of amendment (1) "The present invention shown in FIG. 1" in page 3, line 17 of Ming A is corrected to "FIG. 1 shows the present invention." (2) Correct "17 output levels" on page 5, line 12 of the book Il to "17 output levels." (3) Delete "alternatively" on page 6, line 11 of the specification. (4) In the 10th line of page 1 of the specification, ``Vto1 wo mitite'' is corrected to ``rVH@-read''. (5) “Predetermined opening degree θ” on page 10, lines 5 and 6 of the specification
2" is corrected to "predetermined opening degree θ1." (6) Delete "or in step 77" on page 12, line 10 of the specification. (7) [Detection value W] on page 13, line 3 to line 5
The detected value W is read in step 55 and its reciprocal value is corrected to "vehicle speed". (8) Ming 11&! On page 14, line 20, "idle rotation number m+device" is corrected to "throttle valve control device."

Claims (3)

[Claims] (1) A throttle valve control device that controls the throttle valve opening of an on-board internal combustion engine, which includes a detection means for detecting vehicle speed, and generates a throttle valve drive command when the start of the vehicle is detected based on the output of the detection means. control means for generating a command to stop driving the throttle valve after a predetermined time has elapsed from the time of detection; A throttle valve control device comprising: a drive means for driving a valve and stopping driving of the throttle valve in response to the throttle valve drive stop command. (2) The throttle valve control device according to claim 1, wherein the control means determines that the vehicle has started when the detected vehicle speed is not 0. (3) The control means determines that the vehicle has started when the detected vehicle speed is below a predetermined speed and the amount of change in vehicle speed per unit time is greater than a predetermined value. The throttle valve control device according to item 1.