JPS61261635A - Throttle valve controller - Google Patents

Abstract

PURPOSE:To improve drivability by obtaining the sensitivity of throttle valve opening-degree for the accelerating-pedal stepping-in quantity from the average value of the throttle valve opening-degree and the average value of car speed in traveling and determining the aimed value opening-degree according to the sensitivity. CONSTITUTION:The opening degree of a throttle valve A is controlled by an actuator B, and a calculating means I for calculating the average value of the car speed in traveling from the output of a car speed sensor J and a calculating means G for calculating the average value of the throttle opening-degree in traveling from the output of a throttle opening-degree sensor F are provided. Further, a calculating means H for calculating the sensitivity of the throttle valve opening-degree for the stepping-in quantity of an accelerating pedal on the basis of the both average values is provided. Further, a function generating means D which determines the relation between the accelerating pedal stepping-in quantity detected by a detecting means E and an aimed throttle valve opening-degree according to the sensitivity is provided, and the actuator B is controlled by a control means C according to the aimed throttle valve opening-degree.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a throttle valve control device that electrically controls the throttle valve of an engine according to the amount of depression of the accelerator pedal. By calculating the average value of the throttle valve opening and changing the control amount of the throttle valve opening with respect to the amount of accelerator pedal depression according to the calculated value, an appropriate throttle valve opening can be obtained. The present invention also relates to a throttle valve control device that can maintain a constant relationship between the amount of accelerator pedal depression and vehicle speed.

[Problems to be solved by conventional technology and invention]

2. Description of the Related Art Devices in which an accelerator pedal and a throttle valve are mechanically linked and the throttle valve is opened and closed according to the amount of depression of the accelerator pedal are already known. Furthermore, a device has been proposed in which the opening degree of the throttle valve is electrically controlled without using such a mechanical link. For example, the step motor used to open and close the throttle valve is controlled based on a predetermined map so that the current step position can follow the target step position of the accelerator pedal, which changes moment by moment depending on driving conditions, without losing synchronization. A throttle valve control device has been proposed that controls the opening while calculating the optimum driving frequency of the throttle valve.

However, when the load on the vehicle changes due to a change in the number of passengers or the slope of the road, or because the throttle valve opening changes even under the same driving condition, the necessary amount of accelerator pedal depression may change. Furthermore, when driving at high speeds, it is necessary to maintain a large amount of depression of the accelerator pedal, which places a burden on the driver, and further improvements are desired.

[Means for solving problems]

An object of the present invention is to provide a throttle valve control device that solves the above-mentioned problems, and its means, as shown in FIG. Means F for detecting the opening degree, Means J for detecting the running speed of the vehicle, Means I for calculating the average value of the vehicle speed during running, Means E for detecting the amount of depression of the accelerator pedal, and Means J for detecting the running speed of the vehicle; Means G for calculating an average value of the throttle valve opening, and calculating an accelerator sensitivity indicating the sensitivity of the throttle valve opening with respect to the amount of depression of the accelerator pedal based on the average value of the vehicle speed and the average value of the throttle valve. means H for determining the relationship between the amount of depression of the accelerator pedal and the target throttle valve opening according to the accelerator sensitivity; Control means C to control
The gist of the structure is to have the following. Note that the signal from the throttle opening sensor F is input to means C and G, but since it is feedback-controlled to the target throttle opening, it has the same value and can be omitted.

〔Example〕

FIG. 2 is a configuration diagram of the throttle actuator B controlled by the throttle valve control device according to the present invention, and the throttle valve A that adjusts the intake air amount of the engine includes the throttle body 1, the butterfly valve 2, and It is composed of a rotatable shaft 3 equipped with a butterfly valve 2. A gear 7 is fixed to one end of the shaft 3 and meshes with a gear 6 fixed to one end of the shaft 5 of the step motor 4.

- In such a configuration, when a drive signal is supplied to the stepper motor 4, the shaft 5 of the stepper motor 4 rotates, and the shaft 3 rotates via the gear 6.7. Therefore, the butterfly valve 2 rotates and the air passage area of the throttle body 1 changes. The gear 6.7 is a gear with a reduction ratio of 1/2, and for example, the shaft 5 of the step motor 4 is 18
When the shaft 3 rotates by 0 degrees, the shaft 3 rotates by 90 degrees.

FIG. 3 is a block diagram of the electronic control circuit 30 of the throttle valve control device and its peripheral devices according to the present invention. In FIG. 3, a one-chip microcomputer 30 used as an electronic control circuit includes a RAM 30e as a first storage means for temporarily storing calculation results and data;
A ROM 30d as a second storage means for storing programs, constants, and maps, an input/output buffer 30g for inputting and outputting signals between the computer 30 and the outside, and converting analog signals from the outside into digital signals. A/
A D converter 30f, a programmable timer 30c that counts time, and a clock 30h that generates a signal with a constant period.
It is composed of an interrupt control circuit 30b that causes the CPU 30a to perform interrupt processing when an interrupt request occurs, and a CPU 30a that performs arithmetic processing according to the program in the ROM 30d.

Clock generator 35 supplies reference clock pulses to computer 30 and serves as a reference timing signal for operation and a reference clock source for programmable timer 30c and clock 30h. Constant voltage power supply 31 stably supplies power supply voltage, for example 5V, from battery 32 to computer 30 and clock generator 35. A/D converter 30f
is the depression amount signal S from the accelerator pedal depression amount sensor E.
1 and a voltage signal S4 proportional to the vehicle speed from the vehicle speed sensor J are input. A drive signal from the computer 30 is supplied to the step motor 4 via a drive circuit 34. Voltage is applied to the step motor 4 from a battery 32 .

4(a) and (kl) are flowcharts showing the operation control procedure of the electronic control circuit shown in FIG. 3. FIG. (al
1 is the main processing routine, and 3) is the interrupt processing routine.

The main processing routine 100 is a processing routine that is constantly executed, and when an interrupt is generated by the interrupt control circuit 30b, the main processing routine is temporarily interrupted and the interrupt processing routine 200 is executed.

In the main processing routine 100, it is first determined whether 41 aa have elapsed based on the output of the clock 30h which outputs a signal every 4 cycles (step 101). If 4 ayu have not elapsed, the process waits until 4 m have elapsed.

After 4 hours have elapsed, the pedal depression signal S1 from the accelerator pedal depression sensor E is input to the A/D converter 30f and converted from an analog value to a digital value (step 102).

Next, the vehicle speed signal S4 from the vehicle speed sensor J is similarly AD converted (step 103).

Next, this vehicle speed is determined (step 104), and the vehicle speed is 2.
km/h or more, first calculate the average value of the throttle opening up to the present time, for example, for one minute (step 105).
), Next, calculate the average value of the vehicle speed up to the present time, for example, for one minute (step 106). If the vehicle speed is less than 2 km/h, processing steps 105 and 106 are not executed, and the average value of the throttle opening and vehicle speed is calculated. will not be updated. As a result, the average value only during driving is obtained.Accelerator sensitivity AC is calculated from the average value of the throttle opening and the average value of the vehicle speed to obtain the functional relationship of the throttle opening with respect to the amount of accelerator pedal depression ( Step 107). The accelerator sensitivity AC may be calculated from a desired two-dimensional map stored in the ROM 30d, or may be obtained from the following relational expression, for example. That is, AG= (kIX SPDM 2 to 10) X TAM
...(1) Here, AG is accelerator sensitivity, kl p
k2 is a constant, SPDM is the average value of vehicle speed, and TAM is the average value of throttle valve opening. .

Next, using the table shown in FIG.
A target throttle valve opening degree is calculated from the amount of depression of the accelerator pedal based on G (step 108), and the throttle actuator is controlled. The main processing routine repeatedly executes this processing.

Next, a case will be described in which the main processing routine 100 is temporarily interrupted and the interrupt processing routine 200 is executed. When an interrupt processing request S2 is issued from the interrupt control circuit 30b shown in FIG. 3 to the CPU 30a, the CPU 30a temporarily interrupts the main processing routine 100 and proceeds to the interrupt processing routine 200. In this case, the interrupt processing request S2 is generated when the count overflow signal S3 from the programmable timer 30c is input to the interrupt control circuit 30b. Here, the programmable timer 30c uses an 8-bit center pull amplifier counter, and uses 6p! as a count clock. It continues to count up at 1, and when the value exceeds 8 bits, that is, 256, an overflow signal S3 is generated.

In the interrupt processing routine 200, first, the rotation direction is determined from the current throttle opening, the target throttle opening, and the current rotational speed, and a signal is sent from the input/output cover sofa 30g to rotate the step motor 4 one step forward, reverse, or stop. Output to the drive circuit 34 (step 201)
Next, the time at which the step motor 4 is to be rotated next is calculated from the current rotation speed, the timer 30c is set so that the next interrupt will occur at that time (step 202), and the process returns to the main processing routine ( Step 203), where the relationship between the throttle opening and the number of steps is 0 steps and the throttle valve opening is 0 degrees (fully closed').
, the opening degree is 81 degrees (fully open) in 360 steps, and the current throttle valve opening degree is calculated by counting the number of operation steps. Further, the rotation speed is calculated as the reciprocal of the time from the set value of the timer 30c until the timer overflow occurs. In this interrupt processing routine 200, the rotation of the step motor 4 is controlled so that the throttle valve opening becomes the target throttle valve opening.

FIG. 5 shows a table for determining the target throttle valve opening degree from the accelerator pedal depression amount based on the accelerator sensitivity AG. From the relationship in Figure 5 and equation (1), when the average vehicle speed is high or when the average throttle opening is large, the accelerator sensitivity AC increases, and the throttle valve is controlled to open wide for the same amount of accelerator pedal depression. In the opposite case, the accelerator sensitivity becomes smaller and the throttle valve is controlled to open smaller for the same accelerator pedal depression amount.

〔Effect of the invention〕

According to the present invention, since the throttle valve opening degree relative to the accelerator pedal depression amount is updated in accordance with changes in vehicle driving conditions, the average accelerator pedal depression amount does not change much, improving drivability and improving driver comfort. The burden of this will be reduced. For example, for people who drive carefully, the opening degree of the throttle valve will be smaller in relation to the amount of accelerator pedal depression, allowing smoother driving; Since the opening degree of the throttle valve increases relative to the engine speed, more responsive operation becomes possible.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a throttle valve control device according to the present invention, FIG. 2 is a configuration diagram of a throttle actuator, FIG. 3 is a configuration diagram of an electronic control circuit and its peripheral devices used in the device shown in FIG. 1, and FIG. 4 (a) and (b) are control flowcharts of the apparatus in FIGS. 1 and 2, and FIG. 5 is an embodiment of a control table used in the present invention. (Explanation of symbols) A... Throttle valve, B... Throttle actuator, C... Control means, D... Function generation means, E... Accelerator pedal depression amount detection means, F... Throttle. Valve opening sensor, G... Throttle valve opening averaging means, H... Accelerator sensitivity calculation means, ■... Vehicle speed averaging means, J... Vehicle speed sensor, 4... Step motor, 30 ...Electronic control circuit, 30a-CPU. 30b...Interrupt control circuit, 30c...Programmable timer, 30d...ROM. 1'30e-RAM. 30f... A/D converter, 30g... Input/output cover sofa, 30h... Clock, 31... Constant voltage power supply, 32... Battery, 34... Drive circuit, 35... Clock generator . Fig. 1 is a configuration diagram of a throttle valve control device of the present invention. Fig. 2 is a configuration diagram of a throttle actuator. 1... Throttle body 2... Butterfly valve 3... Shaft 4... Step motor 5... Shaft 6・・・
・Gear 7...Gear electronic control circuit and peripheral device configuration diagram Figure 3 (o) Control flow chart Figure 4 Diagram showing control table Figure 5

Claims (1)

[Claims] 1. A throttle actuator that rotates a throttle valve in response to an electric signal, a means for detecting the opening degree of the throttle valve, a means for detecting the traveling speed of the vehicle, a means for calculating the average value of the vehicle speed during traveling, and an accelerator pedal. means for detecting the amount of depression of the accelerator pedal; means for calculating the average value of the opening degree of the throttle valve during driving; and means for detecting the amount of depression of the accelerator pedal based on the average value of the vehicle speed and the average value of the throttle valve means for calculating an accelerator sensitivity indicating the sensitivity of a valve opening; a function generating means for determining a relationship between the amount of depression of the accelerator pedal and a target throttle valve opening according to the accelerator sensitivity; and control means for controlling the actuator so that the actuator is equal to the value.