JPH0756238B2 - Engine load information supply device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a load information supply device for an engine, which is mounted on an engine whose intake passage is provided with a bypass passage.

(Prior Art) Conventionally, an electric signal output from a throttle position sensor is used for engine speed control and shift control of an automatic transmission (hereinafter simply referred to as A / T). Among these, in ISC control such as idle speed control, fast idle control, or dashpot control, throttle valve opening information is particularly required for accuracy in the area where the throttle valve opening is small, and the DC motor controls the throttle valve opening information. The throttle valve opening information is adjusted and the motor position sensor obtains throttle valve opening information with high accuracy.

On the other hand, it has been proposed that the intake passage is a composite passage of a main passage and a bypass passage. An engine equipped with this type of intake passage can control the flow rate in the bypass passage by using, for example, an air valve for fast idle control or a bypass air valve with a step motor, and in particular, the control gain is reduced to improve the resolution. It is possible to carry out ISC control while holding it.

(Problems to be Solved by the Invention) However, in the compound road system, the following problems occur when the load information is obtained from the throttle position sensor.

For example, the A / T electronic control unit selects a shift pattern from load information (throttle opening) and engine speed,
The gear position is selected from this, and the hydraulic control unit in the A / T is switched.

In this case, in order to perform a smooth shift-up at the time of power-on when the engine is accelerating, it is desirable that the clutch as a hydraulic pressure switching element should quickly grasp the engine side and ride on the increase in its speed. In order to perform a smooth shift-up at the time of power off, it is desirable that the clutch waits for a decrease in rotation on the engine side and then slowly grasps the engine side.

However, even when the throttle valve is fully closed when the power is turned off, the bypass passage may be open.Especially when the fast idle air valve is in the open operation, the engine side may change the rotational speed rather than the clutch off. It raises a fixed amount. If the clutch grabs the engine side in this state, a large switching shock will be received.

When an A / T is installed in combination with an engine equipped with an intake passage with a bypass in addition to an ISC device in this way, the throttle opening used as a load for A / T control is the accurate air amount A of the engine. The load based on the throttle opening at this time does not include the load equivalent to the intake air amount of the bypass passage of the ISC device, which causes a problem in A / T shift control. There is.

Note that there is one that controls the A / T by using boost information as load information instead of throttle opening information, but in the case of only boost information, it is difficult to determine the kickdown request from only boost, so a separate kickdown A throttle opening detection switch is required.

An object of the present invention is to output load information of an engine having a composite intake passage having a bypass passage as accurate load information reflecting the intake air amount of the bypass passage, and also to output load information with good responsiveness. It is to provide the load information supply device.

(Means for Solving Problems) In order to achieve the above-mentioned object, a first invention is a control device for controlling the opening information of a throttle valve provided in an intake passage of an engine as the load information of the engine. In a load information supply device for a vehicle engine of a vehicle equipped with the engine, an intake path of the engine formed by a main path in which a throttle valve is installed and a bypass path provided in parallel with the main path; The intake information detecting means for directly detecting the intake information of the engine, the engine circuit sensor for detecting the number of circuits of the engine, and the intake passage are assumed to be a single intake passage provided with a throttle valve. The throttle valve opening information of the single intake passage that can obtain the same intake information as the intake information detected by the intake information detected by the intake information detecting means. It has a machining load information calculating means for calculating using the information and the engine speed detected by the engine speed sensor and outputting as load information to the control device.

In the load information supply device for an engine according to claim 1, the intake information detecting means is a boost sensor for detecting a boost pressure in the intake passage.

In the engine load information supply device according to claim 1, the intake information detecting means is an air flow sensor for detecting the amount of air passing through the intake passage.

The engine load information supply device according to claim 1, wherein the intake information detecting means is an air flow sensor for detecting the amount of air passing through the intake passage, and the processing load information calculating means is the air flow sensor. The intake air amount per intake stroke is obtained based on the air amount detected by, and the throttle valve opening of the single intake passage is calculated using the intake air amount per intake stroke and the engine speed detected by the engine rotation sensor. It is characterized by computing information.

The engine load information supply device according to claim 1, further comprising a throttle sensor for detecting a throttle opening of a throttle valve on the main road, and the processing load information calculating means is detected by the throttle sensor. The throttle valve opening information of the single intake passage is corrected based on the throttle opening.

A second aspect of the present invention is an engine load information supply device for a vehicle engine equipped with a control device that controls opening degree information of a throttle valve provided in an intake passage of the engine as load information for the engine. An intake path of an engine formed by a main path in which a throttle valve is provided and a bypass path provided in parallel with the main path; and a throttle sensor for detecting the throttle opening of the throttle valve in the main path,
Assuming that the bypass passage opening sensor for detecting the opening of the bypass passage and the intake passage as a single intake passage provided with a throttle, the throttle opening information of the single intake passage,
A machining load information calculating means for calculating using the opening degree of the bypass passage detected by the throttle sensor and outputting it as load information to the control device.

(Operation) In the first aspect of the invention, the intake passage, which is a composite passage including the main passage in which the throttle valve is arranged and the bypass passage arranged in parallel with the main passage, is used as a single intake passage in which the throttle valve is arranged. Assuming that, the machining load information calculating means is detected by the intake information detecting means using the intake information detected by the intake information detecting means and the engine speed detected by the engine speed sensor. The throttle valve opening information of the single intake passage that can obtain the same intake information as the intake information can be output to the control device as load information.

In this case, in particular, the boost pressure in the intake passage may be detected by the boost sensor.

In this case, the amount of air passing through the intake passage may be detected by the air flow sensor.

In this case, in particular, the air flow sensor detects the amount of air passing through the intake passage, and the processing load information calculating means obtains the amount of intake air per intake stroke based on the amount of air detected by the air flow sensor. The throttle valve opening information of the single intake passage may be calculated using the amount and the engine speed.

In this case, in particular, the throttle opening of the main throttle valve is detected by the throttle sensor, and the processing load information calculating means determines the throttle valve opening information of the single intake passage based on the throttle opening detected by the throttle sensor. May be corrected.

In the second aspect of the invention, it is assumed that the intake passage, which is a composite passage including the main passage in which the throttle valve is arranged and the bypass passage arranged in parallel with the main passage, is a single intake passage in which the throttle valve is arranged. Then, using the throttle opening information of the single intake passage, the throttle opening of the throttle valve of the main passage detected by the throttle sensor and the opening of the bypass passage detected by the bypass passage opening sensor are used. And calculate
The throttle valve opening information of this single intake passage can be output to the control device as load information.

(Embodiment) FIG. 2 shows a load information supply device for the engine E. A part of the intake passage 10 of the engine E is formed as a composite passage including a main passage 12 provided with a throttle valve 11 and a bypass passage 13 arranged in parallel with the main passage 12, and an electromagnetic fuel injection valve is provided on the upstream side thereof. 14, the air flow sensor 15, and the air cleaner 16 are arranged in this order.

The shaft 111 of the throttle valve 11 is connected to a throttle lever (not shown) outside the intake passage, and this is connected to an accelerator pedal (not shown) via a link. The throttle valve 11 is provided with an idle switch 18 which is turned on when the throttle valve 11 is fully closed. A throttle potentiometer (hereinafter simply referred to as a throttle sensor) 19 that generates a voltage proportional to the opening of the throttle valve 11 (throttle opening) is provided on the shaft 111.
Is installed.

The bypass passage 13 operates as an ISC control actuator by changing the opening area of the bypass air valve 20 and the bypass air valve 21 which are arranged in parallel. The first idle air valve 20 is provided with a return spring (not shown) that exerts a pressing force in the opening direction and a wax type temperature sensing unit 23 that exerts a pressing force in the valve closing direction as the cooling water temperature rises. Only fast idle control is performed to increase the number of revolutions.

The bypass air valve 21 includes a step motor 24 and a return spring 25.
And is operated from the fully closed position of the home position by an amount according to an output signal from the controller 40 described later. The bypass valve opening θ _B of the bypass air valve 21 may be detected by the bypass potentiometer sensor 26,
Alternatively, the opening degree can be detected from the step signal (pulse wave) stored in the controller 40. Further, if necessary (when added to the calculation of the bypass opening area A _B pv described later), the opening degree of the fast idle air valve 20 may be detected by the fast idle potentiometer sensor 27.

Further, an engine speed sensor 29 for detecting the engine speed from, for example, ignition pulse information obtained from the primary minus terminal of the ignition coil 28 is provided, and the intake passage is provided.
A boost sensor 31 that emits an electric signal according to the pressure value of the intake manifold 30 of 10 is provided.

The air flow sensor 15 detects the number of Karman vortices generated by the columnar bodies arranged in the intake passage 10 by ultrasonic modulation means or by detecting a change in resistance value, so that the intake air in the intake passage 10 is detected. The amount A is detected, and the digital output from the air flow sensor 15 is input into the controller 40.

Further, digital signals from the engine rotation sensor 29, the air flow sensor 15, etc. are output to the input / output interface 32 in the controller 40, and the central processing unit (CP
U) It is taken in by 33. Further, detection signals from the throttle sensor 19, bypass potentiometer sensor 26, fast idle potentiometer sensor 27, boost sensor 31, etc. are digitized and input to the controller 40.

By the way, the controller 40 includes a CPU 33, a read only memory (ROM) 35, a random access memory (RAM) 36, a microcomputer including input / output interfaces 32 and 37, an A / D converter 34 for digitizing analog signals,
It has a D / A converter 38 for converting a digital signal into an analog signal.

The controller 40 has a function as well-known ISC control means and other engine control means, and particularly has a function as machining load information calculation means here. First
As shown in the figure, the processing load information calculation means assumes the intake passage formed by the main passage in which the throttle valve is arranged and the bypass passage as a single intake passage in which the throttle valve is arranged, and detects the intake information. The throttle valve opening information of the single intake passage that can obtain the same intake information as the intake information detected by the means, the intake information detected by the intake information detecting means and the engine speed detected by the engine rotation sensor. Is calculated and is output to the control device as load information.

That is, a processing load information supply routine, which will be described later, is executed as the processing load information calculating means. At this time, first, the intake air amount A / N per intake stroke as the load information directly obtained from the engine E and the processing load information θ _O based on the engine speed N are calculated, and this is calculated via the D / A converter 38. A known automatic transmission (A / T) 42 as a controlled device (for example, disclosed in Japanese Patent Application No. 56-154266).
To an electronic control unit (hereinafter referred to as A / T controller) 41 of.

It should be noted that the A / T 42 automatically achieves a shift speed suitable for the load state of the vehicle. That is, the processing load information θ _O as the load information and other vehicle operation information, for example, the rotation speed information of each part of the power transmission system such as the engine rotation speed, etc.
Based on this, one of a plurality of built-in shift maps (shown in FIGS. 3 (a), (b), (c), and (d) as an example of its characteristics) is selected, and then power-on (acceleration) is performed. ) Or power off (deceleration), select the optimum shift speed from this, and output a shift signal according to the switching shift speed to the hydraulic control device 43.
It is applied to a solenoid valve (not shown) therein to adjust the hydraulic pressure to achieve a smooth gear shift operation and to switch the oil passages to shift gears.

By the way, CPU33 in the controller uses RAM36 and ROM3
Although it operates according to the program in 5, the machining load information supply routine is shown in FIG.

The trigger of this routine may be issued in synchronization with the engine rotation (for example, every ignition timing). Other,
A time interruption or the like may be performed. First, in step a1, various data (air amount A, actual throttle opening θ _R , engine speed N, etc.) are obtained from the air flow sensor 15 and the throttle sensor.
19, read from the engine rotation sensor 29, etc. It should be noted that this data reading may be performed by another routine and stored in the RAM 36.

Next, at step a2, the intake air amount A / N per intake stroke is calculated from the air amount A and the engine speed N that have just been read. At this time, the air flow sensor 15 is actually measuring the air amount A of the composite path including the main path 12 and the bypass path 13, and the intake air quantity A / N per intake stroke here also reflects the flow rate of the bypass path 13. Value. At step a3, the approximate throttle opening θ _E corresponding to this A / N value and the engine speed N is obtained from the ROM 35. This estimated throttle opening θ _E represents the throttle valve opening information of the single intake passage on the assumption that the composite passage including the main passage 12 and the bypass passage 13 is the single intake passage. In the ROM 35, an approximate throttle opening map is created and stored by actually measuring in advance how the relationship between A / N and the approximate throttle opening θ _E is when the engine speed N is used as a parameter. However, this can be shown by the characteristic diagram as shown in FIG.

Next, in step a4, it is determined whether or not the estimated throttle opening is equal to or larger than the actual throttle opening θ _R extracted from the RAM 36. If YES, the processing proceeds to step a5, and if NO, the processing proceeds to step a6. In step a5, the estimated throttle opening θ _{E is set} to the processing load information θ _R
Is the processing load information θ _O, and proceed to step a7 for A
Output machining load information θ _O to the / T controller, and then
Return to the main routine of the controller.

By executing steps a4, a5, and a6 in this way, the controller 40 causes the bypass road 13 to operate in the low-load operation range in which the estimated throttle opening θ _E exceeds the actual throttle opening θ _R.
It is possible to improve the reliability by outputting the estimated throttle opening θ _E , which also reflects the flow rate, to the controlled device as the processing load information θ _O. On the other hand, in the operating region on the high load side where the actual throttle opening θ _R exceeds the estimated throttle opening θ _E , the controller 40 does not need to consider the influence of the flow rate of the bypass path 13 and rather has a highly responsive actual throttle opening. Degree θ _R Processing load information θ _O
As a result, the reliability can be further improved by outputting to the controlled device.

It should be noted that, when the throttle valve is close to full opening, the A / N (the same applies to the boost P and the air amount A) hardly changes as shown in FIG. 5, and the accuracy of the estimated throttle opening θ _E tends to decrease in this region. For this reason, in this region, the map processing is performed with the approximate throttle opening θ _E being a value that is somewhat suppressed, and the larger one of this and the actual throttle opening θ _R is selected. As a result, when reaching the region R1 (high-load side operating region) near full opening, the actual throttle opening θ _R exceeds the estimated throttle opening θ _E , and at this time, the influence of the flow rate of the bypass 13 almost disappears. Therefore, the actual throttle opening θ _R , which is rather responsive, can be selected as the processing load information θ _O , and continuity with the other region R2, which is the operating region on the low load side, can be secured. Moreover, it is possible to prevent kickdown from occurring on the low opening side due to the large deviation of the estimated throttle opening θ _E.

Although the A / N value is calculated in the processing load information supply routine shown in FIG. 4 in the above-described processing, the boost P may be read from the boost sensor 31 or the air amount A may be read from the air flow sensor 15 instead. . in this case,
How about the relationship between boost P with engine speed N as a parameter and estimated throttle opening θ _E (see FIG. 6) or the relationship between air amount A and estimated throttle opening θ _E (see FIG. 7)? Each approximate throttle opening map is created by actually measuring whether there is any, and the comparison processing of each approximate throttle opening θ _E and actual throttle opening θ _R is the same, calculated using these maps. The processing load information θ _O may be obtained respectively. Further, in some cases, comparison with the actual throttle opening θ _R may be omitted, and the approximate throttle opening θ _E may be regarded as the processing load information θ _O. In this case, the loss time in calculation can be shortened.

Further, a processing load information supply routine as shown in FIG. 8 may be adopted. Also in this case, the trigger of this routine is performed in the same manner as described with reference to FIG. Then, in step b1, each data of the actual throttle opening θ _R and the bypass valve opening θ _B is read from the throttle sensor 19, the bypass potentiometer sensor 26 and the like.

Then using the actual throttle opening theta _R read now in step b2, to processing the throttle opening area A _TH based on the pre-throttle opening area calculation formula built in _{ROM35 A TH = f (θ R} ). Similarly, in step b3, the bypass valve opening θ _B is used to calculate the bypass opening area A _B pv based on the bypass opening area calculation formula A _B pv = f (θ _B ) built in the ROM 35.

Further, in step b4, the total opening area _{AT, that} is, the area value corresponding to the opening area when the intake passage 10 is a single passage, is obtained by adding both opening areas A _TH and A _B pv.

After that, in step b5, the machining load information θ _O corresponding to the total opening area A _T is calculated from the calculation formula θ _O = f (A _T ) incorporated in the ROM 35, and in step 6, the A / T controller 41 is processed with the machining load information. Outputs θ _O and returns to the main routine.

In addition, instead of each calculation formula adopted in steps b2, b3, b5,
A map that satisfies each relationship is built in ROM35,
It can also be configured to read the desired value by table lookup.

Although the controlled device has been described as the A / T 42 in the above-mentioned processing, other devices, for example, the torque is calculated from the throttle opening (processing load information) and the engine speed, and the torque value is displayed on the instrument panel by the display means. It may be output to the torque meter that is displayed on.

(Effect of the Invention) A first invention is a load information supply device for an engine of a vehicle equipped with a control device for controlling an opening of a throttle valve provided in an intake passage of the engine as load information of the engine. Even if the intake passage is formed by the main passage in which the throttle valve is arranged and the bypass passage arranged in parallel with the main passage, the throttle of the single intake passage is based on the intake information and the engine speed. The valve opening information can be output to the control device as load information, and the control device can perform control based on accurate load information in consideration of the amount of air supplied to the engine through the bypass passage.

According to a second aspect of the present invention, in a load information supply device for an engine of a vehicle equipped with a control device that controls an opening of a throttle valve provided in an intake passage of the engine as load information of the engine, the intake passage of the engine is Even if it is formed by a main path in which the throttle valve is arranged and a bypass path arranged in parallel with this main path, the throttle opening of the throttle valve in the main path and the opening degree of the bypass path are used alone. (1) Obtain the throttle valve opening information of the intake passage and output it as load information to the control device, and the control device should perform control based on accurate load information considering the amount of air supplied to the engine through the bypass passage. It has the effect that In addition, both the first and second inventions have the advantage that the control device side can use the circuits and logic as in the conventional case, and the matching method and the labor thereof are almost the same.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention, FIG. 2 is a schematic device of an engine load information supply device as one embodiment of the present invention, and FIGS. 3 (a), (b), (c), (D) is a characteristic curve diagram for explaining the same device, FIGS. 4 and 8 are flowcharts of different machining load information supply routines performed by the same device, and FIGS. 5, 6, and 7 are the same. The characteristic curve figure for demonstrating an apparatus is each shown. 10 …… intake path, 11 …… throttle valve, 12 …… main path, 13…
… Bypass, 15 …… Air flow sensor, 19 …… Throttle sensor, 26 …… Bypass potentiometer, 27…
… Potentiometer for fast idle, 29 …… Engine rotation sensor, 31 …… Boost sensor, 40 …… Controller, 42 …… A / T, E …… Engine.

Claims (6)

[Claims] 1. An engine load information supply device for a vehicle engine equipped with a control device that controls opening information of a throttle valve provided in an intake passage of the engine as load information of the engine. The intake path of the engine formed by the main path in which the valve is installed and the bypass path provided in parallel with the main path, the intake information detecting means for directly detecting the intake information of the engine, and the rotational speed of the engine Assuming that the engine rotation sensor for detection and the intake passage are a single intake passage provided with a throttle valve, the same intake information as the intake information detected by the intake information detecting means can be obtained. The throttle valve opening information of the road is used as the intake information detected by the intake information detecting means and the engine rotation detected by the engine rotation sensor. DOO load information supply device for an engine having a processing load information computing means for outputting to the control device as a calculated load information with. 2. The load information supply device for an engine according to claim 1, wherein the intake information detecting means is a boost sensor for detecting a boost pressure in the intake passage. 3. The load information supply device for an engine according to claim 1, wherein the intake information detecting means is an air flow sensor for detecting the amount of air passing through the intake passage. 4. The intake information detecting means is an air flow sensor for detecting the amount of air passing through the intake passage, and the processing load information calculating means is based on the amount of air detected by the air flow sensor. A throttle valve opening information of the single intake passage is calculated by obtaining an intake air amount and using the intake air amount per intake stroke and the engine speed detected by the engine rotation sensor. A load information supply device for an engine according to claim 1. 5. A throttle sensor for detecting the throttle opening of the throttle valve of the main passage, wherein the processing load information calculating means is based on the throttle opening detected by the throttle sensor, and the throttle of the single intake passage. The engine load information supply device according to claim 1, 2 or 3 or 4, wherein valve opening information is corrected. 6. A vehicle engine load information supply device for a vehicle engine equipped with a control device for controlling opening degree information of a throttle valve provided in an intake passage of the engine as load information of the engine. An intake path of the engine formed by a main path in which the valve is arranged and a bypass path provided in parallel with the main path, a throttle sensor for detecting a throttle opening of a throttle valve on the main path, and a bypass path of the bypass path. Assuming that the bypass passage opening sensor for detecting the opening and the intake passage are a single intake passage provided with a throttle, the throttle opening information of the single intake passage is
Machining using the throttle opening of the throttle valve of the main road detected by the throttle sensor and the opening of the bypass passage detected by the bypass passage opening sensor, and outputting it as load information to the control device An engine load information supply device having a load information calculation means.