JPH09317549A - Device for processing detection value of throttle sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a throttle opening of high accuracy by setting the completely closed reference value of a throttle sensor based on a plurality of detected values of the throttle sensor when the throttle opening is estimated to be completely closed and by correcting the detected values from the throttle sensor with the completely closed reference value. SOLUTION: A throttle opening detecting signal from a throttle sensor is read and memorized (s1) and, if it is judged that the throttle opening detecting signal of voltage is within a prescribed range that the throttle is judged to be completely closed and the variations in voltage is constant (s2), it is judged whether a prescribed time elapses after an engine speed becomes a specified value (s3) or not. It is judged whether the engine speed is not more than a prescribed value (s4) and, when the answer is YES, it is judged whether each wheel speed sensor is zero or not (s5) and, when it is zero, the throttle detection signal of the memory is read out and the mean value thereof is calculated and is updated and stored in the memory as a completely closed reference value and the throttle sensor opening detecting signal of the throttle sensor is put into an offset processing with the completely closed reference value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection value processing device for a throttle sensor, which detects a throttle opening based on a detection value corresponding to a throttle opening from a throttle sensor.

[0002]

2. Description of the Related Art The output of a throttle sensor when the throttle opening is fully closed varies depending on the sensor. This is due to variations inherent in the sensor circuit, variations in the mounting position, and the like. On the other hand, in order to obtain the absolute value of the throttle opening from the fully closed position, it is necessary to absorb these variations. To achieve this,
For example, in an engine control device, an automatic transmission control device, or the like, the output when the throttle opening is fully closed is learned and held, and the absolute value of the throttle opening is calculated on the basis of this output. By doing so, variations are absorbed.

As a method of learning the output when the throttle opening is in the fully closed state, for example, a contact type idle switch is provided to detect the fully closed state of the throttle opening, and the output at this point is fully output. A method of holding the output as a closed state is known.

[0004]

However, in the conventional method for detecting the fully closed state of the throttle opening, the hardware idle switch is used to detect that the throttle opening is in the fully closed state. Therefore, if the idle switch fails, the fully closed state cannot be detected, and the output when the throttle opening is fully closed cannot be learned. Also,
There is a problem that it is difficult to adjust the position of the idle switch at the time of initial setting or repair, and it takes a long time to adjust the position.

Even when the idle switch is on, the output value of the throttle sensor fluctuates,
Since the output value has a range, there is a problem that an appropriate output value cannot be obtained as the output of the throttle sensor in the fully closed state.

Therefore, the present invention has been made by paying attention to the above-mentioned unsolved problems of the prior art, and accurately detects the output when the throttle opening is in the fully closed state, and provides a highly accurate throttle opening. It is an object of the present invention to provide a detection value processing device of a throttle sensor that can obtain the above.

[0007]

In order to achieve the above object, a detection value processing device for a throttle sensor according to a first aspect of the present invention determines a throttle opening degree based on a detection value corresponding to the throttle opening degree from the throttle sensor. In the detection value processing device of the throttle sensor configured to detect, based on a plurality of detection values of the throttle sensor in a state where the throttle opening is estimated to be fully closed, the throttle opening is fully closed. A fully closed reference value that is the detection value at a certain time is set, and from the value obtained by offsetting the detection value of the throttle sensor by the fully closed reference value and the ratio of the change in the throttle opening with respect to the change in the preset detection value. It is characterized in that the throttle opening is calculated.

According to the first aspect of the present invention, based on a plurality of detected values from the throttle sensor when the throttle opening is estimated to be in the fully closed state, for example, the average value of the plurality of detected values is used to open the throttle. Is set to a fully closed reference value which is a detection value of the throttle sensor when the degree is fully closed. Then, the detected value of the input throttle sensor is
The throttle opening is calculated from a value offset by the set fully closed reference value and the ratio of the change in the throttle opening to the change in the preset detection value.

According to a second aspect of the present invention, there is provided a throttle sensor detection value processing device for detecting a throttle opening degree based on a detection value corresponding to the throttle opening degree from the throttle sensor. In a fully closed state detecting means for detecting that the throttle opening is in a fully closed state, and a plurality of throttle sensors from the throttle sensor in a state in which the fully closed state detecting means detects the fully closed state. Reference value setting means for setting a fully closed reference value, which is the detected value when the throttle opening is in the fully closed state, based on the detected value, and the detection value of the throttle sensor is offset by the fully closed reference value. A throttle opening calculation means for calculating the throttle opening from a predetermined value and a change rate of the throttle opening with respect to a preset detection value. It is characterized in Rukoto.

According to the second aspect of the present invention, when the fully closed state detecting means detects that the throttle opening is in the fully closed state, a plurality of throttle sensors from the throttle sensor when the throttle opening is in the fully closed state are detected. Based on the detected value, for example, an average value of a plurality of detected values, etc., the fully closed reference value which is the detected value of the throttle sensor when the throttle opening is in the fully closed state is set by the reference value setting means. Then, based on the value obtained by offsetting the detected value of the throttle sensor by the fully closed reference value, and the ratio of the change of the throttle opening with respect to the preset detection value of the throttle sensor, the throttle opening calculation means, The throttle opening degree is calculated according to the input detection value of the throttle sensor.

Further, in the throttle sensor detection value processing device according to a third aspect of the present invention, the fully closed reference value setting means includes a reference value holding means capable of holding the fully closed reference value even after power-off. I am trying.

According to the third aspect of the present invention, the fully closed reference value set by the fully closed reference value setting means is held in the reference value holding means even after the power of the detection value processing device is cut off. When the throttle is closed, the throttle opening is calculated based on the held fully closed reference value.

[0013]

According to the detection value processing device of the throttle sensor according to the first aspect of the present invention, based on a plurality of detection values of the throttle sensor when the throttle opening is estimated to be in the fully closed state. The throttle sensor's detected value is set because the throttle sensor's fully closed reference value is set, and the detected value from the throttle sensor is corrected based on the fully closed reference value, and the throttle opening is detected based on this. It is possible to easily set the fully closed reference value based on the above, and because the fully closed reference value is set based on multiple detected values, it is possible to set an accurate fully closed reference value, and throttle with high accuracy. The opening can be detected.

Further, according to the detection value processing device of the throttle sensor of the second aspect, when the fully closed state detecting means detects that the throttle opening is in the fully closed state, the throttle opening is in the fully closed state. Set the fully closed reference value based on the multiple detected values from the throttle sensor when, and correct the input value of the throttle sensor that is input based on this fully closed reference value. Since the detection is performed, the fully closed reference value can be easily detected based on the detection value of the throttle sensor, and the fully closed reference value is obtained based on a plurality of detection values. The fully closed reference value can be set, and the throttle opening can be detected with higher accuracy.

Further, according to the detection value processing device of the throttle sensor of the third aspect, the reference value holding means holds the fully closed reference value set by the fully closed reference value setting means even after the power is cut off. Therefore, when the power is turned on, the fully closed reference value detected at the previous startup is retained, and even if the fully closed state detection means does not detect that the throttle opening is in the fully closed state, the fully closed reference value that was retained is retained. The throttle opening can be detected with high accuracy by calculating the throttle opening based on the value.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, a case where the detection value processing device for a throttle sensor according to the present invention is applied to a driving force distribution control device for a four-wheel drive vehicle based on an FR (front engine / rear drive) system will be described.

In FIG. 1, reference numeral 1 is a rotary drive source, that is, an engine as an engine, 2FL to 2RR are front left wheels to
The rear right wheel 3 is a driving force distribution system that can change and control the driving force distribution ratio to the wheels 2FL to 2RR, and 4 is a driving force distribution control device that controls the driving force distribution by the driving force transmission system 3.

The driving force transmission system 3 is provided with a clutch (not shown) for connecting and disconnecting the driving force from the engine 1, a transmission 12 for shifting the output of the clutch at a selected gear ratio, and a driving force from the transmission 12. Of the front wheels 2FL and 2FR and rear wheels (normal drive wheels) 2RL and 2RR. And in the driving force transmission system 3,
The front wheel side driving force divided by the transfer 14 is transmitted via the front wheel side output shaft 16, the front differential gear 18 and the front wheel side drive shaft 20 to the front wheels 2FL,
It is transmitted to 2FR. On the other hand, the rear wheel side driving force is transmitted to the rear wheels 2RL, 2RR via a propeller shaft (rear wheel side output shaft) 22, a rear differential gear 24, and a rear wheel side drive shaft 26.

As shown in FIG. 2, the transfer 14 has an input shaft 30 inserted in a transfer case 28.
The left end of the figure is connected to the output side of the transmission 12, and the input shaft 30 is rotatably supported by a bearing 31 or the like. A right end portion of the input shaft 30 in FIG. 2 is connected to an output shaft 33 rotatably supported by a bearing 32, and the output shaft 33 is connected to the propeller shaft 22. The detailed structure of this transfer and a transfer clutch to be described later is described in, for example, Japanese Unexamined Patent Publication No.
See 204826.

On the other hand, at the center of the input shaft 30, there is provided a fluid type multi-plate clutch mechanism 37 as a variable torque clutch capable of changing the torque distribution ratio to the front and rear wheels. The clutch mechanism 37 includes a clutch drum 37a splined to the input shaft 30, a friction plate 37b rotationally engaged with the clutch drum 37a, and a needle bearing or the like on the outer peripheral portion of the input shaft 30. Clutch hub 37c rotatably supported
FIG. 2 of the friction mechanism 37d engaged with the clutch hub 37c in the rotational direction and the clutch mechanism 37
A clutch piston 37e arranged on the right side of
A cylinder chamber 37f formed between the clutch piston 37e and the clutch drum 37a is provided. Further, in the clutch mechanism 37, 37h is a return spring for the clutch piston plate 37e. The clutch mechanism 37 is also connected to the front wheel side via a gear train mounted on the left end side in FIG. 2 as illustrated. That is, the clutch hub 3
7c is spline-coupled to the first gear 41a, the first gear 41a is meshed with the rotatable second gear 41b by the bearings 40a, 40b, and the second gear 41b is the bearings 42, 43. Via the third gear 41c rotatable by the front wheel side output shaft 16 described above.
It is connected to.

At a predetermined position on the side surface of the transfer case 28, there is formed an input port to which an operating oil pressure from a pressure control valve 50 forming a part of a clutch control device described later is supplied as a command force. The working hydraulic pressure is supplied from the input port to the cylinder chamber 37f.

Therefore, in a state in which the operating oil pressure is not supplied to the input port, that is, in a state in which the pressure in the cylinder chamber 37f of the clutch mechanism 37 is atmospheric pressure or substantially equal to atmospheric pressure, the elastic force of the return spring 37h causes
The friction plate 37b and the friction disc 37d are separated from each other. Therefore, in this state, all of the input torque transmitted to the input shaft 30 is transmitted to the rear wheel side via the output shaft 33 and the propeller shaft 22, and only the rear wheel side is in the two-wheel drive state. On the other hand, when the operating oil pressure is supplied to the input port, the clutch piston 37
A pressing force is generated by e, and a fastening force due to a frictional force is generated between the friction plate 37b and the friction disc 37d, so that part of the front drive torque is transmitted via the output shaft 16 to the front wheel. It is also transmitted to the side. The transmission torque ΔT to the front wheel side is determined by the supply hydraulic pressure P
Is given by the following equation (1) and linearly increases with respect to the supply hydraulic pressure P.

ΔT = P · S · 2n · μ · r _m (1) where S is the pressure acting area of the piston 37e, n is the number of friction discs, μ is the friction coefficient of the clutch plate, and r
_m is the effective radius of torque transmission of the friction disc.

That is, the transmission torque ΔT to the front wheel side is proportional to the supply oil pressure P, and eventually the driving torque is distributed and transmitted to the rear wheel side and the front wheel side according to the engagement force. The torque distribution ratio to the front and rear wheels can be continuously changed (from 0: 100 to 50:50) according to the pressure P of the hydraulic oil supplied to the input port.

On the other hand, returning to FIG. 1, the driving force distribution control device 4 includes the transfer 14 and the reservoir 3.
A fluid pressure source 35 for pressurizing and supplying the hydraulic oil in 5b, and a pressure control valve for variably controlling the hydraulic pressure supplied from the fluid pressure source 35 to supply the hydraulic oil to the input port of the fluid type multi-plate clutch mechanism 37. 50, a controller 60 that controls the output hydraulic pressure of the pressure control valve 50 based on detection signals from various sensors that are input, and a controller 60 that supplies the detection signals to the controller 60. A vehicle speed sensor 51 for detecting a vehicle speed, front left and right wheel speed sensors 52FL and 52FR provided for each wheel, rear left and right wheel rotation sensors 52RL and 52RR, and a throttle opening detection signal θ from a not-illustrated accelerator pedal depression amount. The reverse speed is selected by the throttle sensor 54 which outputs, the engine speed sensor 56 which outputs the engine speed N _E , and the shift lever (not shown). And a reverse switch 57 for detecting whether or not it is provided.

As shown in FIG. 2, the fluid pressure source 35 is rotatably driven by an electric motor 35a, and an oil pump 35c for boosting the working oil in the reservoir 35b to supply it to the input port of the clutch mechanism 37, A check valve 35d inserted on the discharge side of the oil pump 35c, an accumulator 35e connected to a pipe line between the check valve 35d and the input port, and the accumulator 3
And a relief valve 35k connected to the connection point 5e,
The pressure control valve 50 is connected between the connection point of the accumulator 35e and the input port of the clutch mechanism 37.

In the electric motor 35a, one end of the excitation winding is connected to the positive battery power source B via the motor relay 35h and the other end is grounded. The motor relay 35h is connected to the accumulator 35e and the pressure control. Pressure switch 3 that operates by detecting the line pressure in the line between the valves 50
The drive is controlled based on the detected value of 5i. That is, the base of the transistor 35j forming the switching regulator is connected to the positive battery power source B via the pressure switch 35i.
, The collector is connected to the positive battery power source B via the relay coil of the motor relay 35h, and the emitter is grounded. Therefore, the line pressure in the pipeline between the accumulator 35e and the pressure control valve 50 is set to a predetermined set pressure. In the above case, the pressure switch 35i is turned off, the switching transistor 35j is also turned off, and the normally open contact t of the motor relay 35h is opened to open the electric motor 35.
a becomes a non-energized state, and accordingly, the electric motor 35a
Is stopped and the hydraulic oil pressure equal to or higher than a predetermined set pressure as the line pressure is relieved via the relief valve 35k.

On the other hand, when the line pressure in the line between the accumulator 35e and the pressure control valve 50 is less than the predetermined set pressure, the pressure switch 35i is turned on, and accordingly the switching transistor 35j is also turned on. 35h is energized and its normally open contact t
Is closed and the electric motor 35a is rotationally driven, whereby the line pressure of the pipeline is increased by the oil pump 35c. As described above, a substantially stable working oil pressure is supplied from the fluid pressure source 35 toward the primary side of the pressure control valve 50.

The pressure control valve 50 is constituted by a so-called electromagnetic proportional control type secondary pressure constant type pressure reducing valve, and is provided between the drain port of the pressure control valve 50 constituted by this pressure reducing valve and the tank 62. A drain pipe 63 is provided. In the pressure control valve 50, the opening degree of the spool arranged in the pressure reducing valve is determined according to the value of the command current I _SOL supplied to the proportional solenoid 50a, whereby the secondary side of the pressure reducing valve, that is, The control pressure P _C on the clutch mechanism 37 side is maintained on the primary side, that is, at the set pressure according to the command current I _SOL regardless of the pressure fluctuation to the input port of the pressure reducing valve. After all, the pressure P of the hydraulic oil supplied to the input port of the clutch mechanism 37 increases or decreases in a quadratic curve in proportion to the command current I _SOL .

As a concrete structure of the electromagnetic proportional control type secondary pressure constant type pressure reducing valve used in the pressure control valve 50, for example, Japanese Patent Laid-Open No. 2-68 previously proposed by the present applicant is proposed.
See the one described in Japanese Patent No. 225,225.

On the other hand, the vehicle speed sensor 51 outputs to the controller 60 a vehicle speed detection value V consisting of a voltage output that increases in the positive direction according to the vehicle speed in front of the vehicle. Further, the wheel speed sensors 52FL to 52RR are provided at appropriate positions of the respective wheels, and detect the number of rotations of the wheels by an optical system or an electromagnetic system,
The wheel speed signals V _{FL to} V _RR based on the pulse signal or the sine wave voltage signal corresponding thereto are individually output to the controller 60. Also, the throttle sensor 5
Reference numeral 4 is composed of a potentiometer and a voltage detector for detecting the voltage of the potentiometer for detecting the opening degree of the throttle obtained as the accelerator operation amount. When the accelerator operation amount is "0", that is, the accelerator pedal The throttle opening when there is no depression is 0%, and the throttle opening when the accelerator pedal is depressed to the limit is 10%.
0%, as shown in FIG. 3, the output voltage value of the throttle sensor when the throttle opening is 0% is v ₁ [V], and the voltage value when the throttle opening is 100% is v
₂ [V], and during that time, the throttle opening detection signal θ, which is a voltage output that gradually increases according to the amount of depression of the accelerator pedal, is output to the controller 60.

Further, the engine speed sensor 56 is
The number of revolutions of the engine is detected from the ignition ignition pulse of the engine, and the number of revolutions N _E of the engine composed of a pulse signal having a cycle corresponding to this is output. Further, the reverse switch 57 outputs a detection signal which is turned on only when reverse movement is selected by a shift lever (not shown).

The controller 60 comprises a microcomputer 70 and a drive circuit 61 for supplying the command current I _SOL to drive the pressure control valve 50. Further, the microcomputer 70 includes an input interface circuit 70a having an A / D conversion function for reading a detection signal from each sensor as each detection value, and an arithmetic processing unit 70b.
A storage device 70c such as a ROM and a RAM, and an output interface circuit 70d having a D / A conversion function for outputting the clutch engagement force control signal S _T obtained by the arithmetic processing device 70b.

Then, in the microcomputer 70 of the controller 60, the fully closed reference value θ ^* which is the voltage value of the throttle opening detection signal when the throttle opening is fully closed according to the control processing of FIG. 4 described later. When the input detection values satisfy predetermined conditions and the throttle opening can be regarded as a fully closed state, the throttle sensor 5
Based on the throttle opening detection signal θ from 4, the fully closed reference value θ ^* is obtained. Then, the driving force distribution control process is executed in accordance with the control process of FIG. 5, and when the vehicle speed is equal to or lower than a preset predetermined value, the input throttle opening detection signal θ and the calculated fully closed reference value θ ^The throttle opening TH is calculated based on ^* and the clutch torque T is calculated according to the control map of FIG. 6 based on the calculated throttle opening TH.
Ask for. When the vehicle speed is equal to or higher than the predetermined value,
Based on the wheel speed signals V _{FL to} V _RR , the rotational speed difference ΔV between the front and rear wheel speeds is calculated, the clutch torque T is calculated in accordance therewith, and the control signal S _T that achieves this is output to the drive circuit 61.
Output to.

Further, the storage device 70c is the processing unit 7
The program and fixed data necessary for the processing at 0b are stored in advance, and the processing result can be temporarily stored. Among these, the fixed data includes a storage table showing the control characteristics shown in FIG. 6, and FIG. 6 shows the control characteristics of the clutch torque T with respect to the throttle opening TH.

The drive circuit 61 converts, for example, a control signal S _T output from the microcomputer 70 into a command current I _SOL which is a drive signal for the proportional solenoid 50a of the pressure control valve 50. It is composed of a constant voltage circuit and the like.

Next, the operation of the above-described embodiment will be described with reference to a flowchart showing the processing procedure of the reference value setting processing shown in FIG. 4 and the driving force distribution control processing shown in FIG. The reference value setting process and the driving force distribution control process are performed for a predetermined time (for example, 20 ms).
This is executed by timer interrupt processing for each ec).

In the reference value setting process, first, step S1
Then, the throttle opening detection signal θ from the throttle sensor 54 is read and stored in a predetermined storage area such as the storage device 70c. In this storage area, a plurality of throttle opening detection signals θ can be stored,
The throttle opening detection signal θ for 5 seconds before the present time can be stored.

Next, at step S2, the throttle opening detection signal θ which is a voltage value from the throttle sensor 54 is
Within a predetermined range in which the throttle opening can be considered to be in the fully closed state (for example, a preset voltage value θ _INT when the throttle opening is in the fully closed state (in the case of the throttle sensor of FIG. 3, v ₁ [V ]) Is within the range of θ _INT ± 0.25 [V]), and the fluctuation of the voltage value of the throttle opening detection signal θ for a predetermined time (for example, 5 seconds) is a predetermined value θα.
(For example, 0.04 [V]) or less, and it is determined whether the throttle opening detection signal θ is substantially constant at a value near the voltage value θ _{INT in the} fully closed state. If it can be considered that the throttle opening detection signal θ is substantially constant near the voltage value θ _{INT in the} fully closed state, step S3.
When the throttle opening detection signal θ cannot be regarded as being substantially constant near the voltage value θ _{INT in the} fully closed state, the processing is ended.

In step S3, after the engine is operated, that is, the engine speed N _E from the engine speed sensor 56 is n _E (for example, 400 [rpm]).
When the engine speed reaches N _E ≧ n _E , a predetermined time tα
It is determined whether (for example, 10 minutes) or more has elapsed, and if a predetermined time has elapsed, the process proceeds to step S4, and if the predetermined time has not elapsed, the process ends.

In step S4, the engine speed N
_E is equal to or less than a predetermined value N.alpha (e.g. 850 [rpm]), in the case of N _E ≦ N.alpha, the process proceeds to step S5, the wheel speeds from the wheel speed sensors 52FL~52RR It is determined whether the signals V _{FL to} V _RR are zero. Then, if N _E ≦ Nα is not satisfied in step S4 and if V _{FL to} V _RR is not zero in step S5, the process ends.

If V _{FL to} V _RR is zero in step S5, it is considered that the throttle opening is in the fully closed state, the process proceeds to step S6, and the storage device 70c is processed in step S1. Stored in a predetermined storage area of
The throttle opening detection signal θ for a second is read, an average value of these is calculated, and this is updated and stored in a predetermined storage area (reference value holding means) as a fully closed reference value θ ^* . It should be noted that this storage area is formed by battery backup or the like so that the stored data can be held even after the power is cut off.
If the fully closed reference value θ ^* has never been calculated, the voltage value θ in the fully closed state set in advance as the initial value is set.
It is assumed that _INT is set.

On the other hand, in the driving force distribution control process, as shown in FIG. 5, first, in step S11, the vehicle speed detection value V from the vehicle speed sensor 51 is set to a predetermined value Vα (for example, 20 [km / km).
h]) It is determined whether or not the following. And V ≦ Vα
If it is, it is determined that the vehicle speed is low, and step S1 is performed.
2, the throttle opening detection signal θ from the throttle sensor 54 is read. Then, in step S13,
The throttle opening TH [%] is calculated based on the following equation.

TH = (θ−θ ^* ) × Gθ In the equation, θ is a throttle opening detection signal which is a voltage value from the throttle sensor 54, and θ ^* is a predetermined storage area set in the reference value setting process. Fully closed reference value, Gθ stored in
Is the output of the throttle sensor set in advance according to the performance of the throttle sensor, that is, the ratio of the change in the throttle opening TH [%] to the change in the throttle opening detection signal θ [V], as shown in FIG. is there.

Next, at step S14, the clutch torque T corresponding to the calculated throttle opening TH is calculated based on the detection signal from the reverse switch 57 based on the preset control map shown in FIG. Set. At this time, when the detection signal of the reverse switch 57 is in the ON state and the vehicle is moving backward, the clutch torque T is set based on the control characteristic indicated by the alternate long and short dash line in the control map, and conversely, when the vehicle is moving forward, based on the control characteristic indicated by the solid line. To set.

On the other hand, in step S11, the vehicle speed V is V
If ≦ Vα is not satisfied, the vehicle speed is determined to be not low, and the process proceeds to step S15, and the wheel speed signals V _{FL to} V _FL from the wheel speed sensors 52 _FL to 52 RR are determined in the same manner as in the conventional case.
Wheel speed signals to each other on the front wheel side based on the _RR, and by determining the average value of the wheel speed signals to each other on the rear wheel side, respectively, the wheel speed detection value Vw of the front-wheel-side wheel speed detection value Vw _F and the rear wheel side of the _R is calculated respectively, and from the wheel speed detection values Vw _F and Vw _R of the front and rear wheels, the front and rear wheel speed difference ΔV (ΔV =
Vw _R -Vw _F) is calculated. Then, for example, the clutch torque T is obtained based on the front-rear wheel speed difference ΔV and a predetermined control gain.

Then, step S14 or step S1
When the clutch torque T is calculated in the process of 5, the process proceeds to step S18, and the command current I _SOL to be supplied to the proportional solenoid 50a of the pressure control valve 50 in order to realize the calculated clutch torque T is calculated. , The process proceeds to step S19, and the control signal S _T corresponding to the value of the command current I _SOL calculated in step S18 is output to the output interface circuit 70.
The signal is output to the drive circuit 61 via d, and the processing ends.

As a result, the drive circuit 61 converts the control signal S _T into the command current I _SOL and outputs it to the proportional solenoid 50a. Therefore, by this Sadamari spool opening disposed in the pressure control valve 50 in accordance with the value of the command current I _SOL, the set pressure of the control pressure P _C of the clutch mechanism 37 side corresponding to the command current I _SOL The adjustment is performed, and the fastening force of the clutch mechanism 37 is adjusted.

Here, the processing of steps S1 to S5 corresponds to the fully closed state detecting means, the processing of step S6 corresponds to the reference value setting means, and the processing of step S13 corresponds to the throttle opening calculating means. .

Therefore, if the vehicle is stopped for a predetermined time (for example, 10 minutes) with the engine operating and the accelerator pedal released, the throttle opening detection signal θ of the throttle sensor 54 is set in advance. Is within the predetermined range and the throttle opening detection signal θ is, for example, 5
The fluctuation of the voltage value for a second is within a predetermined value θα, and the throttle opening detection signal θ is in a state near the voltage value θ _{INT in the} fully closed state, and it can be considered that the fluctuation is small. Also, a certain time has passed since the engine started,
At this time, the engine speed N _E is a predetermined value N α (for example, 8
50 [rpm]) or less and the vehicle speed is zero. Therefore, in the reference value setting process, it is determined that the throttle opening is in the fully closed state.
An average value of a plurality of throttle opening detection signals θ for a second is obtained, this is set as a fully closed reference value θ ^* , and stored in a predetermined storage area.

When the vehicle starts, while the vehicle is traveling at a predetermined value Vα (eg, 20 [km / h]) at a low speed, the clutch is opened according to the control map of FIG. 6 based on the throttle opening TH. The torque T is set.

That is, for example, as shown in FIG.
Sometimes the throttle opening is 0-TH _TwoVery low opening degree
Occasionally, the clutch torque T has a throttle opening of 0 to T.
H₁Very low torque T between₁Degree, throttle opening is T
H₁~ TH_TwoDuring the period increases as the throttle opening increases.
The throttle opening is set to TH_Two~ TH_FourOf degree
While the opening is relatively low, T with relatively low torque_TwoSet to
It is. Then, after that, as the throttle opening increases,
The latch torque T is also set to increase. Also after
When advancing, the throttle opening is TH_ThreeUntil the degree
The clutch torque T is set in the same way as when moving forward,
Torr opening is TH_ThreeAbove a certain level, relatively high torque T_ThreeTo
Is set.

Then, the vehicle speed V becomes equal to or higher than the predetermined value Vα.
And each wheel speed from each wheel speed sensor 52FL to 52RR
Signal V_FL~ V_RRBased on the
The average value of the wheel speed signals on the rear wheel side should be calculated respectively.
And the wheel speed detection value Vw on the front wheel side_FAnd on the rear wheel side
Wheel speed detection value Vw_RAre calculated respectively, and these front and rear wheels
Wheel speed detection value Vw_FAnd Vw_RTherefore, the front-rear wheel speed difference Δ
V (ΔV = Vw_R-Vw _F) Is calculated. And an example
For example, the front-rear wheel speed difference ΔV and the preset control gain are
Originally, the clutch torque T is set.

When a predetermined condition is satisfied in the reference value setting process and the throttle opening can be regarded as a fully closed state due to, for example, the vehicle stopping during traveling, the above Similarly, the average value of the throttle opening detection signal θ is calculated, and this is updated and set as a new fully closed reference value θ ^* . In addition, for example, when the engine is started immediately after starting, such as when the engine does not satisfy the predetermined condition for setting the reference value and the vehicle is started in a state where the fully closed reference value θ ^* is not calculated, The clutch torque T is set based on the fully-closed reference value θ ^* at the time of the previous calculation stored by the battery backup.

Then, based on the clutch torque T thus set, the driving force is distributed to the front wheels. Therefore, the fully closed reference value θ ^* is a value set based on the average value of a plurality of throttle opening detection signals θ in a state where the throttle opening can be regarded as a fully closed state. Since the degree detection signal θ is set in a state where there is little fluctuation, a value with a small deviation is set with respect to the plurality of throttle opening degree detection signals θ in the fully closed state. Further, since it is set based on the throttle opening detection signal θ in the fully closed state at the present time, the throttle opening detection signal θ in the actual fully closed state due to, for example, an installation error or the like.
Even when the voltage value of is different from the voltage value θ _{INT in} the fully closed state at the time of initial setting, the voltage value in the fully closed state at the present time can be set.

Therefore, the throttle opening detection signal θ input from the throttle sensor 54 is offset based on the fully closed reference value θ ^* thus set, and the throttle opening TH is calculated based on this value. As a result, the throttle opening TH can be calculated with higher accuracy.

At this time, the fully closed reference value θ ^* can be set on the basis of the throttle opening detection signal θ without providing an idle switch or the like. When the fully closed reference value θ ^* is set based on this, if the idle switch fails, the throttle opening TH cannot be detected even if the throttle sensor 54 is operating normally. In the case of the above-described embodiment, the throttle opening TH is detected only on the basis of the throttle opening detection signal θ. Therefore, if the throttle sensor 54 is operating normally, the throttle opening TH is surely obtained. Can be detected.

The full-closed reference value θ ^* is held by the battery backup even after the power is cut off. Therefore, for example, when the throttle opening cannot be regarded as the fully closed state, Since the fully closed reference value θ ^* set at the previous time is held, the throttle opening TH can be calculated based on this to obtain a highly accurate throttle opening TH.

Therefore, the throttle opening TH can be detected with high accuracy based on the throttle opening detection signal θ of the throttle sensor 54.
It is possible to perform fine control based on H, and to set an accurate clutch torque T even when traveling at an extremely small throttle opening TH, so that it is possible to improve startability and to stabilize the vehicle. The running condition can be obtained.

In particular, as shown in the control map of FIG. 6, the clutch torque T can be finely set according to the fine fluctuation of the throttle opening TH. Therefore, the clutch torque T can be accurately set when the throttle opening is extremely low, so that the starting performance can be improved and the tight corner braking phenomenon can be avoided to maintain a stable running state. it can.

In the above embodiment, the case where the present invention is applied to the four-wheel drive vehicle based on the rear-wheel drive vehicle has been described, but the same applies to the four-wheel drive vehicle based on the front-wheel drive vehicle. The effect can be obtained.

In the above embodiment, the case where the detection value processing device of the throttle sensor according to the present invention is applied to the driving force distribution control device has been described, but the present invention is not limited to this.
For example, an engine control device, an automatic transmission control device, or the like can be applied to any device that performs processing based on the throttle opening TH based on the output signal of the throttle sensor. It is possible to obtain a proper throttle opening TH, and more accurate control can be performed.

In the above embodiment, the case where the control device is constituted by a microcomputer has been described. However, the present invention is not limited to this, and the control device may be constituted by combining electronic circuits such as a shift register and an arithmetic circuit.

In the above embodiment, the case where a hydraulic friction clutch driven by hydraulic pressure is used as the clutch mechanism has been described, but the present invention is not limited to this, and any clutch that can continuously distribute the driving force, such as an electromagnetic It can also be applied to a clutch mechanism or the like.

Further, in the above embodiment, the case where the working oil is applied as the working fluid for urging the variable torque clutch has been described, but the present invention is not limited to this, and a fluid such as water or a gas such as air may be applied. it can. Further, the pressure control valve is not limited to the pressure reducing valve, and a pressure control valve capable of controlling the pressure on the secondary side in response to another command value may be applied. Further, the rotation drive source of the oil pump is not limited to the electric motor, and the rotation output of the engine can be used.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a vehicle configuration showing an example of a four-wheel drive control device to which a detection value processing device of a throttle sensor according to the present invention is applied.

FIG. 2 is a schematic configuration diagram showing an example of a driving force distribution control device between front and rear wheels in FIG.

FIG. 3 is an output characteristic diagram showing a correspondence between a throttle opening and a throttle opening detection signal of a throttle sensor.

FIG. 4 is a flowchart showing an example of a reference value setting process in the driving force distribution control device.

FIG. 5 is a flowchart showing an example of a driving force distribution control process in the driving force distribution control device.

FIG. 6 is a clutch torque T based on a throttle opening TH.
3 is a control map for calculating and setting

FIG. 7 is an explanatory diagram of a calculation process of a throttle opening TH.

[Explanation of symbols]

 1 engine 2FL to 2RR front left wheel to rear right wheel 4 driving force distribution control device 37 clutch mechanism 50 pressure control valve 51 vehicle speed sensor 52FL to 52RR wheel speed sensor 54 throttle opening sensor 56 engine speed sensor 57 reverse switch 60 controller 61 drive Circuit 70 Microcomputer

Claims (3)

[Claims] 1. A detection value processing device for a throttle sensor, which detects a throttle opening based on a detection value corresponding to a throttle opening from a throttle sensor,
Based on a plurality of detection values of the throttle sensor in a state in which the throttle opening is estimated to be in a fully closed state, a fully closed reference value that is the detected value when the throttle opening is in a fully closed state is set. However, the throttle opening is calculated from a value obtained by offsetting the detection value of the throttle sensor by the fully closed reference value and a ratio of a change in the throttle opening with respect to a change in a preset detection value. Detection value processing device for throttle sensor. 2. A detection value processing device for a throttle sensor, wherein the throttle opening is detected based on a detection value corresponding to the throttle opening from the throttle sensor,
A fully closed state detecting means for detecting that the throttle opening is in a fully closed state, and a plurality of detection values from the throttle sensor in a state where the fully closed state detecting means detects the fully closed state. Based on the reference value setting means for setting a fully closed reference value which is the detected value when the throttle opening is in the fully closed state, and a value obtained by offsetting the detected value of the throttle sensor by the fully closed reference value. And a throttle opening calculation means for calculating the throttle opening based on a rate of change of the throttle opening with respect to a change of a preset detection value. 3. The throttle sensor detection value processing device according to claim 2, wherein the full-closed reference value setting means includes reference value holding means capable of holding the full-closed reference value even after power-off. .