JPS6141044A - Speed change stage discriminating apparatus of speed change gear - Google Patents

Abstract

PURPOSE:To easily discriminate the speed change position from the relative angle between the contiguous members which varies according to the position of a speed change lever by connecting one contact point of a link mechanism consisting of four link members to the speed change lever and fixing the contact point position at the opposite angle position to the above-described contact point. CONSTITUTION:The captioned speed change stage discriminating apparatus is installed onto the speed change lever 10 of a speed change gear by the jigs 11a and 11b having two-divided structure, and has four link members 12-15. The contact point of the link members 12 and 13 is pivotally installed onto the jig 11b by a shaft 16, and the contact point of the link members 14 and 15 at the opposite-angle position to the shaft 16 is pivotally installed as fulcrum 17 at an arbitrary position close to the lever 10 in car interior. Though a rotary encoder 18 is installed onto the contact point of the link members 12 and 15, the case 18a is fixed onto the link member 15 by a machine screw 18b, etc., and one edge of the link member 12 is integrally connected to the revolution shaft 18c. The relative angle between the link members 12 and 15 is detected by the rotary encoder 18, and the position of the speed change stage is discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for determining the gear position of a transmission having a shift lever for measurement control.

Problems to be Solved by the Prior Art and the Invention There are roughly two types of means for determining the gear position of a transmission.

One is to incorporate it inside the transmission like the bassoquaso plump iso, chi when the vehicle is backing up, and in this case there is no problem with operation. However, in the case of measurement control applications that require this to be set in all forward gears, additional design and modification of the inside of the transmission is required, and this is not practical for measurement control applications that target unspecified and large numbers of vehicles. is not possible. Therefore, conventionally, a method of detecting the position of a gear shift lever of a transmission using a micro-sinch or a limit switch has been widely used. These use the same number of switches as the number of gears, and determine the gear by the switch that is on, and also use switches and logic circuits to detect the direction of movement of the gear lever (front, rear, left, right). - A method for determining the six lever positions. However, the gear lever has
There is always some play caused by the various link mechanisms from the lever to the inside of the transmission, and the lever is constantly vibrating due to vibrations from the engine and drive system while driving, which can cause the switch to malfunction and cause gear changes. The determination of step position was inaccurate. Further, the above-mentioned switch needs to be installed in an optimal position for each vehicle to be measured, and therefore, when installing the switch, it is unavoidable to manufacture a switchable bracket for each vehicle.

Furthermore, in automatic transmissions in which all gear positions of the shift lever are on the same straight line, discrimination using a general micro-sinch or limit switch is impossible due to structural limitations of the switch.

Furthermore, conventionally, there is a device that extracts the engine rotational speed and the vehicle speed as pulses and performs calculations to determine the gear position, but this cannot determine the gear position when the clutch is in the half-clutch state. A method has also been devised to calculate the gear position from the rotational speed ratio of the input shaft and output shaft of the transmission, but this requires modification of the transmission in order to detect the rotation of the impact shaft. In addition, in the case of this method, the gate is opened by the output shaft rotation pulse,
In order to count the input shaft rotation speed during that time,
There is a problem in that there is a time delay with respect to the actual shift operation until the determination result is issued, resulting in a non-negligible error during low-speed driving.

Means for Solving the Problems The gear stage discrimination device of the present invention is constructed by linking four members, one contact is removably connected to the shift lever of the transmission, and the A link mechanism in which a contact point at a corner position is fixed, and a means connected to one contact point other than a contact point connected to a shift lever and detecting a relative angle between adjacent link members, and the detected relative angle The system is characterized in that the gear position is determined from the position of the gear.

Function One contact point of the link mechanism made up of four link members is connected to the shift lever, and the contact position diagonally to that contact point is fixed, so the relative position of adjacent members depends on the position of the shift lever. Once the angle changes and the relative relationship between the gear and the relative angle is known, the gear position can then be determined based only on the relative angle.

Example FIG. 1 shows a schematic configuration of an embodiment of the present invention.

In the figure, reference numeral 0 is a shift lever (hereinafter referred to as a shift lever) of a transmission. lla and 11b are jigs for attaching the device of the present invention to arbitrary positions of the shift lever 10, and are configured to be divided into two parts and fixed with bolts. 12, 13, 14 and 15 are four link members that constitute a link mechanism. The contact point of link members 12 and 13 is connected to link member 1 via shaft 16 to jig 11b.
2 and 13 are rotatably attached.

The contact points of the link members 14 and 15 located diagonally to the shaft 16 are fixed as a fulcrum 17 at an arbitrary position close to the shift lever 10 inside the vehicle interior. However, the link members 14 and 15 are rotatable about the fulcrum 17. A low-return encoder 18 is attached to the contact point between the link member 12 and I5. That is, the case 18a of the rotary encoder 18 is integrally connected to the link member 15 by screws 18b, etc., and the rotating shaft 18c of the rotary encoder 18 is integrally connected to one end of the link member 12. Of course, the link members 12 and 15 are rotatable relative to each other about their contact points.

Similarly, the contact points 19 of the link members 13 and 14
They are rotatable relative to each other. The rotary encoder 18 may be attached at the contact point 19 or at the fulcrum 17. An output terminal of the rotary encoder 18 is connected to a signal processing device 21 via a cable 20.

FIG. 2 shows the operation of the link mechanism and rotary encoder 18 described above. As shown in FIG. 2(A), when the shift lever 10 is located far from the fulcrum 17, the relative angle formed by the link members 12 and 17 has a large value α, while as shown in FIG. 2(B) , when the shift lever 10 is located close to the fulcrum 17, the relative angle becomes small to β. These relative angles α and β are detected by a rotary encoder 18. That is, the current position of the shift lever 10 can be determined by knowing the number and rotational direction of the output pulses from the relative rotation of the rotary encoder 18 from the reference position or the previous position.

FIG. 3 shows an example of the configuration of the signal processing device 21 shown in FIG. In this example, a one-chip microcomputer is used to store the gear position, read it, convert it into a 3-bit binary code, and output it. In the figure, 22 and 23 are input terminals to which two-phase square wave pulses having a phase difference of 90 degrees are input from the rotary encoder 18. The pulse sent to the input terminal 22 is D
applied to the CLK input terminal of the type flip-flop 24,
Further, the pulse sent to the input terminal 23 is applied to the D input terminal. As a result, a binary code corresponding to the rotational direction of the rotary encoder 18 is output to the Q output terminal of the D-type flip-flop 24.

FIG. 4 explains this operation. As shown in the figure, the phase of the D input of the D-type flip-flop 24 is CL
If the phase of the CLK input is ahead of the phase of the K input, the rising edge a of the CLK input
The state of the D input latched at is logic "1", so the Q output becomes "1" as shown in C. When the rotary encoder 18 rotates in the opposite direction in this state, the CLK input becomes a state in which the phase leads the D input, and the state b' of the D input, which is launched at the rising edge a' of the CLK input, is logic "0".
This appears as a Q output of 0'' as shown in C'. Due to the operation of the flip-flop 24, the I10 port P3 of the 1-chip microcomputer 26
The rotational direction of the low-resolution encoder 18 is input as a 1-bit binary code to the 30th bit.

In FIG. 3, 25 is a timer, and the pulse (CLK input) sent to the input terminal 22 is input to the interrupt request terminal box of the microcomputer 26 after being delayed for a certain period of time. This operation will be further explained using FIG. 4. After the pulse at the input terminal 22 is delayed for a time t by the timer 25, its logic is inverted, and at its falling edge h, the microcomputer 26 reads the data of P3.

At this time, the 30-bit input i is delayed by time t from the timing g at which an input change can occur, and data reading during an input change is prevented. This is h l in the same figure,
The same applies to CI and i1, and through this series of operations, the microcomputer 26 can reliably know the direction of rotation of the low-return encoder 18.

In FIG. 3, reference numeral 27 denotes a switch group for generating a signal representing the gear position, and is provided for storing each gear position. A priority encoder 28 converts the signal from the switch group 27 into a 3-bit binary code. The output of this priority encoder 28 is the I10 port P4 positive 4 of the microcomputer 26.
Applied to bits 0 to 43. Also on the same P4 floor 44~
The output of the BCD-10 decoder 29 is applied to the BCD-10 decoder 29 to drive the light emitting element group 30. 31 is a clock oscillation circuit of the microcomputer 26, 32 is a reset circuit, and 33 is an output terminal of a buffer 34 for outputting a 3-bit gear position signal to the outside. 35 is a digital rotary switch, and this switch outputs a 4-digit BCD code signal which is applied to floors 34 to 37 of P3 of the microcomputer 26. This rotary switch 35 is provided in order to set the width of a dead zone against rattling vibration that is not desired to be detected and to make a strict determination in consideration of the internal structure of the transmission. The necessity of this strict discrimination will be explained using FIG. 5.

A link mechanism is attached to the shift lever 10 via the aforementioned jigs 11a and llb. Shift lever 1
0 uses a spherical seat 38 provided on a transmission case 37 as a fulcrum, and slides a shift fork shaft 40 on its tip 39.

When the shift fork 41 fixed to the shift fork shaft 40 slides the hub sleeve 42 and moves it to the position shown in the figure, the transmission shaft 43 and gear 44 are connected to the spline 4 on the shaft 43.
5. Connected via a thalassochi hub 46, a hub sleeve 42, and a gear spline piece 47. However, when the hub sleeve 42 is at position j in the figure, although it is connected to the synchronizer ring 48, it is not connected to the gear 44 and gear spline piece 47, and is still in the neutral state at this time. It is in. A rotary switch 35 shown in FIG. 3 is provided to accurately determine this slight difference in position of the hub sleeve 42.

Next, a program for operating the microcomputer 26 will be explained. 6 and 7 are schematic flowcharts of the program, and FIGS. 8 to 10 are detailed flowcharts. FIG. 8 shows details between FIG. 6 A and B. The microcomputer 26 is reset and I
After initial settings 200 such as input/output definitions for the 10 ports are performed, the microcomputer 26 first performs step 301.
At this point, the state of P4 is read. The state of the 43rd bit of P4 determines which setting the set/measurement changeover switch shown in FIG. In the case of "front/back", the relationship between the measured value of the rotary encoder 18 and each gear stage is determined. First, in step 303, by ANDing the data of P4 and "Q7" in hexadecimal notation,
7 is ignored, and which switch in the switch group 27 is pressed is determined. If SP='Q (no switch is pressed), return to ■. If any switch is pressed, the number of the pressed switch is held in the SP. For example, in neutral, 5P=1, 1st
5P = 2 in the second stage, 5p = 3 in the second stage, 5P in the third stage
= 4, 5P = 5 in the fourth stage, 5P = 6 in the fifth stage, and 5p = 7 in the bank. Step 3
In steps 05 to 308, the address NA subtracted by 1'' from the neutral address is added to this SP to obtain a shift position storage address SA, and the count value CTR of pulses from the rotary encoder 18 is stored in this address SA.

In steps 309 to 312, the light emitting element corresponding to the pressed switch in the switch group 27 is turned on to notify the operator that the shift position has been memorized.

That is, in step 309, the SP is shifted by 4 bits to move it to the 44th to 47th bit side of P4, and this is sent to the decoder 29 to drive the light emitting element group 30. 0
．． After 5 seconds have elapsed, through the processing in steps 313 to 316, it is confirmed that the once pressed switch has been returned to its original state, the light emitting element group 30 is turned off, and the process proceeds to (2). That is, N1140 of P4
-43 bits are read again, and after confirming that SP has become O, this SP is output to the light emitting element group 30, and the light is turned off.

FIG. 9 shows in detail the contents of the processing after ``2'' in FIG. 6. In step 400, it is checked whether the switch 36 is switched to "measurement". In steps 501 and 502, the value indicated by the low reswitch 35 is calculated. In steps 503 to 511, the pulse count value of the rotary encoder 18 at that time is compared with the counter value stored corresponding to each gear position, and a gear position that matches within the range of the value of the rotary switch 35 is determined. The positions are searched, and if there is a match, that position is held as a gear stage, and if none match, it is determined that all the positions are neutral and the process proceeds to step 512. In step 512, bit 11k of I10 port P1
The gear position is output as a binary code in steps 110 to 12, and the light emitting element corresponding to the corresponding gear is turned on in steps 513 to 514, and the process returns to (2).

In this way, the gear stage is constantly determined according to the output of the low-return encoder 18.

FIG. 10 shows an interrupt routine activated by a falling input pulse to the IRQ terminal of the microcomputer 26. This interrupt routine is activated for each output pulse of the rotary encoder 18, and the number of pulses is added or subtracted depending on the direction of rotation. In step 701, the rotation direction of the low-resolution encoder 18 is set as a binary code.
No. 3, read from 30 bits Step 801, 8
At step 02, the counter is incremented or subtracted depending on the rotation direction, and the process returns. This interrupt routine causes C in the figure to
The latest count number (the angle formed by -4 and 8) is always held in the counter memory indicated by TR.

This interrupt routine consists of steps 100-50 in FIG.
It does not affect any operation between 0 and the value of CTR can be referenced from any position in steps 100-500.

FIG. 11 shows an example of a processing device configured using only logic elements instead of the processing device 21 of FIG. 3. In FIG. Input terminal 2
2 and 23, and the D-type flip-flop 24 are similar to those in FIG. The pulses applied to the input terminal 22 are added or subtracted by three-digit BCD up/down counters 50 to 52 according to the rotational direction of the rotary encoder 18, and the value is displayed on the numeric display 5 via decoder drivers 53 to 55.
6-58. The operator can know the counter value when the shift lever 10 is held at each gear position from these numerical displays 56 to 58, and if necessary, several or more three-digit digital rotary inch displays 59 can be displayed. ~
If we add the value corresponding to each gear to 61, we get
Compare that value with the output values of the up/down counters 50-52 using several or more sets of three-digit comparators 62-64, 65-67 corresponding to the rotary wheels 59-61.
．． 68 to 70 perform the comparison and output the comparison result to the output terminal 72 via the encoder 71 as a binary code.

Effects of the Invention The installation of the device of the present invention is extremely simple and does not require the conventional work of manufacturing, installing, and adjusting brackets.
Measurement preparation man-hours are significantly reduced.

In addition, the sensor uses a low-resolution encoder, and since it is non-contact, its durability is semi-permanent, and there is no need to consider the lifespan and poor contact of conventional switches.

In the case of a switch, the signals are only on and off, so there is a lot of backlash.
There was no way to prevent malfunctions caused by vibration, but in the device of the present invention, the position of any shift lever is expressed as a continuous numerical value, so malfunctions can be completely prevented by using an appropriate processing device. Also, conventional automatic transmissions have all gear positions of the shift lever on the same straight line.

However, the present invention can also be applied to cars with automatic transmissions without any special additional equipment.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation in the embodiment of FIG. 1, and FIG. 3 is a block diagram of an example of the processing device of the embodiment of FIG. FIG. 4 is a time chart for explaining the operation of a part of the processing device in FIG. 3, FIG. 5 is a diagram for explaining the state of connection between the embodiment device in FIG. 1 and the transmission, and FIGS. FIG. 10 is a flowchart of a part of the program of the processing device shown in FIG. 3, and FIG. 11 is a block diagram of another example of the configuration of the processing device. 10--Shift lever 1lla, llb--Jig, 12.13i14, 15- Link member, 16-
shaft, 17--fulcrum, 18- rotary encoder, 19--contact, 21-processing device. Figure 1 Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] A link mechanism consisting of one or four members linked together, one contact point of which is removably connected to a shift lever of a transmission, and a contact point diagonal to the contact point is fixed; means for detecting a relative angle between adjacent link members, the gear position being determined from the detected relative angle. Transmission gear stage discrimination device.