JPS5927230A - Torque sensor - Google Patents

Abstract

PURPOSE:To set zero torque electrically, by electrically detecting the neutral state of a transmission gear, storing the phase difference between pulse signals under this state as zero torque, and detecting the torque value with the stored value as a reference. CONSTITUTION:Alternately different magnetic poles are arranged on a pair of magnetic pole trains 11 and 12. The magnetic pole trains 11 and 12 are fixed to different position in the axial direction of an output shaft 10 of a transmission gear. Magnetic variation caused by the rotation of the magnetic pole trains is detected by magnetic sensors 13 and 14. Every time the transmission gear is changed to the neutral state, a neutral switch 27 is switched to a closed position. The voltage of a signal line 29 for detecting the neutral state is changed from an H level to an L level. The phase difference between pulse signals is written in a CMOS RAM28 and stored as a reference value for zero torque. A microcomputer 26 compares and operates the reference value and the phase difference between the pulse signals. The signal corresponding to the torque of the output shaft 10 is outputted from an output port 30. The output is applied to a display which is not shown, and the detected torque value is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque sensor that electrically detects torque of an output shaft of a vehicle transmission.

Generally, this type of device 1<+ includes a set of rotation detecting means disposed at different positions in the axial direction of the output shaft of a vehicle transmission for generating each pulse signal according to the rotational position of the output shaft. Since there is a phase difference between the pulse signals (the torque of the output shaft is detected by C2), the standard setting of zero torque is such that both pulse signals output from the two rotational position detection means have no phase difference. Do it in a timely manner.I
L, in order to match these two pulse signals, the rotational position 11'
It is necessary to mechanically adjust the C detection means, and this
! J straightening work is frequent and requires jigs and measuring instruments.21
There were drawbacks.

Therefore, the object of the present invention is to electrically set the reference torque of zero in order to eliminate the drawbacks mentioned above.

In order to achieve this purpose, a neutral state detector electrically detects the neutral state of the transmission and outputs a detection signal, and a pulse signal is provided when the detection signal is output. The basic structure of the present invention is to provide a memory means for storing the phase difference between the two as zero torque.

Therefore, with this configuration, the present invention electrically detects the neutral state of the transmission, stores the phase difference of the pulse signal amount in this state as zero torque, and uses the stored value to detect the reference torque value. The reference torque zero can be set electrically, eliminating the need for mechanical adjustment work, measuring instruments, jigs, etc., achieving the initial purpose, and also making it easier to install the rotational position detection means. Even if there is a slight deviation or a change over time, the reference torque of zero can be immediately set as soon as the transmission is in a neutral state, and high accuracy can be maintained permanently, which is another advantageous effect.

An embodiment of the apparatus of the present invention will be described below with reference to the drawings.

10 is the output shaft of the transmission, and a set of magnetic pole rows 11 and 12 in which different magnetic poles are arranged alternately is fixed at different positions in the axial direction, and the mR'R rows 11, 1
The magnetic change due to the rotation of the magnetic sensor 1 is detected by each magnetic sensor 18 i 14, which is a pick-type knob, for example.
From 3.14, the AC waveform TI't[E outputs Sjl according to the rotational change of the magnetic pole array 11.
．． 16t trowel waveform shaping fin, Fig. 2 (al, (b)
The pulse signal shown in is output from the waveform shaping circuit 15.1 (3. The pulse signal output from both waveform shaping circuits 15.16 is input to the phase comparator 17). The phase difference signal 2171(o) is generated from the device 17 as a signal corresponding to the phase difference of the 1ild pulse signal, and this phase difference signal is generated by the torsion or torque between the magnetic pole arrays 11 and 12 of the output shaft 1(). It changes depending on ′・.

This phase difference signal and the oscillation output from the oscillator 18 are NANDed.
The circuit 19 is powered by human power i'L and outputs a pulse signal proportional to the phase difference signal, and this state is shown in Fig. 8(a).
, (b) If we explain based on CC1, the phase>i'! as shown in FIG. 8(a). Signal and Figure 8 (b
) The oscillation output of the oscillator 180 as shown in FIG.

The pulse signal from this NAND circuit 19 is sent to the counter 20.
The count value is held in the latch 21. Further, the oscillation output of the oscillator 18 is counted by the counter 22, and the count value is held in the latch 28.
'L. The pulse signal from the waveform shaping circuit 16 is frequency-divided by a counter 24 (for example, 1/10) and the output of the counter 15 is used to reset both counters 20.22 and 115 and latches 21.28.

The contents of the latches 21 and 23 are periodically read from the manual boat 25 to the microcomputer 26, and the microcomputer 26 reads the values loaded from the latch 21 with '6' and 'l' from the latch 28 every time the counter z4 outputs. Perform the operation of dividing by the value to obtain the division value 2. This division value is the fourth
To explain based on FIGS. (a), (b), (0), and (d), the waveform rectifying circuit 16 shown in FIG. 4(a)
During the period S until the output pulse signal is counted by the counter 24, the phase comparator 1 shown in FIG. 4(b)
According to the output of 7, the NAND circuit 19 shown in FIG. 4(C)
The pulse signal which is the output of oscillator 9 is counted by the counter 16, and this count f is held in the direct latch 21, and the oscillation output from the T oscillator 9 shown in FIG. 4(d) is counted by the counter z2.
This count value is held in the latch 28 p2'L, and the count value held in the latch 21 is divided by the count value held in the latch 28 nT.

On the other hand, each time the vehicle transmission switches to the neutral state, the neutral state detection signal line 27 switches to close and is connected to the human-powered boat 25 of the microcomputer 2G. 29 is ``The voltage changes from HJ level to I-L J level, and with that change in voltage, the above division value in this case is Cp.
The value is read into the O8RAM 28 and stored as a reference value for zero torque. Thereafter, the microcomputer 26 compares and calculates this reference value with the oil mud remover 7V value, and outputs a signal corresponding to the torque of the output shaft 1.0 from the microphone IF knee 1 user 26 (4-output boat 80). The torque sensor of the present invention applies the output to a display device (not shown) and displays the detected torque value.
Since torque is set to zero with any phase difference of the phase difference signal without specifying whether the phase difference is zero or not, it is possible to detect both increases and decreases in the phase difference with respect to the set phase difference. Therefore, not only torque detection in the positive direction but also
Torque detection in the negative direction can also be performed.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing one embodiment of the device of the present invention, and FIG.
Figures (a), (b), (0), Figure 8 (a),
(13), (Q), and Figure 4 (a), (1
)), Co), (d) is an explanatory diagram showing Figure 1.
c'a-ru. 10... Output shaft, 11.12... Magnetic pole array, 13.
14...Magnetic sensor, 17...Position O11 ratio IJi,
27...neutral switch, 28...CMOS
RAM (storage means), 26...Microcomputer patent applicant Reio Nakai, representative of Aisin Seiki Co., Ltd.

Claims (1)

[Claims] A set of rotational position detection means that generates each pulse signal according to the rotational position of the output shaft is disposed at different positions in the axial direction of the output shaft of the vehicle transmission, and the phase difference between the pulse signals is detected. In the torque sensor that detects the torque of the output shaft indicated by n1, there is a neutral state detection means for detecting the neutral state of the transmission indicated by It i and outputting the detection signal, and a neutral state detection means for detecting the neutral state of the transmission indicated by It i and outputting the detection signal. and storage means for storing the phase difference between the pulse signals as zero torque, and detects a torque value based on the stored value.