JPS6063435A - Torque detector of engine for automobile - Google Patents

Abstract

PURPOSE:To attain a detector which does not require special structures such as a slip ring by constituting the detector of an input shaft to which a torque is transmitted from an engine output shaft, an output shaft which transmits the torque to a load, a detecting shaft which generates an angle of torsion in accordance with the transmitted torque, a detector for the rotation angle of the input shaft, a detector for the rotation angle of the output shaft, and an operation processing circuit which operates a torque in accordance with rotation angle signals. CONSTITUTION:Gears which are rotated together with an input shaft 1 and an output shaft 2 as one bodies respectively are provided as rotation angle detectors of the input shaft 1 and the output shaft 2, and a magnetic input shaft rotation detector 5 facing an input shaft gear 4 obtains an input shaft rotation angle signal, and a magnetic output shaft rotation detector 7 facing an output shaft gear 6 obtains an output shaft rotation angle signal. A rotative angular speed detecting circuit 103 obtains a rotative angular speed Wr in accordance with an input shaft rotation angle signal P1. A delay time integrating circuit 104 measures a pulse time-lag between the input shaft rotation angle signal P1 and an output shaft rotation angle signal P0. The product between the rotative angular speed and the delay time is a phase difference between the input shaft rotation angle and the output shaft rotation angle. The phase difference is equal to a rotation angle difference thetaE for a transmitted torque T. A torque signal Tf is obtained by a torque operation processing circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a torque detector for an automobile engine.

[Prior art]

Conventionally, a stonon gauge was used as a detector for this mallet.
It was detected by the distortion or torsion angle of the output shaft due to shaft transmission torque. However, in order to detect resistance changes due to strain, a stonon gauge was required to be attached to the output shaft and rotating parts, and a slip ring was required for signal transmission with the compensation circuit.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and its purpose is to provide a torque detector that does not require a special structure such as a slip ring. The features include an input shaft that transmits torque from the engine output shaft, an output shaft that transmits torque to the load, a detection shaft that generates a torsion angle depending on the transmitted torque, a rotation angle detector for the input shaft, and a rotation angle for the output shaft. It consists of a detector and an arithmetic processing circuit that calculates torque according to the rotation angle signal.

[Embodiments of the invention]

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

In FIG. 1, ■ is an input shaft, 2 is an output shaft, and 3 is a detector 1. The gears that rotate integrally with each shaft as a rotation angle detector for the input shaft l and the output shaft 120 are nk '/)' %
This is an example using a magnetic rotation detector in which magnetic vergeance changes as the shaft rotates and generates an electromotive force.

A magnetic input shaft rotation detector 5 facing the input shaft gear 4 obtains an input shaft rotation angle signal, and a magnetic output shaft rotation detector 7 facing the output shaft gear 6 obtains an output shaft rotation angle signal.

FIG. 2 shows the rotation angle difference OE between the input and output shafts with respect to the shaft transmission torque T. It is well known that this changes proportionally to the torque T.

Figure 3 is a block diagram of the torque calculation processing circuit.
．． 102 is a waveform shaping circuit for the rotation angle signal from the magnetic rotation detector, and PX and Po are rotation angle signals, respectively. 103 is the rotational angular velocity W from the input shaft rotational angle signal PI
This is a rotational angular velocity detection circuit that obtains r.

However, the rotational angular velocity can also be obtained from the output shaft rotational angle input signal PO. In other words, the rotational speed and rotational angular velocity are obtained from the period of the rotational angle signal. 104 is a delay time integration circuit that measures the pulse time delay between the input shaft rotation angle signal PI and the output shaft rotation angle signal PO. The product of the rotation angular velocity and the delay time is the phase difference between the input shaft rotation angle and the output shaft rotation angle. This phase difference is equal to the rotation angle difference θE with respect to the transmitted torque T. Nao, 105 ha n device, 106 i
J: l-# This is a coefficient unit that converts the rotation angle difference θE to obtain the signal 'l'f.

FIG. 4 is a time chart of the torque calculation processing circuit when the number of teeth of the L input/output shaft gear is 4. From this figure (
a) and (b) show the rotation angle changes of the input shaft and output shaft, CC) and (d) are the rotation angle detection signals after waveform shaping processing, and the torque signal Tf can be obtained by the above torque calculation processing circuit. can. Note that the sampling period for torque detection is Ts in FIG. 4, and should not be shortened with the number of teeth of the input 1ull gear and the output shaft gear, and responsiveness can be improved by increasing the number of teeth. Also, calculate the pulse period, the rotational speed of the transmission shaft, the rotational angular velocity, and the delay time of the two pulses, obtain the rotational angle difference θE from the product of both, and calculate the generated torque signal Tf equivalent to the actual transmitted torque. The calculation to obtain U can be easily performed using a microgon viewer.

〔Effect of the invention〕

As described above, according to the present invention, a special structure such as a slip ring is not required, and therefore a torque detector having no structurally worn parts can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view and side view of a torque detector showing an embodiment of the present invention, Fig. 2 is a characteristic diagram of transmission shaft torque and transmission shaft rotation angle difference, and Fig. 3 is a block diagram of a torque calculation processing circuit. FIG. 4 is a time chart. ■...Input axis, 2...Output axis, 3...Detection axis, 4
...Input shaft gear, 5...Input shaft rotation detector, 6...
・Output shaft gear, 7...Output shaft rotation detector, 101, 1
02... Waveform shaping circuit, 103... Rotation angular velocity detection circuit, 104... Delay time integration circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.0 Agent: Masuo Oiwa

Claims (1)

[Claims] An input shaft connected to the output shaft of an automobile engine, an output shaft connected to a load driven by the engine, a detection shaft that generates a torsion angle due to torque transmission between the input shaft and the output shaft, and an input shaft. An input shaft rotation detector that detects the rotation angle of the shaft, an output shaft rotation detector that detects the rotation angle of the output shaft, and a torque calculation processing circuit that obtains a torque detection signal by obtaining the rotation angle difference between the input shaft and the output shaft. A torque detector for an automobile engine, characterized by comprising: