JP3651990B2 - Auxiliary torque detection system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system for detecting load torque of an auxiliary machine for an automobile engine, for example, a compressor for an air conditioner, a hydraulic pump for power steering, an alternator, a radiator cooling fan, and the like.
[0002]
[Prior art]
Conventionally, as a general method for detecting load torque, the amount of torque is detected by measuring the amount of distortion (twist) of the drive shaft.
[0003]
[Problems to be solved by the invention]
However, the following problems exist in the above-described conventional technology.
1. A strain gauge is used to measure the amount of strain, and the output characteristics greatly vary depending on how the strain gauge is attached. Therefore, the measurement value for a certain amount of torque is likely to vary, and the measurement accuracy is low.
2. Since the output signal (electrical signal) is taken out after the strain gauge is bonded to the rotating shaft literally rotating, it is necessary to use a slip ring or the like for the electric circuit that is energized to take out the signal. Yes, it reduces the reliability and durability of the system.
[0004]
The present invention has been made in view of the above-described problems, and an object of the present invention is to reduce the idle speed by using a sensor such as an acceleration sensor and to smoothly perform a shift change of an automatic transmission. Furthermore, the present invention is to provide a new auxiliary machine torque detection system that can add detection of lock of an air conditioner compressor and detection of power steering, and has high measurement accuracy, reliability, and durability.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, the means described in claim 1 can be employed.
According to this means, the torque fluctuation of the rotating drive source to swing the movable part of the auto tensioner through the belt. The output waveform of the sensor attached to the movable part of the auto tensioner is an output waveform that is synchronized with the fluctuation cycle of the rotary drive source. By measuring the amplitude of this output waveform, the amplitude of the output waveform of the sensor From the correlation between the amount and the load torque amount of the auxiliary machine, the load torque amount of the auxiliary machine can be calculated by the calculation means .
And the auxiliary machine torque detection system of this invention does not change an output characteristic by how to attach to an engine like a strain gauge . Further, since the electrical output of the sensor is not taken out from the rotating body, it is not necessary to use a slip ring or the like, so that high measurement accuracy, reliability, and durability can be obtained.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 3, in an engine 1 mounted on an automobile, a belt pulley for driving various auxiliary machines, for example, a refrigerant compressor pulley 2 of an air conditioner, a hydraulic pump pulley 3 of a power steering, an alternator, A number of auxiliary pulleys such as a power generation pulley 4 and a radiator cooling fan pulley 5 are arranged in a series of belts by a pulley 6 (generally speaking, a drive shaft pulley) of an engine crankshaft 30 as a power source. 7 are driven simultaneously. In some cases, an idler pulley is used to wrap a single belt 7 in a meandering manner on many pulleys. In the example of FIG. 3, the idler pulley 8 is used, and the tension of the belt 7 becomes a constant value. The automatic tensioner 9 that automatically adjusts in this way is also provided on the most loose side of the belt 7 with one idler pulley 10.
[0007]
As corresponding to the characteristics of the present invention, the embodiment shown in FIGS. 1 and 2 shows the mechanism of the auxiliary torque detection system using an auto intensifier ® Na 9. A movable housing 13 is swingably provided on the outer periphery of the fixed housing 11 of the auto tensioner 9, and the movable housing 13 and the fixed housing 11 are connected by a coil spring 12. When the movable housing 13 swings with respect to the fixed housing 11, the coil spring 12 receives a torsional force. The shaft 16 is supported by an arm 14 provided at one end of the movable housing 13, idler pulley 10 is rotatably mounted through a bearing. An acceleration sensor 17 is attached to the tip of an extension arm 15 that extends the arm 14. When the movable housing 13 in response to the tension of the belt 7 is swung on the fixed housing 11, the acceleration sensor 17 is also swung together with the arm 14, and outputs to the operation unit (not shown) detects an acceleration of swing Thus, the amplitude amount of the output waveform can be measured. Further, by extending the extension arm 15, so that the it is possible to increase the output of the acceleration sensor 17.
[0008]
Next, the operation of the embodiment of the present invention shown in FIGS. 1 and 2 will be described with reference to FIGS. In FIG. 3, when the crankshaft 30 of the engine 1 rotates, the refrigerant compressor pulley 2 of the air conditioner engaged with the crankshaft pulley 6 by a series of belts 7, the hydraulic pump pulley 3 of the power steering, An alternator, that is, a power generation pulley 4, a radiator cooling fan pulley 5, an idler pulley 8, an idler pulley 10 of an auto tensioner 9, and the like are rotationally driven all at once. The torque acting on the engine fluctuates mainly with the explosion of the engine 1. The engine torque fluctuation due to the explosion of the engine 1 causes the movable housing 13 of the auto tensioner 9 to swing through the belt 7, the idler pulley 10 and the arm 14. When the load torque of the auxiliary machine increases, the engine torque fluctuation increases, and the movable housing 13 of the auto tensioner 9 swings strongly.
[0009]
As described above, when the movable housing 13 is swung on the fixed housing 11, the acceleration sensor 17 attached to the distal end of the extension arm 15 of the auto-tensioner 9 detects the acceleration of the output waveform swings together with the arm 14. As shown in FIG. 4 , the output waveform of the acceleration by the acceleration sensor 17 is an output waveform synchronized with the explosion cycle of the engine. Then, the amplitude amount of the output waveform is measured by a calculation means (not shown ). Between this way the acceleration amplitude of which is measured by the accessory load torque amount, a certain correlation there Runode as shown in FIG. 5, the amplitude of the acceleration by the arithmetic means acceleration sensor 17 By measuring the amount, the auxiliary load torque amount can be calculated from the relationship shown in FIG.
[0010]
Further, instead of measuring the acceleration amplitude amount with the auto tensioner, the displacement amplitude amount or the velocity amplitude amount of the auto tensioner may be detected.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of an auxiliary machine torque detection system according to the present invention.
FIG. 2 is a cross-sectional view of the embodiment of FIG.
FIG. 3 is a front view showing the overall configuration of the embodiment.
FIG. 4 is a diagram showing the relationship between the acceleration of the auto tensioner and the engine explosion cycle.
FIG. 5 is a diagram showing the relationship between the acceleration amplitude amount of the auto tensioner and the auxiliary machine load torque.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Engine 2, 3, 4, 5 ... Auxiliary machine pulley 6 ... Crankshaft pulley 7 ... Belt 8 ... Idler pulley 9 ... Auto tensioner 10 ... Auto tensioner idler pulley 11 ... Fixed housing 12 ... Coil spring 13 ... Movable housing 14 ... arm 15 ... extension arm 16 ... idler pulley shaft 17 ... acceleration sensor 30 ... crankshaft

Claims (6)

A drive shaft pulley attached to a rotational drive source to drive a vehicle accessory;
An accessory pulley attached to at least one vehicle accessory;
At least one idler pulley;
A belt that is laid over the drive shaft pulley, auxiliary pulley, and idler pulley in common;
An auto tensioner for keeping the belt tension constant;
A sensor attached to a movable part of the auto tensioner ;
Further, an auxiliary machine torque detection system comprising: an arithmetic means for calculating the load torque amount of the auxiliary machine according to the correlation between the amplitude amount of the output waveform of the sensor and the load torque of the auxiliary machine. The auto tensioner includes a movable housing that is swingably provided on the outer periphery of the fixed housing, a coil spring that connects the movable housing and the fixed housing, an arm that is provided at one end of the movable housing , 2. The auxiliary machine torque detection system according to claim 1, comprising an idler pulley rotatably attached to a supported shaft, and a sensor provided at a tip of an extension arm obtained by extending the arm.   The accessory torque detection system according to claim 1, wherein the rotational drive source is an engine. The auxiliary machine torque detection system according to claim 1, wherein the sensor is an acceleration sensor. Auxiliary torque detection system of claim 1, wherein said sensor is a sensor for detecting the displacement amplitude of. The auxiliary machine torque detection system according to claim 1, wherein the sensor is a speed sensor.

Images