JP2004258004A - Testing process and system for engine starting belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method to measure the torque characteristic (the peak torque and starting time) at the time of engine starting with a starter sticking the strain gauge on the engine drive plate, and a testing method to evaluate the engine starting belt diverting the engine to a load device after measuring its torque characteristic by the above-mentioned method, as well as devices to realize the methods. <P>SOLUTION: The belt testing device 1 consists of the engine 2, the drive shaft 3, the belt device 5 for the engine auxiliary-machine drive, and the panel base 4 attached and used on it. As for the engine 2, the power system is separated from the drive plate 2b, the axle crankshaft 2c of the engine 2 and the axle of the crank pulley (C/R) 5c on the panel 4 are connected by the drive shaft 3, and the motor-generator (M/G) is equipped with the belt device 5 for the engine auxiliary-machine drive. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine start belt used for a hybrid vehicle or an engine idling stop vehicle that switches between an internal combustion engine and an electric motor for operation, and more particularly to a method and apparatus for testing an engine start belt used for starting an engine. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a method of starting an automobile engine is generally a method in which a drive plate that rotates integrally with a crankshaft is gear-driven by a starter.
[0003]
However, due to a recent shift to energy saving or a shift to a clean environment, the main power of the vehicle engine is being replaced by an electric motor, and even in a vehicle in which the main power is an internal combustion engine, the engine is started. At present, idling stop vehicles using a belt drive are being widely used.
[0004]
In other words, in order to minimize fossil fuel consumption, it is necessary to minimize the idling time of the engine.For this purpose, the engine is frequently stopped every time the vehicle stops, and then the engine is restarted. I have to do it. For this purpose, it is necessary to frequently start the engine. However, in the conventional method in which the engine is gear-driven by the starter, the gear meshing sound is unavoidable, which adversely affects a quiet environment.
[0005]
As a means for solving this problem, a motor generator (M) obtained by modifying an AC generator (ACG) which has been mounted on a belt device for driving an engine accessory and adding a new electric function to the AC generator (ACG) has been proposed. / G) is being generalized.
[0006]
That is, the conventional engine accessory driving belt device includes an AC generator (ACG) pulley, an air conditioner / compressor pulley (A / C), and a water pump pulley (C / R) around a crank (C / R) pulley which is a driving pulley. Auxiliary pulleys such as W / P) are arranged in a predetermined layout, and a crank (C / R) pulley drives these pulley groups simultaneously via a belt.
[0007]
On the other hand, the motor generator (M / G) obtains the rotational force (engine output) of the crank (C / R) pulley to exhibit the original battery charging function of the AC generator (ACG) and is newly added. The engine is started via the belt by the electric function.
[0008]
As described above, in an idling stop vehicle or a hybrid vehicle that runs with an electric motor during low-speed running (idle rotation range) and runs with an engine during high-speed running (medium-high speed range), an engine accessory drive belt is used. The mounting of a motor generator (M / G) on a device is generalized.
[0009]
The motor / generator (M / G) starts the engine via a belt. The belt used for starting the engine is defined as an engine starting belt. However, the belt for starting the engine is different from the belt for driving the engine auxiliary equipment, and the starting torque applied to the belt is extremely large.
[0010]
That is, in addition to the conventional engine auxiliary equipment load, a significantly large engine starting torque is applied to the engine starting belt, and especially, the inertia torque due to the engine inertia becomes significantly large. .
[0011]
By the way, the conventional belt testing method includes firstly a constant torque (mainly friction torque) load test method for simulating constant speed running of the vehicle, and secondly, a varying torque (simulating the acceleration / deceleration running of the vehicle). There is a load test method based on inertia torque).
[0012]
The first method is a method of connecting a load device represented by an eddy current brake or an electric dynamometer to a load shaft of a belt test device, for example, and simulating a predetermined friction torque.
In the second method, for example, a predetermined flywheel is mounted on a load shaft of a belt tester, an induction motor or a servomotor is connected to a drive shaft, and the rotation of the motor is controlled, thereby obtaining a predetermined inertia torque. Is a method of simulating
[0013]
Here, as a belt test method according to the present invention, a test method for simulating an inertia torque will be exemplified below. (See Patent Document 1)
[Patent Document 1]
Japanese Patent Application No. 2001-363963 Also, an installation type torque measuring device for measuring the torque of an engine according to the present invention will be exemplified below. (See Patent Document 2)
[Patent Document 2]
JP-A-6-74950
[Problems to be solved by the invention]
However, in the first method, in order to generate a desired inertia torque, the inertia of the flywheel is determined in advance by calculation, and the flywheel is appropriately assembled, the starting torque waveform is measured, and a complicated procedure is tried. I needed to make a mistake.
[0015]
In addition, this method is relatively easy to simulate when most of the starting torque is inertial torque due to inertia, but the engine starting belt according to the present invention includes an In addition to the resulting inertia torque, the piston compression force, friction loss, and the like act in a complicated manner, so it is necessary to simulate the engine-specific starting torque in parallel with the inertia torque simulation.
[0016]
The second method can simulate desired fluctuation torque (up-down load), but it is generally difficult to simulate fluctuation torque in a minimum time (rotation cycle level). It is. Therefore, the present inventor has invented a new belt test method and apparatus that accurately simulates engine start according to actual machine conditions by converting a general-purpose engine to a load device of a belt test apparatus.
[0017]
[Means for Solving the Problems]
According to a first aspect of the present invention, in the method for testing a belt for starting an engine, a starting torque waveform of a predetermined engine is measured, and a torque characteristic is determined from the measured waveform. This is a test method of an engine start belt that is connected to a load shaft and starts an engine by starting a motor generator (M / G) mounted on a belt layout.
[0018]
The invention according to claim 2 is the method for testing an engine start belt according to claim 1, wherein the measurement of the starting torque waveform is performed by attaching a strain gauge to an engine drive plate.
[0019]
According to a third aspect of the present invention, in the method for determining a torque characteristic from a starting torque waveform, the engine is started with the starter of the engine, and the peak torque and the starting time are determined based on the measured starting torque waveform. It is a test method of the engine start belt described in the above.
[0020]
The invention according to claim 4 is the method for testing an engine start belt according to any one of claims 1 to 3, wherein the engine start belt is an engine start belt mounted on a hybrid engine or an idling stop engine. .
[0021]
According to a fifth aspect of the present invention, there is provided a test apparatus for an engine start belt. A belt unit for mounting the engine accessory drive belt device thereon, and a drive shaft connecting an output shaft of the engine and a crank pulley shaft of the engine accessory drive belt device. This is a test device for the configured engine start belt.
[0022]
The invention according to claim 6 is the test device for an engine start belt according to claim 5, wherein the engine accessory driving belt device is an engine accessory driving belt device mounted on a hybrid engine or an idling stop engine. .
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a belt test apparatus according to an embodiment, wherein FIG. 1A shows a plan view, and FIG. 1B shows a left side view of FIG. 1A. 2A and 2B are views showing a drive plate according to the embodiment. FIG. 2A is a front view, and FIG. 2B is a sectional view taken along the line AA of FIG. 2A. FIG. 3 is a photograph showing a drive plate according to the embodiment.
[0024]
FIG. 4 is a graph showing a starting torque waveform according to the embodiment, FIG. 5 is a schematic diagram showing a layout of an engine starting belt according to the embodiment, and FIG. 6 is a diagram showing an idling stop vehicle according to the present invention. It is a schematic diagram showing an example.
[0025]
First, an outline of an engine start belt characteristic of an idling stop vehicle or a hybrid vehicle will be described in detail with reference to FIG. FIG. 6 is a schematic view showing an example of the idling stop vehicle. As shown in FIG. 6, a motor generator (M / G) is mounted on the engine accessory driving belt device 5 of the engine 2.
[0026]
Restarting the engine from idling stop is a procedure in which the motor / generator (M / G) starts first, then the engine start belt 5b starts, and finally the engine 2 starts.
[0027]
Normally, the starter 2a shown in FIG. 6 starts the engine by gear engagement only at the time of the first ignition start. However, in the subsequent restart of the engine accompanying idling operation, the engine start belt 5b performs its function. Fulfill.
[0028]
Therefore, since the motor / generator (M / G) is not mounted on the auxiliary device driving belt device 5 of the conventional vehicle, the engine is restarted from the idling stop by the gear engagement by the starter 2a shown in FIG. The engine starts.
[0029]
As a method of frequently starting and stopping the engine 2 in response to the idling stop running, there is a conventional gear meshing method using a starter 2a. As described above, this method has a disadvantage of generating gear noise and a gear meshing portion. However, there is a disadvantage that the wear of the steel is accelerated, and an alternative technique is required.
[0030]
As an alternative to this, power has been supplied to engine accessories such as a water pump (W / P), an air conditioner pump (A / C), a power steering hydraulic pump (P / S), and an AC generator (ACG). Has been disclosed which utilizes the belt device 5 for driving the engine auxiliary equipment, which has transmitted the information.
[0031]
This method adds a new motor function to an AC generator (ACG) for charging a battery, reconfigures it as a motor generator (M / G), drives a belt with the motor generator (M / G), 2 is a method of starting.
[0032]
That is, the conventional engine accessory driving belt device 5 drives only the engine accessories, but as shown in FIG. 5, the engine accessory driving belt device 5 used in the idling stop vehicle includes: In addition to the conventional engine accessories, an accessory for starting the engine 2, that is, a motor generator (M / G) is assembled.
[0033]
Inertia torque due to inertia of a piston, a connecting rod, a drive plate, and the like is applied to the crankshaft of the engine, and frictional losses such as a piston mechanism and a valve train cam mechanism are added. For this reason, a remarkably large starting torque acts on the engine starting belt 5b as compared with the related art.
[0034]
Next, an embodiment of a method and a device for testing an engine start belt 5b according to the present invention will be described in detail with reference to FIGS. 1 (a) and 1 (b). In FIG. 1A, a belt test apparatus 1 includes an engine 2, an engine accessory driving belt device 5, a panel base 4 on which the engine accessory driving belt device 5 is mounted, and a crankshaft of the engine 2. 2c and a drive shaft 3 for connecting the shaft of a crank pulley (C / R) 5c of the belt device 5 for driving the engine accessory.
[0035]
As the engine 2, a general-purpose engine whose starting torque waveform is measured in advance is used, but this engine 2 functions as a load device and does not have a function as a prime mover. However, depending on the purpose of the test, use as a prime mover is optional.
[0036]
Since the engine start belt 5b used in the idling stop engine is characterized in that the start torque acts on the belt repeatedly, it is necessary to accurately measure the start torque waveform in the first place. .
[0037]
In this method, as shown in FIGS. 2 (a) and 2 (b), the shape of the rib wheel for optimizing the strain sensitivity is designed in advance by FEM analysis, and based on the result, the inner disk of the actual drive plate 2b Machine the part. This is a method in which a predetermined number of strain gauges are attached to the side surface of the rib portion of the drive plate 2b created in this way, and used as a torque sensor. According to this method, measurement can be performed in an actual machine mode, and accurate torque characteristics can be obtained.
[0038]
The engine start belt 5b used in the engine accessory driving belt device 5 is usually a V-ribbed belt having excellent flexibility. The V-ribbed belt has a cord made of a stretched cord, an adhesive rubber for embedding the cord, an extension rubber having a rubber canvas laminated on an upper side thereof, and a predetermined number of ribs on the lower side in a belt longitudinal direction. And the rib rubber formed in the above.
[0039]
As described above, since the method for measuring the starting torque waveform of the engine 2 according to the present invention is a method for starting the drive plate 2b by the starter 2a, the inertia condition is the same as that of the actual machine, and the starting torque waveform is faithfully reproduced. . In contrast, the known technique disclosed in Japanese Utility Model Laid-Open No. 6-74950 has different inertia conditions (including the inertia of the electric motor and other transmission mechanisms) from the actual machine, and thus it is difficult to obtain an accurate starting torque waveform. .
[0040]
【Example】
Hereinafter, examples according to the present invention will be described. In order to evaluate the performance of the engine start belt 5b, an in-line four-cylinder DOHC 2000cc engine was used as a load device. In order to measure the starting torque waveform of this in-line four-cylinder engine, the drive plate 2b (ductile cast iron) of the engine 2 is processed into a predetermined shape, and the drive plate 2b on which a strain gauge is attached is mounted on the drive plate 2b. Used as
[0041]
In order to optimize the strain sensitivity of the strain gauge, the optimum rib wheel shape shown in FIGS. 2A and 2B is calculated in advance by FEM analysis, and based on this, the inside of the drive plate 2b is determined. The peripheral disk portion was machine-cut to form the illustrated rib wheel shape.
[0042]
Kyowa Dengyo strain gauges KFG-6-120 having a length of 6 mm were attached to both sides of the rib portion of the drive plate 2b at two diagonal positions as shown in the figure to form a Wheatstone bridge. Above, a starting torque waveform was measured using a dynamic strain meter and an XY recorder (not shown).
[0043]
As shown in FIG. 4, the time series measurement of the starting torque waveform in consideration of the engine-specific load torque including the inertia, piston compression force, friction loss, and the like of the actual engine became possible. This makes it possible to determine the torque characteristics (peak torque and starting time) according to the actual machine.
[0044]
By assembling the general-purpose engine 2 having accurately determined the torque characteristics at the time of starting the engine as a load device on the load shaft of the belt test device 1, a simulation of the belt device 5 for driving an engine accessory having an engine start function is performed. Enabled.
[0045]
The panel base 4 shown in FIG. 1A is a steel mounting base formed of a substantially rectangular parallelepiped, and a predetermined number of through holes or screw holes are formed on the mounting surface at a predetermined pitch in the thickness direction. This makes it easier to mount accessories on the panel surface.
[0046]
Since the panel base 4 has the convenience of easily assembling various accessories, it is possible to freely cope with various belt layouts required as test objects. FIG. 1B is a belt layout diagram according to the embodiment, in which a shaft of a crank pulley (C / R) 5 c and a crank shaft 2 c of the engine 2 are connected by a drive shaft 3.
[0047]
By starting the motor generator (M / G) under this configuration and further rotating the motor generator (M / G) pulley 5a, the air conditioner compressor (A / C), the water pump (W / P) , The power steering pump (P / S) and the engine 2 are started.
[0048]
As shown in FIG. 1A, in the engine 2, the power system after the drive plate 2b is cut off so that the start condition by the starter 2a is the same. At this time, the engine start belt 5b used for the test was a V-ribbed belt 6PK1800 manufactured by Mitsuboshi Belting Co., Ltd.
[0049]
As described above, the belt test apparatus 1 according to the present invention is characterized in that an engine normally used as a prime mover is used as a load device, and the torque characteristics (peak torque and starting time) of the engine 2 Only by making an accurate determination can the engine 2 be diverted to a load device.
[0050]
【The invention's effect】
According to the first aspect of the present invention, it becomes possible to evaluate the engine start belt used in the engine accessory driving belt device.
[0051]
According to the second and third aspects of the present invention, it becomes possible to accurately and easily determine the starting torque characteristic of the engine provided to the load device.
[0052]
According to the fourth aspect of the present invention, it becomes possible to evaluate an engine start belt mounted on a hybrid engine or an idling stop engine.
[0053]
According to the fifth aspect of the present invention, it becomes possible to simulate an engine accessory driving belt device having an engine starting belt.
[0054]
According to the sixth aspect of the present invention, it is possible to simulate a belt device for driving an engine accessory having a belt for starting an engine mounted on a hybrid engine or an idling stop engine.
[Brief description of the drawings]
FIG. 1 is a view showing a belt test apparatus according to an embodiment, FIG. 1 (a) shows a plan view, and FIG. 1 (b) shows a left side view of FIG. 1 (a).
FIG. 2 is a view showing a drive plate according to the embodiment, FIG. 2 (a) is a front view, and FIG. 2 (b) is a sectional view taken along the line AA of FIG. 2 (a). Show.
FIG. 3 is a photograph showing a drive plate according to the embodiment.
FIG. 4 is a graph showing a starting torque waveform according to the embodiment.
FIG. 5 is a schematic view showing a layout of an engine start belt according to the embodiment.
FIG. 6 is a schematic view showing an example of an idling stop vehicle according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Belt test apparatus 2 Engine 2a Starter 2b Drive plate 2c Crank shaft 3 Drive shaft 4 Panel stand 5 Engine drive belt device 5a Motor generator pulley 5b Engine start belt 5c Crank pulley (C / R)

Claims (6)

In the test method of the engine start belt,
The starting torque waveform of a predetermined engine is measured, the torque characteristic is determined from the measured waveform, the engine having the known torque characteristic is connected to the load shaft of the belt test device, and the motor / generator attached to the belt layout. A method for testing an engine start belt, wherein the engine is started by starting (M / G). The method for testing an engine starting belt according to claim 1, wherein the measurement of the starting torque waveform is performed by attaching a strain gauge to an engine drive plate. The engine start belt according to claim 1 or 2, wherein the method of determining the torque characteristics from the start torque waveform starts the engine with a starter of the engine, and determines the peak torque and the start time based on the measured start torque waveform. Test method. The method for testing an engine start belt according to any one of claims 1 to 3, wherein the engine start belt is an engine start belt mounted on a hybrid engine or an idling stop engine. In the test device for the engine start belt,
A predetermined engine whose torque characteristics at the time of engine start are known in advance;
A belt device for driving an engine auxiliary machine in which a motor generator (M / G) is arranged in a belt layout;
A panel base on which the engine accessory drive belt device is mounted,
A drive shaft connecting an output shaft of the engine and a crank pulley shaft of the engine accessory driving belt device,
An engine start belt testing device, comprising: The engine starting belt testing device according to claim 5, wherein the engine accessory driving belt device is an engine accessory driving belt device mounted on a hybrid engine or an idling stop engine.

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