JP2736974B2 - Automotive test equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Industrial Application Field) The present invention relates to a test apparatus suitable for a functional test of an assembled vehicle.

(Prior art) In response to the various demands of automobiles, automobiles with anti-skid brakes and four-wheel drive mechanisms have been produced. Therefore, these functions and mechanisms have to be tested quickly and reliably. There is a need for a device.

In response to such a demand, for example, Japanese Unexamined Patent Publication No. 61-13131
And an automobile test apparatus as disclosed in Japanese Utility Model Laid-Open Publication No. 63-7345.

The former device is based on a conventionally used braking force test device, and performs a test of anti-skid brake by driving a drum roller receiving rotation of a vehicle tire with a motor. It was a test in a state where it was far from the state in which it was present, and it could not be said that it showed the performance of the anti-skid brake when installed in the car. In the latter device, when the brake of the vehicle under test is actuated, the performance evaluation is performed using the time during which the drum roller rotation speed changes within a certain range as a parameter. There is a problem that it is difficult to check whether the brake pad is actually operating or not and the reliability is poor.

(Problems to be Solved) The present invention has been made in view of such circumstances, and it is possible to reliably evaluate the operation and non-operation of the anti-skid brake system in a state close to the actual running state. It is to provide a new vehicle test device.

(Means for Solving the Problem) In order to solve such a problem, in the present invention,
A drum roller that independently and rotatably supports each wheel of the vehicle under test; and a drum roller that supports at least a wheel on which the anti-skid brake of the vehicle under test is mounted. An equivalent inertia weight attached to the drum roller via a torsion detecting shaft having a degree of twisting when the brake of the automobile under test is actuated in a rotating state of the roller, and a torsion of the torsion detecting shaft is detected. Shaft torsion detecting means, means for counting the number of extreme values of the signal from the detecting means, means for detecting the rotational speed of each of the drum rollers, and It is provided with a judging means for judging acceptability from the count value of the extreme value.

(Operation) The rotation speed of the wheels is increased, and then the transmission of the automobile is set to the neutral point to disconnect the connection between the engine and the wheels. When the foot brake is depressed, the brake unit of the vehicle is actuated to apply braking to the wheels, and at the same time, the drum rollers that are in frictional contact with it are decelerated. In this deceleration process, immediately before the brake is locked, the anti-skid system is activated, and the braking force is weakened only for a moment to avoid locking of the vehicle wheel under test. Although an equivalent inertia weight is attached to one end of the torsion detecting shaft, in the normal state, the shaft rotates at the same speed as the drum roller, so that the shaft does not twist. On the other hand, when the brake of the vehicle under test is actuated and the drum roller is decelerated while rotating in a steady state, the inertia force of the equivalent inertia roller acts to cause a twist in the shaft, and the strain gauge generates an electric signal. Will be converted. At this time, since the torsional force acting on the shaft matches the deceleration of the drum roller, it does not respond to a slow speed decrease, and on the contrary, a high level signal is applied to the instantaneous deceleration. Will be output. For this reason, intermittent deceleration that is repeated in a very short time and at a high speed by the anti-skid system,
It is surely converted into an electric signal. The pulse-like signal from the strain gauge generated as a result of the operation of the anti-skid system is stored in the storage together with the speed data. The determination unit reads the distortion signal recorded in the storage unit and operates the anti-skid system based on the extreme value of the distortion signal within a period required to generate a preset speed difference, that is, the number of peaks or bottoms of the waveform. Determine the number of times.

(Embodiment) Therefore, the details of the present invention will be described below based on an illustrated embodiment.

FIG. 1 shows an embodiment of the present invention, in which reference numerals 1, 1 'and 2, 2' denote lifting devices 3, 4 respectively.
A pair of automatically rotatable drum rollers disposed in front and rear parallel to each other, and are disposed at intervals corresponding to the vehicle width so as to correspond to the left and right wheels of the automobile. On the other hand, in the present embodiment, one of the drum rollers 1, 2 on the rear side is provided with a rotating shaft 5, which has a rigidity enough to cause twisting when a brake of the vehicle is operated in a rotating state of the drum roller, The equivalent inertia weights 7 and 8 are attached via a shaft 6, and a strain gauge A for detecting torsion is attached to the surface of the shaft 5 (6) as shown in FIG. Power is supplied and signals are taken out via a ring B, and an encoder C for detecting the number of rotations of the shaft is provided.
Is provided, and a measuring mechanism M for outputting an output signal to a control device described later via a lead wire E is provided. The rollers 1 ′ and 2 ′ disposed on the front wheel side can be connected and separated via a connecting mechanism 10. This coupling mechanism 10
Are clutches 12, 12 on the drum roller side of the connecting shaft 11.
The orthogonal rotation conversion mechanism 13 is provided at the center, and is connected to the shaft 34.

Reference numeral 15 denotes a base mounted movably in the axial direction of a base frame 16, which is configured to be movable by a feed screw 18 driven by a motor 17, and on the upper surface thereof, a mechanism similar to that described above is provided. Have been. That is, the drum rollers 21, 21 '
, 22 and 22 ′ are arranged in front and back parallel with respect to the lifting devices 23 and 24, and the drum rollers 21 and 22 located on the rear side
Are mounted with equivalent inertial weights 27, 28 via rotating shafts 25, 26 having rigidity such that twisting occurs when a vehicle brake is actuated in the rotating state of the drum rollers. Is provided with a measuring mechanism M similar to that shown in FIG.

The rollers 21 ′ and 22 ′ disposed on the front side can be connected and separated via a connecting mechanism 30 having the same configuration as the above-described connecting mechanism 10. The connection mechanism 30 is provided with clutches 32, 32 on the drum roller side of the connection shaft 31, and an orthogonal rotation conversion mechanism 33 at the center, and is connected to a shaft 34 that can be expanded and contracted by an expansion mechanism 34. The connecting shaft 34 is provided with a shaft connecting mechanism 36 so that the front-wheel drum rollers 1 ′ and 2 ′ and the rear-wheel drum rollers 21 ′ and 22 ′ can be separated from each other. In the drawing, reference numeral 38 denotes a smoke exhaust duct, and S denotes a vehicle detector for detecting whether or not the vehicle under test is at the test position.

FIG. 3 shows an embodiment of the above-described control device, which is divided into a control device main body 40, a display panel 50, and an operation board 60, and each device is connected by a cable.

The display panel 50 is installed at a position that is easy to see from the driver's seat of the vehicle when the vehicle under test is set on the drum roller. As shown in FIG.
1, vehicle type indicator light group 52, destination indicator light group 53, drive mechanism indicator light group 54, inspection target item pass / fail indicator light group 55, inspection speed indicator 56, vehicle speed indicator 57, anti-lock brake system A test preparation end lamp 58 and a display 59 indicating the operation status of the antilock brake for each wheel are provided.

The operation board 60 is installed at a position where it can be easily operated from the driver's seat of the vehicle under test, and as shown in FIG. 2B, a vehicle type selection button 61, a mode setting button 62, a printer 63 for printing out the measurement results, and A power switch 64 is provided.

The control circuit 40 (FIG. 3) provides all vehicle types selected by the operation board 60, basic data corresponding to the previous test items, for example, km / hour-mile / hour conversion coefficient, vehicle length by vehicle type,
A test item data storage unit 41 in which a connection mechanism connection form for each drive mechanism is stored, and a test data storage unit for temporarily storing data selected from the storage unit 41 by the operation board 60
62, a calculation unit 43 for calculating parameters necessary for the test item based on data from the measurement mechanism M, data from the storage unit, etc.
A judgment data storage unit 4 for temporarily storing reference data so that a pass / fail judgment selected from the data storage unit 41 by the operation board 60 is performed.
4, and a pass / fail determination unit for comparing the data in the arithmetic unit 43 with the data in the determination data storage unit 44 to determine the pass / fail of the test item.

Next, the operation of the device configured as described above will be described based on the flowchart shown in FIG.

The operator gets into the vehicle F to be inspected, moves to the inspection device, and positions the front wheels of the vehicle under test between the drum rollers on the front side. In this state, the operator operates the button 61 on the operation board from inside the vehicle to select the type of vehicle to be inspected. As a result, the selection result is displayed on the vehicle type indicator lamp group 52 on the display panel 50. Based on the vehicle length data selected by operating the button, the base 15 is moved by the motor 17 to a position corresponding to the vehicle type and the vehicle is damaged. The front and rear wheels W1, W2 of the test vehicle F are connected between the drum rollers 1, 1 ', between 2, 2', between 21, 21 ', and 22, 2
Then, the elevators 3, 4, 23 and 24 are lowered (FIG. 5). In this state, the inspection items are set by operating buttons such as two-wheel drive / 4-wheel drive and destination specifications.

At this stage, when the measurement start button is pressed, the set items are stored in the test data storage unit 42.

[Test Related to Speedometer] The drum rollers 1 ', 2'21'22' are set to the connected state by the clutches 12, 12, 32, 32 and the connecting mechanism. The operator operates the engine of the vehicle to be measured and transmits its power to the wheels. Thereby, the drum rollers 1, 1 ',
2,2 ', 21,21', 22,22 'start rotating by receiving power from the measured vehicle wheel. All drum rollers 1,1 ', 2,
Since 2 ', 21, 21', 22, 22 'are in a connected state, all the drum rollers rotate at the same speed.

In this state, when the rotational speed of the measured vehicle wheel is increased, a signal from the encoder C of the measuring mechanism M is input to the arithmetic unit and is converted into speed data. In this way, when the high-speed meter alarm set for the vehicle under test is activated, the button on the operation board 60, that is, the meter alarm button is operated. Thereby, the display data of the speedometer of the vehicle under test at the time of starting the meter alarm is held in the arithmetic unit 43, and the speed of the vehicle at the time of starting the meter alarm is displayed on the test speed display 56 in a hold state, At the same time, the pass / fail determination unit 45 determines whether or not it is within the set allowable error range, and stores it as determination data.

Next, the speed of the vehicle is gradually reduced by applying the engine brake, and the speed is set at a preset speed, for example, an hourly speed.
When 40 km / h is displayed on the meter of the vehicle, when the operator presses the calibration measurement start button on the operation board 60, the rotation speed of the drum roller based on the measurement signal from the measurement mechanism M, that is, the rotation speed of the vehicle under test, Speed is calculated and pass / fail judgment unit
At 45, it is determined whether the error is within the allowable error.

[Test of Drive Mechanism] At the stage when the test for the last speed value in the process of the speed test is completed, the connection mechanism connects the front-wheel drum rollers 1 ′, 2 ′ and the rear-wheel drum rollers 21 ′, 22 ′. The rotational speed difference between the front and rear wheels after a lapse of a predetermined time after the disconnection is determined.

If the vehicle under test is a two-wheel drive, it is determined that the vehicle passes if the speed difference is larger than the set range, and rejects if the speed difference is within the set range.

Also, in the case of four-wheel drive, if the rotational speed difference is within the set range, it is determined that the front and rear rear wheel connection joint of the vehicle under test is functioning normally and it is determined that it passes, exceeding the set range Is judged to be rejected.

As shown in the flowchart, in the case of a vehicle type capable of switching between four-wheel drive and two-wheel drive, a test similar to the test for the two-wheel drive mechanism is performed by separating the front and rear wheels after the four-wheel drive test. By doing so, a more reliable inspection can be performed.

[Inspection of anti-skid brake system] All the drum rollers 1 ', 2', 21 'and 22' are connected again by the clutches 12, 12, 32, 32 and the connecting mechanism, and the engine speed is increased in this state. The rotation speeds of the wheels and the drum rollers are increased to predetermined values. As a result, all wheels rotate at the same speed as in the case where the vehicle is traveling on a road surface.

Next, the transmission of the automobile is set to neutral to disconnect the engine from the wheels W, and all the drum rollers 1 ', 2', 21 ', 22' are operated by the clutches 12, 12, 32, 32 and the coupling mechanism. Is disconnected, and the wheel and the drum roller are freely rotated.

When all preparations are completed in this way, the display panel
The brake test preparation end light 58 of 50 is turned on, and an indication that the brake test is possible is performed. In this state, when the operator steps on the foot brake, the brake unit of the automobile is operated to apply braking to the wheels, and at the same time, the drum rollers 1, 1 'to 22, 22' which are in frictional contact therewith also decelerate. . When the brake of the vehicle under test comes just before locking during the deceleration process, the anti-skid system is activated to reduce the tightening force of the brake pad for a moment, thereby avoiding the locking of the vehicle wheel under test. This allows the wheels to
When the drum rollers 1, 1 ', 2, 2', 21, 21 ', 22, 22' rotate again due to the inertial force, the brake pads operate again to apply the braking force. Reduce the tightening force to avoid brake lock.
By repeating such a process, the rotation speeds of the wheels of the vehicle under test and the drum rollers 1, 1 'to 22, 22' are reduced.

By the way, although the equivalent inertia weights 7, 8, 27, 28 are attached to one end of the detection shafts 5, 6, 25, 26,
In the normal state, the equivalent inertia weights 7, 8, 27, 28 are rotating at the same speed as the drum rollers 1, 2, 21, 22, and therefore the shafts 5, 6, 25,
26 has no twist. On the other hand, when the brake of the vehicle under test is actuated and the drum rollers 1 to 22 'are decelerated while rotating in a steady state, the equivalent inertia rollers 7, 8, 27, 28
The inertia force acts on the torsion detecting shafts 5, 6, 25, and 26, and the torsion is detected and converted into an electric signal by the strain gauge A (FIG. 2). Needless to say, since the twisting force acting on the shafts 5, 6, 25, 26 coincides with the deceleration of the drum rollers 1 to 22 ', it does not respond to a gradual decrease in speed. Will output a high-level signal for the deceleration acting on.

For this reason, even if the anti-skid system is operated and deceleration is performed for an extremely short time, it is surely converted to an electric signal. The pulse-like distortion signal from the strain gauge A generated by the operation of the anti-skid system in this way (FIG. 7) is stored in the storage unit together with the speed data. When the rotation speed of the drum rollers 1 to 22 'decreases to a predetermined speed in this way, the determination unit reads out the distortion signal recorded in the storage unit, and sets the speed difference within a period required to generate a preset speed difference. Count the number of peaks P1, P2 ... or bottoms b1, b2 ... of the distortion signal, that is, the number of times the brake pad is opened and closed. The anti-skid pass light is turned on, and the reject light is turned on if:

By the way, in this measurement process, since each drum roller is freely rotated in an independent state, the braking operation when the vehicle is running by itself is relatively the same, and the time when the vehicle is running is relatively low. It is possible to obtain a test result under the same conditions as described above.

[Reverse Gear Test] The transmission of the vehicle under test is set in the reverse state to increase the engine speed. Upon receiving speed data from the measuring mechanism M on the driving wheel side, it is determined whether or not the speed data rises to a set value within a predetermined time. If the speed data rises, it is determined that the operation of the reverse gear is normal, and the speed does not rise. In this case, it is judged as reject.

[Comprehensive Judgment] At the stage where the inspection for all items is completed, if all the inspection items are passed, a pass lamp is displayed to notify the operator that the inspection is completed.

On the other hand, if any one of the inspection items is rejected, the rejection indicator lamp is turned on to request the operator to re-inspection. If the re-examination is not successful even if the re-inspection is performed a plurality of times for the failed item, the operator operates the forced end button to end the test, activates the brake lock of the drum roller to stop the roller, Also smoke exhaust duct,
The guide roller is lowered, and the elevating table is further raised to retreat the vehicle from the test table. As a result, a signal is output from the vehicle detector S, and the start permission lamp is turned on.

In the above-described embodiment, the twist is detected by attaching a strain gauge to the twist detection shaft.
For example, whether a code plate is attached at a fixed distance, or a code code is provided on the peripheral surface of the shaft to detect the relative displacement of each code code, or whether the shaft itself is made of a material having a magnetostrictive effect. If a member having a magnetostrictive effect is attached to the shaft and the distortion caused by the torsion is magnetically detected, the extraction of the distortion signal becomes non-contact and the structure can be simplified.

(Effects of the Invention) As described above, in the present invention, a drum roller for supporting each wheel of the vehicle under test independently and rotatably, and at least an anti-skid brake of the vehicle under test among the drum rollers are mounted. Equivalent inertia weight attached to the drum roller via a torsion detection shaft having such a degree that the torsion is generated when the brake of the vehicle under test is actuated in a rotating state of the drum roller on the drum roller supporting the wheel being driven. Shaft torsion detecting means for detecting the torsion of the torsion detecting shaft, means for counting the number of extreme values of the signal from the detecting means, means for detecting the rotational speed of each of the drum rollers, and rotation of the drum rollers. Since there is provided a determination means for determining whether or not the value is extreme based on the count value of the extreme value while the predetermined value decreases, the anti-skid brake of each wheel of the vehicle under test By converting the instantaneous deceleration of the drum roller due to the operation of the system into a torsion of the shaft, the operation state of the anti-skid brake that opens and closes at a high speed can be detected with high sensitivity, and the inspection can be performed with high reliability.

[Brief description of the drawings]

FIG. 1 is a plan view of an apparatus showing one embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing an embodiment of a detection mechanism, FIG. 3 is a block diagram showing an embodiment of a control device, FIGS. 4A and 4B are diagrams showing a display panel surface and an operation board of the control device, respectively. Fifth
FIG. 6 is a diagram showing a state when the vehicle under test is set in the inspection device. FIG. 6 is a flowchart showing the operation of the above device.
And FIG. 7 is a diagram showing an output at the time of inspection of the anti-skid system in the same device. 1,1'2,2 '... Drum roller 5,6 ... Torsion detection shaft 7,8 ... Equivalent inertia weight 10 ... Coupling mechanism 12 ... Clutch 21,21', 22,22 '... Drum roller 25, 26: Torsion detection shaft 27, 28: Equivalent inertia weight 30: Connection mechanism 32: Clutch 34: Front / rear wheel drum connection shaft 36: Front / rear wheel drum contact / separation connection mechanism 40: Control circuit, 50 Display panel 60 Operation board A Strain gauge C Encoder for detecting rotation speed

Claims (2)

(57) [Claims] 1. A drum roller that independently and rotatably supports each wheel of a vehicle under test, and a drum that supports at least one of the drum rollers on which an anti-skid brake of the vehicle under test is mounted. An equivalent inertial weight attached to the roller via a torsion detecting shaft having a rigidity sufficient to cause torsion when the brake of the vehicle under test is actuated while the drum roller is rotating; and Shaft torsion detecting means for detecting the torsion of the shaft, means for counting the number of extreme values of the signal from the detecting means, means for detecting the rotational speed of each of the drum rollers, An automobile test apparatus comprising: a determination unit configured to determine a pass or a failure based on a count value of the extreme value during a decrease in the value. 2. A coupling mechanism for connecting and disconnecting one of the drum rollers supporting the front wheel and the rear wheel of the vehicle under test, the drum roller being coaxial with each other, and a rotation speed of the drum roller supporting the front wheel and the rear wheel. Speed detectors for detecting
2. The vehicle test apparatus according to claim 1, further comprising means for judging a pass or fail from a difference in rotation speed between the two detectors.