JPH03570B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gear shift measuring device for an automatic transmission, particularly for an automatic transmission.
The present invention relates to a device for measuring a shift shock that occurs when switching a transmission from a P range to an R range or from an N range to a D range.

[Prior Art] With the spread of automatic vehicles today, it is necessary to adequately control the quality of the automatic transmissions installed in them. Various performance tests are conducted on the system.

Performance tests for such automatic transmissions include range switching tests to see if range switching is performed better than before, and speed shifting tests when the automatic transmission is driven in the D range. was being carried out.

[Problems to be Solved by the Invention] Generally speaking, in automatic vehicles, when starting or reversing the vehicle, the range is switched from P range to D range or from N range to R range while the brakes are applied. There are many things.

During such a range switching operation, the output rotating shaft of the automatic transmission is normally locked by the brake, so some percentage of the engine output during idling is transferred to the automatic transmission via the automatic transmission. The signal is transmitted to the output rotating shaft, giving the driver a feeling of gear shifting.

In particular, if such shift shock exceeds a certain level, the driver will feel uncomfortable every time the driver changes from the N range to the D range or from the P range to the R range.

However, despite this, no transmission shock measurement tests have been conducted on automatic transmissions, and even automatic transmissions with large transmission shocks can be installed in vehicles if they pass other performance tests. I had a problem with it.

[Object of the Invention] The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an automatic transmission that can accurately measure the speed change shock of an automatic transmission before it is installed in a vehicle. Chick・
An object of the present invention is to provide a transmission shift shock measuring device.

[Means for Solving the Problems] In order to achieve the above object, the present invention measures the shift shock that occurs when the automatic transmission is switched from P range to R range or from N range to D range. The device comprises a rotational drive means for rotating the automatic transmission by simulating an idling state of the engine, a locking means for locking the output side rotating shaft of the automatic transmission, and an automatic transmission. A torque measuring means for measuring the output torque of the output side rotating shaft of the transmission and an automatic transmission.
Range switching means for switching from the range to the R range or from the N range to the D range; and a shift shock calculating means for calculating the maximum value of the output torque measured by the torque measuring means when changing the range of the automatic transmission. It is characterized by including the following.

Here, the speed change shock calculation means includes:
The upper and lower torque values for automatic transmission judgment are set in advance, and it is determined whether the calculated maximum output torque value is within the range of the upper and lower limits. It is preferable to do this.

Further, the shift shock calculation means measures a delay time from when the range of the automatic transmission is changed until this output torque reaches a predetermined delay reference value, and calculates the delay time according to a preset pass/fail judgment value. It is preferable to determine whether or not the delay time is within the delay reference time.

[Function] The present invention has the above configuration, and its function will be explained next.

When measuring a transmission shock using the apparatus of the present invention, first the output rotating shaft of the automatic transmission to be measured is locked using a locking means, and then the automatic transmission is controlled using a rotational drive means. The input rotating shaft of the tick transmission is driven to rotate while simulating the idling state of the engine.

In this state, use the range switching means to switch the automatic transmission from P range to R range or from N range to D range, and at this time, the maximum output torque of the output side rotating shaft of the automatic transmission. is calculated as the shift shock value.

At this time, if you set the upper and lower torque limits in advance for pass/fail judgment of automatic transmission, it will be possible to judge whether the measured maximum output torque value is within the range of these upper and lower limits. By doing so, it becomes possible to perform pass/fail judgment for automatic transmission.

In addition to this, by measuring the delay time from the time of range switching mentioned above until the output torque of the automatic transmission reaches a predetermined delay reference value, the automatic transmission can be checked in good condition. P range to R
It is also possible to simultaneously determine whether switching to the range or from the N range to the D range is possible.

[Example] Next, a preferred example of the present invention will be described based on the drawings.

FIG. 1 shows a preferred embodiment of the gear shift shock measuring device of the present invention. In this embodiment, an automatic transmission 10, which is the target of gear shift shock measurement, has a differential gear on its output side rotating shaft. The so-called so-called gear in which the shear gear 12 is integrally fixed
Designed for FF cars.

The automatic transmission 10 is rotationally driven by a motor 14 as a rotational drive means, simulating the idling state of the engine, and the output side rotating shaft of the differential gear 12 is locked using a locking means 16. It is designed so that it can be locked if necessary.

In the embodiment, the locking means 16 includes a gearbox 18 connected to the output-side rotating shaft of the differential gear 12, a clutch 20 provided on the output shaft side of the gearbox, and a fixed shaft 22. Gearbox 18 through 20
By connecting the fixed shaft 22 and the fixed shaft 22, the output side rotation shaft of the differential gear 12 is locked.

Further, a torque meter 24 is provided on the output side rotating shaft of the differential gear 12 as a torque measuring means for measuring this output torque, and the measured torque is sent to the shift shock calculation means 28 via an amplifier 26. It is output for

Further, the mounting device of the embodiment is provided with a range switching means 30 for switching the range of the automatic transmission 10. Shift section 32
It consists of a switching motor 34 connected via a
By rotationally driving this motor 34, the automatic transmission 10 can be moved to a desired range, such as R range, P range, N range, D range.
The switch is operated to the range.

The set range of the automatic transmission 10 is detected by a rotary encoder 36 connected to the rotating shaft of the switching motor 34, and its detection output is outputted to the shift shock calculation circuit 28 via an amplifier 38. There is.

The characteristic feature of the present invention is that the output side rotation shaft of the automatic transmission 10 is locked,
The purpose of this measurement is to measure the shift shock that occurs when changing the range from P range to R range or from N range to D range while the input rotating shaft is being rotated to simulate the idling state of the engine. .

Therefore, the shift shock calculation circuit 28 of the present invention
is based on the output of the rotary encoder 36 inputted via the amplifier 26, as shown in FIG.
The automatic transmission 10 detects that the automatic transmission 10 has switched from the P range to the R range or from the N range to the D range. The maximum value τ _P of the output torque of the automatic transmission 10 at the time of range switching is calculated.

Here, this shift shock calculation circuit 28
In addition to calculating the maximum output torque value τ _P , as shown in Fig. 2,
A torque upper limit value τ _H and a lower limit value τ _L are set for pass/fail judgment of the transmission 10, and it is determined whether the calculated maximum output torque value τ _P is included within the set range τ _L to τ _H. It is preferable to form the device so as to make such a determination.

Furthermore, this shift shock calculation circuit 28
As shown in the figure, from the time of range switching of the automatic transmission 10, its output torque τ
The delay time τ _D until reaching a predetermined delay reference value τ _S is measured, and it is determined whether this delay time τ _D is within the preset delay reference time for pass/fail judgment. Preferably, it is formed to do so.

By doing this, according to the apparatus of this embodiment, the automatic transmission 1
0 installed in a vehicle and the range is switched from P range to R range or from N range to D range while stepping on the brake, the range switching will be smooth without causing discomfort to the driver and without any time delay. It becomes possible to satisfactorily determine whether or not the process is to be performed.

Incidentally, it is preferable that the shift shock calculation circuit 28 is formed using a microcomputer.

FIG. 3 shows a specific configuration of the shift shock calculating circuit 28, in which the detection output of the torque meter 12 is inputted to a sampling circuit 42 via an amplifier 26 and an A/D converter 40, and a shift shock calculation circuit 28 is shown. The signal output from the rotary encoder 36 of the switching means 30 is inputted via the amplifier 38 to the range switching detection circuit 44, where switching from the P range to the R range or from the N range to the D range is detected.

The sampling circuit 42 starts sampling the measured torque τ input via the A/D converter 40 at the same time as the range switching detection circuit 44 outputs the range switching detection signal.

This sampling operation is performed at 5 msec intervals as shown in FIG. 2 in synchronization with the clock pulse output from the oscillator 46, and the sampling signal is output to the maximum torque calculation circuit 50 and the delay time calculation circuit 60. .

The maximum torque calculation circuit 50 includes a delay circuit 5
2. First comparator 54 and peak detection circuit 5
6, the maximum output torque value τ _P of the automatic transmission 10 at the time of range switching is calculated.

That is, the sampling signal of the sampling circuit 42 is input to the first comparator 54 as is, and is also input to the first comparator 54 after being delayed by one pulse by the delay circuit 52 .

The first comparator 54 compares the current sampling signal input in this way with the previous sampling signal, and when the value of the current sampling signal falls below the value of the previous sampling signal, The detection signal is output to the peak detection circuit 56.

As described above, the peak detection circuit 56 receives the detection signal from the first comparator 54 at the same time.
The sampling output currently output from the sampling circuit 42 is held as the maximum output torque value τ _P , and the maximum output torque value τ _P is output to the determination circuit 70 and the display circuit 72.

As shown in FIG. 2, the determination circuit 70 has a torque upper limit value τ _H and a lower torque value τ _L set in advance for pass/fail determination of the automatic transmission 10, and is outputted from the peak detection circuit 56. It is determined whether the maximum output torque value τ _P is within the range between the upper limit value τ _H and the lower limit value τ _L , and the determination result is output to the display circuit 72 .

The display circuit 72 displays the maximum output torque value τ _P output from the peak detection circuit 56 and also displays the determination result output from the determination circuit 70.

Further, the delay time calculation circuit 60 has a second
It includes a comparator 62 and a counter 64, and includes a delay time τ _D until the output torque τ reaches a predetermined delay reference value τ _S when the range of the automatic transmission 10 is switched.
Perform the calculation.

That is, the second comparator 62 is inputted with a delay reference value τ _S that is set to a predetermined value, and when the sampling signal τ output from the sampling circuit 42 exceeds this delay reference value τ _S. A stop signal is output to the counter 64.

The counter 64 starts counting time at the same time as the range switching detection signal is output from the range switching detection circuit 44, and stops the counting operation at the same time as the stop signal is output from the second comparator 62, thereby calculating the delay time. Measure τ _D. Then, the measured value τ _D is outputted to the determination circuit 70 and the display circuit 72.

A delay reference time for pass/fail judgment is set in advance in the judgment circuit 70, and it judges whether or not the delay time τ _D output from the counter 64 is within this delay reference time, and then outputs the judgment result. The signal is output to the display circuit 72.

The display circuit 72 then displays the delay time τ _D output from the counter 64 together with this determination result.

As described above, according to this embodiment, before the automatic transmission 10 is actually installed in a vehicle, the state of the automatic transmission 10 with the engine running and the brakes applied is simulated. , at this time, the maximum output torque τ _P and delay time τ D that occur when the range of the automatic transmission 10 is switched from P range to R range or from N range to _D range satisfy predetermined reference values. It becomes possible to perform a good pass/fail judgment as to whether or not the condition is met.

FIG. 4 shows another embodiment of the maximum torque calculation circuit 50, and the circuit of this embodiment makes it possible to more accurately detect the maximum output torque value when switching ranges. It is something.

That is, the maximum torque calculation circuit 50 of the embodiment
includes a memory 58 for storing sampling signals outputted from the sampling circuit 42 up to at least 5 pulses earlier than the current one, and the peak detection circuit 56 includes a discriminating section 56a and a reading section 56.
It is formed from b.

The determining unit 56a then uses the first comparator 54.
When a detection signal indicating that the previous sampling signal is larger than the current sampling signal is outputted five times in succession, a readout command signal is outputted to the reading unit 56b.

When such a read command signal is output, the reading unit 56b reads out the sampling signal stored in the memory 58 five pulses ago as the output torque maximum value τ _P , and uses that value τ _P in the determination circuit 70 and display. Output to circuit 72.

In this way, in this embodiment, the maximum value of the output torque is detected when the sampling signal output from the sampling circuit 42 decreases five times in succession. Even if the output torque decreases to a maximum value, this value will not be mistakenly detected as the maximum output torque value, making it possible to accurately measure the gear shift shock.

In the embodiment shown in FIG. 1, the automatic transmission 10 to be measured is for a front-wheel drive vehicle. However, the present invention is not limited to this, and can be applied to other types of automatic transmissions. It is also possible to measure the gear shift shocks of automatic transmissions, for example, FR automatic transmissions.

[Effects of the Invention] As explained above, according to the present invention, before an automatic transmission is installed in a vehicle, it can be changed from P range to R range or N range.
It becomes possible to satisfactorily measure the shift shock that occurs when switching from range to D range.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a preferred embodiment of the automatic transmission gear shift measuring device according to the present invention, and FIG.
An explanatory diagram of the output torque generated when changing the range of the transmission. Fig. 3 is a block diagram showing the specific configuration of the gear shift shock calculation circuit section of the device shown in Fig. 1. Fig. 4 is shown in Fig. 3. FIG. 7 is a block diagram showing another embodiment of the maximum torque calculation circuit section of the circuit. 10... Automatic transmission, 14... Motor as rotational drive means, 16
... Lock means, 24 ... Torque meter as torque measuring means, 28 ... Speed change shock calculation circuit, 30 ... Range switching circuit, 50 ... Maximum torque calculation circuit, 60 ... Delay time calculation circuit, 7
0...Judgment circuit.

Claims (1)

[Claims] 1. A device for measuring the shift shock that occurs when an automatic transmission is switched from P range to R range or from N range to D range, which simulates the idling state of the engine. A rotational drive means for rotationally driving the automatic transmission, a locking means for locking an output side rotational shaft of the automatic transmission, and an output torque of the output side rotational shaft of the automatic transmission is measured. a torque measuring means for changing the range of the automatic transmission from the P range to the R range or from the N range to the D range; A speed change shock measuring device for an automatic transmission, comprising: a speed change shock calculation means for calculating a maximum value of output torque. 2. In the device according to claim 1, the gear shift shock calculating means presets an upper limit value and a lower torque value for determining whether the automatic transmission is pass/fail, and the calculated maximum output torque value is set in advance. A gear shift measuring device for an automatic transmission characterized by determining whether the shift shock is within the range of the upper limit value and the lower limit value. 3. In the device according to claim 1 or 2, the shift shock calculation means calculates the delay time from when the range of the automatic transmission is changed until the output torque reaches a predetermined delay reference value. What is claimed is: 1. A speed change measuring device for an automatic transmission, characterized in that it measures whether the delay time is within a preset delay reference time for pass/fail determination.