JPH0377045A - Trouble inspection instrument for clutch and gear driving system of automatic transmission - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a failure inspection device for a clutch and gear drive system of an automatic transmission, and more specifically, an electromagnetic inspection device for operating a clutch control cylinder or a gear switching cylinder. Failure inspection to detect failures in valves or their hydraulic circuits'vR
It's about location.

[Prior Art] Conventionally, automatic transmissions have been configured to automatically switch gear positions using a gear switching cylinder, and to automatically engage and disengage a dry single-plate clutch using a clutch control cylinder during the gear switching operation. There is. The hydraulic oil supplied to each cylinder is controlled by a solenoid valve, and each solenoid valve is driven and controlled by a controller.

Further, when performing a product test of the automatic transmission described above, each electromagnetic valve is sequentially operated one by one by the controller, and the operating status of the valves is observed to determine whether or not there is a failure.

[Problems to be Solved by the Invention] However, the above-described failure determination method simply checks the operation of each solenoid valve one by one.
Only the quality of the solenoid valve itself can be determined. Therefore, for example, when the vehicle is actually running, the controller does not drive and control each electromagnetic valve in the normal operating order, and the clutch control and gear switching cylinders malfunction, resulting in an inability to engage or disconnect the clutch or to change gears. There is a possibility. In addition, since each solenoid valve is not operated at the same time when determining a failure,
If all solenoid valves operate at the same time in the normal operating order during actual driving, the power supplied to the solenoid valves may be insufficient, or due to wiring errors, individual solenoid valves may operate normally but not at the same time. be.

An object of the present invention is to provide a failure inspection device for a clutch and gear drive system of an automatic transmission that can reliably discover all kinds of failures, including those that occur during actual driving.

[Means for Solving the Problems] The present invention provides a gear switching cylinder that switches the gear position of a transmission, a gear switching solenoid valve that controls hydraulic oil supplied to the gear switching cylinder, and a gear switching cylinder that switches the gear position of a transmission. In an automatic transmission equipped with a clutch control cylinder that connects and disconnects the clutch when switching gears by the clutch I control cylinder, and a clutch control solenoid valve that controls hydraulic oil supplied to the clutch I control cylinder, the engine of the vehicle is stopped. An inspection program for driving and controlling the gear switching solenoid valve and the clutch control solenoid valve in order to operate the gear switching cylinder and the clutch control cylinder in accordance with the actual driving of the vehicle while the gear switching cylinder and the clutch control solenoid valve are in operation. An automatic transmission comprising a stored storage means, and an inspection control means for reading an inspection program stored in the storage means and driving and controlling the gear switching solenoid valve and the clutch υ [regular solenoid valve] according to the program. The gist of this article is a failure inspection device for clutch and gear drive systems.

[Operation] Based on the operational status of the gear switching cylinder and the clutch control cylinder, it is determined whether there is a failure in the solenoid valve or hydraulic oil supply unit that controls each cylinder. At this time, each solenoid valve operates each cylinder in accordance with the actual driving of the vehicle, so various failures occur in each solenoid valve and hydraulic oil supply section that occur during actual driving, and these failures are inspected. can do.

[Example] Hereinafter, an example in which the present invention is embodied in a forklift equipped with an automatic transmission will be described with reference to the drawings.

Figure 1 shows the mechanism and electrical configuration of a forklift drive system. The output of an engine 1 is transmitted to an automatic transmission 3 via a dry single-plate clutch 2, which automatically changes gears! II3 drives the running drive wheels 5 forward and backward at a predetermined gear ratio via the differential gear mechanism 4.

FIG. 2 shows a hydraulic circuit of a forklift, and this hydraulic circuit includes a gear switching unit 6 that switches the gear position of the automatic transmission 3, a clutch control unit 7 that connects and disconnects the dry single-plate clutch 2, and both. 6.7 and a hydraulic oil supply section 8 for supplying hydraulic oil. This hydraulic circuit will be explained below. A hydraulic oil supply section 8 supplies hydraulic oil stored in an oil tank 9 to an oil pump 1 driven by a motor 10.
It is designed to pump water at 1. The pumped up hydraulic oil is supplied to the gear switching section 6 and the clutch control section 7 via the relief valve 12, check valve 13, accumulator 14, and pressure switch 15.

The gear switching section 6 switches the gear position of the automatic transmission t113 between 1 speed (fast) and 2nd speed (low speed) by driving the speed change cylinder 16, and also switches the gear position of the automatic speed change t113 between 1 speed (fast) and 2 speed (low speed).
The gear position can be switched between forward and reverse at . Hydraulic oil from the hydraulic oil supply section 8 is supplied to both cylinders 16, 17 via a normally closed main solenoid valve 18.

A normally open first speed switching solenoid valve 19 and a normally open second speed switching solenoid valve 20 are connected to the speed changing cylinder 16, and the first speed switching solenoid valve 19 closes and becomes a second speed switching solenoid valve. 20
When the piston 16a of the cylinder 16 opens, the piston 16a of the cylinder 16 moves forward (first
(to the right in the figure) and switch the automatic transmission 3 to 1st speed. Conversely, when the first speed switching solenoid valve 19 opens and the second speed switching solenoid valve 20 closes, the piston 16a moves rearward (to the left in FIG. 1) and switches the automatic transmission 3 to the second speed.

Further, the normally open reverse switching solenoid valve 21 and the normally open forward switching solenoid valve 22 are connected to the forward/reverse switching cylinder 17, and the reverse switching solenoid valve 21 is closed and the forward switching solenoid valve 2 is closed.
2 opens, the piston 17a of the cylinder 17 moves forward and switches the automatic transmission 3 to reverse. Conversely, when the reverse switching solenoid valve 21 opens and the forward switching solenoid valve 22 closes,
The piston 17a moves rearward and switches the automatic transmission 3 to forward movement.

Incidentally, the gear switching cylinder 16 and the forward/reverse switching cylinder 17 constitute a gear switching cylinder, and the main solenoid valve 18, first speed switching solenoid valve 19, and second speed switching solenoid valve 19, 20
．． The forward switching and reverse switching solenoid valves 22 and 21 constitute a gear switching solenoid valve.

The clutch control section 7 is adapted to engage and disengage the dry single plate clutch 2 by driving the clutch control cylinder 23. The hydraulic oil from the hydraulic oil supply section 8 is supplied to the cylinder 23 through either one of normally closed high-speed and low-speed off-direction solenoid valves 24, 25 connected in parallel.

Restrictions 24a and 2 provided in the paths of both electromagnetic valves 24 and 25
The diameter of the throttle 5a is set wider at the throttle 24a on the side of the high-speed cutting direction solenoid valve 24. In addition, the clutch control cylinder 23
The hydraulic oil supplied to the hydraulic oil supply section 8 is collected into the oil tank 9 of the hydraulic oil supply section 8 through either one of normally closed high-speed and low-speed directional solenoid valves 26 and 27 connected in parallel.

Restrictions 26a and 2 provided in the paths of both electromagnetic valves 26 and 27
The diameter of the throttle 7a on the high-speed tangential solenoid valve 26 side is set to be wider.

The high-speed and low-speed directional solenoid valves 24 and 25 and the high-speed and low-speed directional solenoid valves 26 and 27 constitute a clutch control solenoid valve.

Then, when only the high-speed disconnection solenoid valve 24 among the four solenoid valves 24 to 27 opens, the hydraulic oil is rapidly supplied to the clutch control cylinder 23 through the large-diameter throttle 24a, and the dry single-plate clutch 2 is activated. be cut off promptly. Further, when only the low-speed disconnection direction solenoid valve 25 is opened, the hydraulic oil is slowly supplied to the clutch drive cylinder 23 while being restricted by the small-diameter throttle 25a, and the clutch is gradually disengaged. Conversely, when only the high-speed tangential solenoid valve 26 of the four solenoid valves 24 to 27 opens, the hydraulic oil is rapidly collected from the clutch control cylinder 23 into the oil tank 9 through the large-diameter throttle 26a. Clutch 2 is quickly connected. Further, when only the low-speed disconnection direction solenoid valve 27 is opened, the hydraulic oil is slowly collected into the oil tank 9 while being restricted by the small-diameter throttle 27a, and the clutch 2 is gently connected.

It should be noted that the forklift truck is equipped with a hydraulic circuit for cargo handling, although the details will not be described in addition to the hydraulic circuit for gear switching and clutch I control described above.

On the other hand, to explain the electrical configuration of the forklift of this embodiment, the stroke detection sensor 28 in FIG. 1 is composed of a potentiometer, and the clutch control cylinder 2
The stroke amount of the O-rad 23a of No. 3 is detected, and the detection signal is converted into a digital signal by the A/D converter 29 and output to the input/output interface 30. Vehicle speed sensor 3
1 detects the rotational speed of the output shaft 3a of the automatic transmission 3, and sends the detection signal to the input/output interface 3.
Output to 0. The input shaft rotation speed sensor 32 detects the rotation speed of the input shaft 3 b of the automatic transmission 3 and outputs the detection signal to the input/output interface 30 .

Moreover, the accelerator sensor 33 consists of a potentiometer,
The amount of depression of an accelerator pedal 34 provided at the driver's seat is detected, and the detected signal is digitally converted by an A/D converter 35 and outputted to the input/output ink 30. The lever position detection hinge 36 in this embodiment C consists of a plurality of limit points and 1' points, and is installed in the driver's seat.
Detects the υJ change of the forward/reverse operation lever 37 that has been moved, and outputs a detection signal of ``Z''.
to appear on the street.

Central processing unit of inspection control means 4hi(): 38 (hereinafter referred to as
CP (,, i) is Ut input/output internoe 1
7-(detection signals from each of the above-mentioned sensors are detected through (According to the 1llIJ Go 1st Gram that was memorized on July 39th)
'T, it's working.

Note that the working memory 40 can be read and rewritten.
CP LJ 38 (D Rn results are now stored temporarily8.

Soshi-(, CPU 38 Ha7 Kuhirbegur 34 (
7) Change the rotation speed of engine 1 according to the pedal pressure.

Further, the CPU 38 receives the E through the drive enclosure 41 during driving.
The switching valve 18 and the electromagnetic foot t19, 20 for switching between 1st and 2nd speeds are driven and controlled 1, and when the accelerator pedals 2 and 4 are depressed for heavy speeds, the C-shift switching cylinder 16 switches the output transmission 3. 1'1 position Xun 1st speed,? In addition, the CPU 38 and the valve position detection sensor 36 detect the switching state of the reverse operation lever 37. , in its switching state r6 (through the drive enclosure 41, the main switching valve 18.!: forward and reverse switching solenoid valve 22.2'1k
The gear position of the outgoing transmission 3σ) is switched between forward and reverse by means of the forward/backward switching cylinder 17.

Furthermore, the CPU 38 drives and controls the clutch control hash cylinder 23 and the valley solenoid valves 24 to 27 through the drive enclosure 42 when changing the gear position or starting the 7-wheel drive 71, etc. Sirin I for ill i&ll! '23: Turn clutch 2 on and off.

-7N, lff1 write block (j Genome memory 39 has an inspection program for energizing a solenoid valves 123 to 22. is memorized, and the detection signals from each sensor meet the predetermined conditions, and each solenoid valve 10-22.24 is
~ 27 is driven and controlled and the inspection shade is executed.
Is this inspection mode used before the shipment of 7 Oak Cliff 1~? ]”,
'; This is for product testing, and the inspection right is for each solenoid valve 18-22.2 that can be executed in each step.
4-27 and the operating status of cylinders 16, 17, and 23 are memorized in advance, and the specified operation is always performed smoothly. If a cylinder that is supposed to operate does not actually operate, that cylinder It has been determined that the solenoid valves and oil valves that cause the engine to operate have become obsolete. Below, 6 of this inspection mode
3. In order for the CPU 38 to enter the inspection IF mode written in was not operated and the specified connector that was fully connected to the CPU 38 was disconnected.
In addition, after the connector is removed, the forward/reverse operation lever 37 must be operated back and forth three times in a predetermined period of time, and when this condition is satisfied, the inspection mode is executed. As mentioned above, in this embodiment, the inspection card is composed of 10 steps C, and the CI] U 38 performs processing from 1 snap to 10 switches for each step (1 step C).
Repeat every second.

Hereinafter, this process will be explained according to FIG. 3.4. 3 Hisashi,
In Figure 3, the solenoid valves marked with a circle (○) are in the energized state.

First, in step 1, the CPU 38 energizes only the high-speed and low-speed contact electromagnetic clutches ↑26 and 27.
is connected, the first and second gears of the output transmission 3 are switched to first gear, and the forward and reverse gears are switched to forward gear. Soshir, CP
U38 & step 2'c'' energizes only the low-speed disconnection direction solenoid valve 25. As a result, the solenoid valve 25 opens the clutch l[ilJ. y-2 is cut gently (a in Figure 4)
...6 hours). In step 3, CPU38 & main solenoid valve 1
8. Reverse switching solenoid valve 2' 1. Only the 1st and 2nd speed switching solenoid valves 19 and 20 are energized. Since the main solenoid valve 18 is closed and the solenoid valves 21, 19, and 20 are closed, hydraulic oil is introduced into the forward/reverse switching cylinder 17, switching from forward/reverse 1"A to reverse (Fig. 4 c) - d〉.

Furthermore, in step 4, when the CPtJ38 energizes the forward switching solenoid valve 22 instead of the reverse switching solenoid valve 21, the reverse switching solenoid valve 21 opens and the forward switching solenoid valve 22 closes, so the forward/reverse switching cylinder 17 operates in the opposite direction to step 3 to switch the forward/reverse gear to forward again (e in Figure 4).
- f). Then, in step 5, the CPU 38 energizes only the low-speed contact solenoid valve 27 to open it, and maintains this state through step 6. As a result, the clutch control cylinder 23 operates in the opposite direction to step 2, and the clutch 2 is loosely connected (between 9 and h in FIG. 4).

In step 7, when the CPU 38 energizes and opens only the high-speed disconnection solenoid valve 24, hydraulic oil is suddenly introduced into the clutch control cylinder 23, and the clutch 2 is immediately disengaged (between i-3 in Fig. 4). > In step 8, the CPU 38 energizes only the main solenoid valve 18, the forward and reverse switching solenoid valves 22, 21, and the 1st speed switching solenoid valve 19, the main solenoid valve 18 opens and the other solenoid valves 22, 21, . 19 is closed, the gear shift switching cylinder 16 is operated and the 1st and 2nd gears are switched to 1st gear (between 1 and 1 in Fig. 4).Furthermore, in step 9, the CPU 38 operates the 1st gear switching solenoid valve. When the 2nd speed switching solenoid valve 20 is energized instead of 19, the 1st speed switching solenoid valve 19
opens and the 2nd gear switching N magnetic valve 20 closes, so the gear shifting cylinder 16 operates in the opposite direction to step 8 to switch between 1st and 2nd gears.
Switch the speed gear to 2nd speed again (between m and n in Figure 4). Then, in step 10, the CPU 38 controls the high speed tangential solenoid valve 2.
6 only to be energized and opened. As a result, the clutch control cylinder 23 operates in the opposite direction to step 7, and the clutch 2 is quickly connected (between m and n in FIG. 4).

CPLJ38 performs the above operation with each solenoid valve 18~22°24
-27 are repeatedly executed, and the inspector checks the automatically repeated operations of each cylinder 16, 17, and 23 to determine whether each solenoid valve 18-22 and 24-27 is malfunctioning. At this time, the CPU 38 drives and controls each of the solenoid valves 18 to 22 and 24 to 27 in accordance with the actual traveling of the forklift, and in order to actually operate each cylinder 16, 17, and 23, these solenoid valves 18 to 22 are operated in accordance with the actual traveling of the forklift. 22.24-2
Various types of failures that occur in 7 can occur during execution of this test mode. For example, each solenoid valve 18 to
22. Problems such as not being able to operate 24 to 27 at the same time can be cited.

Therefore, simply by running this inspection mode and checking the operation of each part, it is possible to discover failures such as inability to connect/disconnect clutch 2 or inability to change gear l17J during actual driving, and prevent such failures from occurring during actual driving. It is possible to prevent this from happening.

In addition, during the above inspection, the solenoid valves 18~22°24~2
7, but also all cylinders 16.
If 17.23 does not operate, there is an abnormality in the hydraulic oil supply section 8, a lack of hydraulic oil, or each solenoid valve 18~22.24~2
It is also possible to discover a disconnection in the harness connecting 7.

Further, the present invention is not limited to the above-mentioned embodiments, and for example, any method may be used as the condition for the CPU 38 to enter the inspection mode as long as there is no risk of the CPU 38 entering the inspection mode inadvertently during normal forklift operation. , one of the bins in the connector of the CPU 38 may be short-circuited, the pedals may be operated in a manner that is not normally operated, or a test mode switch may be provided in a location that cannot be touched by the driver.

[Effects of the Invention] As detailed above, according to the automatic transmission clutch and gear drive means failure inspection device of the present invention, it is possible to reliably discover all kinds of failures, including those that occur during actual driving. It shows excellent results.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the mechanism and electrical configuration of the forklift drive system, Fig. 2 is a hydraulic circuit diagram showing the hydraulic circuit of the forklift, and Fig. 3 shows the energization state of each solenoid valve when executing the inspection mode. The explanatory diagram shown in FIG. 4 is an explanatory diagram showing the gear switching operation and the clutch turning operation when the inspection mode is executed. 16.17 is a gear switching cylinder, 18-22 is a gear switching solenoid valve, 23 is a clutch control cylinder, 24-2
7 is a solenoid valve for controlling the clutch, 38 is a CPU for controlling inspection 1III, and 39 is a program memory as a storage means.

Claims (1)

[Claims] 1. A gear switching cylinder that switches the gear position of a transmission; a gear switching solenoid valve that controls hydraulic oil supplied to the gear switching cylinder; and gear switching by the gear switching cylinder. In an automatic transmission equipped with a clutch control cylinder that sometimes connects and disconnects the clutch, and a clutch control solenoid valve that controls hydraulic oil supplied to the clutch control cylinder, the gear change is performed while the vehicle engine is stopped. storage means storing an inspection program for driving and controlling the gear switching solenoid valve and the clutch control solenoid valve in order to operate the clutch control cylinder and the clutch control cylinder in accordance with the actual running of the vehicle; A clutch and gear drive system of an automatic transmission, comprising an inspection control means for reading an inspection program stored in a storage means and driving and controlling the gear switching solenoid valve and the clutch control solenoid valve according to the program. Failure inspection equipment.