JPH0781619B2 - Oil quantity control device for automatic transmission - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automobile assembly or inspection process,
The present invention relates to a device that manages the hydraulic fluid amount of an automatic transmission to an appropriate amount.

2. Description of the Related Art For example, an automatic transmission mounted on a vehicle is a vehicle inspection of 5.4.5 (c) of 178P in "Automotive Engineering Complete Book Vol. 18 Manufacturing Management of Vehicles" (published on December 25, 1980 by Sankaido). As disclosed in the section, inspection is performed before passing to the next process and before shipping. In particular, before mounting it on a vehicle, it is necessary to fill it with hydraulic oil and perform an actual test on the transmission itself.
Therefore, after the test, the hydraulic oil is extracted and then transported to the assembly process. In this case, the hydraulic oil is not completely drained,
Even in the assembling process, the hydraulic oil during the test remains in the transmission, and the residual oil amount is not constant in many cases.

Therefore, it is difficult to manage the proper amount of oil even if the fixed amount of hydraulic oil is filled again after the transmission is mounted on the vehicle.

In addition, the measurement management by the oil surface position of the hydraulic oil is performed in the idling state after the engine warms up (the oil temperature in the transmission is 50 to 80 ° C).
It is general that the oil level position is changed depending on the warmed-up state.

Since there are many unstable factors as described above, the following method has been conventionally used to control the amount of hydraulic oil to an appropriate amount.

That is, after warming up the vehicle, the worker measures the oil amount with the level gauge, and further inserts a thermometer such as a thermocouple from the level gauge insertion portion to measure the oil amount. Then, based on the measured oil amount and the oil temperature, for example, the operator determines the amount of oil to be extracted or replenished from the conversion chart, and the excess or deficient oil amount is withdrawn or replenished to obtain an appropriate oil amount. It is a thing.

Problems to be Solved by the Invention According to the conventional method, the operator is required to perform the process from the determination of the amount of oil to be replenished or withdrawn to the actual replenishment or withdrawal of the hydraulic oil, so that there are individual differences among the workers. It is difficult to maintain a constant amount of oil, and the number of man-hours is large, which puts a heavy burden on the operator.

Means for Solving the Problems The present invention is intended to provide an oil amount management device that automates the series of operations described above.

Specifically, it is connected to an oil-filled pipe of an automatic transmission and is slidable with respect to the outer cylinder,
And a recovery circuit that includes a nozzle composed of an inner cylinder provided with a temperature sensor at the tip and a recovery tank connected to a vacuum source, recovers the hydraulic oil in the transmission to the recovery tank through the nozzle, and the operating oil A filling circuit that includes a stored hydraulic oil tank and a pump and fills the transmission through the nozzle with an appropriate amount of hydraulic oil that corresponds to the capacity of the transmission according to the temperature detected by the temperature sensor.

Action In the present invention, since the amount of hydraulic oil remaining in the transmission is not constant as described above, first, the residual oil amount is recovered by the recovery circuit until it reaches a predetermined level, and the residual oil amount is always constant. Create a preliminary condition that satisfies As a result, since the hydraulic oil capacity of the transmission is known, the amount of hydraulic oil to be replenished in the transmission until the full amount is obtained.

Then, in consideration of the temperature of the hydraulic oil remaining in the transmission, the amount of hydraulic oil to be replenished is corrected to obtain an appropriate amount. These proper amount oils can be obtained by reading from a data map previously stored in the control device according to the temperature detected by the temperature sensor.

Therefore, by supplying the value as a command value to the variable displacement pump, for example, to fill the hydraulic oil, the hydraulic oil in the transmission is always maintained at an appropriate level.

Embodiment FIG. 1 and FIG. 2 are views showing a more specific embodiment of the present invention.

In FIG. 1, 1 is an automatic transmission mounted on a vehicle, and 2 is an oil filling pipe attached to the automatic transmission 1.

Reference numeral 3 is a nozzle connected to the oil filling pipe 2, and this nozzle 3 has a flexible outer cylinder 4 and an inner cylinder 5 as shown in FIG. One end of the outer cylinder 4 is fixed to the support 6, and the other end is fixed with a stopper 8 by a nut 7 as shown in FIG.

By applying the stopper 8 to the opening of the oil filling pipe 2, the insertion stroke of the inner cylinder 5 into the oil filling pipe 2 is regulated.

Both ends of the inner cylinder 5 project from the end of the outer cylinder 4, while the inner cylinder 5 is slidable with respect to the outer cylinder 4. One end of the inner cylinder 5 is connected to a recovery passage 18 described later by a joint 9. Also,
A push-pull mechanism 10 for sliding the inner cylinder 5 with respect to the outer cylinder 4 is provided in a part of the inner cylinder 5. That is, the rack 11 is provided in a part of the inner cylinder 5, and the rack 11
On the other hand, the pinion 13 which is rotationally driven by the motor 12 is engaged. Therefore, the insertion length of the inner cylinder 5 into the oil filling pipe 2 can be adjusted by the operation of the push-pull mechanism 10.

A temperature sensor 14 is attached to the tip of the inner cylinder 5 as shown in FIG. The harness 15 connected to the temperature sensor 14 is taken out of the inner cylinder from the joint 9 and connected to the amplifier 16. Therefore, the temperature sensor 14
Is output to the control device 17 mainly composed of a microcomputer through the amplifier 16.

Reference numeral 18 denotes a recovery passage connecting the nozzle 3 and the recovery tank 19, and the inside of the recovery tank 19 is always kept at a predetermined vacuum degree by the operation of the vacuum pump 20. Reference numeral 21 is a solenoid valve, and 22 is a vacuum switch, which together constitute a recovery circuit 23.

Reference numeral 24 is a filling passage connecting the nozzle 3 and the hydraulic oil tank 25. A predetermined hydraulic oil is stored in the hydraulic oil tank 25, while it is connected to a pressure source 27 via a pressure passage 26,
The inside of the tank 25 is pressurized according to the operation of the solenoid valve 28.

29 is a piston type pump driven by an air cylinder 30, the discharge side chamber 29a of the pump 29 is connected to the filling passage 24, and the hydraulic oil in the hydraulic oil tank 25 is temporarily stored in the chamber 29a. Will be taken into account. Further, the air cylinder 30 is provided with a stroke detector 31, and by controlling the stroke by a signal given from the control device 17, it is possible to substantially variably control the amount of oil discharged from the pump 29. As described above, the filling passage 24 and the hydraulic oil tank
The filling circuit 32 is constituted by 25 and the pump 29.

33, 34 and 35, 36 are all solenoid valves, and a return passage 37 including the solenoid valve 35 is provided to return the hydraulic oil collected in the recovery tank 19 to the hydraulic oil tank 25.

The oil amount management device configured as described above operates as follows.

The operator inserts the inner cylinder 5 into the oil filling pipe 2 until the stopper 8 of the nozzle 3 hits the open end of the oil filling pipe 2 of the automatic transmission 1.

At this time, the protrusion length of the inner cylinder 5 from the outer cylinder 4 is controlled by the push-pull mechanism 10, and the insertion length of the nozzle 3 into the oil filling pipe 2 is regulated by the stopper 8, so that the nozzle for the oil filling pipe 2 is controlled. The insertion depth of 3 is always constant.

When the operator starts the operation after the nozzle 3 is set, the solenoid valve 21 is opened, and the negative pressure in the recovery tank 19 causes the working oil in the automatic transmission 1 to be sucked and recovered in the recovery tank 19. In this case, since the temperature sensor 14 is immersed in the hydraulic oil, the oil temperature is measured and taken into the control device 17.

Recovery of the hydraulic oil in the automatic transmission 1 progresses and the oil level drops,
When air is sucked from the tip of the nozzle 3, the degree of vacuum of the recovery passageway 18 including the recovery tank 19 is lowered. The vacuum switch 22 detects this decrease in the degree of vacuum and closes the solenoid valve 21 to complete the recovery of the hydraulic oil.

Therefore, as described above, as long as the insertion depth of the inner cylinder 5 into the oil filling pipe 2 is constant, the automatic transmission 1
The amount of hydraulic oil left inside is always constant.

Next, the control device 17 knows in advance the amount of oil to be replenished until the hydraulic oil in the automatic transmission 1 becomes full with reference to the amount of oil left in the automatic transmission 1 as described above. The oil temperature remaining in the transmission is not taken into consideration in this oil amount.

Therefore, the control device 17 calculates the amount of oil to be replenished corresponding to the temperature detected by the temperature sensor 14 in accordance with the detected temperature. That is, as described above, the amount of oil that has been grasped in advance is corrected according to the oil temperature. This is done by reading the data map previously written in the memory of the controller 17.

More specifically, for example, when the temperature of the hydraulic oil remaining in the automatic transmission 1 is high, the hydraulic oil itself is thermally expanded,
Increase the amount of oil to replenish. On the contrary, when the oil temperature is low, the amount of oil to be replenished is reduced.

Then, the control device 17 controls the pump according to the amount of oil to be replenished.
A stroke command for operating 29 is given to the air cylinder 30.

Prior to the operation of the air cylinder 30, the solenoid valves 28, 34 open,
A part of the hydraulic oil in the hydraulic oil tank 25 that is pressurized is introduced into the chamber 29a of the pump 29. Then, the solenoid valve 33 opens and the air cylinder 30 extends, and the air cylinder 30 operates for a command stroke, whereby a predetermined amount of hydraulic oil is filled in the automatic transmission 1 through the nozzle 3.

When the replenishment of the hydraulic oil is completed, the push-pull mechanism 10 operates to move the inner cylinder 5 upward until the tip of the inner cylinder 5 separates from the oil surface in the automatic transmission 1. Then, by opening the solenoid valve 21, the working oil remaining in the nozzle 3 and the filling passage 24 is recovered in the recovery tank 19.

As a result, the amount of oil in the automatic transmission 1 is always constant,
It will be maintained and managed in an appropriate amount with no excess or deficiency.

The hydraulic oil in the recovery tank 19 is returned to the hydraulic oil tank 25 and reused by opening the solenoid valve 35 appropriately.

EFFECTS OF THE INVENTION According to the present invention, it is possible to automatically stabilize the amount of oil left in the automatic transmission, automatically measure the oil temperature, and automatically fill an appropriate amount of hydraulic oil commensurate with the oil temperature. Therefore, the amount of oil in the automatic transmission can always be maintained at an appropriate amount without excess and deficiency, and the burden on the operator can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a half sectional view of a nozzle. 1 ... Automatic transmission, 2 ... Oil filling pipe, 3 ... Nozzle, 4 ... Outer cylinder, 5 ... Inner cylinder, 10 ... Push-pull mechanism, 14 ... Temperature sensor, 17 ... Control device, 18 ...... Recovery passage, 19 ...... Recovery tank, 20 …… Vacuum pump, 23 …… Recovery circuit, 24 …… Filling passage, 25 …… Operating oil tank, 29 ……
Pump, 32 ... Filling circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Imai 3-11-13 Kita-Shinagawa, Shinagawa-ku, Tokyo Nissan Motor Sales Co., Ltd. (56) Reference JP-A-54-76300 (JP, A) Sho 60-45813 (JP, U)

Claims (1)

[Claims] 1. A nozzle connected to an oil-filled pipe of an automatic transmission, comprising an outer cylinder, an inner cylinder slidable with respect to the outer cylinder and having a temperature sensor at its tip, and a vacuum. A temperature sensor including a recovery circuit including a recovery tank connected to a power source, recovering the hydraulic oil in the automatic transmission to a predetermined level through the nozzle to the recovery tank, a hydraulic oil tank storing the hydraulic oil, and a pump. And a filling circuit for filling the automatic transmission with an appropriate amount of hydraulic oil corresponding to the detected temperature of the automatic transmission through the nozzle.