JPH0725396B2 - Oil changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a waste oil removal pump, a new oil supply pump, a can mounting member for mounting a waste oil can and a new oil can, and the can mounting. A weighing device for measuring the weight of the placing member and a control device for computing the amount of withdrawal and the amount of oil supply based on the change in weight of the weighing device are provided, and when the amount of withdrawal computed by the control device reaches a predetermined value. Stop the extraction pump and operate the new oil supply pump. When the amount of new oil supply reaches the specified value, stop the new oil supply pump and repeat the above operation multiple times automatically to change the oil. Concerning the automatic oil changer that ends.

[Prior Art] In a conventional oil changer, for example, a nozzle is inserted into a gauge hole of an oil pan while the engine is driven, and the torque converter oil in the oil pan is extracted to supply new oil.
Guide the torque converter oil in the oil pan to the torque converter for a certain period of time, discharge the old torque converter oil in the torque converter to the oil pan, drain the oil again, and
The process of supplying new oil is repeated several times for replacement.

For example, in the oil changer disclosed in Japanese Utility Model Laid-Open No. 60-148299, oil is exchanged by repeatedly discharging waste oil and supplying fresh oil several times. However, in such a known technique, the amount of waste oil is measured for each work process and the same amount of new oil is supplied, so the work is troublesome, and errors accumulate. Further, since the liquid level sensor is used, the detection may be inaccurate.

[Problem to be solved] Therefore, an object of the present invention is to provide an oil changer capable of automatically changing a correct amount of oil.

[Means for Solving the Problem] According to the present invention, a waste oil removal pump (P1), a new oil supply pump (P2), a waste oil can (11a) and a new oil can (11).
b) a can placing member (8), a weighing means (7) for measuring the weight of the can placing member (8), and a sampling amount based on a weight change of the weighing means (7), A control device (20) for calculating the amount of oil supply, and when the withdrawal amount calculated by the control device (20) reaches a predetermined value, the extraction pump (P
1) is stopped and the new oil supply pump (P2) is activated, and when the amount of new oil supply reaches the specified value, the new oil supply pump (P2)
In the automatic oil changer that stops 2) and automatically repeats the above operation a plurality of times to end the oil change, the control device measures the weighing means (7) at that time when the oil change start switch is actuated. ) Is stored, and the weighing means (7) at that time is stored at the end of the oil change.
Compare the measured weight with the stored weight at the start, if the same, judge that the oil has been correctly changed and end the control.If the weight at the start is large, the pump for draining waste oil is equal It has the function of driving (P1) to drain the oil and, when the weight at the end is large, driving the new oil supply pump (P2) to supply new oil until the weight is equal.

[Operation] In the oil changer configured as described above,
The control unit measures the weight of new oil in the oil can, new oil in the waste oil can, and waste oil at the start with the weighing means and stores it as the weight at the start. It is measured, and when the measured weight is equal to the starting weight, it is determined that the replacement is completed.

If the measured weight is greater than the starting weight when the set amount is reached, it is determined that the amount of lubrication is insufficient,
Lubricate until both weights are equal, and if the measured weight is less than the starting weight, determine that the amount taken is insufficient and drain the waste oil until both weights are equal.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, an upper chamber 2 and a lower chamber 3 are defined inside a main body case 1.

A support girder 6 is horizontally supported on the upper side of the lower chamber 3, and a well-known weighing means 7, for example, a load cell is provided on the center upper part of the support girder 6. A can placing member 8 is hung above the weighing means 7, and the can placing member 8 is suspended.
A rectangular long hole 9 is formed in a portion where the support girder 6 penetrates.

A waste oil can 11a and a new oil can 11b are placed in the can placing member 8.

A hose 12a is inserted into the waste oil can 11a, the hose 12a is connected to a hose 13a via a waste oil extracting pump P1 and a solenoid valve V1, and a nozzle 14 is connected to the hose 13a. Similarly, the hose 12b inserted in the new oil can 11b is
It is connected to the nozzle 14 via a solenoid valve V2, a new oil supply pump P2, and a hose 13b. And these pumps P1, P2
The solenoid valves V1 and V2 are connected to a control unit 20 which is a control unit constituted by a microcomputer provided in the upper chamber 2 together with a weighing unit 7 such as a load cell.
20 is an indicator 15 for displaying the amount of oil measured by the weighing means 7.
And a keyboard 16 for operating and setting the oil amount, and a speaker
17 and are connected.

In FIG. 2, the control device 20 is composed of a microcomputer, is provided with a central processing unit (CPU) 21, and the waste oil extraction pump P1 and new oil supply pump are provided via an input / output device (I / O) 22. It is connected to each device such as P2. Therefore, the signal from each device is input to the central processing unit 21 via the input / output device 22, and the signal from the central processing unit 21 is transmitted to each device via the input / output device 22. There is. In addition to the central processing unit 21, the control device 20 is provided with a ROM (ROM) 23, a RAM (RAM) 24, and a clock 25.

Next, the operation will be described mainly with reference to FIGS. 3 and 4.

FIG. 3 shows the flow of replacing the torque converter oil.

At the time of replacement, the set amount according to the vehicle type as shown in FIG. 5 is input by the keyboard 16, the nozzle 14 is inserted into the gauge hole of the oil pan of the automobile where the engine is driven, and the start switch of the keyboard 16 is pushed. Then (step S1), the control device 20 stores the weights of fresh oil and waste oil and WY at the start by the weighing means 7 and stores them in the ram 24 (step S1).
2) Open the solenoid valve V1 and drive the waste oil draining pump P1 to drain the waste oil (step S3). And the basic sampling amount W1
When it reaches (for example, 1.5l) (step S4), the solenoid valve V1 is closed, the waste oil extraction pump P1 is stopped (step S4a), the solenoid valve V2 is opened, and the new oil supply pump P2 is driven to generate new oil. Refuel (step S5). Then, when the amount of oil supplied to the oil pan reaches a predetermined amount W2 (for example, 2.3 l) (step S6), the solenoid valve V2 is closed and the fresh oil supply pump P2 is stopped (step S6).
S6a), after idling for a predetermined time T1 (for example, 1 minute) (step S7), open the solenoid valve V1 to remove the waste oil pump
Drive P1 to drain the waste oil again (step S8). Next, when the amount to be withdrawn reaches a predetermined amount W3 (for example, 2.3 l) (step S9), the solenoid valve V1 is closed, the waste oil withdrawing pump P1 is stopped (step S9a), and the process proceeds to step S18. However, before the sampling amount reaches the predetermined amount W3, it is determined whether the sampling end shown in the flow of FIG. 4 is stored (step S10). If step S10 is YES, the solenoid valve V1
To stop the waste oil extraction pump P1 and see if the end of refueling is stored (step S11). If not stored, move to step S18. If stored, the weighing means 7 The weights of the new oil and the waste oil at the time point are measured, and it is determined whether or not the measured weight is equal to the stored starting weight WY (step S12). If they are equal, the control is ended, and if they are not equal, it is determined whether or not the measured weight is larger than the starting weight WY (step S13). If it is large, it means that the amount of oil supplied is insufficient or the amount of oil extracted is too large.However, since the amount of oil extracted cannot be reduced at this point, the solenoid valve V2 is opened assuming that the amount of oil supplied is insufficient. , Driving the new oil supply pump P2 to supply oil (step S1
4) If the measured weight becomes WY equal to the start weight (step S15), close the solenoid valve V2, and pump P for fresh oil supply.
2 is stopped (step S15a), and the control ends. Step S
When 13 is NO, that is, the measured weight is the starting weight WY
If it is smaller, it means that the amount of oil extracted is insufficient or the amount of oil supplied is too large.However, since the amount of oil supplied cannot be reduced at this point, it is considered that the amount of oil extracted is insufficient and the solenoid valve If V1 is opened and the waste oil extraction pump P1 is driven to extract the waste oil (step S16) and the measured weight becomes equal to the starting weight WY (step S17), the solenoid valve V
1 and close the waste oil extraction pump P1 (step S17
a), end control.

In step S18, the solenoid valve V2 is opened, the new oil supply pump P2 is driven, and new oil is supplied again. Then, when the amount of refueling reaches a predetermined amount W4 (for example, 2.3 l) (step S1
9), close the solenoid valve V2, stop the fresh oil supply pump P2 (step S19a), and move to step S28. However, before the refueling amount reaches the predetermined amount W4, it is checked whether the refueling end is stored (step S20).
2 is closed, the new oil supply pump P2 is stopped, and then it is checked whether or not the end of extraction is stored (step (S21). If not stored, the process proceeds to step S28, and if stored, Similar to step S12, it is determined whether or not the measured weight is equal to the start weight WY (step S22) .If the measured weight is equal, the control is ended, and if not equal, the measured weight is greater than the start weight WY. If it is larger, the solenoid valve V2 is opened, the new oil supply pump P2 is driven to supply oil (step S24), and if the measured weight becomes equal to the starting weight WY (step S23). S2
5) Close the solenoid valve V2, stop the fresh oil supply pump P2 (step S25a), and end the control. When step S23 is NO, that is, when the measured weight is smaller than the starting weight WY, the solenoid valve V1 is opened, the waste oil extracting pump P1 is driven to extract the waste oil (step S26), and the measured weight is the starting weight. Is equal to (step S27), the solenoid valve V
1 and close the waste oil extraction pump P1 (step S27
a), end control.

In step S28, after a predetermined time T2 (for example, idling for 4 minutes), the process returns to step S8, and thereafter step S1.
2, S15, S17 or S22, S25, S27 becomes YES and is repeatedly executed until the control ends.

FIG. 4 shows a flow for storing the end of refueling and the end of withdrawal used in steps S10, S11, S20 and S21 of FIG.

In addition, Fig. 5 shows the number of withdrawal oil supply and the withdrawal amount for each number of times when the set amount of oil to be replaced is 6 l, 7 l, 8 l, 9 l,
An example of refueling amount and idle time is shown.

The control device 20 determines whether or not the total refueling amount (total refueling amount) is equal to a preset amount preset according to the vehicle type as shown in FIG. 5 (step S30), and whether the sampling amount has reached the preset amount. (Step S40) is determined. And
In step S30, if the total refueling amount becomes equal to the set amount, the end of refueling is stored (step S31, which is used in steps S11 and S20), and the total withdrawal amount (total withdrawal amount) is the fifth. As shown in the figure, when it becomes equal to the set amount (step S32), the completion of extraction is stored (step S3).
3, this is used in steps S10 and S21), the control ends.

If the total sampling amount becomes equal to the set amount in step S40, the completion of sampling is stored (step S41
This is used in steps S10 and S21), and if the total amount of refueling becomes equal to the set amount (step S42), the end of refueling is stored (step S43, which is used in steps S11 and S20). , Control ends.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(I) Since the sum of the extracted amount and the sum of the refueled amount are made equal, there is no accumulation of error for each withdrawal and refueling.

(Ii) The amount of oil can be accurately converted regardless of the number of times of sampling and refueling.

(Iii) Since the weight is measured, there is no influence of volume change due to temperature.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention, FIG. 2 is a control block diagram, FIG. 3 is an oil exchange control flowchart, and FIG. 4 is a control flowchart for terminating oil exchange at a set amount. , FIG. 5 is a diagram for explaining a specific state of oil exchange. P1 ... Waste oil extraction pump, P2 ... New oil supply pump, 7 ... Weighing means, 8 ... Can mounting member, 11a ... Waste oil can, 11b ... New oil can,
20 ... Control device, V1, V2 ... Solenoid valve

Claims (1)

[Claims] 1. A pump (P1) for removing waste oil, a pump (P2) for supplying new oil, a can placing member (8) for placing a waste oil can (11a) and a new oil can (11b), The weighing device (7) for measuring the weight of the can placing member (8) and the control device (20) for calculating the amount of withdrawal and the amount of oil supply based on the weight change of the weighing device (7) are provided. When the withdrawal amount calculated by the device (20) reaches the specified value, the withdrawal pump (P1) is stopped and the new oil supply pump (P2) is activated to reach the specified amount of new oil. Then, stop the new oil supply pump (P2),
In an automatic oil changer that automatically repeats the above operation a plurality of times to end the oil change, the control device stores the measured weight of the weighing means (7) at the time when the oil change start switch is activated. At the end of the oil change, the weight measured by the weighing means (7) at that time is compared with the stored weight at the start, and if they are the same, it is determined that the oil has been correctly changed, and the control is ended. When the weight is large, drive the waste oil removal pump (P1) until the weight is equal, and when the weight at the end is large, drive the new oil supply pump (P2) until the weight is equal. An oil changer having a function of supplying oil.