JPS5945874B2 - automatic oil change machine - Google Patents

Description

[Detailed Description of the Invention] The present invention is configured to change the engine oil of an automobile under the control of a digital control device, and it is possible to greatly automate the engine oil change, which has traditionally been a very troublesome task. This article relates to an automatic oil change machine that allows for automatic oil change.

Conventionally, engine oil in automobiles was replaced by a stand-up serviceman, and used engine oil was drained by a vacuum pump from the tipstick hole or from the engine oil pan outlet. .

Furthermore, new engine oil was supplied using an oil cup from the oil filler port at the top of the engine.

The present invention has been made in view of the above points, and has an object to obtain an automatic oil change machine that can greatly automate the work of changing engine oil, which has conventionally been a very troublesome work as described above. It has been done.

That is, the present invention provides an automatic oil change machine that is equipped with a digital control device, is configured to control the supply and discharge device connected to the digital control device, and is capable of greatly automating the engine oil change operation. .

The present invention will be described in detail below based on Examples.

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention.

In the figure, 1 is a supply/discharge device that drains used engine oil from an automobile oil tank and supplies new engine oil from a new oil tank, and 2 is a digital control device that controls this supply/discharge device. be.

The digital control device 2 is configured as follows.

A central processing unit 3 is the central processing unit of the digital control device 1, and is composed of a large-scale integrated circuit including an arithmetic unit, a control unit, and a storage unit.

Reference numeral 4 denotes a human-powered device consisting of numeric keys for inputting the desired amount of refueling into the storage section of the central processing unit 3, a clear entry key for manually correcting the numeric values, a start key for starting the operation of the fuel supply/discharge device, and the like.

Reference numeral 5 designates a unit price setting switch for setting the unit price of engine oil 9 and inputting the unit price to the storage section of the central processing unit 3.

The unit price setting switch 5 is provided in consideration of the fluidity of engine oil prices.

Furthermore, 6 is a display device that displays 1.9 desired amount of refueling, unit price, and payment amount.

Further, 7 is a printing device, which prints out the amount of oil to be supplied, the unit price, and the payment amount and outputs it as a slip.

On the other hand: The supply/discharge device 1 includes a pump 8 that is controlled by a single-acting signal from the digital control device 2 to operate the supply/discharge device 1, a solenoid valve 9 for switching between oil drain and oil supply, and detects the completion of oil drain. It mainly consists of a loading sensor 10 for use in the oil tank, and a flow meter 11 for counting the amount of oil supplied from the new oil tank to the oil tank of the automobile.

1. The automatic oil change machine and its operation in this embodiment are roughly as follows.

The desired amount of refueling, which is input by two operators by operating the key operator 4, is stored in the storage section of the central processing unit 3.

After that, when the start key is operated, a pump drive signal is output, and the pump 8 starts rotating and the oil draining cycle begins.

Roti (sensor 10 is unloading (no load)
When the central processing unit 3 detects the completion of oil draining based on the signal from the loading sensor 10, the solenoid valve switching signal for oil draining and refueling switching is sent to the central processing unit 3 based on the sensor output. Output.

In response to this switching signal, the solenoid valve 9 for switching drain oil and refueling is switched from the discharge extended state to the refueling state, and a refueling cycle begins.

The flowmeter 11 counts the amount of oil to be supplied based on the pulse signal from the side, and the oiling cycle progresses while comparing this count with the desired amount of oil 6.Then, the actual amount of oil to be supplied and the desired amount of wheel oil match. Then, the rotation of the pump 8 is stopped, and the solenoid valve 9 for switching between oil drain and oil supply is switched to the oil drain state again, and the oil supply cycle is completed.

On the other hand, the unit price is input to the central processing unit 3 from the unit price setting switch 5, and the amount of oil to be supplied is multiplied by the unit price to calculate the payment amount.

The amount of oil supplied, the unit price, and the payment amount are printed by the printing device 7 and output as a slip, and the unit price and the payment amount are displayed on the display device 6.

FIG. 2 is a flowchart showing the operations of the customer (user) in the automatic oil exchange machine of this embodiment and the operation of the automatic oil exchange machine of this embodiment.

Also, Figure 3 A is a configuration diagram showing the detailed configuration of this embodiment, and points A, B, 6, and D in Figure 3 A are A/A and B in Figure 3, respectively. Connect to point ', point 67, and point d.

3A shows the supply/discharge device 1, and FIG. 3A shows the digital control device 2.

The configuration of this embodiment will be described in more detail below with reference to the above drawings.

1. Description of supply/discharge device 1 The oil tank 12 is located inside a car, and the supply/discharge nozzle 13 is inserted into the oil tank 12 through a tip stick hole to drain and supply oil.

When draining oil, oil flows from the oil tank 12 to the waste oil tank 14 (dotted arrow in the figure), and when refueling, oil flows from the new oil tank 1.5 to the oil tank 12 (solid arrow in the figure). ).

8 operates the supply/discharge device 1 to always flow oil in one direction using the Z pump.

A three-way solenoid valve is used to switch between oil drain and oil supply.
This is done by controlling this solenoid valve alternately between the oil drain cycle and the oil supply cycle.

In the figure, "'cis, iz, and ia" are the three-way switching solenoid valves, and 19, 20.21 are the three-way switching solenoid valves 16.
This is an electromagnetic coil drive circuit that controls switching between 17 and 18.

Electromagnetic coil drive circuit 19, 20, 21. By switching and controlling the three-way solenoid valve 16°17.18,
When draining oil, it is transferred from the oil tank 12 to the waste oil tank 14 via the three-way solenoid valve 17, the pump 8, and the three-way solenoid valve 1:8.
When refueling, oil flows to the male tank 12 via the new oil tank 15, the three-way solenoid valve 16, the pump 8, the three-way solenoid valve 18, and the three-way solenoid valve 11.
In: Oil and oil flow (solid arrow line in the figure).

[Description of configuration of three-way switching solenoid valves 16, 17, and 18] Three-way switching solenoid valves are conventionally known, and the configuration of the three-way switching solenoid valves 16, 17, and 18 used in this embodiment is shown in Fig. 4. I will explain based on this.

FIG. 4 is a partial cross-sectional configuration diagram showing the configuration of the three-way switching solenoid valves 16, 17, 18.

In the figure, 22. is the main body of the three-way switching solenoid valve, and 23.
Reference numerals 24 and 25 indicate pipes connected to the three-way switching solenoid valve main body 22.

Electromagnetic coil? By energizing 6, the armature 27 moves to the right in the figure, cutting off the pipe 23 and establishing continuity between the pipes 24 and 25.
(2) On the other hand, when the power to the electromagnetic coil 26 is cut off, the armature 27 is moved to the left in the figure by the action of the spring 28, the pipe 25 is cut off, and the pipes 23 and 24 are brought into a conductive state.

The three-way switching solenoid valve 16, 17, 18 shown in FIG.
20. When no signal is given to 21 and the electromagnetic coil 26 is not energized (during oil draining), the three-way switching solenoid valve i 6 , 1 shown in the figure
The pipes 23 and 24 connected to the pipes 7 and 18 are in a conductive state, and oil is drained through the above-mentioned voice path.

On the other hand, when a signal is given to the electromagnetic coil drive circuit 19, 20.21 and the electromagnetic coil 26 is energized (during refueling), the distance between the pipes 24 and 25 connected to the three-way switching electromagnetic valve 16, 17, and 18 in the figure is Each is in a conductive state, and oil is supplied through the above-described route.

Next, a loading sensor 10 is provided to detect that oil has been drained from the oil tank 12 to the waste oil tank 14, and a flow rate is provided to measure the amount of oil supplied to the oil tank 12 from the new oil tank 15. A total of 11 will be explained.

The loading sensor 10 is configured as follows.

That is, the loading sensor 10 includes a movable valve 35 provided between the underside switching solenoid valve 18 and the waste oil tank 140, a movable contact piece 30, a fixed contact 33, : Consists of a contact signal generation circuit 34 connected to this fixed contact 33.

It's ℃.

The movable contact piece 30 is urged downward in the drawing by a spring 31, and is also supplied with a ground potential by the mononuclear spring 31.

When the oil flows through the pipe, the movable valve 35 becomes parallel as shown by the solid line in the figure.

Therefore, the movable contact piece 30 interlocked with the movable valve 35 is also parallel to the movable contact piece 30 as shown by the solid line in the figure, one end of which is in contact with the fixed contact 33, and the output of the contact signal generation circuit 34 is "1".

On the other hand, when the oil stops flowing through the pipe, the movable contact piece 30 returns to the position shown by the two-dot chain line in the figure due to the action of the spring 31, and in conjunction with this, the movable valve 35 also returns to the position shown by the two-dot chain line in the figure. and a movable contact piece 30 and a fixed contact point 33 on the buttocks.
The contact is broken, and the output of the contact signal generation circuit 34 becomes "0".
”.

Based on the output of the contact signal generation circuit 34, completion of oil draining is detected within the digital control device 2.

Due to air bubbles in the vibrating oil of the movable valve 35, or during oil drainage, the movable contact piece 30 may separate from the fixed contact 33, and the output of the contact signal generation circuit 34 may temporarily become "0". So,
As will be described later, in this embodiment, the contact signal generation circuit 3
When the output No. 4 continues to be "0" for 10 seconds, an oil drain completion detection signal is output, and the oil drain cycle is switched to the oil supply cycle.

On the other hand, the flow meter 11 is constructed as follows.

The flow meter 11 is provided between the new oil tank 15 and the three-way switching solenoid valve 160.

As shown in the figure (the flow meter 11 is installed in the oil supply path from the new oil tank 15 to the three-way switching solenoid valve 16, and is connected to a root wheel 36 that rotates with the flow of oil, and a rotor 36 that rotates synchronously with the impeller 360 rotations). synchronous disc 31 and this synchronous disc 37
Pulse generation circuit 3 that generates pulses at 0 rotation
It consists of 8.

The synchronous disk 31 has the same number of holes 40 as the impeller 360 in its peripheral portion.

The pulse generating circuit 38 has holes 4 on both sides of the synchronization disk 310.
It consists of a lamp 41, a light-receiving element 42, and a circuit 43 which outputs a pulse PP based on the output from the light-receiving q-element 42, which are provided at positions facing each other through the light receiving element 42.

As is clear from the structure of the stop, when refueling begins, impeller 3
6 begins to rotate, and in synchronization with it, the synchronous disk 37 also begins to rotate.

The distance between the blades is 15.6c, C in this example.
, corresponds to the operation, one "C10,6C1C," and one pulse P is generated from the pulse generation circuit 38 every time oil is supplied.
P is output to the digital control device 2.

As will be described later, the refueling amount is counted in the digital control device 2 based on this pulse 2PP, and the refueling cycle progresses while comparing it with the input desired refueling amount.

2. Description of Digital Control Device 2 Next, the digital control device 2 that controls the operation of the supply/discharge device 1 will be explained based on the circuit diagram shown in FIG.

By operating the numeric key 44 of the key-operated device 4, the desired amount of oil to be supplied is encoded in binary by an encoder 45 and manually entered into a two-digit register 46 for storing the desired amount of oil to be supplied.

47 is a circuit that outputs a timing signal that determines the timing for introducing the numerical signal output from the encoder 45 into the two-digit register 46 based on a key operation, and outputs the logical product of this timing signal and the output of the encoder 45. By introducing the encoder 45 into the two-digit register 46, the output of the encoder 45 is input into the two-digit register 46 at the timing determined by the timing signal.

In this embodiment, the number of registers into which the desired amount of refueling is input is 2.
The number of digits can be changed arbitrarily if necessary.

Also, decimal point information, specifically, the number of digits below the decimal point in the numerical value manually entered into the cash register 46, is stored in the number point register 48.

That is, the decimal point signal generated by pressing the decimal point key 441 sets the decimal point ``49□''.

After that, when the numeric key 44 is pressed, the timing signal generated by the timing code generation circuit 47 and the output signal J numeric value 1' of the decimal point raritub flop 49 (Shinshu o
The output of the AND gate 501 whose input is 01□) is applied to one input of the adder 51.
After the addition with the contents of decimal point register 48 given to the other input of 1 has been completed, the output is again introduced into decimal point register 4.

The content of the decimal point key 48 is "0" until the decimal point key 441 is pressed, and >''<number point 1+=4'41
is pressed and then the numeric key 44 is pressed: Then, from the above explanation, it is clear that 11 □ is added to the contents of the decimal point register 48 ("Oj") up to that point. It was introduced in 48, and it is remembered that the number of digits below the 9th point is one digit higher.

□ You can input the desired refueling amount by entering the number above.

Next, when the start key 52 is pressed, the mote digital control device 2 outputs a pump drive signal to the supply/drainage device 1, thereby starting the oil draining cycle.

In this embodiment, the contents of the register 46 and the decimal point register 48 are detected, and if the input desired oil supply amount is 101 or more, or if the desired oil supply amount is not input, the pump will start even if the start key 52 is pressed. The signal is not derived.

This is because the capacity of the oil tank 12 is generally less than 101, and if a desired oil supply amount of 101 or more is input, there is a strong possibility that it is an incorrect input.

In the figure, 53 is a detection circuit for detecting whether the contents of the register 46 are "0" or not.
0", the output is "-1".

Further, 54 is a detection circuit for detecting whether or not the second digit of the register 46 is 10.
”, the output is “1”.

55 is a circuit for detecting whether the content of the decimal point register 48 is "10" or not; when the content is "10", the output is "l".

・The output of the detection circuits 54 and 55 is an AND gate 560
2 input terminals.

Then, the output of this AND gate 56 and the above detection circuit 53
The output of the NOR gate 5702 is applied to the input terminal of the NOR gate 5702, and the output of the NOR gate 57 is applied to one input terminal of the tend gate 58.

A key signal from the start key 52 is applied to the other input terminal of the Nant gate 58.

'5'8 is the output signal of the AND gate 58 is given to its set input terminal, and in the set state, the pump 8 is supplied with 1
This is a clip-flop that derives the drive signal.

□As is clear from the above configuration (if the input desired refueling amount is greater than or equal to IOA, or if the desired refueling amount is not input, the output of the Noah gate 57 will be "0", and as a result, the AND gate 58 will be closed). It is in a state of development.

Therefore, even if the start key 52 is pressed, the AND gate 58 does not output an output signal (), the limp flop 59 remains in the reset state, the pump drive signal is output, and the supply/discharge device 1 remains in the stopped state.

On the other hand, the desired amount of oil supplied manually is larger than Ol (,107
When it is less than, the output of the NOR gate 57 becomes "L", and:
The AND gate 58 outputs the key signal from the start key 52 to the set input terminal of the flip-flop 59.

As a result, the flip-flock 59 is set and the pump 8
A pump drive signal is derived and the pump 8 starts operating.

The output of the AND gate 58 is also applied to the reset input of the decimal point flip-flop 49 via the OR gate 101.

Therefore, the decimal point flip-flop 49 is also reset at this time.

60 is a flip frog for switching between oil drain and oil supply;
At this time, it is in a reset state.

Accordingly, no drive signal is derived to the °C electromagnetic coil drive circuits 19, 20, 21, and the three-way switching solenoid valves 16, 17, 18 are in the oil draining state.

Therefore, with the operation of the pump 8, the oil drain cycle begins.

When the oil drainage is completed, the movable contact piece 30 of the above-mentioned rope swing station 10 is separated from the fixed contact 33, and as a result, the output of the contact signal generation circuit 34 changes from "1" to "0".

61 is a timer circuit which receives an output signal from the contact signal generation circuit 34, and whose output changes from "1" to "0" 10 seconds after its input changes from "11" to "10".

This timer circuit 61 is constructed using a monostable multivibrator, and when its input is "L", its output is "L".
The timer circuit 61 may be constructed using a retrigger malte vibrator.The timer circuit 61 is configured so that the output becomes 10'' after 10 seconds after the human power changes from 1 to 10.

62 is a circuit which receives the output signal from the timer circuit 61 and outputs a single pulse, that is, an oil drain completion detection signal when the output signal changes from "l" to "0", and is composed of a differential circuit. .

By configuring as above, loading sensor 1
The movable contact piece 30 constituting the fixed contact 3 may temporarily close due to vibration of the movable piece 35 or air bubbles in the oil.
3, the output of the contact signal generation circuit 34 temporarily becomes 1.
Even if the signal becomes 0, the oil drain completion detection signal will not be output erroneously.

The oil drain completion detection signal is applied to one input terminal of the AND gate 63, and the flip/flop 590 set output signal is applied to the other input terminal of the AND gate 63.

Furthermore, the output of the AND gate b3 is input to the control order control circuit 64.

The control order control circuit 64 mainly consists of address flip-flops 65 to 70 that are set in sequence and a circuit that outputs micro-orders 1 to 2 based on the state of the address flip-flops.

When the oil draining is completed and the oil draining completion detection signal is output, the AND gate 63 outputs an output signal, and the address flip-flop 65 is set.When the address flip-flop 65 is set, a micro order ■ occurs. do.

The micro order (2) is applied to the input terminal of a slip-flop 600 set for switching between drain oil and refueling.

Accordingly, the flip-flop 60 becomes set and a drive signal is output to the electromagnetic coil drive circuit 19.degree.20.21 which controls the three-way switching solenoid valve 16.degree.17.18 of the above-mentioned supply/discharge device 1.

As a result, current is supplied to the electromagnetic coil 26 of the three-way switching solenoid valve 16, 17, 18, and the three-way switching solenoid valve 16.1
7.18 changes from the oil drain state to the oil supply state.

Pump 8 continues its operation and the refueling cycle begins.

Address flip-flop 66 is then set.

When the address flip-flop 66 is sent, a micro order ■ is generated.

The micro-order ■ is applied to the input terminal of the AND gate 11.

AND gate 71 is register 1 that counts the actual amount of refueling.
This is provided to add 15.6 (C, C,) to the contents of 2 each time a pulse from the flow meter 11 of the supply/discharge device 1 described above arrives.

13 is a pulse from the flowmeter 11.
, is a circuit that outputs a signal having the time width required for the above addition every time it receives a pulse PP, and its output signal is applied to one input terminal of the AND gate 11.

74 is the oil amount corresponding to one pulse PP, that is, 15
．． 6 (C, C0), and its output terminal is connected to one input terminal of the AND gate 71.
There is.

The output of AND gate 11 is given to one input of adder 75.

On the other hand, the other input of the adder 75 is given the contents of the register 72 that counts the actual amount of refueling.

The output of adder 75 is also input to register 12.

As is clear from the above configuration, each time a pulse from the flow meter 11 arrives, the contents of the register 12 are 15.6 (C, C, .
) is added.

The highest digit of the register 12 corresponds to the thousands digit when expressed in COCl, and the lowest digit corresponds to the box below the decimal point.

A coincidence detection circuit 16 detects coincidence between the upper two digits of the register 72 and the desired oil supply amount, and outputs a coincidence detection output signal J when the two contents match.

This output signal J is applied to one input of an OR gate 77 provided in the control order control circuit 64.

The output of the OR game □ door 7 is given to one input of the AND gate 18.

The output from the address flip-flop 66 is applied to the other input of the AND gate 78, and the output of the AND gate 78 is applied to the address flip-flop 67.

Further, the output of the OR gate 77 is applied to one input of an AND gate 79 via an inverter.

The other input of this AND gate 79 is given an output of 1 from the address flip-flop 66, and the output of the AND gate 79 is fed back to the address flip-flop 66.

As is clear from the above configuration, while the content (upper two digits) of the register 72 that counts the actual amount of oil supply is smaller than the input desired amount of oil supply, the coincidence detection circuit 76 outputs the “coincidence detection output signal J”. Therefore, the output of the OR gate 77 is "
0".

Therefore, the AND gate 79 is opened, and each time the pulse PP from the flow meter 11 arrives, the oil supply amount counting register 72. Add 15.6 (C, C0) to the contents of .

. When the contents of the register 72 (upper two digits) match the desired refueling amount, the coincidence detection circuit 76 outputs a coincidence detection output signal J, and the output of the OR gate 77 becomes "1".
becomes.

Accordingly, AND gate 78 is opened and address flip-flop 6T is set.

When the address flip-flop 67 is set, M:I:11 qua order ■ is output.

The microphone stand: data is applied to the reset input terminal of the flip-flop 59 via an OR gate 80.

Therefore, the flip-flop 59 by micro order
is reset, the derivation of the drive signal to the first pump 8 is stopped, and the pump 8 is stopped.

That is, the refueling cycle ends.

Further, the micro order (3) is applied to the reset input terminal of the flip-flop 60 for switching between oil drain and oil supply.

Therefore, it depends on the micro-order degree that the flip-frog 6
0 is reset, and based on that, the three-way switching solenoid valve 16,
17 and 18 are switched to the oil drain state.

Further, based on the micro order (2), the unit price of oil set by the unit price setting switch 5 is introduced into the oil unit price storage register.

In the figure, ℃5 is a switch for setting the unit price, and 811.
812, 813, and 814 are encoders that output numerical values set by the unit price setting switches as coded signals.

821, 822, 823, and 824 are AND gates each having one input as the output of the encoder described above, and the other input being given micro-order ■.

The outputs of the AND gates 821, 822, 823, and 824 are respectively input to the corresponding digits of the register 83 for storing the unit price for each file.

As is clear from the above configuration, when a micro order ■ occurs, based on the set value of unit price setting switch 1 and step 5 (encoder output is ant game) 821°...824
The data is input to the oil unit price storage register 83 via.

□Next, address flip-flop 68 is set.

When the address flip-flop 68 is set, the micro order ■ is output.

The micro order ■ is input to the multiplication circuit 84, which multiplies the oil supply amount (the contents of the upper two digits of the register 72 that counts the actual oil supply amount) by 1 and the oil unit price (the contents of the oil unit price storage register 83). It is executed and the result is introduced into the payment amount storage register 85.

-Address flip-flop 69 is set as the primary address.

When the address flip-flop 69 is set, the micro order (2) is output.

, ・X micro order ■ is manually inputted by the print control circuit 86.
As a result, a driving signal is output to the printing device I, and the amount of oil to be supplied, the unit price, and the payment amount are sequentially printed by the printing device 1 and output as a slip.

When printing is completed, the print control circuit 86 outputs a print end signal P.

Output. The print end signal is input to the timer circuit 87, and the timer circuit 87 outputs an output signal for 2 seconds.

A timer circuit 88 is connected to the timer circuit 81 and outputs an output signal for two seconds after the output of the timer circuit 81 changes from "1" to "10".

Furthermore, 89 is connected to the timer circuit 88, and the timer circuit 88
This is a pulse generating circuit that outputs a pulse signal every time the output of the pulse signal changes from "L" to "0".

Next, parts related to the display device 6 will be explained again.

Reference numeral 90 has a set input terminal to which the output signal of the timing signal generation circuit 47 described above is applied, and the timer circuit 87
is a flip-flop whose output signal is applied to its reset input terminal.

The flip-flop 900 set output terminal is connected to one input terminal of AND gate 91.

The other input of the AND gate 91 receives signals from the desired oil supply amount storage register 46 and the decimal point position storage register 48 described above.

Reference numeral 92 is an AND gate to which the output signal of the timer circuit 87 is applied to one input, and the signal from the oil unit price storage register 83 described above is applied to the other input.

Furthermore, 93 is an AND gate to which the output signal of the timer circuit 88 is applied to one input, and the signal from the payment amount storage register 85 is applied to the other input.

The outputs of the AND gates 91, 92, and 93 are wired-OR coupled and input to the display drive circuit 94.

The display device 6 is driven by the output signal of the display drive circuit 94.

□As is clear from the above configuration, the flip-flop 90 remains in the set state until the output signal of the timer circuit 87 is output after the numerical key operation for manually inputting the desired refueling amount.

Therefore, during this time, the AND gate 91 is open and the desired amount of refueling is displayed on the display device 6.

When the output signal of the timer circuit 87 is output, the flip-flop 9
0 is reset and AND gate 91 is closed, and AND gate 92 is opened for 2 seconds.

Therefore, the oil unit price is displayed on the display device 6 for 2 seconds.

When the output of the timer circuit 87 turns off (TO'') after 2 seconds, the timer circuit 88 then outputs an output signal for 2 seconds.

Accordingly, an AND gate 93 is opened in place of the AND gate 92, and the payment amount is displayed on the display device 6 for two seconds.

When the output of the timer circuit 88 is turned off after two seconds have elapsed, the pulse generating circuit 89 generates a pulse.

The output of the pulse generation circuit 89 is applied to one input of an AND gate 95 provided in the control order control circuit 64.

The output signal of the address flip-flop 69 is applied to the other input of the AND gate 95.

The output of AND gate 95 is also applied to address flip-flop 70.

When the output of the timer circuit 88 is turned off, the display of the payment amount ends, and the pulse generating circuit 89 outputs a single pulse.

Therefore, AND gate 95 outputs an output signal and address flip-flop 70 is set.

When address free and horn flop 70 is set, micro order (2) occurs.

Micro order (2) is a circuit clear signal and is applied to the desired oil supply amount storage register 46 and decimal point register 48 via an OR gate 100.

Also, micro order ■ is the register 7 for storing the actual oil supply amount.
2. It is also given to the oil unit price storage register 83.

Accordingly, each of the above registers is cleared by the micro order (2) and returns to the initial state.

Note that 103 is a power switch, and 104 is an auto-clear circuit that automatically outputs a clear signal, ie, micro-order (2), based on the power switch 103 being turned on.

Accordingly, the circuit is also automatically cleared when the power switch 103 is turned on.

Further, in this embodiment, a buzzer sounds while the oil unit price payment amount is displayed to notify the customer that a series of operations for changing the engine oil have been completed.

That is, a φOR gate 96 is provided that uses the outputs of the timer circuits 87 and 88 as their two-manpower, and the output of the OR gate 96 is configured to control a buzzer drive circuit 98 that drives a buzzer 97. While the 88 is outputting the output signal (that is, while the oil unit price or payment amount is being displayed), the buzzer will sound to notify the customer that the series of tasks for changing the engine oil has been completed. There is.

[Supplementary explanation regarding the key human-powered device 4] The key human-powered device 4 includes a numeric key 4 for entering the desired amount of refueling.
4. In addition to the start key 52 that starts the operation of the supply/discharge device 1, there is also a clear entry key 99 for correcting the contents of the entered number, and an emergency key for stopping the operation of the supply/discharge device 1 in the event of an accident, etc. A key 102 is provided.

First, the clear entry key 99 will be explained.

The key signal from the clear entry key 99 is given as a clear signal to the desired oil supply amount storage register 46 and the decimal point register 48 via the OR gate 100, and is also given to the decimal point flip-frog 4 via the OR gate 101.
9 as a reset signal.

Therefore, by pressing the clear entry key 99, the two registers 46 and 48 are cleared and the decimal point flip-flop 49 is reset, allowing manual operation again.

Next, the emergency key 102 will be explained. emergency key 1
The key signal from 02 is sent to the register 4 for storing the desired oil supply amount via the OR gate 100 similar to the clear entry 99.
6. The signal is applied as a clear signal to the decimal point register 48, and is also applied as a reset signal to the decimal point flip-flop 49 via the OR gate 101.

Furthermore, the key signal of the emergency key 102.1 is applied to the reset input terminal of the flip-flop 59 via the OR gate 80, and then to one input terminal of the OR gate 71 provided in the control sequence control circuit 64. It is given and shines.

Therefore, if the emergency key 102 is pressed during oil draining, the desired oil supply amount storage register 46 and decimal point register 48 are cleared, the decimal point flip-flop 49 is reset, and the flip-flop 59 is cleared and set to derive the pump drive signal. will stop, the pump will stop operating, and the oil will stop draining.

On the other hand, if the emergency key 102 is pressed during refueling, the two registers 46 and 48 are cleared, the decimal point flip-flop 49 is set, the pump stops operating, and refueling is stopped.

Furthermore, the control order: the output of the OR game 117 provided in the control circuit 64 becomes "1", the address clip-flop 67 is set regardless of the output of the coincidence detection circuit 76, and the address flip-flops 6B, 69 . 70 is set and the same operations as described above are performed.

That is, the amount of oil supplied until the emergency key 102 is pressed is multiplied by the unit price to determine the amount to be paid, which is then printed and displayed, and the process ends.

Explanation regarding pupil oil indicator and refueling indicator In this embodiment, an indicator is provided to indicate whether oil is being drained or refueling, and is configured to display whether the device is in the oil drain cycle or refueling. There is.

That is, an AND gate ios is provided, which uses the set output of the bonder 1 drive fly-nog flock 590 and the reset output of the oil drain/refueling switching f-7 flag 60, and by the output of this AND gate 105, It is configured to control the lighting of a lamp 1060 constituting an oil draining indicator, and is configured to turn on the lamp 106 during oil draining to indicate that oil is being drained.

, and a flip-flop 60 for oil drain/oil supply switching.
Depending on the output, a lamp 10 that constitutes a refueling indicator
The lamp 107 is turned on during refueling to indicate that the lamp 107 is being refueled.

Instead of providing the above-mentioned AND gate 105, a flip-flop is provided which is set by the output of the timing signal generation circuit 47 and reset by the output of the drain/oil completion detection signal output circuit 62, and the set output of this laritub flop is used to indicate the oil draining status. It may also be configured to control the lighting of the lamp 1060 that constitutes the.

In the above embodiment, the supply/discharge device cannot be operated even if the start key is pressed without the desired fuel supply amount being input.

Moreover, it was not possible to make the oil drain only.

To improve this point, the AND gate 58 is not provided and the key signal from the start key 52 is sent directly to the flip-flop 59.
It may be introduced to the 0 set input terminal.

When the start key 52 is pressed without inputting the refueling amount, the coincidence detection circuit 76 outputs a coincidence detection output signal when the call amount shifts from the oil draining cycle to the refueling cycle, and the process essentially ends with refueling O.

Further, an OR gate is provided which uses the output of the NOR gate 57 and the set output of the decimal point flip-flop, and the output signal of this OR gate is applied to one input of the ant game 158 in place of the output signal of the NOR gate 57. It may be configured as follows.

In this case, press the decimal point key 441 and press the start key 52.
By pressing , you can only drain the oil.

Further, a flip-flop is provided, to which the output of the timing signal generation circuit 47 is applied to its set input terminal, and the micro order (2) is applied to its reset input terminal, and the opening and closing of the gates 91, 92, and 93 described above are controlled by the set output. With this configuration, the display is displayed from the input of the desired refueling amount to the generation of the micro order (2), and thereafter the display is turned off during the standby state, so that power consumption can be reduced.

The idea of the present invention is applicable not only to changing the engine oil of a car (for example, to injecting fuel oil).

In this case, the oil drain function is essential, but in addition to the flow meter, it is necessary to add a function to detect when the tank is full and to control the temperature.

As explained in detail above, the automatic oil change machine of the present invention is configured to perform engine oil change, which has conventionally been a very troublesome task, under the control of a digital control device. This makes it possible to greatly automate engine oil replacement work.

In other words, according to the automatic oil change machine of the present invention, the customer or the service person at the stand simply inserts the supply/discharge nozzle of the supply/discharge device into the tipstick hole of the engine and inputs the desired amount of oil, and all subsequent operations are automatically performed. It is possible to shorten work time and eliminate labor shortages.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention, Fig. 2 is a flowchart showing the operations of the customer (user) in the embodiment and the automatic oil change machine of the embodiment, and Fig. 3 4 is a block diagram showing the detailed structure of the same embodiment, and FIG. 4 is a partially sectional block diagram showing the structure of a three-way switching solenoid valve used in the same embodiment. Code, 1: supply/discharge device, 2 digital control device, 4 single power device, 10: loading sensor, 1 flow meter,
12 oil tank, 15: new oil tank, 44: numeric key, 46: register for storing desired oil supply amount, 48:, numeral point register, 52 start key, 59: flip-flop, 60: oil drain/refueling switch 62: Oil drain completion detection signal output circuit, 72: Oil supply amount counting register, 76: Match detection circuit, 441: Decimal point key.

Claims (1)

[Scope of Claims] 1. A supply/discharge device including a means for detecting completion of oil draining and a flowmeter for counting the amount of oil supplied from a new oil tank to an oil tank of an automobile; and controlling the supply/discharge device. □ Desired oil supply amount input means; and □ Desired oil supply amount storage means for storing the desired oil supply amount inputted by the desired oil supply amount input means. means for starting an oil drain cycle of the supply/discharge device; means for detecting completion of oil drain based on an output signal from the oil drain completion detection means of the supply/discharge device; A means for deriving a signal for switching from an oil drain cycle to an oil supply cycle in the supply/discharge device, and based on the signal from the flow meter of the supply/discharge device, counts the amount of oil supplied from the new oil tank to the oil tank of the automobile. a coincidence detection means for detecting coincidence between the contents of the desired oil quantity storage means and the oil quantity counting means, and a signal for terminating the oil supply cycle based on the coincidence detection output of the coincidence detection means. An automatic oil exchange machine characterized by comprising means for leading the oil to a supply/discharge device.