KR940000898Y1 - Microcomputer-base control device for starting an automobile engine - Google Patents

Abstract

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Description

Microcomputer-based controls for starting the car engine

1 is a schematic block diagram of a preferred embodiment of a microcomputer based control device used to start an automobile engine according to the present invention.

2 is a schematic circuit diagram of a preferred embodiment.

3 is a schematic view of a preferred embodiment when the keyboard and display unit are mounted on the handle of the vehicle.

* Explanation of symbols for main parts of the drawings

10: microcomputer unit 20: memory unit

30: display unit 40: digital keyboard unit

The present invention relates to a control device based on a microcomputer, in particular a control device based on a microcomputer, for starting an automobile engine.

Recently, keys are used to operate the ignition switch to electrically connect the vehicle battery to the ignition system and the starter motor.

However, using keys with this function has some disadvantages.

1. A person needs to hold a key.

2. If the key is damaged or improperly made, the startup process will be difficult.

3. You may have forgotten or lost your place.

Therefore, the main object of the present invention is to provide a microcomputer-based control device that does not use a key to start an automobile engine, and overcomes the disadvantages commonly associated with the prior art.

Thus, a preferred embodiment of the microcomputer-based control device of this disclosure is an electrically erasable programmable read-only memory (EEPROM) means for storing desired digital code, a digital data signal installed on a handle and corresponding to a selected keyboard input code. An output, a digital keyboard means used to generate a plurality of digital command signal outputs, a display means for displaying a keyboard input code, and a microcomputer means for comparing the digital code and digital data signal output.

The microcomputer means activates the first switching means for connecting the vehicle battery to the power supply system of the vehicle when the digital signal output matches the digital code, and upon occurrence of the first output of the digital command signal outputs, the digital data signal output is coupled with the digital code. When coinciding the second switching means for supplying current to the automobile engine is activated.

Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings.

According to FIG. 1 and FIG. 2, a preferred embodiment of the microcomputer based control apparatus according to the present invention is used in combination with an automobile engine, and the preferred embodiment is a microcomputer unit 10, a memory unit 20, The display unit 30, the digital keyboard unit 40, the power supply switching means 50, and the vehicle engine ignition switching means 60 are constituted.

The microcomputer unit 10 has four 8-bit bidirectional I / O ports, that is, port (A) [line (PA0) to (PA7), port (B) [line (PB0) to (PB7)], port. A CDP6805G2 8-bit microcomputer having (C) [line (PC0) to (PC7)] and port (D) (line (PDO) to (PD7)) is preferred. The microcomputer unit 10 also has an internal 8-bit timer and internal ROM for permanent program storage.

The microcomputer unit 10 is connected to the memory unit 20, the display unit 30, the keyboard unit 40, the power supply switching means 50, and the vehicle engine ignition switching means 60. The microcomputer unit 10 compares the preset code stored in the memory unit 20 with the keyboard input code. If the two codes match, a corresponding output signal is generated at the I / O port.

The memory unit 20 is a nonvolatile memory that can be programmed in the circuit. In a preferred embodiment, the memory unit 20 is an EEPROM chip AT28HC16 / L. The memory unit 20 includes data lines D0 to D7 connected to the I / O port C of the microcomputer unit 10 and I / O lines PD0 to PD7 of the microcomputer unit 10. ) And address lines A0 to A2 connected to the I / O lines PD0 to PD2 of the microcomputer unit 10.

The write enable (R / W) pin of the memory unit 20 is connected to the I / O line PD3 of the microcomputer unit.

The memory unit 30 is preprogrammed and includes a code writing routine. When it is desired to permanently store a desired code in the memory unit 20, the microcomputer unit 10 generates an input signal to the memory unit 20 to erase the code writing routine. Therefore, the desired code is permanently stored in the memory unit 20 and cannot be replaced.

The display unit 30 is a four-segment light-emitting diode (LED) display 32 driven by the display driver 31 and the display driver 31 connected to the I / O port B of the microcomputer unit 10. ). The microcomputer unit 10 receives the digital equivalent of the keyboard input code and decodes it into a suitable seven-segment binary form, causing the desired segment of the LED display 32 to glow to display the keyboard input code. The display unit 30 further includes a red red LED indicator LO and a green engine operation LED indicator L1.

The keyboard unit 40 is a conventional pushbutton keypad having 16 keys arranged in a 4x4 matrix. The keyboard unit 40 is connected to the I / O port A of the microcomputer unit 10 and used to input keyboard input codes and desired commands to the microcomputer unit 10. The functions of each key on the push button keyboard are as follows.

1. Keys (0) to (9) are numeric data keys. The keyboard input code is selected from the combination of numeric data keys (0) to (9).

2. The (SET) key is pressed to notify the microcomputer unit 10 that data should be transferred to the microcomputer unit 10.

3. The (GO) key is a function key used in combination with other function keys.

4. The (PARK) key is pressed simultaneously with the (GO) key to stop displaying the car's signal.

5. The (AVV) key is pressed before pressing the (GO) key to start the engine.

6. The (RESET) key is pressed before pressing the (GO) key to switch off the automotive power system.

7. The (*) key is pressed only once, that is, when permanently storing the desired code in the memory unit 20.

According to FIG. 3, the display unit 30 and the keyboard unit 40 can be installed on the handle of the vehicle.

When the preferred embodiment is installed in the automobile factory, the temporary code is stored in the memory unit 20. To save the temporary code, press the (SET) key and then the (GO) key and the selected numeric keys (eg keys (1), (2), (3) and (4)). The (GO) key is pressed once more to instruct the microcomputer unit 10 to store the temporary code in the memory unit 20.

The step for permanently setting a desired code in the memory unit 20 is performed by the car owner and is substantially similar to the setting operation in the factory described above. An additional step of pressing the (*) key is executed to permanently store the desired code in the memory unit 20.

The power source switching means 50 is composed of a resistor pair 51, a first switch transistor 52, and a first relay 53. One terminal end of the register pair 51 is connected to the I / O line PD4 of the microcomputer unit 10.

The other terminal end of the resistor pair 51 is connected to the collector terminal of the first switching transistor 52.

The normal open contacts of the first relay 53 are connected to the vehicle battery and the vehicle power system, respectively. The microcomputer unit 10 includes a preset code and a keyboard input code stored in the memory unit 20.

When the two codes match, a high logic state is detected at the I / O line PD4, whereby the first switching transistor 52 is conductive. When the first switching transistor 52 is in a conductive state, current flows through the magnetic coil of the first relay 53, thereby closing the normal opening contacts of the first relay 53 so that the automotive battery is connected to the automotive power system. do. This enables the operation of traffic lights, windshield wipers and other electrically operated parts of the car and is similar to putting the key-operated start switch in the "ON" state.

LED indicator LO is connected to voltage source V ₊ and resistor pair 51. The LED indicator LO stops lighting every time the first switching transistor 52 is in the conductive state. Pressing the (RESET) key and the (GO) key disconnects the vehicle battery and the vehicle power system, whereby the LED indicator LO is incandescent.

The power switching means 50 also includes a buffer device 54 having one terminal end connected to the I / O line PD4 and a second switching transistor 55 having a base terminal connected to the other terminal end of the buffer device 54. ) And a second relay 56.

Two ends of the magnetic coil of the second relay 56 are connected to the voltage source V ₊ and the collector terminal of the second switching transistor 55. When the I / O line PD4 is in the high logic state, the second relay 56 enables the movement of the handle 5 without locking the electromagnet steering handle fixture by the conduction of the second switching transistor 55. .

The vehicle engine ignition switching means 60 comprises a resistor 61, a third switching transistor 62 and a third relay 63.

One terminal end of the register 61 is connected to the I / O line PD5 of the microcomputer unit 10. The base terminal of the third switching transistor 62 is connected to the other terminal end of the register 61. Two stages of the magnetic coil of the third relay 63 are connected to the voltage source V ₊ and the collector terminal of the third switching transistor 62. The movable contact of the third relay 63 is connected to the starter motor of the vehicle.

When the automotive battery and the automotive power system are connected, the (AW) and (GO) keys are pressed simultaneously, and the third switching transistor 62 is changed by changing the logic state of the I / O line PD5 to the high logic state for a predetermined period. ) Is challenged.

Next, current is supplied to the starter motor to start the automobile engine.

The preferred embodiment further comprises vehicle signal indication switching means 70 and vehicle alarm sound switching device 80 connected to I / O lines PD6 and PD7 of microcomputer unit 10, respectively.

The configuration of the vehicle signal display switching means 70 and the vehicle alarm sound switching device 80 is substantially similar to that of the vehicle engine ignition switching means 60 and thus will not be described in detail.

In summary, the operation of the preferred embodiment is as follows.

1. While the LED indicator LO is initially on, the LED indicator L1 is off. The car power system is not connected to the car battery in this state.

2. When the keyboard input code matches the preset code of the memory unit 20, the power switch 50 connects the car battery to the car power system so that the LED indicator L1 is on and the LED indicator LO is off. .

3. When the LED indicator L1 is on and the (AW) and (GO) keys are pressed at the same time, current is supplied to the vehicle engine to initiate the same operation.

4. To turn off the engine, the (RESET) key is pressed to disconnect the car battery from the car power system. LED indicator L0 is once more on while LED indicator L1 is off.

While the invention has been described in terms of the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments and that various arrangements fall within the scope and scope of the broadest description so as to encompass the same arrangement as all such modifications. Applicable

Claims (10)

A control device coupled to an automobile having an automotive engine, an automotive battery, an automotive power system, and a steering wheel (S), comprising: non-volatile memory means (20) for storing an appropriate digital code, multiple digital command signal outputs and selected keyboard inputs Digital keyboard means 40 for generating a digital data signal output corresponding to a code, comparing means 10 for comparing the digital code with the digital data signal output, and when the digital data coral output matches the digital code A first switching means 50 for connecting the vehicle battery to the vehicle power system and a first of the digital command signal outputs for supplying current to the automobile engine when the digital data signal output matches the digital code; A second switching means (60) operated by an output Control apparatus for a. 2. The memory device of claim 1, wherein the memory unit 20 comprises an EEPROM unit, and wherein the control device further comprises storage means for storing the digital data signal output as the digital code in the memory means 20. Control device characterized in that. The control apparatus according to claim 2, wherein said EEPROM unit (20) is an AT28HC16 / L integrated circuit chip. 3. A storage device as claimed in claim 2, characterized in that said storage means comprises permanent storage means operated by a second output of said digital command signal outputs for permanently storing said digital code in said memory means (20). Control unit. 3. A control device according to claim 2, further comprising display means (30) for displaying said keyboard input code. 6. The apparatus according to claim 5, further comprising decoding means for decoding said digital data signal output into a seven segment binary code, wherein said display means (30) emits a plurality of seven segment light activated by said seven segment binary code. Control device comprising a diode display means (32). 3. Control device according to claim 2, characterized in that the comparing means (10) is coupled to a CDP6805G2 8-bit microcomputer. 3. The register means (51) according to claim 2, wherein the first switching means includes a voltage (V ₊ ), a register means (51) having one terminal end connected to the comparing means (10), and another terminal end of the register means (51). A transistor 52 having a base terminal connected thereto and a relay 53 having a magnetic coil connected to the voltage source V ₊ and a collector terminal of the transistor 52 and a contact terminal connected to the vehicle battery and the vehicle power supply system; And the transistor (52) operates the relay (53) and connects the vehicle battery to the vehicle power supply system when the digital data signal output coincides with the digital code. A voltage source (V ₊ ), an electromagnet holding device provided on the handle (S) to prevent unauthorized movement of the handle (S), and a base terminal connected to the comparing means (10). And a relay having a transistor 55 and a magnetic coil connected to the voltage source V ₊ and a collector terminal of the transistor 55 and a contact terminal connected to the electromagnet fixing device, wherein the digital data signal output is the dodge. The control device causes the transistor (55) to operate the relay (56) and not lock the electromagnet fixture when matched with a decode. 6. A control device according to claim 5, wherein said digital keyboard means (40) and said display means (30) are mounted on said handle (S).