TH3864C3 - The reader interprets trouble codes of the vehicle system. - Google Patents

Abstract

This invented automotive fault code reader is designed for permanent installation in vehicles. It allows drivers to read fault codes from a two-digit, seven-segment (7-segment) display in decimal format. When a problem occurs in the vehicle's systems, the code reader displays the error code, allowing the user to make informed decisions about troubleshooting. This enhances driver confidence and safety. The reader works by detecting the time intervals between flashing indicator lights, which correspond to the fault code. It connects to signals from the vehicle's instrument panel, which in turn are sent from the Engine Control Unit (ECU). The user can select one of four fault code groups with a single button press. Five LEDs indicate the selected input channel. The system utilizes photo couplers and open collector couplers for signal linking between input and output devices, ensuring reliable operation. The circuit is designed entirely digitally according to the specified block diagram. The circuitry is integrated and packaged into a pre-assembled circuit board mounted on a housing that is typically installed in vehicles with engine control units.

Claims (5)

1. The diagnostic trouble code reader of the vehicle system consists of a housing (1), a rectangular closed box. The front of the case (1) contains the display (23), it is a two-digit seven-segment (7-segment) display for the vehicle trouble code numbers and a push button (7) to select the code channel. Problem with LED lamp (2) indicates the status of the active trouble code channel selection. On the side of the housing (1) there is a connection port (3) for connecting the unit to the engine control unit (ECU) (5) and the flashing lamp group on the car's instrument panel (6) via the wire. Sign (4) has special characteristics: The interior of the problem code reader of the aforementioned vehicle system consists of - Selective code generator circuit (9) which receives the signal pressing the pushbutton (7) to select the trouble code receiver circuit. Of pulses to be correct and count the number of pulses, a count of five decade counter (Decade Counter) to count the number of pulses according to the number of presses of the keypad (7) by the press signal of such a button Will be divided into three parts The first signal will be sent and displayed on the selected channel viewer. To display the channel selection position, trouble code with a second (2) LED lamp. It is sent to the selector switch (SW1) (10) which drives the selection code generator circuit (9) to pull the logic level of the selected channel output to ground. And sent as an output, connected to the Engine Control Unit (ECU) (5) so that the engine control unit sends back a flashing code signal to the dial of the reader corresponding to the selected transponder and the third signal. It is sent to the input channel selection switch (SW2) (11) to select to receive a trouble code from the trouble code channel, which is connected from the lamp to the instrument panel of the vehicle (Measurement Panel) (6) by a code signal. Selected issues are imported via Photo Couples to separate the electrical system between the engine control unit and the trouble code reader. 2. The reader interprets trouble codes of vehicle systems. According to claim 1, the signal received from the input channel selection switch (SW2) (11) is divided into two. The first part is sent to the Missing Pulse Detector circuit (12) and the other part is sent to the Missing Pulse Detector (12) binary counter (12). 3. The reader interprets the problem code signal of the vehicle system according to the 1 or 2 claim, where the Missing Pulse Detector (12) circuit detects the gap between the pulses. It is used to differentiate between the first primary trouble code signal and the second primary trouble code signal. The first major trouble code signal is the output obtained by detecting the width of the gap between pulses (Space Width) greater than 1.2 s, which is used to indicate the end of the main pulse count at TWO - The second (14) division circuit serves to block the signal of the first digit trouble code signal while the second digit trouble code signal is active and is cleared to normal at the end of the second digit pulse count to Get the state ready for first major trouble code count return in the next cycle. The signal output from the division two (14) is sent to the excitation pulse number one (15), which is characterized by the monostable circuit - the number one excitation pulse circuit. (15) act to encourage Registers number one (19) circuit, which is four bits. Receives pulse counting data from a four-bit binary counter (4-Bit Binary Counter) (13) temporarily held. Likewise, when the pulse gap detection circuit (12) detects a wider pulse interval than specified. The second main trouble code signal is generated. This signal is sent to the excitation pulse circuit number two (16) - the excitation pulse circuit number two (16), which triggers the number two registers. Two (20) receive pulse count data from a four-bit binary counter (4-Bit Binary Counter) (13) temporarily held. When the second major trouble code signal returns to normal Will mean the end of the pulse process set The first and second digit trouble code signals are sent to the four-bit bini-code to seven-segment (BCD to 7-segment) circuit (21,22), converting data from registers one and Two (19,20) are displayed at the display circuit (23) and will hold that value until the end of the next pulse sequence and During the time when one or two (15,16) number excitation pulse circuits operate, one or two number registers (19,20) take turns taking values from a four-bit binary counter (4-Bit Binary Counter). (13) comes to rest.At the same time, the signal of one or two number of excitation pulse circuits (15,16) is transmitted through the signal number one (17) and delayed (18), then Sent to clear the four-bit binary counter (4-Bit Binary Counter) (13) after one or two number registers (19,20) have been taken to hold the binary value from the counter. 4. The reader interprets trouble code signals for any vehicle system according to one of the 1-3 qualifications where the pushbutton (7) is used to control the input selection by generating five input channel codes. The first four codes are used to select all four inputs. Another code that is selected is set to standby (Standby) while not in use. 5. The machine reads and interprets the problem code of the vehicle system according to the rights 1-4 which one The cable (4) connection to the trouble code reader is connected to the input signal (6) four independent channels, that is, one pair of wires for a total of four pairs. The input signal (5) has four channels, with four wires. And the other cable is a common ground wire. The twelve-volt power supply uses two cables and all of the cables mentioned are tied into one patch cable. Connect to the machine to read and interpret trouble codes of the car system. Through a single port (3)