CN202771253U - ABS ECU diagnostic apparatus with hardware filtering - Google Patents

Abstract

The present utility model relates to the automobile electronic technology field and provides an ABS ECU diagnostic apparatus with hardware filtering. The diagnostic apparatus is provided with a PC RS 232 interface and a KLINE power supply and communication interface, a master control circuit PCB is arranged inside, a filtering circuit is arranged between a KLINE to UART circuit and a TTL to UART circuit on the master control circuit PCB; and the filtering circuit is used for filtering sent signals fed back by a KLINE bus of the KLINE to UART circuit. In the diagnostic apparatus, through adding hardware filtering, ineffective feedback data of the bus can be directly filtered, software filtering processing can be saved, software workload can be reduced, and system efficiency can be increased.

Description

A kind of ABS ECU diagnostic equipment with hardware filtering

Technical field

The utility model relates to technical field of automotive electronics, specifically, is a kind of ABS ECU diagnostic equipment with hardware filtering.

Background technology

ABS (Antilock brake system anti-lock braking system) and ECU (Electric control unit electronic control unit) are the important system in the automotive electronic technology.ABS ECU diagnostic equipment is one of important tool of ECU and PC, is mainly used in to ABS ECU brush journey, diagnoses, vacuumizes filling brake fluid, pipeline exhaust, upgrades the ABS control algolithm, optimizes its serviceability.Its principle of work is to be converted to the KLINE bus signals and ABS ECU communicates by the RS232 signal with computer.But present diagnostic equipment is not with the filtering of KLINE bus feedback, can only come filtering by software, all be the process patent of software filtering such as the patent of the patent of publication number CN200810220151.2 " a kind of software implementation method of the data link layer based on KWP2000 " and publication number CN201110156800.9 " based on the ECU debugging software of the PC end of K line and KWP2000 agreement "; And the patent of publication number CN200810040357.7 " with the Kline RS 232 circuit of anti-reverse function " only limits to level shifting circuit, does not have the hardware filtering function, can not directly control KLINE bus high-low level time.

Summary of the invention

The purpose of this utility model is in order to overcome deficiency of the prior art, a kind of ABS ECU diagnostic equipment with hardware filtering to be provided.This diagnostic equipment, is save software filtering and is processed the direct filtering of invalid feedback data of bus by increasing hardware filtering, reduces the software work amount with this, increases system effectiveness.

To achieve these goals, the utility model is to be achieved by following technical solution:

A kind of ABS ECU diagnostic equipment with hardware filtering, be provided with PC RS232 interface and KLINE power supply and order wire interface, inside is equipped with the governor circuit pcb board, and the KLINE on the described governor circuit pcb board turns UART circuit and TTL and turns between the UART circuit and be provided with filtering circuit; Described filtering circuit carries out filtering with the transmitted signal that described KLINE turns the KLINE bus feedback in the UART circuit.

Input_1A pin and Input_1B pin are arranged on the chip of described filtering circuit, and output pin Output_1;

Described Input_1A pin: be connected to described KLINE and turn the TXD2 of UART circuit and the TXD1 that described TTL turns the UART circuit;

Described Input_1B pin: with turn the UART circuit through described KLINE after the RXD2 of 5V be connected;

Described output pin Output_1: the RXD1 that turns the UART circuit with described TTL is connected.

Described TTL turns the UART circuit 12V signal of computer is converted to the 5V signal, is used for the signal transmission; Be about to the RXD0 of PC end 12V, the TXD0 signal is converted to the RXD1 of 5V, the TXD1 signal.

Described KLINE turns the UART circuit described KLINE signal is converted to the 5V signal, is used for the signal transmission.

Compared to existing technology, the beneficial effect that brings of technical solutions of the utility model is:

1, increases the hardware filtering circuit, need not software filtering.

2, increase KLINE bus initialization level control function, can directly control KLINE bus high-low level time by computer.

3, baud rate is adjustable, and the highest support 512000bps/s greatly reduces the ECU brush journey time.

Description of drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the circuit theory diagrams of the governor circuit pcb board among Fig. 1;

Fig. 3 is that the KLINE among Fig. 2 turns the UART circuit diagram;

Fig. 4 is that the TTL among Fig. 2 turns the UART circuit diagram;

Fig. 5 is the filtering circuit figure among Fig. 2;

Fig. 6 is power-supplying circuit figure;

Fig. 7 is test circuit figure.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:

As scheme shown in the l, the ABS ECU diagnostic equipment with hardware filtering that the utility model is novel, inside is equipped with governor circuit pcb board 1, and the two ends of governor circuit pcb board 1 are respectively PC RS232 interface 2 and KLINE power supply and order wire interface 3; As shown in Figure 2, the KLINE on the governor circuit pcb board l turns UART circuit and TTL and turns between the UART circuit and be provided with filtering circuit; The effect of filtering circuit is that the transmitted signal that KLINE turns the KLINE bus feedback in the UART circuit is carried out filtering.

The visible Fig. 3 of the amplification circuit diagram of each circuit is to shown in Figure 7.Among Fig. 5, the Input_1A pin on the chip of filtering circuit is connected to Fig. 3 KLINE and turns the TXD2 of UART circuit and the TXDl that Fig. 4 TTL turns the UART circuit; The Input_1B pin with turn the UART circuit through Fig. 3 KLINE after the RXD2 of 5V be connected; Output pin OutDut_1 is connected with the RXDl that Fig. 4 TTL turns the UART circuit.

Fig. 3 KLINE turns the UART circuit described KLINE signal is converted to the 5V signal, is used for the signal transmission.

Fig. 4 TTL turns the UART circuit 12V signal of computer is converted to the 5V signal, is used for the signal transmission; Be about to the RXDO of PC end 12V, the TXDO signal is converted to the RXDl of 5V, the TXDl signal.

Fig. 6 is power-supplying circuit figure, transfers 12V voltage to the 5V power supply;

Fig. 7 is test circuit figure, the test ground signalling.

At last, it is also noted that what more than enumerate only is a specific embodiment of the present utility model.Obviously, the utility model can also have many distortion, and all distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection domain of the present utility model.

Claims (4)

1. ABS ECU diagnostic equipment with hardware filtering, be provided with PC RS232 interface (2) and KLINE power supply and order wire interface (3), inside is equipped with governor circuit pcb board (1), it is characterized in that the KLINE on the described governor circuit pcb board (1) turns UART circuit and TTL and turns between the UART circuit and be provided with filtering circuit; Described filtering circuit carries out filtering with the transmitted signal that described KLINE turns the KLINE bus feedback in the UART circuit.

2. the ABS ECU diagnostic equipment with hardware filtering according to claim 1 is characterized in that Input_1A pin and Input_1B pin are arranged on the chip of described filtering circuit, and output pin Output_1;

Described Input_1A pin: be connected to described KLINE and turn the TXD2 of UART circuit and the TXD1 that described TTL turns the UART circuit;

Described Input_1B pin: with turn the UART circuit through described KLINE after the RXD2 of 5V be connected;

Described output pin Output_1: the RXD1 that turns the UART circuit with described TTL is connected.

3. the ABS ECU diagnostic equipment with hardware filtering according to claim 1 is characterized in that, described TTL turns the UART circuit 12V signal of computer is converted to the 5V signal, is used for the signal transmission.

4. the ABS ECU diagnostic equipment with hardware filtering according to claim 1 is characterized in that, described KLINE turns the UART circuit described KLINE signal is converted to the 5V signal, is used for the signal transmission.

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