CN103885379A - Rotating speed type multisensory signal collecting device - Google Patents

Abstract

The invention discloses a rotating speed type multisensory signal collecting device, which is used for collecting various kinds of signals of a sensor group. The collection device comprises a power supply module, an industrial personal computer, a PLC, a signal conditioning circuit and an AD collection card. The power supply module is connected to the industrial personal computer, the sensor group and the PLC; the industrial personal computer is connected to the PLC; the industrial computer is connected to the AD collection card; the PCL transmits control signals for switching on and off the signal conditioning circuit to receive the signals transmitted by the sensor; the AD collection card is connected to the signal conditioning circuit for collecting the signal outputted by the signal conditioning circuit. Compared with the prior art, the invention has advantages of easy operation, reducing error and saving cost.

Description

A speed type multi-sensor signal acquisition device

technical field

The invention relates to a signal acquisition device, in particular to a rotational speed type multi-sensor signal acquisition device.

Background technique

With the development of electronic technology and the continuous improvement of the electronic degree of automobiles, the usual mechanical systems have been difficult to solve some problems related to the functional requirements of automobiles, and have been replaced by electronic control systems. In modern automotive electronic control, sensors are widely used in engine control systems, chassis control systems, body control systems and navigation systems. Sensors can identify changes in the outside world and the system itself in a timely manner, perform real-time and accurate measurements of information such as temperature, pressure, position, speed, and volume flow, and transmit the information to a computer for processing, thereby realizing electronic control of various automotive systems.

Domestic automotive sensor manufacturers have higher and higher performance requirements for speed sensors, and have put forward high requirements for the durability, stability, and intelligence of speed sensor detection devices.

At present, the detection of vehicle speed sensors in China is mostly achieved by manual observation with an oscilloscope. Therefore, it is increasingly difficult to meet the requirements of modern vehicle sensors due to low efficiency, poor accuracy, limitations in data processing and analysis capabilities, and difficulty in storing data. needs.

Contents of the invention

The object of the present invention is to provide a speed-type multi-sensor signal acquisition device in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A rotational speed type multi-sensor signal acquisition device for collecting multiple signals of sensor groups, characterized in that the acquisition device includes a power supply module, an industrial computer, a PLC, a signal conditioning circuit and an AD acquisition card, and the power supply The modules are respectively connected to the industrial computer, the sensor group and the PLC, the industrial computer is connected to the PLC, the industrial computer is connected to the AD acquisition card, and the PLC sends a control signal to turn on or off the signal conditioning circuit to receive the signal sent by the sensor signal, the AD acquisition card is connected with the signal conditioning circuit to collect the output signal of the signal conditioning circuit.

The industrial computer is connected to the PLC through a network port.

The industrial computer is connected with the AD acquisition card through a PCI interface.

The signal conditioning circuit includes a positive input terminal, a negative input terminal, an output terminal, a resistor R1, a resistor R2, a resistor R3, a potentiometer RW1, a relay K1, a relay K2 and a relay K3, the positive input terminal, the resistor R1, Resistor R2, resistor R3, potentiometer RW1 and the negative input terminal are connected in series in sequence, the coils of the relay K1, relay K2 and relay K3 are respectively connected to the PLC, and the contacts of the relay K1 are respectively connected to the positive input terminal and the output terminal One end of the contact of the relay K2 is connected between the resistor R1 and the resistor R2, the other end is connected to the output end, one end of the contact of the relay K3 is connected between the resistor R2 and the resistor R3, and the other end is connected to the output connection.

The resistance value of the resistor R1 is 40.2KΩ.

The resistance value of the resistor R2 is 5.1KΩ.

The resistance value of the resistor R3 is 5.1KΩ.

The resistance value of the potentiometer RW1 is 1KΩ.

There are 9 multi-sensors in total, including three types of sensors capable of measuring vehicle speed, position and rotational speed, and each type of sensor has 3 types.

The AD acquisition card has 3 channels, and the vehicle speed sensor, position sensor and rotational speed sensor are respectively connected to the 3 channels through a signal conditioning circuit.

Compared with the prior art, the present invention has the following advantages:

1. Easy to operate. All operations of this device can be passed on the upper computer of the industrial computer, and the human-computer interaction interface realizes a series of operations such as multi-sensor signal collection, measurement, and storage. Compared with traditional manual measurement and recording methods, it is more reliable, more convenient, more stable and more flexible. Can meet the various needs of users. It is convenient for sensor manufacturers to measure and save various indicators of the sensor.

2. Reduce errors. This device uses a 20M high-speed acquisition card to sample the sensor signal, and the accuracy is higher than that of the traditional measurement method. However, Hall sensors often need to measure the rising and falling edges of the sensor output signal. For this type of microsecond-level measurement, the error caused by the measurement accuracy can be reduced.

3. Cost saving. PLC is used to control the switching of input signal channels and attenuation magnifications, and only 3 AD sampling channels can be used to simultaneously collect 3 types, 3 for each type, and a total of 9 sensors for continuous acquisition.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a schematic diagram of a signal conditioning circuit module of the present invention.

Fig. 3 is a schematic diagram of the interface of the AD acquisition card of the present invention.

In Figure 2, Ui+ and Ui- are input signals, Uo+ and Uo- are output signals, and KEY1, KEY2 and KEY3 are relay control signals respectively.

In Figure 3, AI1+ and AI1- are one signal input to channel 1 of the acquisition card, and AI2+, AI2-, AI3+, AI3- are input to channel 2 and 3 respectively. OUT-C1 and C1-, OUT-C2 and C2-, OUT-C3 and C3- are the output signals of the three-way vehicle speed sensor after the conditioning circuit; OUT-W1 and W1-, OUT-W2 and W2-, OUT- W3 and W3- are the output signals of the three-way position sensor after the conditioning circuit; OUT-Z1 and Z1-, OUT-Z2 and Z2-, OUT-Z3 and Z3- are the output of the three-way speed sensor after the conditioning circuit Signal.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

As shown in Figure 1, Figure 2 and Figure 3, a speed-type multi-sensor signal acquisition device is used to collect various signals of sensor groups. The acquisition device includes a power module, an industrial computer, a PLC, a signal conditioning circuit and AD acquisition card, the power supply module is connected with the industrial computer, the sensor group and PLC respectively, the industrial computer is connected with the PLC, the industrial computer is connected with the AD acquisition card, and the PLC sends a control signal to turn on or off The signal conditioning circuit receives the signal sent by the sensor, and the AD acquisition card is connected with the signal conditioning circuit to collect the output signal of the signal conditioning circuit.

The industrial computer is connected to the PLC through a network port. The industrial computer is connected with the AD acquisition card through a PCI interface.

The signal conditioning circuit includes a positive input terminal, a negative input terminal, an output terminal, a resistor R1, a resistor R2, a resistor R3, a potentiometer RW1, a relay K1, a relay K2 and a relay K3, the positive input terminal, the resistor R1, Resistor R2, resistor R3, potentiometer RW1 and the negative input terminal are connected in series in sequence, the coils of the relay K1, relay K2 and relay K3 are respectively connected to the PLC, and the contacts of the relay K1 are respectively connected to the positive input terminal and the output terminal One end of the contact of the relay K2 is connected between the resistor R1 and the resistor R2, the other end is connected to the output end, one end of the contact of the relay K3 is connected between the resistor R2 and the resistor R3, and the other end is connected to the output connection.

When KEY1 outputs a high level, the relay K1 is closed, and the output signal Uo=Ui, that is, no attenuation output;

When KEY2 outputs a high level, the relay K2 is closed, and the output signal Uo=(RW1+R3+R2)/(RW1+R3+R2+R1)*Ui, that is, 5 times attenuation output;

When KEY3 outputs a high level, the relay K3 is closed, and the output signal Uo=(RW1+R3)/(RW1+R3+R2+R1)*Ui, that is, 10 times attenuation output.

The resistance value of the resistor R1 is 40.2KΩ. The resistance value of the resistor R2 is 5.1KΩ. The resistance value of the resistor R3 is 5.1KΩ. The resistance value of the potentiometer RW1 is 1KΩ.

There are 9 multi-sensors in total, including three types of sensors capable of measuring vehicle speed, position and rotational speed, and each type of sensor has 3 types.

The AD acquisition card has 3 channels, and the vehicle speed sensor, position sensor and rotational speed sensor are respectively connected to the 3 channels through a signal conditioning circuit. Vehicle speed sensors 1, 2, 3 are connected to acquisition card channel 1 through relay K1; position sensors 1, 2, 3 are connected to acquisition card channel 2 through relay K2; speed sensors 1, 2, 3 are connected to acquisition card channel 3 through relay K3 .

Claims (10)

1. a rotating speed class multiple sensor signals harvester, for the multi-signal of pick-up transducers group, it is characterized in that, described harvester comprises power module, industrial computer, PLC, signal conditioning circuit and AD capture card, described power module respectively with industrial computer, sensor group is connected with PLC, described industrial computer is connected with PLC, described industrial computer is connected with AD capture card, described PLC sends the signal that control signal is opened or cut-off signals modulate circuit receiving sensor sends, described AD capture card is connected with signal conditioning circuit, the output signal of collection signal modulate circuit.

2. a kind of rotating speed class multiple sensor signals harvester according to claim 1, is characterized in that, described industrial computer is connected by network interface with PLC.

3. a kind of rotating speed class multiple sensor signals harvester according to claim 1, is characterized in that, described industrial computer is connected by pci interface with AD capture card.

4. a kind of rotating speed class multiple sensor signals harvester according to claim 1, it is characterized in that, described signal conditioning circuit comprises electrode input end, negative input, output terminal, resistance R 1, resistance R 2, resistance R 3, potentiometer RW1, relay K 1, relay K 2 and relay K 3, described electrode input end, resistance R 1, resistance R 2, resistance R 3, potentiometer RW1 and negative input are connected successively, described relay K 1, the coil of relay K 2 and relay K 3 is connected with PLC respectively, the contact of described relay K 1 is connected with electrode input end and output terminal respectively, contact one end of described relay K 2 is connected between resistance R 1 and resistance R 2, the other end is connected with output terminal, contact one end of described relay K 3 is connected between resistance R 2 and resistance R 3, the other end is connected with output terminal.

5. a kind of rotating speed class multiple sensor signals harvester according to claim 1, is characterized in that, the resistance of described resistance R 1 is 40.2K Ω.

6. a kind of rotating speed class multiple sensor signals harvester according to claim 1, is characterized in that, the resistance of described resistance R 2 is 5.1K Ω.

7. a kind of rotating speed class multiple sensor signals harvester according to claim 1, is characterized in that, the resistance of described resistance R 3 is 5.1K Ω.

8. a kind of rotating speed class multiple sensor signals harvester according to claim 1, is characterized in that, the resistance of described potentiometer RW1 is 1K Ω.

9. a kind of rotating speed class multiple sensor signals harvester according to claim 1, is characterized in that, described multisensor has 9, comprises three kinds of sensors can measuring the speed of a motor vehicle, position and rotating speed, and every kind of sensor has 3.

10. according to a kind of rotating speed class multiple sensor signals harvester described in claim 1 and 7, it is characterized in that, described AD capture card has 3 passages, and described vehicle speed sensor, position transducer and speed probe is connected with 3 passages respectively by signal conditioning circuit.

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