CN214372654U

CN214372654U - Automobile-used urea liquid level temperature concentration check out test set

Info

Publication number: CN214372654U
Application number: CN202120628895.9U
Authority: CN
Inventors: 张建付
Original assignee: Shenzhen Cheboshi Electromechanical Equipment Co ltd
Current assignee: SHENZHEN AUTOSOS TECHNOLOGY Co.,Ltd.
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-10-08
Anticipated expiration: 2031-03-29

Abstract

The utility model discloses a urea liquid level temperature concentration detection device for a vehicle, which comprises a detection mainboard and an ultrasonic probe; the detection main board comprises a 24V-to-5V power circuit, a 5V-to-3.3V power circuit, a CAN transceiver, an ultrasonic simulation front-end chip, a urea liquid level sampling circuit, a urea liquid temperature sampling circuit, an ultrasonic probe temperature sampling circuit and a 32-bit singlechip; the ultrasonic probe comprises an ultrasonic propagation groove, an ultrasonic transducer and a probe temperature sensor; 32 single chip computer passes through the SPI bus and GPIO port and is connected with ultrasonic simulation front end chip, and the CAN transceiver changes 5V power supply circuit power supply by 24V, and 32 single chip computer is connected with the CAN transceiver, and 32 single chip computer passes through self ADC interface and is connected with urea liquid level sampling circuit, urea liquid temperature sampling circuit and ultrasonic probe temperature sampling circuit respectively, and 32 single chip computer changes 3.3V power supply circuit power supply by 5V. The utility model discloses when guaranteeing urea concentration measurement's accuracy nature and real-time, the scheme cost has further been reduced.

Description

Automobile-used urea liquid level temperature concentration check out test set

Technical Field

The utility model relates to a commercial car SCR aftertreatment field, concretely relates to automobile-used urea liquid level temperature concentration check out test set.

Background

In the emission standard of 'national fourth' and later 'national fifth', the SCR system adopts default 32.5% concentration urea solution to calculate the actual required injection amount of urea, but the mode needs to ensure that the concentration of the urea solution added by a vehicle meets the requirement of 32.5% concentration value, and once the concentration of the solution in a urea tank of the vehicle has deviation, the emission can not reach the standard. With the coming of stricter national six emission standards and the gradual maturity of the scheme of ultrasonic measurement of liquid concentration, the demand of urea concentration measurement equipment which is oriented to the accuracy, real-time and low cost of the SCR post-processing system of the commercial vehicle is more and more vigorous, the urea concentration measurement scheme matched with the current marketed national six vehicle type can achieve the accuracy and the real-time performance, but the cost of the whole scheme is higher due to the adoption of the single-chip external high-accuracy timer chip TDC7200 and the external two-channel ultrasonic simulation front-end chip TDC 1000.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a vehicle urea liquid level temperature concentration check out test set when guaranteeing urea concentration measurement's accuracy nature and real-time, further reduction scheme cost.

The utility model discloses a realize through following technical scheme: a urea liquid level temperature concentration detection device for a vehicle comprises a detection main board and an ultrasonic probe; the detection main board comprises a 24V-to-5V power circuit, a 5V-to-3.3V power circuit, a CAN transceiver, an ultrasonic simulation front-end chip, a urea liquid level sampling circuit, a urea liquid temperature sampling circuit, an ultrasonic probe temperature sampling circuit and a 32-bit singlechip; the ultrasonic probe comprises an ultrasonic propagation groove, an ultrasonic transducer and a probe temperature sensor; 32 bit singlechip passes through the SPI bus and the GPIO port is connected with ultrasonic simulation front end chip, the CAN transceiver changes 5V power supply circuit power supply by 24V, 32 bit singlechip is connected with the CAN transceiver, 32 bit singlechip passes through self ADC interface and is connected with urea liquid level sampling circuit, urea liquid temperature sampling circuit and ultrasonic transducer temperature sampling circuit respectively, 32 bit singlechip changes 3.3V power supply circuit power supply by 5V.

Preferably, the ultrasonic analog front end chip is a single-channel ultrasonic analog front end chip TDC1011PW R, which ensures the accuracy of the time difference between the start pulse signal and the stop pulse signal returned to the 32-bit single chip microcomputer by the chip. After receiving a measurement request sent by the 32-bit singlechip, the chip sends a start pulse signal to the 32-bit singlechip and drives the ultrasonic transducer to work, and after receiving an echo returned by ultrasonic waves, sends a stop pulse signal to the 32-bit singlechip to finish the measurement.

Preferably, the 32-bit single chip microcomputer is internally provided with a high-precision timer. The built-in high-precision timer is used for measuring the time difference between a start pulse signal and a stop pulse signal returned by the ultrasonic simulation front-end chip, and the TDC7200 of the external independent time measuring chip of the 32-bit single chip microcomputer is eliminated.

The utility model has the advantages that: the utility model discloses a detect the mainboard design and make this car with urea liquid level temperature concentration check out test set can be when guaranteeing to measure urea solution concentration accuracy nature and real-time, further reduced the scheme cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

fig. 2 is a circuit diagram of the present invention.

Detailed Description

Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

As shown in fig. 1 to 2, a device for detecting the liquid level, temperature and concentration of urea for vehicles comprises a detection main board and an ultrasonic probe; the detection main board comprises a 24V-to-5V power circuit, a 5V-to-3.3V power circuit, a CAN transceiver, an ultrasonic simulation front-end chip, a urea liquid level sampling circuit, a urea liquid temperature sampling circuit, an ultrasonic probe temperature sampling circuit and a 32-bit singlechip; the ultrasonic probe comprises an ultrasonic propagation groove, an ultrasonic transducer and a probe temperature sensor; 32 bit singlechip passes through the SPI bus and the GPIO port is connected with ultrasonic simulation front end chip, the CAN transceiver changes 5V power supply circuit power supply by 24V, 32 bit singlechip is connected with the CAN transceiver, 32 bit singlechip passes through self ADC interface and is connected with urea liquid level sampling circuit, urea liquid temperature sampling circuit and ultrasonic transducer temperature sampling circuit respectively, 32 bit singlechip changes 3.3V power supply circuit power supply by 5V.

After the equipment is powered on, the SPI bus of the 32-bit single chip microcomputer controls the ultrasonic simulation front-end chip to measure the concentration, the 32-bit single chip microcomputer collects the urea liquid level, the urea temperature and the ultrasonic probe temperature through the urea liquid level sampling circuit, the urea liquid temperature sampling circuit and the ultrasonic probe temperature sampling circuit, and the urea liquid level, the urea temperature, the ultrasonic probe temperature, the urea concentration and the measurement fault state information are broadcasted to the outside through an external vehicle-mounted CAN node connected with the CAN transceiver.

In this embodiment, the ultrasonic analog front end chip is a single-channel ultrasonic analog front end chip TDC1011PWR, which ensures the accuracy of the time difference between the start pulse signal and the stop pulse signal of the chip returned to the 32-bit single chip microcomputer.

After receiving a measurement request sent by the 32-bit single chip microcomputer, the ultrasonic simulation front-end chip sends a start pulse signal to the 32-bit single chip microcomputer and drives the ultrasonic transducer to work, and after receiving an echo returned by ultrasonic waves, sends a stop pulse signal to the 32-bit single chip microcomputer and finishes the measurement.

In this embodiment, the 32-bit single chip microcomputer is provided with a high-precision timer therein. And measuring the time difference between the start pulse signal and the stop pulse signal returned by the ultrasonic analog front-end chip by using a built-in high-precision timer.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the creative work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. The utility model provides an automobile-used urea liquid level temperature concentration check out test set which characterized in that: comprises a detection main board and an ultrasonic probe; the detection main board comprises a 24V-to-5V power circuit, a 5V-to-3.3V power circuit, a CAN transceiver, an ultrasonic simulation front-end chip, a urea liquid level sampling circuit, a urea liquid temperature sampling circuit, an ultrasonic probe temperature sampling circuit and a 32-bit singlechip; the ultrasonic probe comprises an ultrasonic propagation groove, an ultrasonic transducer and a probe temperature sensor; 32 bit singlechip passes through the SPI bus and the GPIO port is connected with ultrasonic simulation front end chip, the CAN transceiver changes 5V power supply circuit power supply by 24V, 32 bit singlechip is connected with the CAN transceiver, 32 bit singlechip passes through self ADC interface and is connected with urea liquid level sampling circuit, urea liquid temperature sampling circuit and ultrasonic transducer temperature sampling circuit respectively, 32 bit singlechip changes 3.3V power supply circuit power supply by 5V.

2. The urea liquid level temperature concentration detection device for the vehicle according to claim 1, wherein: the ultrasonic simulation front-end chip is a single-channel ultrasonic simulation front-end chip TDC1011 PWR.

3. The urea liquid level temperature concentration detection device for the vehicle according to claim 1, wherein: a high-precision timer is arranged in the 32-bit single chip microcomputer.