阅读说明：本技术 发动机温度传感器测试系统及测试方法 (Engine temperature sensor test system and test method ) 是由 张大晴 杨岩海 余晓根 左宏业 马俊卿 吴东旭 张玉林 张仕武 黄伟 陶玉桂 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种发动机温度传感器测试系统及测试方法,本发明的设计构思在于,结合温度传感器类型特点及性能参数,利用环境温度箱、控制器、数据采集箱、数据转化及工控机构建出测量方式简单、测量精度高且可实现单个或多个温度传感器进行性能测试的系统架构及相应的测试方法。本发明安装及操作简单、检测时间短且测量精度高,满足研发、生产制造过程中快速检测及试验需求,能够实现对多个发动机温度传感器的高低温性能、耐久性能等统一测试,尤其是不再需要搭配发动机台架或整车,相比于现有的发动机温度传感器测试方案,本发明在保证测试效果全面且稳定的基础上,大幅降低了测试成本。(The invention discloses a system and a method for testing an engine temperature sensor, which are designed by combining the type characteristics and performance parameters of the temperature sensor and utilizing an environment temperature box, a controller, a data acquisition box, data conversion and an industrial personal computer to construct a system architecture which has simple measurement mode and high measurement precision and can realize the performance test of a single or a plurality of temperature sensors and a corresponding test method. The invention has simple installation and operation, short detection time and high measurement precision, meets the requirements of quick detection and test in the research, development and production manufacturing processes, can realize the unified test of high and low temperature performance, durability and the like of a plurality of engine temperature sensors, particularly does not need to be matched with an engine rack or a whole vehicle any more, and greatly reduces the test cost on the basis of ensuring comprehensive and stable test effect compared with the existing test scheme of the engine temperature sensors.)

1. An engine temperature sensor testing system, comprising: the environment temperature box (1), wherein a tooling plate (10) is arranged in the environment temperature box (1); a plurality of sensor mounting supports (9) for mounting temperature sensors (8) to be measured are mounted on the tooling plate (10); the temperature sensor (8) is in electric signal connection with the data acquisition box (4) through a temperature signal transmission line (3); the data acquisition box (4) is in electric signal connection with the data converter (5); the data converter (5) is in electrical signal connection with the industrial personal computer (7); the environment temperature box (1) is in electric signal connection with a temperature box controller (6); the temperature box controller (6) is connected with an industrial personal computer (7) through an electric signal.

2. The engine temperature sensor testing system according to claim 1, characterized in that a ventilation vent (2) is installed above the ambient temperature box (1).

3. The engine temperature sensor testing system of claim 1, characterized in that the temperature signal transmission line (3) is a shielded wire.

4. The engine temperature sensor testing system according to claim 1, characterized in that the data converter (5) comprises: a resistance meter or multimeter.

5. The engine temperature sensor testing system according to claim 1, characterized in that the sensor mounting bracket (9) is provided with a limit mechanism for keeping the mounting depth of each temperature sensor (8) uniform.

6. The engine temperature sensor testing system according to claim 1, characterized in that sealing means are provided at several joints of the ambient temperature box (1) and/or at the location where the temperature sensor (8) is mounted to the sensor mounting support (9).

7. The engine temperature sensor testing system of claim 6, wherein said sealing means comprises a sludge coating or a sealing cover.

8. An engine temperature sensor testing method, comprising:

setting a plurality of test environment temperatures of the environment temperature box and corresponding stabilization time one by one according to the type of a temperature sensor installed in the environment temperature box;

after the current test environmental temperature of the environmental temperature box is stable, acquiring and measuring the measured value of the temperature sensor;

according to a preset temperature-resistance mapping table corresponding to the type of the current temperature sensor, checking whether the deviation between the measured value and a standard value in the table exceeds a preset deviation threshold value;

if yes, outputting a test result representing that the temperature sensor is unqualified; if not, outputting a test result representing that the temperature sensor is qualified.

9. The engine temperature sensor testing method of claim 8, wherein the type of the temperature sensor comprises one or more of the following types of temperature sensors for an engine: the temperature control system comprises a water path temperature sensor, a gas path temperature sensor, a negative temperature sensor and a positive temperature sensor.

10. The engine temperature sensor testing method according to claim 8 or 9, characterized in that the method further comprises: the ambient temperature box was temperature calibrated before starting the test.

Technical Field

The invention relates to the technical field of engines, in particular to a system and a method for testing an engine temperature sensor.

Background

The sensors are important parts of the engine, the number and the types of the sensors carried by each engine are large, and the performance of the sensors directly influences the achievement of the performance and the emission index of the engine. Temperature sensors are usually made of temperature-dependent metal, semiconductor, etc., wherein the basic electrical characteristics of conventional thermistors change with temperature, and also change with self-heating caused by ambient temperature or current passing through the thermistor. Commonly used in the engine art are NTC (negative temperature coefficient) thermistor temperature sensors and positive temperature coefficient resistor temperature sensors, such as Pt200 platinum resistor temperature sensors for exhaust gas temperature detection.

The existing test mode for the temperature sensor related to the engine can generally carry an engine simulation platform or a whole vehicle for testing, so that the test cost is high, the test period is long, and the labor intensity of personnel is high. For example, in the existing system for testing the coolant temperature sensor through the solid-state relay and the heating rod, a lower computer unit, an upper PC, a human-computer interface, an engine working condition simulation device, an engine coolant temperature sensor, an automobile water temperature meter, an alternating current power supply and the like are generally required to be arranged.

Disclosure of Invention

In view of the above, the present invention is directed to a system and a method for testing an engine temperature sensor, so as to overcome many disadvantages of the need of testing the engine temperature sensor with an engine pedestal or a whole vehicle.

The technical scheme adopted by the invention is as follows:

in a first aspect, a system and method for testing an engine temperature sensor includes:

the environment temperature box is internally provided with a tooling plate; a plurality of sensor mounting supports for mounting temperature sensors to be detected are mounted on the tooling plate; the temperature sensor is in electric signal connection with the data acquisition box through a temperature signal transmission line; the data acquisition box is in electric signal connection with the data converter; the data converter is connected with an industrial personal computer through an electric signal; the environment temperature box is in electric signal connection with the temperature box controller; the temperature box controller is connected with an industrial personal computer through an electric signal.

In at least one possible implementation, a ventilation vent is installed above the ambient temperature box.

In at least one possible implementation manner, the temperature signal transmission line is a shielded line.

In at least one possible implementation, the data converter includes: a resistance meter or multimeter.

In at least one possible implementation manner, the sensor mounting support is provided with a limiting mechanism used for keeping the mounting depth of each temperature sensor consistent.

In at least one possible implementation thereof, sealing means are provided at several joints of the ambient temperature box and/or at the location where the temperature sensor is mounted to the sensor mounting support.

In at least one possible implementation thereof, the sealing means comprises a sludge coating or a sealing cover.

In a second aspect, a method for testing an engine temperature sensor includes:

setting a plurality of test environment temperatures of the environment temperature box and corresponding stabilization time one by one according to the type of a temperature sensor installed in the environment temperature box;

after the current test environmental temperature of the environmental temperature box is stable, acquiring and measuring the measured value of the temperature sensor;

according to a preset temperature-resistance mapping table corresponding to the type of the current temperature sensor, checking whether the deviation between the measured value and a standard value in the table exceeds a preset deviation threshold value;

if yes, outputting a test result representing that the temperature sensor is unqualified; if not, outputting a test result representing that the temperature sensor is qualified.

In at least one possible implementation thereof, the type of temperature sensor includes one or more of the following types of temperature sensors for an engine: the temperature control system comprises a water path temperature sensor, a gas path temperature sensor, a negative temperature sensor and a positive temperature sensor.

In at least one possible implementation manner, the method further includes: the ambient temperature box was temperature calibrated before starting the test.

The design concept of the invention is that the system architecture and the corresponding test method which have simple measurement mode and high measurement precision and can realize the performance test of single or a plurality of temperature sensors are constructed by combining the type characteristics and the performance parameters of the temperature sensors and utilizing the environment temperature box, the controller, the data acquisition box, the data conversion and the industrial personal computer. The invention has simple installation and operation, short detection time and high measurement precision, meets the requirements of quick detection and test in the research, development and production manufacturing processes, can realize the unified test of high and low temperature performance, durability and the like of a plurality of engine temperature sensors, particularly does not need to be matched with an engine rack or a whole vehicle any more, and greatly reduces the test cost on the basis of ensuring comprehensive and stable test effect compared with the existing test scheme of the engine temperature sensors.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of an engine temperature sensor testing system provided by an embodiment of the present invention;

FIG. 2 is a partial schematic view of an engine temperature sensor testing system provided in accordance with an embodiment of the present invention;

FIG. 3 is a flow chart of a method for testing an engine temperature sensor provided by an embodiment of the present invention;

fig. 4 is a schematic diagram of a measured resistance curve of an engine water path temperature sensor according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

The present invention proposes an embodiment of an engine temperature sensor testing system, specifically, as shown in fig. 1 and 2, may include the following: the environment temperature box 1 is provided with a tooling plate 10 inside; a plurality of sensor mounting supports 9 for mounting a temperature sensor 8 to be detected are mounted on the tooling plate 10; the temperature sensor 8 is in electric signal connection with the data acquisition box 4 through a temperature signal transmission line 3; the data acquisition box 4 is in electric signal connection with the data converter 5; the data converter 5 is in electrical signal connection with an industrial personal computer 7; the environment temperature box 1 is in electric signal connection with a temperature box controller 6; the temperature box controller 6 is connected with an industrial personal computer 7 through electric signals.

Further, a ventilation vent 2 is installed above the ambient temperature chamber 1.

Further, the temperature signal transmission line 3 is a shielded line.

Further, the data converter 5 includes: a resistance meter or multimeter.

Further, the sensor mounting seat 9 is provided with a limit mechanism for keeping the mounting depth of each temperature sensor 8 uniform.

Further, sealing means are provided at several joints of the ambient temperature box 1, and/or at the position where the temperature sensor 8 is mounted to the sensor mounting support 9.

Further, the sealing means comprises a sludge coating or a sealing cover.

Correspondingly, the invention also provides an engine temperature sensor testing method, as shown in fig. 3, which comprises the following steps:

step S1, setting a plurality of test environment temperatures and corresponding stable time (such as 10 minutes) of the environment temperature box one by one according to the type of the temperature sensor installed on the environment temperature box;

step S2, collecting and measuring the actual measurement value of the temperature sensor after the current test environment temperature of the environment temperature box is stable;

step S3, according to a preset temperature-resistance mapping table corresponding to the type of the current temperature sensor, checking whether the deviation between the measured value and the standard value in the table exceeds a preset deviation threshold value;

if yes, executing step S4, and outputting a test result indicating that the temperature sensor is unqualified; if not, executing step S5 and outputting a test result representing that the temperature sensor is qualified. More preferably, the graph illustrated in fig. 4 can also be output for analysis reference.

Further, the types of temperature sensors include one or more of the following for an engine: the temperature control system comprises a water path temperature sensor, a gas path temperature sensor, a negative temperature sensor and a positive temperature sensor.

Further, the method further comprises: before the test is started, the high-temperature calibration and the low-temperature calibration are carried out on the environment temperature box, and the temperature setting range of the high-temperature calibration and the low-temperature calibration is-40 ℃ to 900 ℃.

For the convenience of understanding, the following description will be made taking the water path temperature sensor of the engine as an example: the method comprises the steps that a plurality of waterway temperature sensors are installed on a sensor installation support, a controller is used for setting the test temperature of an environment temperature box to be-20 ℃, 10 ℃, 0 ℃, 10 ℃, 20 ℃, 120 ℃, 130 ℃ and 140 ℃, after each test temperature is stable, the resistance value actually measured by the current waterway temperature sensor is measured through a data acquisition box and a data conversion component (such as a resistance value detection instrument) and is transmitted to an industrial personal computer, the industrial personal computer calls and inquires a prestored temperature-resistance value relation table of the waterway temperature sensor, the actually measured resistance value result is compared with the corresponding standard resistance value at the current test temperature, and if the deviation is in a preset error interval, the tested waterway temperature sensor is determined to be normally usable.

In summary, the design concept of the invention is that, in combination with the type characteristics and performance parameters of the temperature sensors, the environment temperature box, the controller, the data acquisition box, the data conversion and the industrial personal computer are utilized to construct a system architecture and a corresponding test method which have simple measurement mode and high measurement precision and can realize performance test of a single or a plurality of temperature sensors. The invention has simple installation and operation, short detection time and high measurement precision, meets the requirements of quick detection and test in the research, development and production manufacturing processes, can realize the unified test of high and low temperature performance, durability and the like of a plurality of engine temperature sensors, particularly does not need to be matched with an engine rack or a whole vehicle any more, and greatly reduces the test cost on the basis of ensuring comprehensive and stable test effect compared with the existing test scheme of the engine temperature sensors.

In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.

The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the invention are within the scope of the invention as long as they are not beyond the spirit of the description and the drawings.