CN-118962010-B - Air quality sensor integrating temperature detection and detection system

CN118962010BCN 118962010 BCN118962010 BCN 118962010BCN-118962010-B

Abstract

The invention provides an air quality sensor integrating temperature detection and a detection system, wherein the air quality sensor comprises an MEMS sensor unit and a temperature detection unit, the MEMS sensor unit is used for detecting the quality of air outside a vehicle and adjusting heating power consumption, the air quality sensor comprises a sensor chip, an MOS tube and a plurality of resistors, the MOS tube is connected with the sensor chip, a heating loop and a sensitive loop are connected inside the sensor chip, and the temperature detection unit is used for detecting the ambient temperature and comprises a thermistor, a resistor and a capacitor, and the resistor and the capacitor are connected with the thermistor. The air quality detection system comprises the air quality sensor, the MCU module, the power management module and the LIN communication module, wherein the MCU module is used for receiving detection signals of the air quality sensor and simultaneously calculating and controlling heating power consumption of the air quality sensor, the power management module is used for providing stable working voltage for the whole detection system, and the LIN communication module is used for communicating the detection system with other systems of a vehicle. The invention ensures the stability of the working temperature and the gas sensitivity of the sensor module.

Inventors

WANG RUIBING
MA WEIWEI
GONG FENGYUAN
LIU YANG
CHEN SHIJUN
LUO YUXUE

Assignees

孝感华工高理电子有限公司

Dates

Publication Date: 20260505
Application Date: 20240730

Claims (7)

1. The air quality sensor integrating temperature detection is characterized by comprising an MEMS sensor unit and a temperature detection unit, wherein the MEMS sensor unit is used for detecting the quality of air outside a vehicle and adjusting heating power consumption, the temperature detection unit is used for detecting the temperature outside the vehicle, the MEMS sensor unit comprises a sensor chip, an MOS tube and a plurality of resistors, the MOS tube is connected with the sensor chip, a heating loop and a sensitive loop are connected inside the sensor chip, and the temperature detection unit comprises a thermistor, a resistor and a capacitor, wherein the resistor and the capacitor are connected with the thermistor; The sensor chip is provided with a first pin, a second pin, a third pin and a fourth pin, a heating resistor is connected between the first pin and the third pin to form a heating loop, a gas-sensitive resistor is connected between the second pin and the fourth pin to form a sensitive loop, the first pin and the second pin are respectively connected with the first resistor and the second resistor and then connected to a VCC end, the third pin is connected with the MOS tube, the MOS tube is connected with the third resistor and the fourth resistor and then connected to a PWM end, and the fourth pin is connected to the ground; The thermistor is connected in series with the fifth resistor, the thermistor is connected in parallel with the first capacitor, and a common connection end of the thermistor, the fifth resistor and the first capacitor is connected to the NTC end.
2. The integrated temperature-sensing air quality sensor of claim 1 wherein the sensor chip comprises at least one of a MEMS carbon monoxide sensor chip, a MEMS ammonia sensor chip or a MEMS nitrogen dioxide sensor chip.
3. The integrated temperature-sensing air quality sensor of claim 2, wherein the air quality sensor comprises a plurality of MEMS sensor units, the MEMS sensor units employing different types of sensor chips.
4. An integrated temperature detection air quality detection system comprises an integrated temperature detection air quality sensor as claimed in any one of claims 1-3 and is characterized by further comprising an MCU module, a power management module and a LIN communication module, wherein the air quality sensor, the power management module and the LIN communication module are all connected with the MCU module, the air quality sensor is used for detecting the air quality outside a vehicle and the ambient temperature, the MCU module is used for receiving detection signals of the air quality sensor and simultaneously calculating and controlling the heating power consumption of the air quality sensor, the power management module is used for providing stable working voltage for the whole detection system, the LIN communication module is used for communicating the detection system with other systems of the vehicle and providing the obtained air quality value for the other systems for corresponding processing.
5. The air quality detection system integrating temperature detection according to claim 4, wherein the first pin, the second pin, the PWM end and the NTC end in the air quality sensor are connected to the MCU module, the MCU module can acquire the voltage signal of the first pin in real time to obtain the power consumption of the heating circuit, the MCU module can acquire the voltage signal of the second pin to obtain the corresponding gas concentration at the moment through the characteristic of the gas-sensitive resistor, the MCU module can acquire the voltage signal of the NTC end to obtain the current ambient temperature according to the characteristic of the thermistor, the MCU module calculates according to the current ambient temperature by utilizing a PID algorithm, and outputs PWM waves capable of adjusting the duty ratio to control the on-off of the heating circuit so as to adjust the heating power consumption, and the sensor chip works in a proper temperature range.
6. The integrated temperature sensing air quality detection system of claim 4 wherein: the LIN communication module comprises an LIN communication chip, and a resistor, a capacitor, an inductor and an ESD diode which are connected with the LIN communication chip.
7. The integrated temperature sensing air quality detection system of claim 4 wherein: the power management module comprises a TVS diode, a rectifier diode, an inductor and a plurality of capacitors which are connected with a power input end, a power management chip, and the inductor and the capacitors which are connected with the power management chip.

Description

Air quality sensor integrating temperature detection and detection system Technical Field The invention relates to the technical field of semiconductor sensors, in particular to an air quality sensor integrating temperature detection and a detection system. Background With the rapid development of the automobile industry, the requirements of the air quality inside the automobile are increasingly increasing. Particularly in urban environments, due to traffic jams and environmental pollution, the air quality inside automobiles is often affected by external harmful gases, such as volatile organic compounds, CO, nitrogen oxides (NOx), NH3, etc. Prolonged exposure to these harmful gases can pose a health hazard to the occupants. In order to improve the situation, an automatic automobile air quality control system (AQS) is developed, and the automatic automobile air quality control system can detect the air quality inside and outside an automobile in real time, accurately detect indexes such as PM2.5 particulate matters, harmful gas concentration and the like in the air outside the automobile through a high-sensitivity sensor integrated at an air inlet, and when the air quality outside the automobile is detected to be poor, if the conditions such as haze, tail gas pollution and the like are met, the system can automatically start an internal circulation mode so as to reduce pollutants from entering the interior of a carriage. The core component of AQS is an air quality sensor, of which AQS sensors based on metal oxide semiconductors are receiving great attention for their advantages of high sensitivity, fast response and low cost. However, in the complex working environment of the existing AQS sensor, especially in the case of large temperature variation, the performance of the AQS sensor is seriously affected, so that errors occur in the detection result. Disclosure of Invention The invention aims to provide an air quality sensor and a detection system integrating temperature detection, which are used for detecting the air quality outside a vehicle and the ambient temperature and performing temperature compensation so as to solve the problem that the performance of the existing AQS sensor is seriously affected under the condition of large temperature change, and the detection result is error. The specific technical scheme is as follows: The utility model provides an integrated temperature detection's air quality sensor, includes MEMS sensor unit and temperature detection unit, MEMS sensor unit is used for detecting the outside air quality of car and carries out the heating consumption adjustment, temperature detection unit is used for detecting the outside environment temperature of car, MEMS sensor unit include the sensor chip and with MOS pipe and a plurality of resistance that the sensor chip is connected, sensor chip internally connected has heating circuit and sensitive return circuit, temperature detection unit include thermistor and with resistance and the electric capacity that the temperature is connected. Further, the sensor chip is provided with a first pin, a second pin, a third pin and a fourth pin, a heating resistor is connected between the first pin and the third pin to form a heating loop, a gas-sensitive resistor is connected between the second pin and the fourth pin to form a sensitive loop, the first pin and the second pin are respectively connected with the first resistor and the second resistor and then connected to a VCC end, the third pin is connected with the MOS tube, the MOS tube is connected with the third resistor and the fourth resistor and then connected to a PWM end, and the fourth pin is connected to the ground. Further, the thermistor is connected in series with the fifth resistor, the thermistor is connected in parallel with the first capacitor, and a common connection end of the thermistor, the fifth resistor and the first capacitor is connected to the NTC end. Further, the sensor chip comprises at least one of a MEMS carbon monoxide sensor chip, a MEMS ammonia sensor chip or a MEMS nitrogen dioxide sensor chip. Further, the air quality sensor comprises a plurality of MEMS sensor units, and the MEMS sensor units adopt different kinds of sensor chips. The invention also provides an air quality detection system integrating temperature detection, which comprises the air quality sensor integrating temperature detection, and further comprises an MCU module, a power management module and an L IN communication module, wherein the air quality sensor, the power management module and the L IN communication module are all connected with the MCU module, the air quality sensor is used for detecting the air quality outside the vehicle and the ambient temperature, the MCU module is used for receiving detection signals of the air quality sensor and simultaneously calculating and controlling the heating power consumption of the air quality sensor, the power management module is used for provid