Multipath signal acquisition circuit, control device and vehicle

Abstract

The embodiment of the utility model provides a multi-channel signal acquisition circuit, a control device and a vehicle, the multi-channel signal acquisition circuit aims at each sensor, the two ends of the sensor are respectively connected with a switching device in series, and a gating signal is used for controlling a gating circuit to control the on-off of each switching device; therefore, on-off of lines where the sensors are located between the first node and the second node is controlled, only one sensor is gated to be conducted with the signal conditioning circuit at the same time, and the multiple sensors input electric signals to the signal conditioning circuit in a time-sharing mode according to switching of the gating circuit. Therefore, one signal conditioning circuit can acquire electric signals of a plurality of sensors, the signal conditioning circuits do not need to be in one-to-one correspondence with the sensors, the number of the signal conditioning circuits needing to be used is reduced, and the utilization efficiency of the signal conditioning circuits is improved. The signal conditioning circuit can control a plurality of sensors only on the basis of fewer control signal pins, so that the pins occupied by the control circuit for providing control signals are reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of signal acquisition, and particularly relates to a multi-channel signal acquisition circuit, a control device and a vehicle. BACKGROUND

[0002] A sensor is an electronic device capable of converting a physical quantity into an electrical signal. Common physical quantities include temperature, pressure, speed, etc. For example, a sensor can be a temperature sensor Pt1000, i.e., a temperature sensor using a Pt (platinum) resistor with a resistance value of 1000 ohms at 0°C. When collecting signals of a sensor, a one-to-one connection form of the sensor and an ADC (Analog-to-Digital Converter, or Analog-to-Digital Converter) chip or an operational amplifier (abbreviated as an operational amplifier) is often used for collection. In the case of a large number of sensors, multiple ADC chips or multiple operational amplifiers are needed to collect electrical signals of each sensor, which is relatively high in cost. SUMMARY

[0003] The present application aims to at least solve the problem of high cost of a multi-channel sensor signal acquisition circuit in the related art. The purpose is achieved by the following technical solutions:

[0004] A first aspect of the present application provides a multi-channel signal acquisition circuit, comprising:

[0005] A first group of switching devices, the first group of switching devices corresponding one-to-one to a plurality of sensors, each switching device in the first group of switching devices being connected in series between a positive electrode of a corresponding sensor and a first node; each sensor in the plurality of sensors being configured to sense a physical quantity and convert the physical quantity into a corresponding electrical signal;

[0006] A second group of switching devices, the second group of switching devices corresponding one-to-one to the plurality of sensors, each switching device in the second group of switching devices being connected in series between a negative electrode of a corresponding sensor and a second node;

[0007] A gating circuit, connected to the first group of switching devices and the second group of switching devices, configured to gate a first switching device in the first group of switching devices and a second switching device in the second group of switching devices according to a gate signal, and the first switching device and the second switching device both correspond to a first sensor in the plurality of sensors;

[0008] A signal conditioning circuit, connected to the first node and the second node, configured to receive an electrical signal of the first sensor for conditioning.

[0009] In some embodiments, the switch device is an optocoupler, each of the optocouplers comprising: a light emitting diode controlled on and off by the gate signal; and a photosensitive device controlled on and off by a light signal of the light emitting diode;

[0010] The photosensitive device of each of the switch devices in the first group of switch devices is connected in series between a positive electrode of the corresponding sensor and the first node;

[0011] The photosensitive device of each of the switch devices in the second group of switch devices is connected in series between a negative electrode of the corresponding sensor and the second node;

[0012] The gate circuit is connected with the light emitting diode of each of the switch devices in the first group of switch devices and the light emitting diode of each of the switch devices in the second group of switch devices.

[0013] In some embodiments, the gate circuit comprises a first gate sub-circuit and a second gate sub-circuit; the gate signal comprises a first sub-gate signal and a second sub-gate signal;

[0014] The first gate sub-circuit is connected with the light emitting diode of each of the switch devices in the first group of switch devices, for gating the light emitting diode of the first switch device according to the first sub-gate signal;

[0015] The second gate sub-circuit is connected with the light emitting diode of each of the switch devices in the second group of switch devices, for gating the light emitting diode of the second switch device according to the second sub-gate signal.

[0016] In some embodiments, the first gate sub-circuit comprises a plurality of first input pins, each of the first input pins being connected with a negative electrode of the light emitting diode of the corresponding switch device in the first group of switch devices;

[0017] The second gate sub-circuit comprises a plurality of second input pins, each of the second input pins being connected with a negative electrode of the light emitting diode of the corresponding switch device in the second group of switch devices;

[0018] A positive electrode of the light emitting diode of each of the switch devices is connected with a power supply.

[0019] In some embodiments, the multi-channel signal acquisition circuit further comprises:

[0020] A control chip connected with a control terminal of the first gate sub-circuit and a control terminal of the second gate sub-circuit, for inputting the first sub-gate signal to the control terminal of the first gate sub-circuit and inputting the second sub-gate signal to the control terminal of the second gate sub-circuit.

[0021] In some embodiments, the first gating sub-circuit and / or the second gating sub-circuit is a decoder.

[0022] In some embodiments, the signal conditioning circuit is an analog-to-digital converter chip.

[0023] In some embodiments, the analog-to-digital converter chip comprises a first pin and a second pin, the first pin is connected with the first node, and the second pin is connected with the second node; the analog-to-digital converter chip is configured to output a sampling value according to the electrical signal of the first sensor input by the first pin and the second pin.

[0024] In some embodiments, the sensor is a temperature sensor.

[0025] In some embodiments, the temperature sensor is a resistance temperature sensor.

[0026] A second aspect of the present application provides a control device, comprising:

[0027] A multi-channel signal acquisition circuit, comprising: a first group of switching devices, each of the switching devices in the first group of switching devices being connected in series between a positive electrode of a corresponding sensor and a first node; each of the sensors is configured to sense a physical quantity and convert it into a corresponding electrical signal; a second group of switching devices, each of the switching devices in the second group of switching devices being connected in series between a negative electrode of a corresponding sensor and a second node; a gating circuit connected with the first group of switching devices and the second group of switching devices, configured to gate a first switching device in the first group of switching devices and a second switching device in the second group of switching devices according to a gating signal, and the first switching device and the second switching device both correspond to a first sensor in the plurality of sensors; a signal conditioning circuit connected with the first node and the second node, configured to receive and condition the electrical signal of the first sensor;

[0028] A control chip connected with the gating circuit and the signal conditioning circuit, the control chip being configured to output the gating signal to the gating circuit to gate the first switching device and the second switching device, and execute a control strategy according to the conditioned electrical signal of the signal conditioning circuit.

[0029] A third aspect of the present application provides a vehicle, comprising:

[0030] An engine;

[0031] A plurality of temperature sensors configured to sense a temperature of the engine.

[0032] The control device comprises a multi-channel signal acquisition circuit and a control chip; the multi-channel signal acquisition circuit comprises a first group of switching devices corresponding to a plurality of temperature sensors, each of the switching devices in the first group of switching devices being connected in series between a positive electrode of the corresponding temperature sensor and a first node; each of the temperature sensors in the plurality of temperature sensors is used to sense a physical quantity and convert the physical quantity into a corresponding electrical signal; a second group of switching devices corresponding to the plurality of temperature sensors, each of the switching devices in the second group of switching devices being connected in series between a negative electrode of the corresponding temperature sensor and a second node; a gating circuit connected to the first group of switching devices and the second group of switching devices, used to gate a first switching device in the first group of switching devices and a second switching device in the second group of switching devices according to a gating signal, and the first switching device and the second switching device both correspond to a first temperature sensor in the plurality of temperature sensors; a signal conditioning circuit connected to the first node and the second node, used to receive an electrical signal of the first temperature sensor for conditioning; and the control chip is connected to the gating circuit and the signal conditioning circuit, and is used to output the gating signal to the gating circuit to gate the first switching device and the second switching device, and perform a control strategy on an engine according to a temperature of the engine collected by the signal conditioning circuit.

[0033] The multi-channel signal acquisition circuit provided by the embodiment of the present application connects a switching device in series at both ends of each sensor, uses a gating signal to control the gating circuit to control the on-off of each switching device, and then controls the on-off of the circuit in which each sensor is connected between the first node and the second node. Only one sensor is gated and connected to the signal conditioning circuit at the same time, and the plurality of sensors input electrical signals to the signal conditioning circuit in time according to the switching of the gating circuit, so that one signal conditioning circuit can collect electrical signals of a plurality of sensors, the signal conditioning circuit does not need to correspond to each sensor, the number of pins / interfaces occupied by the plurality of sensors is reduced, the number of signal conditioning circuits required is reduced, and the utilization efficiency of the signal conditioning circuit is improved. In the case of a large number of sensors, the signal conditioning circuit only needs to be controlled based on a small number of control signal pins, thereby reducing the pins occupied by the control circuit for providing the control signal. Since the cost of the signal conditioning circuit is relatively high, the multi-channel signal acquisition circuit provided by the embodiment of the present application can greatly reduce the cost of the multi-channel signal acquisition circuit. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting, of the present application. Like reference numerals have been used wherever possible throughout the drawings and the following detailed description, to refer to like parts. In the drawings:

[0035] Figure 1 is a structural schematic of a multi-channel signal acquisition circuit provided by an embodiment of the present application Figure 1 ;

[0036] Figure 2 is a structural schematic of a multi-channel signal acquisition circuit provided by an embodiment of the present application Figure 2 ;

[0037] Figure 3 is a structural schematic of a signal conditioning circuit provided by an embodiment of the present application

[0038] Figure 4 is a structural schematic of a control device provided by an embodiment of the present application

[0039] Figure 5 is a schematic block diagram of a vehicle provided by an embodiment of the present application DETAILED DESCRIPTION

[0040] Example embodiments of the present disclosure will be described herein below with reference to the accompanying drawings. While example embodiments of the present disclosure are illustrated, it is to be understood that the present disclosure is not limited to the illustrated embodiments. Rather, the present disclosure is intended to encompass various forms that fall within the scope of the present disclosure as claimed. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0041] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0042] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0043] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0044] like Figure 1 As shown, according to an embodiment of this application, a multi-channel signal acquisition circuit is proposed, including: a first group of switching devices 11, a second group of switching devices 12, a gating circuit 13, and a signal conditioning circuit 14.

[0045] refer to Figure 1 The first group of switching devices 11 includes multiple switching devices: switching device 111, switching device 112, etc. Each of the first group of switching devices 11 corresponds one-to-one with a plurality of sensors 10. Each switching device in the first group of switching devices 11 is connected in series between the positive terminal of the corresponding sensor and the first node 161. Specifically, switching device 111 is connected in series between the positive terminal of sensor 101 and the first node 161, and switching device 112 is connected in series between the positive terminal of sensor 102 and the first node 161.

[0046] Each sensor of the plurality of sensors 10 is configured to sense a physical quantity and convert the physical quantity into a corresponding electrical signal. The physical quantity can be temperature, humidity, pressure, velocity, or other types of physical quantities. In some embodiments, the sensor is a temperature sensor. Further, the temperature sensor can be a resistance temperature sensor. For example, the sensor can be a Pt1000 resistance temperature sensor.

[0047] Referring to Figure 1 The second group of switching devices 12 corresponds to the plurality of sensors 10 one-to-one, and each switching device of the second group of switching devices 12 is connected in series between the negative electrode of the corresponding sensor and the second node. Specifically, the switching device 121 is connected in series between the negative electrode of the sensor 101 and the second node 162, and the switching device 112 is connected in series between the positive electrode of the sensor 102 and the second node 162.

[0048] The gating circuit 13 is connected to the first group of switching devices 11 and the second group of switching devices 12, and is configured to gate a first switching device of the first group of switching devices 11 and a second switching device of the second group of switching devices 12 according to a gate signal, and the first switching device and the second switching device both correspond to a first sensor of the plurality of sensors 10. The signal conditioning circuit 14 is connected to the first node 161 and the second node 162, and is configured to receive an electrical signal for conditioning the first sensor.

[0049] It should be noted that the first switching device and the second switching device are corresponding, and both correspond to the first sensor. The first sensor is not fixed, but is selected by the gate signal.

[0050] Exemplarily, in an application scenario, the correspondence between the first group of switching devices 11, the second group of switching devices 12, and the plurality of sensors 10 can be stored in a memory. When the controller wants to gate the first sensor, the controller can determine the first switching device corresponding to the first sensor in the first group of switching devices 11 and the second switching device corresponding to the first sensor in the second group of switching devices 12 according to the stored correspondence, and then output a corresponding gate signal to the gating circuit 13 to control the first switching device and the second switching device to be turned on and other switching devices to be turned off, so as to turn on the first sensor and the signal conditioning circuit 14.

[0051] The multi-channel signal acquisition circuit provided by the embodiment of the present application is provided with one switch device in series with each sensor at both ends of the sensor, the on-off of each switch device is controlled by using a gating signal to control the gating circuit, and the on-off of the circuit in which each sensor is connected between the first node and the second node is controlled, only one sensor is gated and conducted with the signal conditioning circuit at the same time, and the multiple sensors input the electric signals to the signal conditioning circuit in time according to the switching of the gating circuit, so that one signal conditioning circuit can acquire the electric signals of multiple sensors, the signal conditioning circuit does not need to be one-to-one corresponding to the sensor, the number of pins / interfaces occupied by the multiple sensors is reduced, the number of signal conditioning circuits required to be used is reduced, and the utilization efficiency of the signal conditioning circuit is improved. In the case that the number of sensors is large, the signal conditioning circuit only needs to be based on a small number of control signal pins to control multiple sensors, and the pins occupied by the control circuit for providing the control signal are reduced. Since the cost of the signal conditioning circuit is relatively high, the multi-channel signal acquisition circuit provided by the embodiment of the present application can greatly reduce the cost of the multi-channel signal acquisition circuit.

[0052] In some embodiments, each of the above-mentioned switch devices can be an optical coupler. The optical coupler, also known as the photoelectric coupler, can be simply referred to as an optical coupler, which is an electric-optical-electric conversion device that transmits electric signals through light. The optical coupler includes a light-emitting diode and a photosensitive device, and the light-emitting diode emits light by being electrically conducted, and the light of the light-emitting diode excites the photosensitive device to be conducted, thereby realizing the conversion of electric-optical-electric.

[0053] The light-emitting diode of each optical coupler is controlled to be turned on and off by a gating signal, and the photosensitive device of each optical coupler is controlled to be turned on and off by a light signal of the light-emitting diode.

[0054] The photosensitive device of each switch device in the first group of switch devices 11 is connected in series between the positive electrode of the corresponding sensor and the first node 161, and the photosensitive device of each switch device in the second group of switch devices 12 is connected in series between the negative electrode of the corresponding sensor and the second node 162. The gating circuit 13 is connected with the light-emitting diode of each switch device in the first group of switch devices 11 and the light-emitting diode of each switch device in the second group of switch devices 12.

[0055] Reference Figure 2The light-sensitive device 1111 of the switching device 111 is connected in series between the positive electrode of the sensor 101 and the first node 161, and the light-emitting diode 1112 of the switching device 111 is connected to the gating circuit 13. The light-sensitive device 1121 of the switching device 112 is connected in series between the positive electrode of the sensor 102 and the first node 161, and the light-emitting diode 1122 of the switching device 112 is connected to the gating circuit 13. The light-sensitive device 1211 of the switching device 121 is connected in series between the negative electrode of the sensor 101 and the second node 162, and the light-emitting diode 1212 of the switching device 121 is connected to the gating circuit 13. The light-sensitive device 1221 of the switching device 122 is connected in series between the negative electrode of the sensor 102 and the second node 162, and the light-emitting diode 1222 of the switching device 122 is connected to the gating circuit 13.

[0056] The switching function of the switching device can be realized by using the low impedance characteristic of the photo-coupler. The photo-coupler is used to isolate the gating signal from the sensor acquisition circuit, thereby reducing the influence of the gating signal on the board circuit.

[0057] Reference Figure 2 In some embodiments, the gating circuit 13 includes a first gating sub-circuit 131 and a second gating sub-circuit 132, and the gating signal includes a first sub-gating signal and a second sub-gating signal. The first gating sub-circuit 131 is connected to the light-emitting diode of each switching device in the first group of switching devices 11, and is used to gate the light-emitting diode of the first switching device according to the first sub-gating signal. The second gating sub-circuit 132 is connected to the light-emitting diode of each switching device in the second group of switching devices 12, and is used to gate the light-emitting diode of the second switching device according to the second sub-gating signal.

[0058] Two gating sub-circuits are provided in the gating circuit to control the two groups of switching devices, which can more flexibly manage the switching devices, improve the logic of the circuit, each gating sub-circuit can independently control the corresponding group of switching devices, reduce the mutual interference between different switching devices, improve the stability and reliability of the system, and help fault diagnosis and circuit maintenance.

[0059] In some embodiments, the first gating sub-circuit includes a plurality of first input pins, the plurality of first input pins are connected to the negative electrodes of the light-emitting diodes of the switching devices in the first group of switching devices one by one, the second gating sub-circuit includes a plurality of second input pins, the plurality of second input pins are connected to the negative electrodes of the light-emitting diodes of the switching devices in the second group of switching devices one by one, and the positive electrodes of the light-emitting diodes of the switching devices are connected to the power supply. It can be understood that the first input pin represents any input pin in the first gating sub-circuit, and the second input pin represents any input pin in the second gating sub-circuit.

[0060] Reference Figure 2An input pin of the first gating sub-circuit 131 is connected with the negative electrode of the light-emitting diode of the switching device 111, and another input pin of the first gating sub-circuit 131 is connected with the negative electrode of the light-emitting diode of the switching device 112. An input pin of the second gating sub-circuit 132 is connected with the negative electrode of the light-emitting diode of the switching device 121, and another input pin of the second gating sub-circuit 132 is connected with the negative electrode of the light-emitting diode of the switching device 122. The positive electrodes of the switching device 111, the switching device 112, the switching device 121 and the switching device 122 are all connected with the power supply VCC.

[0061] Since the gating signals of each light-emitting diode are independent, the mutual interference between different switching devices can be reduced, and the stability of the signal can be improved.

[0062] Reference Figure 2 In some embodiments, the multi-channel signal acquisition circuit provided by the embodiments of the present application further includes a control chip 15 connected with the control end of the first gating sub-circuit 131 and the control end of the second gating sub-circuit 132, for inputting a first sub-gating signal to the control end of the first gating sub-circuit 131 and inputting a second sub-gating signal to the control end of the second gating sub-circuit 132. Optionally, the control chip 15 can be a microcontroller unit (MCU). When the model of the single-chip microcomputer used by the control chip 15 is selected, the multi-channel signal acquisition circuit provided by the embodiments of the present application can reduce the number of control signal pins occupied, thereby reducing the difficulty of selecting the single-chip microcomputer.

[0063] By respectively setting two gating sub-circuits, the control chip can independently control each gating sub-circuit, which can simplify the design and maintenance work of the circuit, because each gating sub-circuit and the corresponding switching device group controlled thereby can be designed and maintained as a relatively independent circuit module, which is easy to diagnose and repair.

[0064] In some embodiments, the first gating sub-circuit and / or the second gating sub-circuit is a decoder. Optionally, a 38 decoder can be selected. By setting appropriate input codes (gating signals) for the decoder, the decoder can selectively activate a specific output line, helping to realize the operation of data selection and multiplexing. The use of the decoder can improve the data transmission efficiency, reduce the error rate, and especially ensure the reliability of data transmission in complex circuits.

[0065] In some embodiments, the signal conditioning circuit 14 is an analog-to-digital converter (ADC) chip. Optionally, an ADS1120 chip can be selected. The ADS1120 chip is widely used in industrial control, sensor interface and other fields, and has the characteristics of high performance and low power consumption, thereby improving the accuracy and stability of data acquisition. Figure 3The ADS1120 chip provides differential input mode and internally includes components such as a multiplexer (MUX), a low-noise programmable gain amplifier (PGA), and an analog-to-digital converter (ADC). In differential input mode, the MUX selects two differential signals input from two pins (pin 141 and pin 142), connecting the positive and negative input terminals of the two differential signals to the PGA respectively. The PGA provides gain to amplify the smaller sensor signal before it is connected to the two input terminals of the ADC. The ADC then compares the electrical signal from the first sensor with a reference resistor R. REF The electrical signals are compared, and the sampled values ​​are output, thereby realizing differential signal measurement.

[0066] refer to Figure 2 The analog-to-digital converter (ADC) chip (signal conditioning circuit 14) includes a first pin 141 and a second pin 142. The first pin 141 is connected to a first node 161, and the second pin 142 is connected to a second node 162. The ADC chip outputs sampled values ​​based on the electrical signals input to the first pin 141 and the second pin 142. The ADC chip converts analog signals (electrical signals) into digital signals (sampled values), enabling the digital system to process and analyze the signals, facilitating the digital control system to execute subsequent control based on the signals.

[0067] The following is about Figure 2 ( Figure 2 The working principle and process of the circuit shown (taking a two-channel acquisition circuit with a PT1000 temperature sensor as an example) are described below:

[0068] After multiple PT1000 signals are input to the multi-channel signal acquisition circuit, they first enter the optocouplers. The LEDs of the optocouplers can be selected by a variable decoder. When two optocouplers connected to the positive and negative signals of the same PT1000 are selected, that PT1000 signal can pass through the optocouplers and enter the signal conditioning circuit 14. The resistive signal of the PT1000 is then processed by the ADS1120 (signal conditioning circuit 14) after entering the signal conditioning circuit. The ADS1120 generates a stable current source that flows through the PT1000 and the reference resistor (reference resistor). Figure 3 Reference resistor R REF The series circuit consisting of PT1000 and a reference resistor, based on the principle that the current of components in a series circuit is equal, allows calculation of the current resistance of PT1000 by comparing the voltages across PT1000 and the reference resistor. The current measured temperature of PT1000 can then be obtained by looking up a table. The specific formula is as follows:

[0069] U PT1000 / R PT1000 =U REF / R REF

[0070] UPT1000 is the voltage of PT1000, R PT1000 is the resistance value of PT1000, U REF is the voltage of the reference resistance, R REF is the resistance value of the reference resistance.

[0071] In summary, a one-to-many PT1000 temperature acquisition work can be completed.

[0072] It can be understood that Figure 1 and Figure 2 Taking a two-way signal acquisition circuit as an example, in application, the circuit can be expanded according to the actual required number of sensors, and the embodiments of the application will not be exemplified one by one.

[0073] The multi-way signal acquisition circuit provided by the embodiments of the application can occupy fewer pins of the control circuit / control chip generating the control signal, and can use fewer signal conditioning circuits. In addition to reducing the cost of the controller, it is also easier to realize the replacement of components. In some embodiments, by using the optical coupler, the circuit module where the control signal is located and the circuit module where the collected electrical signal is located are decoupled, reducing the influence of the control signal on the collected electrical signal.

[0074] The embodiments of the application also provide a control device including the multi-way signal acquisition circuit provided by any of the technical solutions of the embodiments of the application. Optionally, the control device can be an electronic control unit (ECU for short), which is applied in the technical fields of automobiles, ships, industrial automation, aerospace, agriculture, etc., to help realize multi-way signal acquisition and execute corresponding control strategies according to the collected signal feedback.

[0075] Specifically, referring to Figure 4 A control device 40 provided by the embodiments of the application includes a multi-way signal acquisition circuit 401 and a control chip 402.

[0076] The multi-way signal acquisition circuit 401 includes: a first group of switching devices, the first group of switching devices corresponding to a plurality of sensors one-to-one, each switching device in the first group of switching devices being connected in series between the positive electrode of the corresponding sensor and a first node; each sensor in the plurality of sensors being used to sense a physical quantity and convert it into a corresponding electrical signal; a second group of switching devices, the second group of switching devices corresponding to the plurality of sensors one-to-one, each switching device in the second group of switching devices being connected in series between the negative electrode of the corresponding sensor and a second node; a gating circuit 13 connected with the first group of switching devices and the second group of switching devices, used to gate a first switching device in the first group of switching devices and a second switching device in the second group of switching devices according to a gating signal, and the first switching device and the second switching device both corresponding to a first sensor in the plurality of sensors; a signal conditioning circuit 14 connected with the first node and the second node, used to receive the electrical signal of the first sensor for conditioning.

[0077] The control chip 402 is connected with the gating circuit 13 and the signal conditioning circuit 14, and is configured to output a gating signal to the gating circuit 13 to gate the first switch device and the second switch device, and perform a control strategy according to the conditioned electrical signal of the signal conditioning circuit 14. Optionally, the specific implementation of the control chip 402 includes but is not limited to: a central processing unit (CPU), a micro control unit (MCU), a system on chip (SOC), and the like.

[0078] The control device provided by the embodiments of the present application can simultaneously collect signals from multiple sensors through the multi-channel signal acquisition circuit, and can be widely applied in various complex systems, such as automobiles, ships, industrial automation, and the like, to meet the needs of monitoring various physical quantities in different scenarios. For example, in an automobile, the engine speed, oil pressure, temperature, and the like can be simultaneously collected to provide comprehensive data support for intelligent control of the vehicle. Due to the design of the multi-channel signal acquisition circuit, the control device can flexibly increase or decrease the number and types of sensors according to actual needs. This scalability enables the control device to adapt to changing application scenarios and technology upgrades, and reduces the upgrade and maintenance costs of the system.

[0079] The embodiments of the present application also provide a vehicle including the control device provided by the embodiments of the present application. Referring to Figure 5 , the vehicle 50 includes an engine 501, multiple temperature sensors 502, and the control device 40.

[0080] The multiple temperature sensors 502 are configured to sense the temperature of the engine 501. In some embodiments, the engine 501 includes multiple cylinders, and at least one temperature sensor 502 can be arranged in each cylinder. It can be understood that in addition to monitoring the temperature of the engine 501, the multiple temperature sensors 502 can also be applied to measure other temperatures, or the vehicle 50 can further include sensors connected with the control device 40 for monitoring other physical quantities.

[0081] The control device 40 comprises a multi-channel signal acquisition circuit 401 and a control chip 402. The multi-channel signal acquisition circuit 401 comprises a first group of switching devices, the first group of switching devices corresponding to the plurality of temperature sensors 502 one by one, each switching device in the first group of switching devices being connected in series between the positive electrode of the corresponding temperature sensor 502 and a first node; each temperature sensor 502 in the plurality of temperature sensors 502 is used to sense a physical quantity and convert it into a corresponding electrical signal; a second group of switching devices, the second group of switching devices corresponding to the plurality of temperature sensors 502 one by one, each switching device in the second group of switching devices being connected in series between the negative electrode of the corresponding temperature sensor 502 and a second node; a gating circuit 13 connected with the first group of switching devices and the second group of switching devices, used to gate a first switching device in the first group of switching devices and a second switching device in the second group of switching devices according to a gating signal, and the first switching device and the second switching device both correspond to a first temperature sensor 502 in the plurality of temperature sensors 502; a signal conditioning circuit 14 connected with the first node and the second node, used to receive the electrical signal of the first temperature sensor 502 for conditioning; the control chip is connected with the gating circuit and the signal conditioning circuit, and is used to output the gating signal to the gating circuit 13 to gate the first switching device and the second switching device, and execute a control strategy on the engine 501 according to the temperature of the engine 501 collected by the signal conditioning circuit 14. Optionally, the control device 40 can also be connected with a display screen arranged in the vehicle 50 to display the current temperature of the engine 501.

[0082] The vehicle provided by the embodiment of the application adopts the control device provided by the embodiment of the application to execute the control strategy. Since the control device adopts the multi-channel signal acquisition circuit provided by the embodiment of the application, the circuit structure is simplified, the accuracy of monitoring the engine temperature signal is improved, and the adaptability of the control strategy to different actual environments is enhanced. Through these optimization measures, the service life of the engine can be prolonged.

[0083] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited to this. Any changes or replacements that can be easily thought of by those skilled in the art within the technical range disclosed in the application should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A multiplexed signal acquisition circuit, comprising: The application relates to a multi-channel signal acquisition circuit. The first group of switch devices correspond to the plurality of sensors one by one, and each switch device in the first group of switch devices is connected in series between the positive electrode of the corresponding sensor and a first node; each sensor in the plurality of sensors is used for sensing a physical quantity and converting the physical quantity into a corresponding electrical signal; The second group of switch devices correspond to the plurality of sensors one by one, and each switch device in the second group of switch devices is connected in series between the negative electrode of the corresponding sensor and a second node; The gating circuit is connected with the first group of switch devices and the second group of switch devices, and is used for gating a first switch device in the first group of switch devices and a second switch device in the second group of switch devices according to a gate signal; the first switch device and the second switch device both correspond to a first sensor in the plurality of sensors; The signal conditioning circuit is connected with the first node and the second node, and is used for receiving an electrical signal of the first sensor for conditioning.

2. The multi-channel signal acquisition circuit of claim 1, wherein, The switch device is an optical coupler, each optical coupler comprises a light-emitting diode controlled by the gate signal and a photosensitive device controlled by the light signal of the light-emitting diode; The photosensitive device of each switch device in the first group of switch devices is connected in series between the positive electrode of the corresponding sensor and the first node; The photosensitive device of each switch device in the second group of switch devices is connected in series between the negative electrode of the corresponding sensor and the second node; The gating circuit is connected with the light-emitting diode of each switch device in the first group of switch devices and the light-emitting diode of each switch device in the second group of switch devices.

3. The multi-channel signal acquisition circuit of claim 2, wherein, The gating circuit comprises a first gating sub-circuit and a second gating sub-circuit; the gate signal comprises a first sub-gate signal and a second sub-gate signal; The first gating sub-circuit is connected with the light-emitting diode of each switch device in the first group of switch devices, and is used for gating the light-emitting diode of the first switch device according to the first sub-gate signal; The second gating sub-circuit is connected with the light-emitting diode of each switch device in the second group of switch devices, and is used for gating the light-emitting diode of the second switch device according to the second sub-gate signal.

4. The multi-channel signal acquisition circuit of claim 3, wherein, The first gating sub-circuit comprises a plurality of first input pins, and the plurality of first input pins are connected with the negative electrodes of the light-emitting diodes of each switch device in the first group of switch devices one by one; The second gating sub-circuit comprises a plurality of second input pins, and the plurality of second input pins are connected with the negative electrodes of the light-emitting diodes of each switch device in the second group of switch devices one by one; The positive electrodes of the light-emitting diodes of each switch device are connected with a power supply.

5. The multi-channel signal acquisition circuit of claim 3, wherein, The multi-channel signal acquisition circuit further comprises: The control chip is connected with the control ends of the first gating sub-circuit and the second gating sub-circuit, and is used for inputting the first sub-gate signal to the control end of the first gating sub-circuit and inputting the second sub-gate signal to the control end of the second gating sub-circuit.

6. The multi-channel signal acquisition circuit of claim 3, wherein, The first gating sub-circuit and / or the second gating sub-circuit is a decoder.

7. The multi-channel signal acquisition circuit of claim 1, wherein, The signal conditioning circuit is an analog-to-digital converter chip.

8. The multi-channel signal acquisition circuit of claim 7, wherein, The analog-to-digital converter chip comprises a first pin and a second pin, the first pin is connected with the first node, and the second pin is connected with the second node; the analog-to-digital converter chip is used for outputting a sampling value according to the electrical signal of the first sensor input by the first pin and the second pin.

9. A control device characterized by comprising: The control device comprises: The multi-channel signal acquisition circuit comprises: a first group of switching devices, the first group of switching devices correspond to a plurality of sensors one by one, each switching device in the first group of switching devices is connected in series between the positive electrode of the corresponding sensor and a first node; each sensor in the plurality of sensors is used for sensing a physical quantity and converting it into a corresponding electrical signal; a second group of switching devices, the second group of switching devices correspond to the plurality of sensors one by one, each switching device in the second group of switching devices is connected in series between the negative electrode of the corresponding sensor and a second node; a gating circuit connected with the first group of switching devices and the second group of switching devices, used for gating a first switching device in the first group of switching devices and a second switching device in the second group of switching devices according to a gate signal, and the first switching device and the second switching device both correspond to a first sensor in the plurality of sensors; a signal conditioning circuit connected with the first node and the second node, used for receiving and conditioning the electrical signal of the first sensor; A control chip connected with the gating circuit and the signal conditioning circuit, the control chip is used for outputting the gate signal to the gating circuit to gate the first switching device and the second switching device, and executing a control strategy according to the conditioned electrical signal of the signal conditioning circuit.

10. A vehicle characterized by comprising: The vehicle comprises: An engine; A plurality of temperature sensors used for sensing the temperature of the engine; The control device comprises a multi-channel signal acquisition circuit and a control chip; the multi-channel signal acquisition circuit comprises a first group of switching devices corresponding to a plurality of temperature sensors one by one, each of the switching devices in the first group of switching devices is connected in series between the positive electrode of the corresponding temperature sensor and a first node; each of the temperature sensors in the plurality of temperature sensors is used to sense a physical quantity and convert it into a corresponding electrical signal; a second group of switching devices corresponding to the plurality of temperature sensors one by one, each of the switching devices in the second group of switching devices is connected in series between the negative electrode of the corresponding temperature sensor and a second node; a gating circuit connected with the first group of switching devices and the second group of switching devices, used to gate a first switching device in the first group of switching devices and a second switching device in the second group of switching devices according to a gating signal, and the first switching device and the second switching device both correspond to a first temperature sensor in the plurality of temperature sensors; a signal conditioning circuit connected with the first node and the second node, used to receive an electrical signal for conditioning the first temperature sensor; the control chip is connected with the gating circuit and the signal conditioning circuit, and the control chip is used to output the gating signal to the gating circuit to gate the first switching device and the second switching device, and execute a control strategy on the engine according to the temperature of the engine collected by the signal conditioning circuit.

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