Signal acquisition circuit and system

Abstract

The utility model provides a signal acquisition circuit and system. The signal acquisition circuit comprises at least two sampling circuits; one end of each acquisition circuit in the at least two sampling circuits is connected with the same signal acquisition unit; the at least two sampling circuits connected with the same signal acquisition unit comprise an active sampling circuit and a passive sampling circuit. According to the invention, at least two sampling circuits are arranged for the same signal acquisition unit, multi-path signal redundancy acquisition is formed, when one sampling circuit is abnormal, other sampling circuits can maintain a normal acquisition function, and the stability of signal acquisition can be improved. And the sampling circuit comprises an active sampling circuit and a passive sampling circuit, and the active sampling circuit and the passive sampling circuit belong to two sampling circuits with different power supply modes, so that the signal acquisition stability of the signal acquisition circuit in different power supply states can be improved, and the application scenarios of the signal acquisition circuit are increased.

Description

Technical Field

[0001] The present application relates to the field of information acquisition, and in particular, to a signal acquisition circuit and system. Background Art

[0002] Signal acquisition refers to the process of acquiring data from various sources, including but not limited to hardware devices, the Internet, sensors, databases, data interfaces, etc. The purpose of signal acquisition is to collect and organize data for further processing, analysis and application to support decision-making and problem solving.

[0003] In automotive electronic systems, signal acquisition circuits are key components of automotive electronic systems and are responsible for real-time acquisition and processing of various sensor signals, such as brake system signals and accelerator pedal signals. However, in practical applications, due to the high requirements for vehicle operation safety, the requirements for signal monitoring of equipment that affects vehicle safety are also correspondingly high. However, the stability of current signal acquisition circuits is difficult to meet monitoring requirements. Utility Model Content

[0004] In view of this, an object of the embodiments of the present application is to provide a signal acquisition circuit and system that can improve the stability of signal acquisition.

[0005] In a first aspect, an embodiment of the present application provides a signal acquisition circuit, comprising: at least two sampling circuits; one end of each of the at least two sampling circuits is connected to the same signal acquisition unit; wherein the at least two sampling circuits connected to the same signal acquisition unit include an active sampling circuit and a passive sampling circuit.

[0006] In the above implementation process, at least two sampling circuits are set for the same signal acquisition unit to form redundant acquisition of multiple signals. When one sampling circuit is abnormal, the other sampling circuits can maintain normal acquisition functions, which can improve the stability of signal acquisition. In addition, by setting the sampling circuit connected to the same signal acquisition unit to include an active sampling circuit and a passive sampling circuit, since the active sampling circuit and the passive sampling circuit belong to sampling circuits with two different power supply modes, when the active sampling circuit is powered abnormally, the passive sampling circuit can maintain normal signal sampling, thereby improving the stability of the signal acquisition circuit in signal acquisition under different power supply states and increasing the application scenarios of the signal acquisition circuit.

[0007] In one embodiment, the at least two sampling circuits connected to the same signal acquisition unit include: a sampling circuit that performs sampling by a signal processing method and a sampling circuit that performs sampling by a signal selection method.

[0008] In the above implementation process, by setting a sampling circuit connected to the same signal acquisition unit to perform sampling through different sampling methods, it is possible to obtain signal information from different angles and levels, thereby improving the accuracy and stability of signal sampling.

[0009] In one embodiment, the active sampling circuit includes: a general operational amplifier circuit and / or a differential operational amplifier circuit; the passive sampling circuit includes: an RC circuit and / or an LC circuit.

[0010] In the above implementation process, by setting the active sampling circuit to include: a general operational amplifier circuit and / or a differential operational amplifier circuit, wherein the general operational amplifier circuit is suitable for most application scenarios, and the differential operational amplifier circuit is suitable for small current application scenarios, the corresponding active sampling circuit can be selected in different application scenarios to increase the sampling scenarios of the active sampling circuit. In addition, by setting the passive sampling circuit to include: an RC circuit and / or an LC circuit, wherein the RC circuit is suitable for low-frequency oscillation scenarios, and the LC circuit is suitable for high-frequency oscillation scenarios, the corresponding passive sampling circuit can be selected in different application scenarios to increase the sampling scenarios of the passive sampling circuit.

[0011] In one embodiment, there are two sampling circuits, which are an RC circuit and a universal operational amplifier circuit respectively; one end of the RC circuit is connected to the output end of the signal acquisition unit, and the other end of the RC circuit is connected to the signal receiving unit; one end of the universal operational amplifier circuit is connected to the output end of the signal acquisition unit, and the other end of the universal operational amplifier circuit is connected to the signal receiving unit; wherein the RC circuit and the universal operational amplifier circuit are configured to obtain the signal collected by the same signal acquisition unit.

[0012] In the above implementation process, by setting the same signal acquisition unit to connect two sampling circuits, and the two sampling circuits are respectively an RC circuit and a general operational amplifier circuit, so that the same signal acquisition unit is connected to an active sampling circuit and a passive sampling circuit at the same time, it is possible to collect the signal collected by the signal acquisition unit under different working conditions, thereby improving the stability of the signal acquisition circuit in signal acquisition under different working conditions and increasing the application scenarios of the signal acquisition circuit.

[0013] In one embodiment, the RC circuit includes: a first capacitor and a first resistor; the first end of the first resistor is connected to the output end of the signal acquisition unit, and the second end of the first resistor is connected to the first end of the first capacitor and the signal receiving unit; the second end of the first capacitor is grounded.

[0014] In the above implementation process, by setting the sampling circuit to an RC circuit, when there is a fast surge in the signal acquisition circuit and the controller voltage fluctuates, the RC circuit can maintain the normal acquisition function, thereby increasing the stability of signal acquisition of the signal acquisition circuit under abnormal conditions such as voltage fluctuations.

[0015] In one embodiment, the general operational amplifier circuit includes: a second capacitor, a second resistor, a third capacitor, a third resistor and a first operational amplifier; the first end of the second resistor is connected to the output end of the signal acquisition unit, and the second end of the second resistor is connected to the first end of the second capacitor and the first end of the first operational amplifier; the second end of the first operational amplifier is connected to the third end of the first operational amplifier and the first end of the third resistor; the second end of the third resistor is connected to the first end of the third capacitor and the signal receiving unit; the second end of the second capacitor and the second end of the third capacitor are grounded.

[0016] In the above implementation process, by setting the sampling circuit as a general operational amplifier circuit, when the signal acquisition circuit is in a strong electromagnetic compatibility environment and / or a high temperature environment, the general operational amplifier circuit can maintain normal acquisition function, thereby increasing the stability of signal acquisition of the signal acquisition circuit in abnormal environments.

[0017] In one embodiment, the LC circuit includes: a first inductor and a fourth capacitor; the first end of the first inductor is connected to the output end of the signal acquisition unit, the second end of the first inductor is connected to the first end of the fourth capacitor and the signal receiving unit; the second end of the fourth capacitor is grounded.

[0018] In the above implementation process, by setting the sampling circuit to an LC circuit, the LC circuit can maintain normal acquisition function in a low-frequency and high-energy interference scenario, thereby increasing the stability of the signal acquisition circuit in signal acquisition in a low-frequency and high-energy interference scenario.

[0019] In one embodiment, the differential operational amplifier circuit includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor and a second operational amplifier; the first end of the fourth resistor is connected to the output end of the signal acquisition unit, and the second end of the fourth resistor is connected to the first end of the fifth capacitor, the first end of the sixth resistor and the first end of the second operational amplifier; the first end of the fifth resistor is connected to the output end of the signal acquisition unit, and the second end of the fifth resistor is connected to the first end of the sixth capacitor and the second end of the second operational amplifier; the second end of the second operational amplifier is connected to the first end of the seventh resistor, and the third end of the second operational amplifier is connected to the second end of the seventh resistor and the first end of the eighth resistor; the second end of the eighth resistor is connected to the first end of the seventh capacitor and the signal receiving unit; the second end of the sixth resistor, the second end of the fifth capacitor, the second end of the sixth capacitor and the second end of the seventh capacitor are grounded.

[0020] In the above implementation process, by setting the sampling circuit as a differential operational amplifier circuit, the LC circuit can maintain a normal acquisition function in a low current scenario, thereby increasing the stability of the signal acquisition circuit in signal acquisition in a low current scenario.

[0021] In a second aspect, an embodiment of the present application further provides a signal acquisition system, comprising: a signal acquisition unit and the signal acquisition circuit in the above-mentioned first aspect, or any one embodiment of the first aspect; the signal acquisition unit is connected to one end of at least two of the sampling circuits; wherein the multiple sampling circuits connected to the same signal acquisition unit include active sampling circuits and passive sampling circuits.

[0022] In the above implementation process, at least two sampling circuits are set for the same signal acquisition unit to form redundant acquisition of multiple signals. When one sampling circuit is abnormal, the other sampling circuits can maintain normal acquisition functions, which can improve the stability of signal acquisition. In addition, by setting the sampling circuit connected to the same signal acquisition unit to include an active sampling circuit and a passive sampling circuit, since the active sampling circuit and the passive sampling circuit belong to sampling circuits with two different power supply modes, when the active sampling circuit is powered abnormally, the passive sampling circuit can maintain normal signal sampling, thereby improving the stability of the signal acquisition circuit in signal acquisition under different power supply states and increasing the application scenarios of the signal acquisition circuit.

[0023] In one embodiment, each of the monitored devices is equipped with a plurality of signal acquisition units; each of the signal acquisition units is connected to one end of at least two of the sampling circuits; wherein the plurality of signal acquisition units are configured to acquire a plurality of signals corresponding to the monitored devices, and the sampling circuits connected to each of the signal acquisition units include the active sampling circuit and the passive sampling circuit.

[0024] In the above implementation process, each signal acquisition unit is connected to at least two sampling circuits to form multi-channel signal redundant acquisition. When one sampling circuit is abnormal, other sampling circuits can maintain normal acquisition functions, thereby improving the stability of signal acquisition.

[0025] In one embodiment, it also includes: a signal receiving unit; the sampling circuit is connected to the signal receiving unit at one end away from the signal acquisition unit; the signal receiving unit includes a plurality of receiving modules, and each sampling circuit is connected to one receiving module; or, there are a plurality of signal receiving units, and each sampling circuit is connected to one signal receiving unit.

[0026] In the above implementation process, by setting each sampling circuit to be connected to a receiving module or each sampling circuit to be connected to a signal receiving unit, when one receiving module or signal receiving unit fails, another receiving module or signal receiving unit can maintain normal acquisition function, thereby increasing the stability of the signal receiving unit receiving the signal, thereby improving the stability of the entire signal acquisition system.

[0027] In one embodiment, the signal acquisition unit is disposed on one or more devices in a braking system, an accelerator pedal, and a power system.

[0028] In the above implementation process, since the braking system, accelerator pedal and power system are devices with high safety requirements, by setting the signal acquisition unit on these devices with high safety requirements, redundant acquisition of these devices with high safety requirements is achieved, thereby improving the safety level of the equipment in the braking system, accelerator pedal and power system, and thus improving the safety of the entire vehicle.

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A block diagram of a signal acquisition circuit provided in an embodiment of the present application;

[0032] Figure 2 The sampling circuits provided in the embodiments of the present application are respectively a schematic diagram of a signal acquisition circuit of an RC circuit and a general operational amplifier circuit;

[0033] Figure 3 The sampling circuits provided in the embodiments of the present application are respectively a schematic diagram of a signal acquisition circuit of an LC circuit and a differential operational amplifier circuit;

[0034] Figure 4 Schematic diagram of a signal acquisition system provided in an embodiment of the present application.

[0035] Description of the drawings: 110-passive sampling circuit, 120-active sampling circuit, 300-signal acquisition unit, 200-signal receiving unit, C1-first capacitor, R1-first resistor, C2-second capacitor, R2-second resistor, C3-third capacitor, R3-third resistor, V1-first operational amplifier, L1-first inductor, C4-fourth capacitor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, R7-seventh resistor, R8-eighth resistor, C5-fifth capacitor, C6-sixth capacitor, C7-seventh capacitor, V2-second operational amplifier, R9-ninth resistor, C8-eighth capacitor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are conventional orientations or positional relationships when the application products are used. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be interpreted as a limitation of the present application.

[0040] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In current automotive electronic control systems, acquisition circuits are the key link responsible for acquiring and processing sensor signals.

[0042] For cars, especially electric cars, stable signal monitoring and precise regulation are crucial. Especially for some devices with higher safety levels, such as accelerator pedals and brakes, if the monitored signal error is large, it will affect driving safety and may even affect personal safety. However, the current signal acquisition circuit may be difficult to meet the above high stability requirements.

[0043] In view of this, the present application proposes a signal acquisition circuit, in which at least two sampling circuits are set for the same signal acquisition unit to form redundant acquisition of multiple signals. When one sampling circuit is abnormal, the other sampling circuits can maintain normal acquisition functions, which can improve the stability of signal acquisition. In addition, by setting the sampling circuit connected to the same signal acquisition unit to include an active sampling circuit and a passive sampling circuit, since the active sampling circuit and the passive sampling circuit belong to sampling circuits with two different power supply modes, when the active sampling circuit is powered abnormally, the passive sampling circuit can maintain normal signal sampling, thereby improving the stability of the signal acquisition circuit in signal acquisition under different power supply states and increasing the application scenarios of the signal acquisition circuit.

[0044] To facilitate understanding of this embodiment, a signal acquisition circuit disclosed in an embodiment of the present application is first introduced in detail.

[0045] See also Figure 1 , is a structural diagram of a signal acquisition circuit provided in an embodiment of the present application, comprising: at least two sampling circuits.

[0046] One end of each of the at least two sampling circuits is connected to the same signal acquisition unit 300 .

[0047] The signal acquisition unit 300 here is used to collect signals from the monitored device. The signal acquisition unit 300 can be a pressure sensor, a temperature sensor, a vehicle speed sensor, a force sensor, a camera, etc. The monitored device can be an accelerator pedal, a brake, an engine, a battery system, etc. The signal acquisition unit 300 and the monitored device can be selected according to actual conditions.

[0048] It should be understood that, in order to improve the accuracy of monitoring, a plurality of signal acquisition units 300 may be provided on a monitored device, and the plurality of signal acquisition units 300 provided on the same monitored device are used to collect one or more signal information of the monitored device. Each signal acquisition unit 300 is connected to at least two sampling circuits, and the sampling circuits are configured to obtain the signal of the monitored device collected by the information acquisition unit.

[0049] Optionally, the multiple signal acquisition units 300 provided on the same monitored device may be signal acquisition units 300 of the same type, or may not be signal acquisition units 300 of the same type, or may partially be signal acquisition units 300 of the same type.

[0050] The at least two sampling circuits connected to the same signal acquisition unit 300 include an active sampling circuit 120 and a passive sampling circuit 110 .

[0051] The active sampling circuit 120 here refers to a circuit using active components (such as transistors, operational amplifiers, etc.). The active sampling circuit 120 refers to a circuit using passive components (such as resistors, inductors, etc.). The active sampling circuit 120 requires additional power supply, while the passive sampling circuit 110 does not require additional power supply.

[0052] In the above implementation process, at least two sampling circuits are set for the same signal acquisition unit 300 to form multi-channel signal acquisition / redundant acquisition. When one sampling circuit is abnormal, the other sampling circuits can maintain normal acquisition functions, which can improve the stability of signal acquisition. In addition, by setting the sampling circuit connected to the same signal acquisition unit 300 to include an active sampling circuit 120 and a passive sampling circuit 110, since the active sampling circuit 120 and the passive sampling circuit 110 belong to two sampling circuits with different power supply modes, the stability of the signal acquisition circuit in signal acquisition under different power supply states is improved, and the application scenarios of the signal acquisition circuit are increased.

[0053] In a possible implementation, the at least two sampling circuits connected to the same signal acquisition unit 300 include: a sampling circuit that performs sampling in a signal processing manner and a sampling circuit that performs sampling in a signal selection manner.

[0054] The signal processing method here may include one or more processing methods of signal amplification, reverse proportional processing, in-phase proportional processing, summation processing, integration processing and differentiation processing. The specific method of the signal processing can be selected according to actual conditions.

[0055] The above signal selection method refers to allowing or blocking signals within a specific frequency range, such as removing high-frequency noise, eliminating low-frequency interference, etc. The specific method of signal selection can be selected according to actual conditions.

[0056] It should be understood that, from the perspective of signal processing methods, by setting at least two sampling circuits connected to the same signal acquisition unit 300 to adopt different signal processing methods, the stability of signal sampling of the signal acquisition circuit under different working conditions can be increased.

[0057] From the perspective of power supply mode, by providing at least two sampling circuits connected to the same signal acquisition unit 300, including an active sampling circuit and a passive sampling circuit, the stability of signal sampling of the signal acquisition circuit under different power supply states can be increased.

[0058] In the above implementation process, by setting the sampling circuit connected to the same signal acquisition unit 300 to perform sampling through different sampling methods, it is possible to obtain signal information from different angles and levels, thereby improving the accuracy and stability of signal sampling.

[0059] In a possible implementation, the active sampling circuit 120 includes: a general operational amplifier circuit and / or a differential operational amplifier circuit; and the passive sampling circuit 110 includes: an RC circuit and / or an LC circuit.

[0060] The general op amp circuit and differential op amp circuit here are both types of op amp circuits. Among them, the general op amp circuit is a more commonly used op amp circuit, and its performance indicators can meet the requirements of most applications. The differential op amp circuit is a special op amp circuit, which is more commonly used in scenarios such as processing differential signals or performing precise signal measurements. Compared with the general op amp circuit, the differential op amp circuit is more suitable for small current application scenarios.

[0061] The above-mentioned RC circuit is a resistor-capacitor circuit, which is often used to generate an oscillation signal of a specified frequency and is more commonly used in low-frequency oscillation scenarios. The LC circuit is an inductor-capacitor circuit, which is often used to generate a high-frequency oscillation signal and is more commonly used in high-frequency oscillation scenarios.

[0062] It should be understood that the active sampling circuit 120 and the passive sampling circuit 110 connected to the same signal acquisition unit 300 can be randomly combined according to different scenarios. For example, a general op amp circuit and an RC circuit are connected to the same signal acquisition unit 300, a general op amp circuit and an LC circuit are connected to the same signal acquisition unit 300, a differential op amp circuit and an RC circuit are connected to the same signal acquisition unit 300, a differential op amp circuit and an LC circuit are connected to the same signal acquisition unit 300, a general op amp circuit, a differential op amp circuit and an LC circuit are connected to the same signal acquisition unit 300, a general op amp circuit, a differential op amp circuit and an LC circuit are connected to the same signal acquisition unit 300, a general op amp circuit, a differential op amp circuit and an RC circuit are connected to the same signal acquisition unit 300, or a general op amp circuit, a differential op amp circuit, an RC circuit and an LC circuit are all connected to the same signal acquisition unit 300. The sampling circuit connected to the same signal acquisition unit 300 can be selected according to actual conditions.

[0063] It can be understood that when configuring at least two sampling circuits connected to the same signal acquisition unit 300, a sampling circuit in which the sampling stability is less affected under different working conditions can be set. For example, for a strong electromagnetic compatibility environment, or a high temperature environment, a general operational amplifier circuit can be set as a sampling circuit. For a fast surge environment, an RC circuit can be set as a sampling circuit. For a low-frequency and high-energy environment, an LC circuit can be set as a sampling circuit. For a small current environment, a differential operational amplifier circuit can be set as a sampling circuit, etc. The setting of the sampling circuit here is only exemplary. When configuring a sampling circuit connected to the same signal acquisition unit 300, the corresponding sampling circuit can be selected according to the actual application scenario of the signal acquisition circuit.

[0064] In the above implementation process, by setting the active sampling circuit 120 to include: a general operational amplifier circuit and / or a differential operational amplifier circuit, wherein the general operational amplifier circuit is suitable for most application scenarios, and the differential operational amplifier circuit is suitable for small current application scenarios, the corresponding active sampling circuit 120 can be selected in different application scenarios to increase the sampling scenarios of the active sampling circuit 120. In addition, by setting the passive sampling circuit 110 to include: an RC circuit and / or an LC circuit, wherein the RC circuit is suitable for low-frequency oscillation scenarios, and the LC circuit is suitable for high-frequency oscillation scenarios, the corresponding passive sampling circuit 110 can be selected in different application scenarios to increase the sampling scenarios of the passive sampling circuit 110.

[0065] In one possible implementation, Figure 2 As shown, there are two sampling circuits, which are an RC circuit and a general operational amplifier circuit.

[0066] Among them, one end of the RC circuit is connected to the output end of the signal acquisition unit 300, and the other end of the RC circuit is connected to the signal receiving unit 200; one end of the general operational amplifier circuit is connected to the output end of the signal acquisition unit 300, and the other end of the general operational amplifier circuit is connected to the signal receiving unit 200.

[0067] The RC circuit and the general operational amplifier circuit here are configured to obtain the target signal collected by the same signal collection unit 300 .

[0068] In one embodiment, after the RC circuit and the general operational amplifier circuit collect the target signal, the target signal is processed and then sent to the signal receiving unit 200 .

[0069] The signal receiving unit 200 is a signal processing unit, which is used to process the acquired signal and determine the state of the monitored unit by processing the acquired signal. For example, the signal receiving unit 200 is a single chip microcomputer, a host computer, etc. The signal receiving unit 200 can be selected according to actual conditions.

[0070] It should be understood that when the signal acquisition circuit is actually working, there are some extreme working conditions. When in a strong electromagnetic compatibility environment and at high temperature, the RC circuit may have a risk of failure. At this time, the general-purpose op amp circuit can maintain normal acquisition function. When there is a fast surge in the signal acquisition circuit and the controller voltage fluctuates, the general-purpose op amp circuit has a risk of failure, and the RC circuit can maintain normal acquisition function.

[0071] In the above implementation process, by setting the same signal acquisition unit 300 to connect two sampling circuits, and the two sampling circuits are respectively an RC circuit and a general operational amplifier circuit, so that the same signal acquisition unit 300 is simultaneously connected to the active sampling circuit 120 and the passive sampling circuit 110, it is possible to collect the signal collected by the signal acquisition unit 300 under different working conditions, improve the stability of the signal acquisition circuit in signal acquisition under different working conditions, and increase the application scenarios of the signal acquisition circuit.

[0072] In a possible implementation, the RC circuit includes: a first capacitor C1 and a first resistor R1.

[0073] The first end of the first resistor R1 is connected to the output end of the signal acquisition unit 300 , the second end of the first resistor R1 is connected to the first end of the first capacitor C1 and the signal receiving unit 200 ; the second end of the first capacitor C1 is grounded.

[0074] In the above implementation process, by setting the sampling circuit to an RC circuit, when there is a fast surge in the signal acquisition circuit and the controller voltage fluctuates, the RC circuit can maintain the normal acquisition function, thereby increasing the stability of signal acquisition of the signal acquisition circuit under abnormal conditions such as voltage fluctuations.

[0075] In a possible implementation, the general operational amplifier circuit includes: a second capacitor C2, a second resistor R2, a third capacitor C3, a third resistor R3, and a first operational amplifier V1.

[0076] Among them, the first end of the second resistor R2 is connected to the output end of the signal acquisition unit 300, the second end of the second resistor R2 is connected to the first end of the second capacitor C2 and the first end of the first operational amplifier V1; the second end of the first operational amplifier V1 is connected to the third end of the first operational amplifier V1 and the first end of the third resistor R3; the second end of the third resistor R3 is connected to the first end of the third capacitor C3 and the signal receiving unit 200; the second end of the second capacitor C2 and the second end of the third capacitor C3 are grounded.

[0077] In the above implementation process, by setting the sampling circuit as a general operational amplifier circuit, when the signal acquisition circuit is in a strong electromagnetic compatibility environment and / or a high temperature environment, the general operational amplifier circuit can maintain normal acquisition function, thereby increasing the stability of signal acquisition of the signal acquisition circuit in abnormal environments.

[0078] In one possible implementation, Figure 3 As shown, the LC circuit includes: a first inductor L1 and a fourth capacitor C4.

[0079] The first end of the first inductor L1 is connected to the output end of the signal acquisition unit 300 , the second end of the first inductor L1 is connected to the first end of the fourth capacitor C4 and the signal receiving unit 200 ; the second end of the fourth capacitor C4 is grounded.

[0080] In the above implementation process, by setting the sampling circuit to an LC circuit, the LC circuit can maintain normal acquisition function in a low-frequency and high-energy interference scenario, thereby increasing the stability of the signal acquisition circuit in signal acquisition in a low-frequency and high-energy interference scenario.

[0081] In one possible implementation, Figure 3 As shown, the differential operational amplifier circuit includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and a second operational amplifier V2.

[0082] Among them, the first end of the fourth resistor R4 is connected to the output end of the signal acquisition unit 300, the second end of the fourth resistor R4 is connected to the first end of the fifth capacitor C5, the first end of the sixth resistor R6 and the first end of the second operational amplifier V2; the first end of the fifth resistor R5 is connected to the output end of the signal acquisition unit 300, the second end of the fifth resistor R5 is connected to the first end of the sixth capacitor C6 and the second end of the second operational amplifier V2; the second end of the second operational amplifier V2 is connected to the first end of the seventh resistor R7, the third end of the second operational amplifier V2 is connected to the second end of the seventh resistor R7 and the first end of the eighth resistor R8; the second end of the eighth resistor R8 is connected to the first end of the seventh capacitor C7 and the signal receiving unit 200; the second end of the sixth resistor R6, the second end of the fifth capacitor C5, the second end of the sixth capacitor C6 and the second end of the seventh capacitor C7 are grounded.

[0083] In the above implementation process, by setting the sampling circuit as a differential operational amplifier circuit, the LC circuit can maintain a normal acquisition function in a low current scenario, thereby increasing the stability of the signal acquisition circuit in signal acquisition in a low current scenario.

[0084] See also Figure 4 , is a structural diagram of a signal acquisition system provided in an embodiment of the present application, comprising: a signal acquisition unit 300 and the signal acquisition circuit in the above-mentioned embodiment.

[0085] The signal acquisition unit 300 is connected to one end of at least two sampling circuits. The multiple sampling circuits connected to the same signal acquisition unit 300 include an active sampling circuit 120 and a passive sampling circuit 110 .

[0086] The signal acquisition unit 300 here is used to collect signals from the monitored device. The signal acquisition unit 300 can be a pressure sensor, a temperature sensor, a vehicle speed sensor, a force sensor, a camera, etc. The monitored device can be an accelerator pedal, a brake, an engine, a battery system, etc. The signal acquisition unit 300 and the monitored device can be selected according to actual conditions.

[0087] It should be understood that, in order to improve the accuracy of monitoring, a plurality of signal acquisition units 300 may be provided on a monitored device, and the plurality of signal acquisition units 300 provided on the same monitored device are used to collect one or more signal information of the monitored device. Each signal acquisition unit 300 is connected to at least two sampling circuits, and the sampling circuits are configured to obtain the signal of the monitored device collected by the information acquisition unit.

[0088] Optionally, the multiple signal acquisition units 300 provided on the same monitored device may be signal acquisition units 300 of the same type, or may not be signal acquisition units 300 of the same type, or may partially be signal acquisition units 300 of the same type.

[0089] In one embodiment, the signal acquisition system further includes a ninth resistor R9 and an eighth capacitor C8, wherein a first end of the eighth capacitor C8 is connected to an output end of the signal acquisition unit 300 and a first end of the ninth resistor R9, and a second end of the eighth capacitor C8 and a second end of the ninth resistor R9 are grounded.

[0090] In the above implementation process, at least two sampling circuits are set for the same signal acquisition unit 300 to form redundant acquisition of multiple signals. When one sampling circuit is abnormal, the other sampling circuits can maintain normal acquisition functions, which can improve the stability of signal acquisition. In addition, by setting the sampling circuit connected to the same signal acquisition unit 300 to include an active sampling circuit 120 and a passive sampling circuit 110, since the active sampling circuit 120 and the passive sampling circuit 110 are sampling circuits with two different power supply modes, when the active sampling circuit is powered abnormally, the passive sampling circuit can maintain normal signal sampling, thereby improving the stability of the signal acquisition system in signal acquisition under different power supply states and increasing the application scenarios of the signal acquisition system.

[0091] In a possible implementation, each signal acquisition unit 300 is connected to one end of at least two sampling circuits.

[0092] Among them, the multiple signal acquisition units 300 are configured to obtain multiple target signals corresponding to the monitored device. For example, the monitored device is provided with a pressure sensor, a temperature sensor and a vehicle speed sensor. The pressure sensor is used to obtain the pressure signal of the monitored device, the temperature sensor is used to obtain the temperature signal of the monitored device, and the vehicle speed sensor is used to obtain the speed signal of the monitored device.

[0093] In one embodiment, the sampling circuit connected to each signal acquisition unit 300 includes an active sampling circuit 120 and a passive sampling circuit 110 .

[0094] In the above implementation process, each signal acquisition unit 300 is connected to at least two sampling circuits to form multi-channel signal redundant acquisition. When one sampling circuit is abnormal, other sampling circuits can maintain normal acquisition functions, thereby improving the stability of signal acquisition.

[0095] In a possible implementation, the signal acquisition system further includes: a signal receiving unit 200 .

[0096] The end of the sampling circuit away from the signal acquisition unit 300 is connected to the signal receiving unit 200 .

[0097] The signal receiving unit 200 here is a signal processing unit, which is used to process the acquired signal and determine the state of the monitored unit by processing the acquired signal. For example, the signal receiving unit 200 is a single chip microcomputer, a host computer, etc. The signal receiving unit 200 can be selected according to actual conditions.

[0098] In one embodiment, the signal receiving unit 200 includes a plurality of receiving modules, and each sampling circuit is connected to a receiving module. When a receiving module fails, another receiving module can maintain a normal acquisition function.

[0099] In another embodiment, there are multiple signal receiving units 200, and each sampling circuit is connected to one signal receiving unit 200. When one signal receiving unit 200 fails, another signal receiving unit 200 can maintain normal collection function.

[0100] In the above implementation process, by setting each sampling circuit to be connected to a receiving module or each sampling circuit to be connected to a signal receiving unit 200, when a receiving module or a signal receiving unit 200 fails, another receiving module or a signal receiving unit 200 can maintain a normal acquisition function. The stability of the signal receiving unit 200 receiving the signal is increased, thereby improving the stability of the entire signal acquisition system.

[0101] In one embodiment, the signal acquisition unit 300 is disposed on one or more devices in a braking system, an accelerator pedal, and a power system.

[0102] The braking system, accelerator pedal and power system here are equipment with higher safety requirements in the vehicle.

[0103] In one embodiment, the safety level of one or more devices in the braking system, the accelerator pedal, and the power system needs to reach ASIL-D level.

[0104] In the above implementation process, since the braking system, accelerator pedal and power system are devices with higher safety requirements, by setting the signal acquisition unit 300 on these devices with higher safety requirements, redundant acquisition of these devices with higher safety requirements is achieved, thereby improving the safety level of the braking system, accelerator pedal and power system equipment, thereby improving the safety of the entire vehicle.

[0105] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0106] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A signal acquisition circuit, characterized in that: include: at least two sampling circuits; One end of each of the acquisition circuits in at least two of the sampling circuits is connected to the same signal acquisition unit; Wherein, the at least two sampling circuits connected to the same signal acquisition unit include an active sampling circuit and a passive sampling circuit.

2. The signal acquisition circuit according to claim 1, characterized in that: The at least two sampling circuits connected to the same signal acquisition unit include: a sampling circuit that performs sampling by a signal processing method and a sampling circuit that performs sampling by a signal selection method.

3. The signal acquisition circuit according to claim 1, characterized in that: The active sampling circuit includes: a general operational amplifier circuit and / or a differential operational amplifier circuit; the passive sampling circuit includes: an RC circuit and / or an LC circuit.

4. The signal acquisition circuit according to claim 3, characterized in that: There are two sampling circuits, and the two sampling circuits are respectively an RC circuit and a general-purpose operational amplifier circuit; One end of the RC circuit is connected to the output end of the signal acquisition unit, and the other end of the RC circuit is connected to the signal receiving unit; One end of the universal operational amplifier circuit is connected to the output end of the signal acquisition unit, and the other end of the universal operational amplifier circuit is connected to the signal receiving unit; Wherein, the RC circuit and the general operational amplifier circuit are configured to acquire the signal collected by the same signal collection unit.

5. The signal acquisition circuit according to claim 4, characterized in that: The RC circuit includes: a first capacitor and a first resistor; A first end of the first resistor is connected to an output end of the signal acquisition unit, and a second end of the first resistor is connected to a first end of the first capacitor and the signal receiving unit; The second terminal of the first capacitor is grounded.

6. The signal acquisition circuit according to claim 4, characterized in that: The universal operational amplifier circuit comprises: a second capacitor, a second resistor, a third capacitor, a third resistor and a first operational amplifier; A first end of the second resistor is connected to the output end of the signal acquisition unit, and a second end of the second resistor is connected to a first end of the second capacitor and a first end of the first operational amplifier; The second end of the first operational amplifier is connected to the third end of the first operational amplifier and the first end of the third resistor; The second end of the third resistor is connected to the first end of the third capacitor and the signal receiving unit; The second end of the second capacitor and the second end of the third capacitor are grounded.

7. The signal acquisition circuit according to claim 3, characterized in that: The LC circuit comprises: a first inductor and a fourth capacitor; The first end of the first inductor is connected to the output end of the signal acquisition unit, and the second end of the first inductor is connected to the first end of the fourth capacitor and the signal receiving unit; A second terminal of the fourth capacitor is grounded.

8. The signal acquisition circuit according to claim 3, characterized in that: The differential operational amplifier circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor and a second operational amplifier; The first end of the fourth resistor is connected to the output end of the signal acquisition unit, and the second end of the fourth resistor is connected to the first end of the fifth capacitor, the first end of the sixth resistor and the first end of the second operational amplifier; A first end of the fifth resistor is connected to the output end of the signal acquisition unit, and a second end of the fifth resistor is connected to a first end of the sixth capacitor and a second end of the second operational amplifier; The second end of the second operational amplifier is connected to the first end of the seventh resistor, and the third end of the second operational amplifier is connected to the second end of the seventh resistor and the first end of the eighth resistor; The second end of the eighth resistor is connected to the first end of the seventh capacitor and the signal receiving unit; The second end of the sixth resistor, the second end of the fifth capacitor, the second end of the sixth capacitor, and the second end of the seventh capacitor are grounded.

9. A signal acquisition system, characterized in that: include: A signal acquisition unit and a signal acquisition circuit according to any one of claims 1 to 8; The signal acquisition unit is connected to one end of at least two of the sampling circuits; Among them, the multiple sampling circuits connected to the same signal acquisition unit include active sampling circuits and passive sampling circuits.

10. The signal acquisition system according to claim 9, characterized in that: Each monitored device is equipped with a plurality of signal acquisition units; Each of the signal acquisition units is connected to one end of at least two of the sampling circuits; The plurality of signal acquisition units are configured to acquire a plurality of target signals corresponding to the monitored device, and the sampling circuit connected to each of the signal acquisition units includes the active sampling circuit and the passive sampling circuit.

11. The signal acquisition system according to claim 9, characterized in that: Also includes: A signal receiving unit; One end of the sampling circuit away from the signal acquisition unit is connected to the signal receiving unit; The signal receiving unit includes a plurality of receiving modules, and each sampling circuit is connected to one of the receiving modules; or, There are multiple signal receiving units, and each sampling circuit is connected to one signal receiving unit.

12. The signal acquisition system according to claim 9, characterized in that: The signal acquisition unit is arranged on one or more devices in the braking system, the accelerator pedal and the power system.

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