Rotating speed monitoring circuit and device with amplitude sampling function

Abstract

The utility model provides a rotating speed monitoring circuit and device with an amplitude sampling function, the rotating speed monitoring circuit comprises a rotating speed amplitude sampling circuit and a rotating speed counting sampling circuit, the input end of the rotating speed amplitude sampling circuit is used for connecting a rotating speed signal input end; the output end of the rotating speed amplitude sampling circuit is used for outputting a rotating speed amplitude monitoring signal; the input end of the rotating speed counting sampling circuit is used for being connected with a rotating speed signal input end, and the output end of the rotating speed counting sampling circuit is used for outputting a rotating speed counting monitoring signal. The rotating speed monitoring device with the amplitude sampling function comprises the rotating speed monitoring circuit with the amplitude sampling function, and further comprises a rotating speed sensor and a controller. Therefore, the rotating speed counting and sampling circuit not only has a rotating speed counting and sampling function, but also has a rotating speed amplitude sampling circuit, thereby providing a reference basis for effectively filtering interference signals.

Description

Technical Field

[0001] The utility model relates to the technical field of engine control, in particular to a rotation speed monitoring circuit and a device with an amplitude sampling function. Background Art

[0002] Engine speed is crucial to engine control. However, in actual applications, due to the existence of various interferences, the accuracy of speed sampling is difficult to meet the accuracy requirements, which can easily cause inaccuracy in engine status monitoring. Therefore, accurate and reliable speed sampling is required, which can better understand the operating status of the engine and make timely judgments when the speed is abnormal to avoid accidents.

[0003] For example, the Chinese patent application number CN201420289434.3 discloses an engine speed sampling and control circuit, which includes a first counter, a second counter, a register, a combinational logic circuit and a controller, which can not only calculate the engine speed, but also directly determine whether the speed is within a normal range, that is, whether it is between the maximum speed and the minimum speed;

[0004] The Chinese patent application number is CN202322299760.4, which discloses a device for collecting engine speed signals. The device is connected to the engine speed signal through a variable resistor circuit to collect the speed signal. The speed signal passes through the variable resistor circuit to achieve different voltage divisions at low speed and high speed, making the collected speed signal more accurate.

[0005] It should be noted that the engine may be disturbed during operation, resulting in abnormal speed signal amplitude, but the existing speed sampling circuit usually only counts the speed signal and cannot sample the speed amplitude.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0007] The utility model aims to provide a speed monitoring circuit and device with amplitude sampling function in view of the deficiencies of the prior art.

[0008] In order to achieve the above-mentioned object, the utility model provides a speed monitoring circuit with an amplitude sampling function in a first aspect, which includes a speed amplitude sampling circuit and a speed counting sampling circuit, wherein the input end of the speed amplitude sampling circuit is used to connect to the speed signal input end, and the output end of the speed amplitude sampling circuit is used to output the speed amplitude monitoring signal; the input end of the speed counting sampling circuit is used to connect to the speed signal input end, and the output end of the speed counting sampling circuit is used to output the speed counting monitoring signal;

[0009] Wherein, the speed amplitude sampling circuit includes an operational amplifier, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a magnetic bead L1, the in-phase end of the operational amplifier is connected to the speed signal input end through the resistor R2, the inverting end of the operational amplifier is connected to the ground end through the resistor R5, and the resistor R4 is connected between the resistor R2 and the resistor R5; the resistor R1 and the capacitor C1 are connected in parallel between the in-phase end and the negative power supply pin of the operational amplifier, and the resistor R6 and the capacitor C4 are connected in parallel between the inverting end and the output end of the operational amplifier;

[0010] The output end of the operational amplifier is also connected to one end of the resistor R3 through the magnetic bead L1, and the other end of the resistor R3 serves as the output end of the speed amplitude sampling circuit; one end of the resistor R3 is also grounded through the capacitor C2, and the other end of the resistor R3 is also grounded through the capacitor C3.

[0011] In order to achieve the above-mentioned purpose, the second aspect of the utility model provides a speed monitoring device with an amplitude sampling function, which includes the above-mentioned speed monitoring circuit with amplitude sampling function, and also includes a speed sensor and a controller; the speed sensor is respectively connected to the input ends of the speed amplitude sampling circuit and the speed counting sampling circuit, and the output ends of the speed amplitude sampling circuit and the speed counting sampling circuit are respectively connected to the controller to transmit the sampled speed amplitude monitoring signal and the speed counting monitoring signal to the controller.

[0012] The beneficial effects of the utility model are:

[0013] 1) The utility model proposes a speed monitoring circuit with amplitude sampling function, which includes a speed amplitude sampling circuit and a speed counting sampling circuit, etc. It not only has a speed counting sampling function, but also has a speed amplitude sampling circuit, which provides a reference basis for effectively filtering interference signals;

[0014] 2) The utility model also proposes a speed monitoring device with an amplitude sampling function, which includes a speed sensor, a controller and the above-mentioned speed monitoring circuit with amplitude sampling function. By monitoring the amplitude of the speed signal, it can help to effectively filter interference signals and help to achieve accurate detection of the speed signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a speed monitoring circuit with amplitude sampling function of the utility model;

[0016] Figure 2It is a circuit principle diagram of a speed monitoring circuit with amplitude sampling function of the utility model;

[0017] Figure 3 It is a structural schematic diagram of a rotation speed monitoring device with amplitude sampling function of the utility model. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0019] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances. This is just a way of distinguishing objects with the same attributes when describing the embodiments of this application.

[0020] Example 1

[0021] As attached Figure 1 and attached Figure 2 As shown, this embodiment provides a specific implementation of a speed monitoring circuit with amplitude sampling function;

[0022] It comprises a speed amplitude sampling circuit and a speed counting sampling circuit, wherein the input end of the speed amplitude sampling circuit is used to connect to the speed signal input end, and the output end of the speed amplitude sampling circuit is used to output the speed amplitude monitoring signal; the input end of the speed counting sampling circuit is used to connect to the speed signal input end, and the output end of the speed counting sampling circuit is used to output the speed counting monitoring signal;

[0023] Wherein, the speed amplitude sampling circuit includes an operational amplifier, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a magnetic bead L1, the in-phase end of the operational amplifier is connected to the speed signal input end through the resistor R2, the inverting end of the operational amplifier is connected to the ground end through the resistor R5, and the resistor R4 is connected between the resistor R2 and the resistor R5; the resistor R1 and the capacitor C1 are connected in parallel between the in-phase end and the negative power supply pin of the operational amplifier, and the resistor R6 and the capacitor C4 are connected in parallel between the inverting end and the output end of the operational amplifier;

[0024] The output end of the operational amplifier is also connected to one end of the resistor R3 through the magnetic bead L1, and the other end of the resistor R3 serves as the output end of the speed amplitude sampling circuit; one end of the resistor R3 is also grounded through the capacitor C2, and the other end of the resistor R3 is also grounded through the capacitor C3.

[0025] It should be noted that this embodiment is an improvement on the existing sampling circuit. Combining the deficiencies of the previous circuit, a new speed monitoring circuit is designed to meet the application requirements. The speed monitoring circuit includes a speed amplitude sampling circuit and a speed counting sampling circuit, etc. It not only has a speed counting sampling function, but also has a speed amplitude sampling circuit, which provides a reference for effectively filtering interference signals.

[0026] It should also be noted that the resistor R1 and the resistor R2 are used as voltage-dividing resistors to reduce the input voltage of the in-phase terminal of the operational amplifier; the resistor R4 is used as a pull-down resistor, and the resistor R6 is used as a feedback resistor; the magnetic bead L1 is used as a signal filtering magnetic bead, the resistor R3 is used as a current-limiting resistor, and the capacitor C3 and the capacitor C3 are used as filter capacitors.

[0027] In a specific implementation, one end of the resistor R2 is connected to one end of the resistor R4, and this connection point is connected to the speed signal input terminal (IN) as the input terminal of the speed amplitude sampling circuit; the other end of the resistor R3 is used as the output terminal (OUT1) of the speed amplitude sampling circuit, which is used to output the speed amplitude monitoring signal;

[0028] The model of the operational amplifier U1 is RS321BKXF; the resistance values ​​of the resistors R1 and R6 are 3.3K ohms, the resistance values ​​of the resistors R2, R4 and R5 are 62K ohms, and the resistance value of the resistor R3 is 100K ohms; the parameters of the capacitors C1 and C4 are 100nF / 50V, the parameter of the capacitor C2 is 10nF / 50V, and the parameter of the capacitor C3 is 1μF / 50V.

[0029] In some embodiments, as shown in the attached Figure 2 As shown, the speed counting sampling circuit includes a TVS tube D1, a low-pass filter and a transistor switch circuit. The TVS tube D1 is connected between the input end and the ground end of the speed counting sampling circuit, the low-pass filter is connected between the input end of the speed counting sampling circuit and the control end of the transistor switch circuit, and the output end of the transistor switch circuit serves as the output end of the speed counting sampling circuit.

[0030] It should be noted that the function of TVS tube D1 is to suppress surge interference, resistors R8, R9, and R10 are used as voltage-dividing resistors, capacitor C6 and resistor R9 form a low-pass filter, the function of diode D2 is to protect transistor Q1, the function of transistor Q1 is level conversion and amplitude control, R7 is a pull-up resistor, and C5 is a filter capacitor.

[0031] It should also be noted that when the speed sensor input signal received by the input end of the speed counting sampling circuit is at a high level, the transistor Q1 is turned on, and the speed counting monitoring signal changes from a high level to a low level. At this time, it is counted once, and so on, and the speed signal frequency is recorded.

[0032] In a specific implementation, one end of the resistor R8 is connected to one end of the TVS tube D1, and the connection point is used as the input end of the speed counting sampling circuit, and is connected to the speed signal input end (IN); the collector of the transistor Q1 is used as the output end (OUT2) of the speed counting sampling circuit, and is used to output the speed counting monitoring signal;

[0033] The resistance values ​​of resistors R8 and R9 are 2K ohms, the resistance value of resistor R10 is 4.7K ohms, the resistance value of resistor R7 is 10K ohms, the parameters of capacitor C6 are 4.7nF / 50V, and the parameters of capacitor C5 are 150pF / 50V; the model of TVS tube D1 is SMBJ70CA, the model of diode D2 is S1M, and the model of transistor Q1 is 8050 (Y1).

[0034] Example 2

[0035] Based on Example 1, this embodiment provides a speed monitoring device with amplitude sampling function, as shown in the attached Figure 3 As shown;

[0036] The speed monitoring device with amplitude sampling function includes the speed monitoring circuit with amplitude sampling function in Example 1, and also includes a speed sensor and a controller; the speed sensor is connected to the input ends of the speed amplitude sampling circuit and the speed counting sampling circuit, respectively, and the output ends of the speed amplitude sampling circuit and the speed counting sampling circuit are connected to the controller, respectively, so as to transmit the sampled speed amplitude monitoring signal and the speed counting monitoring signal to the controller.

[0037] It should be noted that the speed sensor is connected to the signal input terminal (IN) of the speed monitoring circuit, and the controller is respectively connected to the first signal output terminal OUT1 and the second signal output terminal OUT2 of the speed monitoring circuit;

[0038] The input signal of the speed sensor enters the controller through the speed amplitude sampling circuit and the speed counting sampling circuit respectively, providing a reference basis for effectively filtering interference signals;

[0039] One of the speed sensor input signals enters the controller through the speed amplitude sampling circuit to monitor the speed amplitude; the specific process is: the speed sensor input signal is divided by resistors R2 and R1 and enters the non-inverting end of the operational amplifier U1; the output signal of the operational amplifier U1 passes through the filter circuit composed of magnetic beads L1, capacitor C2, resistor R3, and capacitor C3 and enters the corresponding single-chip microcomputer ADC port for amplitude sampling;

[0040] Another speed sensor input signal enters the controller through the speed counting sampling circuit to monitor and record the speed signal frequency; the specific process is: the speed sensor input signal is divided by resistors R8, R9 and R10. When the signal is high, transistor Q1 is turned on, and the speed counting signal changes from high level to low level. At this time, it counts once, and so on. The controller records the speed signal frequency.

[0041] In other embodiments, when the controller detects a sudden change in the speed signal amplitude through the speed amplitude monitoring signal, it considers that the speed signal is abnormal. At this time, the speed count value does not increase. Then, by monitoring the amplitude of the speed signal, it helps to filter out interference signals, which is conducive to accurate detection of the speed signal.

[0042] In some embodiments, the model of the speed sensor may be Cummins QSX15, and the installation position and function are prior art and will not be described in detail here; the controller may be an STM32 series single-chip microcomputer.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A speed monitoring circuit with amplitude sampling function, characterized in that: It comprises a speed amplitude sampling circuit and a speed counting sampling circuit, wherein the input end of the speed amplitude sampling circuit is used to connect to the speed signal input end, and the output end of the speed amplitude sampling circuit is used to output the speed amplitude monitoring signal; the input end of the speed counting sampling circuit is used to connect to the speed signal input end, and the output end of the speed counting sampling circuit is used to output the speed counting monitoring signal; Wherein, the speed amplitude sampling circuit includes an operational amplifier, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a magnetic bead L1, the in-phase end of the operational amplifier is connected to the speed signal input end through the resistor R2, the inverting end of the operational amplifier is connected to the ground end through the resistor R5, and the resistor R4 is connected between the resistor R2 and the resistor R5; the resistor R1 and the capacitor C1 are connected in parallel between the in-phase end and the negative power supply pin of the operational amplifier, and the resistor R6 and the capacitor C4 are connected in parallel between the inverting end and the output end of the operational amplifier; The output end of the operational amplifier is also connected to one end of the resistor R3 through the magnetic bead L1, and the other end of the resistor R3 serves as the output end of the speed amplitude sampling circuit; one end of the resistor R3 is also grounded through the capacitor C2, and the other end of the resistor R3 is also grounded through the capacitor C3.

2. The speed monitoring circuit with amplitude sampling function according to claim 1 is characterized in that: The speed counting sampling circuit includes a TVS tube D1, a low-pass filter and a transistor switch circuit. The TVS tube D1 is connected between the input end and the ground end of the speed counting sampling circuit, the low-pass filter is connected between the input end of the speed counting sampling circuit and the control end of the transistor switch circuit, and the output end of the transistor switch circuit serves as the output end of the speed counting sampling circuit.

3. A speed monitoring device with amplitude sampling function, characterized in that: The speed monitoring circuit with amplitude sampling function comprises the speed monitoring circuit with amplitude sampling function as claimed in claim 1 or 2, and also comprises a speed sensor and a controller; The speed sensor is connected to the input ends of the speed amplitude sampling circuit and the speed count sampling circuit respectively, and the output ends of the speed amplitude sampling circuit and the speed count sampling circuit are connected to the controller respectively to transmit the sampled speed amplitude monitoring signal and the speed count monitoring signal to the controller.

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