A polystate controller for agricultural machinery or engineering machinery equipment

Abstract

The invention discloses a multi-state controller for agricultural machinery or engineering machinery equipment, comprising a central processing unit, an analog signal input module, a digital signal input module, a pulse signal input module, a high-side and low-side drive signal output module and a PWM signal output module connected to the central processing unit, the analog signal input module is used to receive an analog signal, the analog signal is configured as a voltage input or a current input, the digital signal input module includes a push-pull high-low effective control circuit, the invention is compatible with the transmission of analog signals, digital signals and high-voltage pulse signals, and can output control signals that meet the manufacturer's design.

Description

Technical Field

[0001] The present invention relates to the field of controllers, and in particular to a polymorphic controller for agricultural machinery or engineering machinery equipment. Background Art

[0002] At present, a large number of sensors are integrated into agricultural machinery or engineering machinery equipment, which play an important role in improving equipment performance and realizing automation and intelligence.

[0003] Different types of sensors are used to collect and process various types of sensor signals. Specifically, digital signal sensors such as photoelectric sensors directly output digital signals; analog signal sensors such as water temperature sensors and oil temperature sensors collect signals under the drive of a separate DC voltage and output analog signals; pulse signal sensors such as Hall sensors work under the drive of the vehicle power supply and output high-voltage pulse signals.

[0004] The inventor of this patent has at least discovered the following technical problems in the prior art: Since analog signal input sensors are divided into two types: voltage input or current input, and digital signal input sensors are divided into two types: high-level valid and low-level valid, they cannot be directly analyzed and processed by the controller of agricultural machinery or engineering machinery equipment.

[0005] In summary, the controllers of existing agricultural machinery or engineering machinery equipment are unable to analyze and process different types of sensor signals. Summary of the invention

[0006] The embodiment of the present invention provides a multi-state controller for agricultural machinery or engineering machinery equipment, which solves the problem that the controller of the existing agricultural machinery or engineering machinery equipment cannot analyze and process different types of sensor signals.

[0007] An embodiment of the present invention provides a multi-state controller for agricultural machinery or engineering machinery equipment, including: CPU; An analog signal input module, used to receive an analog signal, the analog signal is configured as a voltage input or a current input, its input end is connected to the multi-channel analog signal output by the device, and its output end is connected to the analog signal input end of the central processor; A digital signal input module, used for receiving digital signals, whose input end is connected to the multi-channel digital signals output by the device, and whose output end is connected to the digital signal input end of the central processor; the digital signal input module includes a push-pull high and low effective control circuit; A pulse signal input module, used for receiving pulse signals, whose input end is connected to the multi-channel pulse signals output by the device, and whose output end is connected to the pulse signal input end of the central processor; A high-side and low-side drive signal output module, whose input end is connected to the high-side and low-side drive signal output port of the central processing unit, and whose output end is connected to an external device driven by the high-side and low-side drive signals; The PWM signal output module has an input end connected to the PWM signal output port of the central processing unit, and an output end connected to an external device driven by the PWM signal.

[0008] Optionally, the analog signal input module includes a pull-down circuit control circuit and a pull-up circuit control circuit.

[0009] Optionally, the high-side and low-side drive signal output modules include a hardware overcurrent protection circuit.

[0010] Optionally, the high-side and low-side drive signal output modules have an I / O output mode and a PWM output mode.

[0011] Optionally, the PWM signal output module includes a PWM current feedback circuit.

[0012] Optionally, the multi-state controller further includes: The 5V output module has an input end connected to the 5V output port of the central processing unit, and an output end connected to a sensor powered by a 5V voltage.

[0013] Optionally, the multi-state controller further includes: The encoder input module has an input end connected to the multi-channel pulse signal output by the device, and an output end connected to the encoder input end of the central processor.

[0014] Optionally, the multi-state controller further includes: A power module, an input end of which is connected to the vehicle power supply, and an output end of which is connected to the power input end of the central processing unit.

[0015] Optionally, the multi-state controller further includes: The CAN communication module is connected to the central processing unit.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: The multi-state controller for agricultural machinery or engineering machinery equipment of the present invention, its analog signal input module, digital signal input module and pulse signal input module can be used to receive analog signals, digital signals and pulse signals respectively, and can be compatible with the transmission of analog signals, digital signals and high-voltage pulse signals; the analog signal can be configured as voltage input or current input, and can be compatible with different analog input sensors on the market; the push-pull high and low effective control circuit in the digital signal input module can be compatible with different types of sensors, including NPN sensors and PNP sensors; the pulse signal input module directly receives pulse signals; the high and low side drive signal output module and the PWM signal output module can be configured with high and low side drive and PWM signal output, respectively used for ordinary switch solenoid valves and proportional solenoid valves, and can output control signals that meet the manufacturer's design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a polymorphic controller for agricultural machinery or engineering machinery equipment in one embodiment of the present invention; Figure 2 is a circuit diagram of a pull-down circuit control circuit in one embodiment of the present invention; Figure 3 is a circuit diagram of a pull-up circuit control circuit in one embodiment of the present invention; Figure 4 A circuit diagram of a push-pull high-low effective control circuit in one embodiment of the present invention; Figure 5 is a circuit diagram of a hardware overcurrent protection circuit in one embodiment of the present invention; Figure 6 is a circuit diagram of a PWM current feedback circuit in one embodiment of the present invention; In the figure: R1-first resistor; Q1B-first MOS tube; R2-second resistor; R3-the third resistor; R4-the fourth resistor; R5-fifth resistor; R6 - the sixth resistor; R7-seventh resistor; R8 - the eighth resistor; R9-ninth resistor; C1-first capacitor; Q1-the first transistor; Q2-the second transistor; VD1-unidirectional TVS; R10-the tenth resistor; R11-eleventh resistor; R12-twelfth resistor; R13-thirteenth resistor; R14 - fourteenth resistor; Q3-the third transistor; Q4-the fourth transistor; Q5-fifth transistor; R15 - variable resistor; R16 - sixteenth resistor; R17 - seventeenth resistor; R18 - eighteenth resistor; R19 - nineteenth resistor; C2-second capacitor; D1-first diode; D2-second diode; U1B - Operational Amplifier; Q6-sixth transistor; F1-Fuse Q2B-second MOS tube; R20-twentieth resistor; R21-twenty-first resistor; R22-22nd resistor; R23-23rd resistor; R24-24th resistor; R25-25th resistor; R26-26th resistor; R27-27th resistor; R28-28th resistor; R29-29th resistor; R30-30th resistor; R31-the thirty-first resistor; Q7-the seventh transistor; Q8-eighth transistor; U2B - Second operational amplifier; C3-third capacitor; C4-fourth capacitor; C5 - fifth capacitor. DETAILED DESCRIPTION

[0018] The embodiment of the present invention provides a multi-state controller for agricultural machinery or engineering machinery equipment, which solves the problem that the controller of the existing agricultural machinery or engineering machinery equipment cannot analyze and process different types of sensor signals.

[0019] In order to better understand the above-mentioned polymorphic controller for agricultural machinery or engineering machinery equipment, a detailed description will be given below in conjunction with the drawings and specific implementation methods of the specification. Obviously, the embodiments described in the present invention are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] An embodiment of the present invention provides a multi-state controller for agricultural machinery or engineering machinery equipment, including: a central processing unit, an analog signal input module, a digital signal input module, a pulse signal input module, a high-side and low-side drive signal output module, and a PWM signal output module.

[0021] The analog signal input module is used to receive analog signals. The analog signals are configured as voltage input or current input. Its input end is connected to the multi-channel analog signals output by the device, and its output end is connected to the analog signal input end of the central processing unit.

[0022] The analog signal input module is used to obtain analog values. It can be configured as 0V-5V voltage input, 0mA-20mA and 4mA-20mA current input, and is compatible with different analog input sensors on the market. For example, pressure sensors are generally 4mA-20mA, and oil level sensors are 4mA-20mA and 0V-5V. The analog signal input module includes a pull-down circuit control circuit and a pull-up circuit control circuit, which can be configured as a pull-down state, a pull-up state, and no pull-up or pull-down state, and is compatible with most analog input sensors on the market. If the multi-state controller needs to obtain temperature, pressure and other data, it can be connected to the analog signal input module and configured as no pull-up or pull-down state to read the corresponding analog data; if you need to obtain analog data such as humidity and light, you can set the analog signal input module to a pull-up state to reduce signal interference; if you need to obtain analog data such as distance and gas, you can set the analog signal input module to a pull-down state to reduce signal noise.

[0023] like Figure 2 As shown, the pull-down circuit control circuit includes: a first resistor R1, a second resistor R2, a third resistor R3 and a first MOS transistor Q1B. The first end of the first resistor R1 is connected to the analog input signal AD_IN1, the second end of the first resistor R1 is connected to the drain of the first MOS transistor Q1B, the source analog circuit of the first MOS transistor Q1B is grounded, the gate of the first MOS transistor Q1B is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded through the analog signal of the third resistor R3, and the analog input control signal AD_IN1_PD_CTRL is grounded through the analog signal of the third resistor R3.

[0024] like Figure 3As shown, the pull-up circuit control circuit includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first capacitor C1, a unidirectional TVSVD1, a first transistor Q1 and a second transistor Q2. A first end of the fourth resistor R4 is connected to the analog input signal AD_IN1, a second end of the fourth resistor R4 is connected to the analog signal ground through the first capacitor C1, a power supply VBAT is connected to the emitter of the first transistor Q1, a collector of the first transistor Q1 is connected to the first end of the fifth resistor R5, a second end of the fifth resistor R5 is connected to the second end of the fourth resistor R4 and the first end of the unidirectional TVSVD1, an analog signal of the second end of the unidirectional TVSVD1 is grounded, a power supply VBAT is connected to the first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected to the base of the first transistor Q1 and the first end of the seventh resistor R7, a second end of the seventh resistor R7 is connected to the collector of the second transistor Q2, an analog signal of the emitter of the second transistor Q2 is grounded, an analog input control signal AD_IN1_PD_CTRL is connected to the first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to the base of the second transistor Q2 and the first end of the ninth resistor R9, and an analog signal of the second end of the ninth resistor R9 is grounded.

[0025] The digital signal input module is used to receive digital signals. Its input end is connected to the multiple digital signals output by the device, and its output end is connected to the digital signal input end of the central processing unit. The digital signal input module is used to obtain the input status and supports 24V switch input. The digital signal input module includes a push-pull high-low effective control circuit and can be configured to be high-level / low-level effective. If a digital input signal is high-level effective, it can be configured to be high-level effective through software to connect to the digital signal input module, and the desired signal can be obtained and transmitted to the central processing unit; if a digital input signal is low-level effective, it can be configured to be low-level effective through software to connect to the digital input module, and the desired signal can also be obtained and transmitted to the central processing unit.

[0026] like Figure 4As shown, the push-pull high-low effective control circuit includes a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14. The power supply VBAT is connected to the collector of the third transistor Q3, the emitter of the third transistor Q3 is connected to the emitter of the fourth transistor Q4, the collector of the fourth transistor Q4 is grounded, the first end of the eleventh resistor R11 is connected to the power supply VBAT, the second end of the eleventh resistor R11 is connected to the base of the third transistor Q3 and the base of the fourth transistor Q4, the digital input signal SW_IO_1 is connected to the first end of the tenth resistor R10, the second end of the tenth resistor R10 is connected to the emitter of the third transistor Q3 and the emitter of the fourth transistor Q4, the +5V power supply is connected to the first end of the fourteenth resistor R14, and the second end of the fourteenth resistor R14 is connected to the digital input control signal SW_BK 1_PD is connected to the first end of the thirteenth resistor R13, the second end of the thirteenth resistor R13 is connected to the first end of the twelfth resistor R12 and the base of the fifth triode Q5, the collector of the fifth triode Q5 is connected to the second end of the eleventh resistor R11, the base of the third triode Q3 and the base of the fourth triode Q4, the emitter of the fifth triode Q5 is grounded, and the second end of the twelfth resistor R12 is grounded.

[0027] The pulse signal input module is used to receive pulse signals. Its input end is connected to the multi-channel pulse signals output by the device, and its output end is connected to the pulse signal input end of the central processor. The pulse input module can obtain the frequency and duty cycle of the pulse signal.

[0028] The high and low side drive signal output module has its input end connected to the high and low side drive signal output port of the central processing unit, and its output end connected to the external device driven by the high and low side drive signal. The high and low side drive signal output module is used to obtain output state feedback and output current.

[0029] The high-side and low-side drive signal output modules have I / O output mode and PWM output mode. If the multi-state controller needs to drive a solenoid valve, switch, etc., the high-side and low-side drive signal output modules can be configured as I / O output mode, and the digital quantity can be output at this time; if the multi-state controller needs to drive a motor speed, LED brightness, fan speed, etc., the high-side and low-side drive signal output modules can be configured as PWM output mode, and the above-mentioned actuators can be controlled at this time. The high-side and low-side drive signal output modules include hardware overcurrent protection circuits.

[0030] like Figure 5As shown, the hardware overcurrent protection circuit includes a variable resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a second capacitor C2, an operational amplifier U1B, a first diode D1, a second diode D2 and a sixth transistor Q6. The hardware overcurrent protection reset signal HSO_OCRST_1 is connected to the first end of the nineteenth resistor R19, the second end of the nineteenth resistor R19 is connected to the base of the sixth transistor Q6, the emitter of the sixth transistor Q6 is grounded, the collector of the sixth transistor Q6 is connected to the first end of the eighteenth resistor R18, the second end of the eighteenth resistor R18 is connected to the non-inverting input terminal of the operational amplifier U1B, the current feedback signal HSO_IS_1 is connected to the first end of the first diode D1, the second end of D1 is connected to the non-inverting input terminal of the operational amplifier U1B, and the overcurrent protection signal HS O_OC_1 is connected to the output end of the operational amplifier U1B and the first end of the second diode D2, the second end of the second diode D2 is connected to the non-inverting input end of the operational amplifier U1B, the +5V power supply is connected to the first end of the sixteenth resistor R16, the second end of the sixteenth resistor R16 is connected to the first end of the variable resistor R15, the first end of the second capacitor C2, the first end of the seventeenth resistor R17 and the reverse input end of the operational amplifier U1B, the second end of the variable resistor R15 is grounded, the second end of the second capacitor C2 is grounded, and the second end of the seventeenth resistor R17 is grounded.

[0031] In the hardware overcurrent protection circuit of the present invention, the overcurrent threshold is generated by resistor voltage division, and a variable resistor (potentiometer) is reserved for easy adjustment. After the value is determined, it is changed to resistor voltage division. The current feedback signal HSO_IS_1 is compared with the threshold. When the current feedback signal HSO_IS_1 exceeds the threshold, the overcurrent protection signal HSO_OC_1 is enabled. The first diode D1 and the second diode D2 implement the locking of the overcurrent protection signal HSO_OC_1, that is, to prevent the overcurrent situation from disappearing after the protection takes effect, and the switch is turned on again, and so on. Through the hardware overcurrent protection circuit of the present invention, the hardware can realize that the overcurrent protection signal can be maintained after the overcurrent phenomenon fails, avoiding repeated switching phenomena, and no software participation is required. The overcurrent protection of the existing Carraro TCU requires software participation, otherwise there will be repeated switching phenomena. The mutual exclusion of channels (data transmission and control paths inside the TCU), generally the TCU is controlled by a logic chip, and the hardware overcurrent protection circuit of the present invention is realized by diodes and transistors.

[0032] The PWM signal output module has an input end connected to the PWM signal output port of the central processing unit, and an output end connected to an external device driven by the PWM signal. The PWM signal output module includes a PWM current feedback circuit.

[0033] like Figure 6As shown, the PWM current feedback circuit includes a fuse F1, a second MOS tube Q2B, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, a seventh transistor Q7, an eighth transistor Q8, a second operational amplifier U2B, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. The PWM input signal PWMFB_1 is connected to the first end of the fuse F1, the second end of the fuse F1 is connected to the drain of the second MOS tube Q2B, the source of the second MOS tube Q2B is connected to the first end of the twenty-seventh resistor R27, the second end of the twenty-seventh resistor R27 is connected to the non-inverting input end of the second operational amplifier U2B, the first end of the twenty-sixth resistor R26 is connected to the source of the second MOS tube Q2B and the first end of the twenty-seventh resistor R27, the second end of the twenty-sixth resistor R26 is grounded, the first end of the twenty-eighth resistor R28 is connected to the second end of the twenty-sixth resistor R26, and the second end of the twenty-eighth resistor R28 is connected to the second end of the twenty-sixth resistor R28. The second end of the twenty-eighth resistor R28 is connected to the inverting input end of the second operational amplifier U2B, the PWM current signal I_PWMFB1 is connected to the first end of the thirty-first resistor R31, the first end of the fourth capacitor C4 and the first end of the thirtieth resistor R30, the second end of the thirty-first resistor R31 is grounded, the second end of the fourth capacitor C4 is grounded, the second end of the thirtieth resistor R30 is connected to the output end of the second operational amplifier U2B, the first end of the third capacitor C3 and the first end of the twenty-ninth resistor R29, the second end of the third capacitor C3 and the second end of the twenty-ninth resistor R29 are both connected to the second The second end of the eighteenth resistor R28 is connected to the inverting input end of the second operational amplifier U2B, the +5V power supply is connected to the positive power supply end of the second operational amplifier U2B and the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, the negative power supply end of the second operational amplifier U2B is grounded, the power supply VBAT is connected to the first end of the twentieth resistor R20, the second end of the twentieth resistor R20 is connected to the emitter of the seventh transistor Q7, the collector of the seventh transistor Q7 is connected to the gate of the second MOS tube Q2B and the first end of the twenty-third resistor R23, the second end of the twenty-third resistor R23 is connected The power supply VBAT is connected to the first end of the twenty-first resistor R21, the second end of the twenty-first resistor R21 is connected to the base of the seventh transistor Q7 and the first end of the twenty-second resistor R22, the second end of the twenty-second resistor R22 is connected to the collector of the eighth transistor Q8, the emitter of the eighth transistor Q8 is grounded, the PWM switch control signal PWMFB_CTRL_1 is connected to the first end of the twenty-fourth resistor R24, the second end of the twenty-fourth resistor R24 ​​is connected to the base of the eighth transistor Q8 and the first end of the twenty-fifth resistor R25, and the second end of the twenty-fifth resistor R25 is grounded.

[0034] The driving circuit of the MOS tube is generally controlled by a gate circuit as a buffer to avoid direct drive by the MCU. In the PWM current feedback circuit of the present invention, a triode circuit is used to increase the driving voltage of the MOS tube, so that the MOS tube can be turned on more reliably. Each MOS tube uses an independent device, and a device with a larger drain current can be selected to leave enough margin.

[0035] The multi-state controller also includes: a 5V output module, whose input end is connected to the 5V output port of the central processor, and whose output end is connected to the sensor powered by 5V voltage. The 5V output module can directly use +5V power supply to power some sensors.

[0036] The multi-state controller also includes: an encoder input module, whose input end is connected to the multi-channel pulse signal output by the device, and whose output end is connected to the encoder input end of the central processor. The encoder input module is used to obtain the frequency and duty cycle and the rotation direction. The encoder input module can determine the rotation direction based on the two signals with a phase difference of 90 degrees.

[0037] The multi-state controller also includes: a power module, whose input end is connected to the vehicle power supply, and whose output end is connected to the power input end of the central processor. The power module obtains the voltage required by the multi-state controller through a step-down circuit, and the power module supplies power to the entire multi-state controller.

[0038] The polymorphic controller also includes: a CAN communication module connected to the central processor. The CAN communication module is used to realize the communication between the central processor and other modules in the agricultural machinery or engineering machinery equipment.

[0039] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A polymorphic controller for agricultural machinery or engineering machinery, characterized in that: include: CPU; An analog signal input module, used to receive an analog signal, the analog signal is configured as a voltage input or a current input, its input end is connected to the multi-channel analog signal output by the device, and its output end is connected to the analog signal input end of the central processor; A digital signal input module, used for receiving digital signals, whose input end is connected to the multi-channel digital signals output by the device, and whose output end is connected to the digital signal input end of the central processor; the digital signal input module includes a push-pull high and low effective control circuit; A pulse signal input module, used for receiving pulse signals, whose input end is connected to the multi-channel pulse signals output by the device, and whose output end is connected to the pulse signal input end of the central processor; A high-side and low-side drive signal output module, whose input end is connected to the high-side and low-side drive signal output port of the central processing unit, and whose output end is connected to an external device driven by the high-side and low-side drive signals; The PWM signal output module has an input end connected to the PWM signal output port of the central processing unit, and an output end connected to an external device driven by the PWM signal.

2. The multi-state controller according to claim 1, characterized in that: The analog signal input module includes a pull-down circuit control circuit and a pull-up circuit control circuit.

3. The multi-state controller according to claim 1, characterized in that: The high-side and low-side drive signal output modules include a hardware overcurrent protection circuit.

4. The multi-state controller according to claim 1, characterized in that: The high-side and low-side drive signal output modules have an I / O output mode and a PWM output mode.

5. The multi-state controller according to claim 1, characterized in that: The PWM signal output module includes a PWM current feedback circuit.

6. The multi-state controller according to claim 1, characterized in that: The multi-state controller further comprises: The 5V output module has an input end connected to the 5V output port of the central processing unit, and an output end connected to a sensor powered by a 5V voltage.

7. The multi-state controller according to claim 1, characterized in that: The multi-state controller further comprises: The encoder input module has an input end connected to the multi-channel pulse signal output by the device, and an output end connected to the encoder input end of the central processor.

8. The multi-state controller according to claim 1, characterized in that: The multi-state controller further comprises: A power module, an input end of which is connected to the vehicle power supply, and an output end of which is connected to the power input end of the central processing unit.

9. The multi-state controller according to claim 1, characterized in that: The multi-state controller further comprises: The CAN communication module is connected to the central processing unit.

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