Signal interaction control expansion circuit and electronic control system

Abstract

The invention discloses a signal interaction control expansion circuit and an electronic control system. The signal interaction control expansion circuit comprises a first differential amplification circuit, a relay, a second differential amplification circuit, a third differential amplification circuit, an analog-to-digital conversion circuit and a control circuit. According to the invention, differential amplification processing is carried out on an output signal of the electronic control system through the first differential amplification circuit; the control circuit outputs a corresponding interaction control signal according to the output signal and controls the relay to be in a release state, so that the electronic control systems are connected in series; or, the relay is controlled to be in a pull-in state, so that the electronic control systems are connected in parallel, the control characteristic of the single electronic control system is expanded, the response speed of the multi-electronic control system is improved, the linearity is improved, and the problems that the control signal of the multi-electronic control system is poor in following performance and the precision is distorted are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile electronic control, and in particular to a signal interaction control expansion circuit and an electronic control system. Background Art

[0002] With the development of electronic control technology, more and more application scenarios require multiple electronic control systems to work together. Multiple electronic control systems need to share and process different analog and digital signals, which are widely used in the field of automotive electronic control. However, due to the diversity and control characteristics of automotive parts, the signal transmission between existing multiple electronic control systems has problems such as poor signal tracking, distortion and poor anti-interference ability, which makes it difficult to meet the requirements of high precision and high stability. Summary of the invention

[0003] The purpose of the present invention is to design a signal interaction control expansion circuit in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions: Signal interactive control expansion circuit, including: A first differential amplifier circuit, wherein an input end of the first differential amplifier circuit is connected to an electronic control system, a power supply end of the first differential amplifier circuit is connected to an extended reference voltage, and the first differential amplifier circuit is used to access an output signal of the electronic control system and perform differential amplification processing on the output signal; A relay, a second differential amplifier circuit, a third differential amplifier circuit, an analog-to-digital conversion circuit and a control circuit, wherein the control circuit is connected to the relay, the first differential amplifier circuit, the second differential amplifier circuit and the analog-to-digital conversion circuit respectively, an output end of the relay is connected to the electronic control system, an output end of the analog-to-digital conversion circuit is connected to a first input end of the third differential amplifier circuit, an output end of the second differential amplifier circuit is connected to a second input end of the third differential amplifier circuit, an output end of the third differential amplifier circuit is connected to the electronic control system, a power supply end of the second differential amplifier circuit is connected to the extended reference voltage, and a power supply end of the third differential amplifier circuit is connected to the extended reference voltage; The control circuit is used to output a corresponding interactive control signal according to the output signal, control the relay to be in a released state so that the electronic control systems are connected in series; or control the relay to be in a closed state so that the electronic control systems are connected in parallel.

[0005] The present invention also provides an electronic control system, which includes the above-mentioned signal interaction control expansion circuit.

[0006] The beneficial effects of the present invention are: The signal interaction control expansion circuit performs differential amplification processing on the output signal of the electronic control system through the first differential amplifier circuit; the control circuit outputs a corresponding interaction control signal according to the output signal, and controls the relay to be in a released state so that the electronic control systems are connected in series; or, controls the relay to be in an energized state so that the electronic control systems are connected in parallel, thereby expanding the control characteristics of a single electronic control system, improving the response speed of a multi-electronic control system, and improving the linearity, so as to solve the problems of poor followability and precision distortion of the control signal of the multi-electronic control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is an overall block diagram of the signal interaction control expansion circuit of the present invention; Figure 2 A circuit diagram of a signal interaction control expansion circuit of the present invention; In the figure: 10-electronic control system, 20-single power supply inversion circuit, 30-control circuit, 40-analog-to-digital conversion circuit, 50-relay, 60-first differential amplifier circuit, 70-second differential amplifier circuit, 80-third differential amplifier circuit, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, R7-seventh resistor, R8-eighth resistor, R9-ninth resistor, R10-tenth resistor, R11-eleventh resistor, R12-twelfth resistor, R 13-the thirteenth resistor, R14-the fourteenth resistor, R15-the fifteenth resistor, R16-the sixteenth resistor, R17-the seventeenth resistor, R20-the twentieth resistor, R21-the twenty-first resistor, R27-the twenty-seventh resistor, R28-the twenty-eighth resistor, R29-the twenty-ninth resistor, R32-the thirty-second resistor, R35-the thirty-fifth resistor, Q3-transistor, Q4-the first NPN transistor, Q5-the second NPN transistor, Q7-the third NPN transistor, Q6-the first PNP transistor, C5-the first capacitor. DETAILED DESCRIPTION

[0008] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0009] 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 invention claimed for protection, 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.

[0010] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0011] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0012] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0013] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0015] like Figure 1-2 As shown, the signal interaction control expansion circuit includes: A first differential amplifier circuit 60, wherein an input end of the first differential amplifier circuit 60 is connected to the electronic control system 10, a power supply end of the first differential amplifier circuit 60 is connected to an extended reference voltage, and the first differential amplifier circuit 60 is used to access an output signal of the electronic control system 10 and perform differential amplification processing on the output signal; A relay 50, a second differential amplifier circuit 70, a third differential amplifier circuit 80, an analog-to-digital conversion circuit 40 and a control circuit 30, wherein the control circuit 30 is respectively connected to the relay 50, the first differential amplifier circuit 60, the second differential amplifier circuit 70 and the analog-to-digital conversion circuit 40, an output end of the relay 50 is connected to the electronic control system 10, an output end of the analog-to-digital conversion circuit 40 is connected to a first input end of the third differential amplifier circuit 80, an output end of the second differential amplifier circuit 70 is connected to a second input end of the third differential amplifier circuit 80, an output end of the third differential amplifier circuit 80 is connected to the electronic control system 10, a power supply end of the second differential amplifier circuit 70 is connected to the extended reference voltage, and a power supply end of the third differential amplifier circuit 80 is connected to the extended reference voltage; The control circuit 30 is used to output a corresponding interactive control signal according to the output signal, control the relay 50 to be in a released state so that the electronic control system 10 is connected in series; or control the relay 50 to be in a closed state so that the electronic control system 10 is connected in parallel.

[0016] In one embodiment, the first differential amplifier circuit 60 , the second differential amplifier circuit 70 , and the third differential amplifier circuit 80 are TS321 bipolar operational amplifiers.

[0017] In one embodiment, the analog-to-digital conversion circuit 40 is a DAC7311 single-channel analog-to-digital converter, and the DAC7311 single-channel analog-to-digital converter is used to perform analog-to-digital conversion on the digital interactive control signal and then output an analog interactive control signal.

[0018] In this embodiment, the signal interaction control expansion circuit is provided with a connector, pin 1 of the connector is connected to the ground wire GND_R of the electronic control system 10, pin 3 is connected to the output control pin of the electronic control system 10, and pin 2 is connected to an external component or actuator; the number of electronic control systems 10 can be multiple. Among them, the control circuit 30 can be implemented by MCU, DSP (Digital Signal Process, digital signal processing chip), FPGA (Field Programmable Gate Array, programmable logic gate array chip), SOC (System On Chip, system-on chip) and other control circuits 30; the first differential amplifier circuit 60, the second differential amplifier circuit 70 and the third differential amplifier circuit 80 can use TS321 bipolar operational amplifier; the analog-to-digital conversion circuit 40 can use DAC7311 single-channel analog-to-digital converter.

[0019] In this embodiment, the gain Av of the TS321 bipolar operational amplifier is determined by the feedback resistor network, the input resistor is Rin, the feedback resistor is Rf, and the gain is calculated as: Av= 1 + Rf / Rin. It can be understood that the output control pin of the electronic control system 10 is connected in series with the sixth resistor R6 to the input pin 3 of the first TS321 bipolar operational amplifier; the ground line of the electronic control system 10 is connected in series with the seventh resistor R7 and the eighth resistor R8 to the input pin 4 of the first TS321 bipolar operational amplifier, and at the same time, the output pin 1 of the first TS321 bipolar operational amplifier is connected in series with the ninth resistor R9 and the input pin 4 to form a feedback resistor network. At this time, the output pin 1 eliminates the zero drift effect of the multi-electronic control system 10, so that the control circuit 30 can collect the output signal of the electronic control system 10 more accurately, and the ground line of the signal interaction control expansion circuit is connected in series with the thirteenth resistor R13 to the input pin 3 of the second TS321 bipolar operational amplifier. The ground line of the electronic control system 10 is short-circuited with the signal interaction control expansion circuit through the tenth resistor R10, and the eleventh resistor R11 and the twelfth resistor R12 are connected in series to the input pin 4 of the second TS321 bipolar operational amplifier. At the same time, the output pin 1 of the second TS321 bipolar operational amplifier is connected in series with the fourteenth resistor R14 and the input pin 4 to form a feedback resistor network. At this time, the output pin eliminates the zero drift influence of the dual (multi) electronic control system 10 and outputs the voltage fluctuation difference between the multiple electronic control systems 10. The control circuit 30 is connected to the DAC7311 single-channel analog-to-digital converter through SPI full-duplex communication control to output the target physical signal, and the fifteenth resistor R15 is connected in series to the input pin 3 of the third TS321 bipolar operational amplifier; the output pin 1 of the second TS321 bipolar operational amplifier is connected in series with the sixteenth resistor R16 to the input pin 4 of the third TS321 bipolar operational amplifier. At the same time, the output pin 1 of the third TS321 bipolar operational amplifier is connected in series with the seventeenth resistor R17 and the input pin 4 to form a feedback resistor network. The final output of the signal interaction control expansion circuit eliminates its own interference with the external electronic control system 10, and also ensures that the output signal fully meets the accuracy of the external system control.

[0020] The signal interaction control expansion circuit of the present invention performs differential amplification processing on the output signal of the electronic control system 10 through the first differential amplifier circuit 60; the control circuit 30 outputs a corresponding interaction control signal according to the output signal, and controls the relay 50 to be in a released state so that the electronic control systems 10 are connected in series; or, controls the relay 50 to be in an attracted state so that the electronic control systems 10 are connected in parallel, thereby expanding the control characteristics of the single electronic control system 10, improving the response speed of the multi-electronic control system 10, and improving the linearity, so as to solve the problems of poor followability and precision distortion of the control signals of the multi-electronic control systems 10.

[0021] In one embodiment, the signal interaction control expansion circuit further includes a transistor Q3 , and the transistor Q3 is disposed between the control circuit 30 and the relay 50 .

[0022] In this embodiment, the control circuit 30 is connected to the relay 50 through the transistor Q3, and the control current will reach the pull-in threshold of the relay 50 faster, so that the output state switching is faster and the response is more sensitive. Among them, the transistor Q3 is implemented by an NPN transistor. Since the NPN transistor has the characteristics of high current and low voltage, the state switching of the relay 50 is more sensitive and accurate, and the voltage linearity when the output state is switched is guaranteed, which expands the control characteristics of the series electronic control system 10.

[0023] In one embodiment, the signal interaction control expansion circuit also includes a single power inversion circuit 20, the output end of the single power inversion circuit 20 is connected to the first differential amplifier circuit 60, the second differential amplifier circuit 70 and the third differential amplifier circuit 80, and the single power inversion circuit 20 is used to access the power signal and invert the power signal to provide the extended reference voltage for the first differential amplifier circuit 60, the second differential amplifier circuit 70 and the third differential amplifier circuit 80.

[0024] In one embodiment, the single power supply inversion circuit 20 includes a power supply terminal, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C5, a first NPN transistor Q4, a second NPN transistor Q5, a third NPN transistor Q7 and a first PNP transistor Q6; the power supply terminal is connected in series with the first resistor R1 to the base of the first NPN transistor Q4, the power supply terminal is connected in series with the second resistor R2 to the collector of the first NPN transistor Q4, and the emitter of the first NPN transistor Q4 is grounded; the power supply terminal is connected in series with the third resistor R3 to the base of the second NPN transistor Q5, the power supply terminal is connected in series with the fourth resistor R4 The resistor R4 is connected to the collector of the second NPN transistor Q5, and the emitter of the second NPN transistor Q5 is grounded; the collector of the first NPN transistor Q4 is connected in series with the first capacitor C5 and connected to the base of the second NPN transistor Q5; the power supply end is connected to the collector of the third NPN transistor Q7, the base of the first NPN transistor Q4 is connected in parallel with the collector of the second NPN transistor Q5 and then connected in series with the fifth resistor R5 to connect the base of the third NPN transistor Q7 and the base of the first PNP transistor Q6; the emitter of the third NPN transistor Q7 is connected to the collector of the first PNP transistor Q6; the emitter of the first PNP transistor Q6 is grounded.

[0025] In this embodiment, the single power supply inversion circuit 20 utilizes the characteristics of transistors. When the input signal is a high-level power supply signal VBAT, the transistor is turned on, and the output terminal level is regarded as grounded, that is, the voltage is 0V; when the input signal is a low level of 0V, the transistor is turned off, and the output terminal will follow the high-level voltage to form an inversion voltage -VBAT, that is, the connection point between the emitter of the third NPN transistor Q7 and the collector of the first PNP transistor Q6 is an inversion voltage, so as to increase the stability of the circuit and reduce the output fluctuation caused by the characteristic differences between different transistors.

[0026] The present invention also proposes an electronic control system 10, which includes the above-mentioned signal interaction control expansion circuit; the specific structure of the signal interaction control expansion circuit refers to the above-mentioned embodiment. Since the electronic control system 10 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0027] In this embodiment, the 3rd pin of the connector is connected in series with the eighth resistor R8 to the 3rd pin of the first TS321 bipolar operational amplifier, the 1st pin GND_R of the connector is connected in series with the 13th resistor R13 and the 11th resistor R11 to the 4th pin of the first TS321 bipolar operational amplifier, and at the same time, the 1st pin and the 4th pin of the first TS321 bipolar operational amplifier are connected through the 14th resistor R14, and the AD1 voltage of the control circuit 30 is: V AD1 = (V3 - V4) * (1 + R14 / R11).

[0028] The control circuit 30 is connected to the DAC 7311 analog-to-digital converter through CLK, MOSI, and SEL to accurately control the output VOUT6. VOUT6 is connected in series with the twenty-seventh resistor R27 and connected to the 3rd pin of the second TS321 bipolar operational amplifier; GND_R is connected in series with the thirty-fifth resistor R35 and short-circuited with PGND, which is the voltage difference ΔVs of the multi-electronic control system 10. The thirty-first resistor and the thirty-second resistor R32 are connected in series to the 4th pin of the third TS321 bipolar operational amplifier. PGND is connected to the 3rd pin of the third TS321 bipolar operational amplifier. The voltage of the 1st pin of the third TS321 bipolar operational amplifier is: V1 = (PGND - (PGND - GND_R)) * (1 + R33 / R32); V1 is connected in series with the twenty-ninth resistor R29 and connected to the 4th pin of the second TS321 bipolar operational amplifier. The 1st and 4th pins of the second TS321 bipolar operational amplifier are connected in series with the twenty-eighth resistor R28. At this time, the final output of the signal interaction control expansion circuit is: Vout = (VOUT6–V1) * (1 + R28 / R29); The RELAYCON pin of the control circuit 30 is connected in series with the twenty-first resistor R21 to the base of the transistor Q3, the collector of the transistor Q3 is connected to the negative power supply electrode of the relay 50, the emitter of the transistor Q3 is connected to PGND, the positive power supply electrode of the relay 50 is connected to the +12V power supply, the normally closed end is connected to pin 3 of the connector, the 1st TS321 bipolar operational amplifier is connected in series with the twentieth resistor R20 to the normally open end, pin 2 of the connector is connected to the output pin of the relay 50, and the AD2 of the control circuit 30 is connected in series with the seventeenth resistor R17 to pin 2 of the connector.

[0029] In the present invention, when the control circuit 30 determines that the driving characteristics of the external component or actuator are met based on the precise voltage of the 3 pins of the connector, the relay 50 is in a normally open state and will be directly controlled by the external electronic control system 10; when the relay 50 is in a closed state, it will be controlled by the signal interactive control expansion circuit. The results show that the control accuracy of the two is similar to 99%. When the control circuit 30 determines that the driving characteristics of the external component or actuator are not met based on the precise voltage of the 3 pins of the connector, the relay 50 will be controlled to be in a closed state and directly controlled by the signal interactive control expansion circuit. The results show that the linearity remains at 90% and the accuracy is similar to 99%.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A signal interaction control expansion circuit for series-parallel electronic control systems, characterized in that: The signal interaction control expansion circuit comprises: A first differential amplifier circuit, wherein an input end of the first differential amplifier circuit is connected to an electronic control system, a power supply end of the first differential amplifier circuit is connected to an extended reference voltage, and the first differential amplifier circuit is used to access an output signal of the electronic control system and perform differential amplification processing on the output signal; A relay, a second differential amplifier circuit, a third differential amplifier circuit, an analog-to-digital conversion circuit and a control circuit, wherein the control circuit is connected to the relay, the first differential amplifier circuit, the second differential amplifier circuit and the analog-to-digital conversion circuit respectively, an output end of the relay is connected to the electronic control system, an output end of the analog-to-digital conversion circuit is connected to a first input end of the third differential amplifier circuit, an output end of the second differential amplifier circuit is connected to a second input end of the third differential amplifier circuit, an output end of the third differential amplifier circuit is connected to the electronic control system, a power supply end of the second differential amplifier circuit is connected to the extended reference voltage, and a power supply end of the third differential amplifier circuit is connected to the extended reference voltage; The control circuit is used to output a corresponding interactive control signal according to the output signal, control the relay to be in a released state so that the electronic control system is connected in series; or control the relay to be in a closed state so that the electronic control system is connected in parallel.

2. The signal interaction control expansion circuit according to claim 1, characterized in that: The signal interaction control expansion circuit also includes a triode, and the triode is arranged between the control circuit and the relay.

3. The signal interaction control expansion circuit according to claim 1, characterized in that: The signal interaction control expansion circuit also includes a single power inversion circuit, the output end of the single power inversion circuit is connected to the first differential amplifier circuit, the second differential amplifier circuit and the third differential amplifier circuit, and the single power inversion circuit is used to access the power signal and invert the power signal to provide the extended reference voltage for the first differential amplifier circuit, the second differential amplifier circuit and the third differential amplifier circuit.

4. The signal interaction control expansion circuit according to claim 3, characterized in that: The single power supply inversion circuit includes a power supply end, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a first NPN transistor, a second NPN transistor, a third NPN transistor and a first PNP transistor; the power supply end is connected in series with the first resistor to the base of the first NPN transistor, the power supply end is connected in series with the second resistor to the collector of the first NPN transistor, and the emitter of the first NPN transistor is grounded; the power supply end is connected in series with the third resistor to the base of the second NPN transistor, the power supply end is connected in series with the fourth resistor to the collector of the second NPN transistor, and the emitter of the second NPN transistor is grounded; the collector of the first NPN transistor is connected in series with the first capacitor to the base of the second NPN transistor; the power supply end is connected to the collector of the third NPN transistor, the base of the first NPN transistor is connected in parallel with the collector of the second NPN transistor, and then connected in series with the fifth resistor to the base of the third NPN transistor and the base of the first PNP transistor; the emitter of the third NPN transistor is connected to the collector of the first PNP transistor; the emitter of the first PNP transistor is grounded.

5. The signal interaction control expansion circuit according to claim 1, characterized in that: The first differential amplifier circuit, the second differential amplifier circuit and the third differential amplifier circuit are TS321 bipolar operational amplifiers.

6. The signal interaction control expansion circuit according to claim 1, characterized in that: The analog-to-digital conversion circuit is a DAC7311 single-channel analog-to-digital converter, and the DAC7311 single-channel analog-to-digital converter is used to perform analog-to-digital conversion on a digital interactive control signal and then output an analog interactive control signal.

7. An electronic control system, characterized in that: The electronic control system includes the signal interaction control expansion circuit as described in any one of claims 1-6.

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