Multi-signal processing circuit and automobile

Abstract

The present application relates to a multi-signal processing circuit and a car. Among them, the multi-signal processing circuit includes a signal superposition circuit, a voltage divider circuit, a first signal separation circuit and a second signal separation circuit; the signal superposition circuit includes a first voltage divider resistor; the voltage divider circuit includes a second voltage divider resistor; the first end of the first voltage divider resistor is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage divider resistor, the first input end of the first signal separation circuit and the first input end of the second signal separation circuit; the second end of the second voltage divider resistor is grounded; the second input end of the first signal separation circuit is connected to the first reference voltage, and the output end is used to connect the vehicle-mounted electronic equipment; the second input end of the second signal separation circuit is connected to the second reference voltage, and the output end is used to connect the vehicle-mounted electronic equipment. The ignition signal, the left turn signal and the right turn signal can be transmitted through a wiring harness, which effectively reduces the wiring harness cost.

Description

Technical Field

[0001] The present application relates to the technical field of automobile signal processing, and in particular to a multi-signal processing circuit and an automobile. Background Art

[0002] With the development of automobile electrification and automation, the length of wiring harnesses is getting longer and longer, and the cost of wiring harnesses is getting higher and higher. On some models of cars / trucks, multiple signals such as left turn signal, right turn signal, ignition signal, etc., each signal is transmitted by a separate wire. Generally speaking, the length of the wiring harness on an ordinary car may be as long as 4km.

[0003] During the implementation process, the inventors found that there are at least the following problems in the traditional technology: traditional automobiles have the problem of high wiring harness costs. Summary of the invention

[0004] Based on this, it is necessary to provide a multi-signal processing circuit and a car that can save wiring harness costs in response to the above technical problems.

[0005] In order to achieve the above-mentioned object, on the one hand, an embodiment of the present invention provides a multi-signal processing circuit, a signal superposition circuit, a voltage dividing circuit, a first signal separation circuit and a second signal separation circuit; the signal superposition circuit includes a first voltage dividing resistor; the voltage dividing circuit includes a second voltage dividing resistor;

[0006] The first end of the first voltage-dividing resistor is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor, the first input end of the first signal separation circuit, and the first input end of the second signal separation circuit; the second end of the second voltage-dividing resistor is grounded; the second input end of the first signal separation circuit is connected to the first reference voltage, and the output end is used to connect the on-board electronic equipment; the second input end of the second signal separation circuit is connected to the second reference voltage, and the output end is used to connect the on-board electronic equipment.

[0007] In one of the embodiments, the signal superposition circuit further includes a first diode and a second diode;

[0008] The anode of the first diode is connected to the left turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor; the anode of the second diode is connected to the right turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor.

[0009] In one embodiment, the first signal separation circuit includes a first comparator;

[0010] The first input end of the first comparator is respectively connected to the first end of the second voltage-dividing resistor and the output end of the signal superposition circuit, the second input end is connected to the first reference voltage, and the output end is used to connect to the vehicle-mounted electronic equipment.

[0011] In one embodiment, the second signal separation circuit includes a second comparator;

[0012] The first input end of the second comparator is respectively connected to the first end of the second voltage-dividing resistor and the output end of the signal superposition circuit, the second input end is connected to the second reference voltage, and the output end is used to connect to the vehicle-mounted electronic equipment.

[0013] In one embodiment, the first input terminal of the first comparator is a non-inverting input terminal, and the second input terminal is an inverting input terminal;

[0014] The first input terminal of the second comparator is a non-inverting input terminal, and the second input terminal is an inverting input terminal.

[0015] In one embodiment, it also includes an input filtering circuit;

[0016] The input end of the input filter circuit is connected to the first end of the second voltage-dividing resistor, and the other end is respectively connected to the first input end of the first signal separation circuit and the first input end of the second signal separation circuit.

[0017] In one embodiment, the input filter circuit includes an input filter resistor and an input filter capacitor;

[0018] One end of the input filter resistor is connected to the first end of the second voltage divider resistor, and the other end is respectively connected to the first input end of the first signal separation circuit, the first input end of the second signal separation circuit and one end of the input filter capacitor; the other end of the input filter capacitor is grounded.

[0019] In one embodiment, it further includes an output filtering circuit;

[0020] The first end of the output filter circuit is connected to an external power supply, the second end is grounded, and the third end is connected to the output end of the second signal separation circuit.

[0021] In one embodiment, the output filter circuit includes an output filter resistor and an output filter capacitor;

[0022] One end of the output filter resistor is connected to the output end of the second comparator, and the other end is connected to the external power supply; one end of the output filter capacitor is connected to the output end of the second comparator, and the other end is grounded.

[0023] On the other hand, an embodiment of the present invention further provides a car, comprising any of the multi-signal processing circuits described above.

[0024] One of the above technical solutions has the following advantages and beneficial effects:

[0025] The above-mentioned multi-signal processing circuit superimposes the ignition signal transmitted by the ignition signal line, the left turn signal transmitted by the left turn signal line, and the right turn signal transmitted by the right turn signal line through the signal superposition circuit, so that the ignition signal, the left turn signal, and the right turn signal can be transmitted through a wiring harness, effectively reducing the wiring harness cost. The superimposed ignition signal, the left turn signal, and the right turn signal are separated into an ignition signal and a turn signal (including a left turn signal and a right turn signal) through a voltage divider circuit, a first signal separation circuit, and a second signal separation circuit. Only two wiring harnesses are needed to output the ignition signal and the turn signal, thereby reducing the number of wire cores of the vehicle-mounted electronic equipment wiring harness, which is beneficial to wiring and saves space for the wire tube in the vehicle. Furthermore, the vehicle-mounted electronic equipment can use connectors with fewer pins, reducing the connector cost of the vehicle-mounted electronic equipment, while also reducing the cost of anti-static devices of the vehicle-mounted electronic equipment, and reducing the risk of electrostatic failure of the vehicle-mounted electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other purposes, features and advantages of the present application will become clearer through a more specific description of the preferred embodiments of the present application shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the drawings are not deliberately scaled to the actual size, and the focus is on illustrating the subject matter of the present application.

[0027] Figure 1 is a first schematic structural block diagram of a multi-signal processing circuit in one embodiment;

[0028] Figure 2 is a second schematic structural block diagram of a multi-signal processing circuit in one embodiment;

[0029] Figure 3 is a third schematic structural block diagram of a multi-signal processing circuit in one embodiment;

[0030] Figure 4 is a fourth schematic structural block diagram of a multi-signal processing circuit in one embodiment;

[0031] Figure 5 FIG. 5 is a fifth schematic structural block diagram of a multi-signal processing circuit in an embodiment. DETAILED DESCRIPTION

[0032] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0034] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0035] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0036] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0037] In one embodiment, Figure 1 As shown, a multi-signal processing circuit is provided, including a signal superposition circuit 10 ( Figure 1 Not shown), voltage divider circuit 20 ( Figure 1 Not shown), a first signal separation circuit 30 and a second signal separation circuit 40; the signal superposition circuit includes a first voltage-dividing resistor R1; the voltage-dividing circuit includes a second voltage-dividing resistor R2;

[0038] The first end of the first voltage-dividing resistor R1 is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor R2, the first input end of the first signal separation circuit 30 and the first input end of the second signal separation circuit 40 respectively; the second end of the second voltage-dividing resistor R2 is grounded; the second input end of the first signal separation circuit 30 is connected to the first reference voltage, and the output end is used to connect the on-board electronic equipment; the second input end of the second signal separation circuit 40 is connected to the second reference voltage, and the output end is used to connect the on-board electronic equipment.

[0039] Among them, the signal superposition circuit can be any circuit in the art that can synthesize different signals together, and in the present application specifically synthesizes the ignition signal, the left turn signal and the right turn signal together. The voltage divider circuit can be any circuit in the art that can perform voltage division, and is used to divide the ignition signal. The first signal separation circuit and the second signal separation circuit are used to separate the synthesized signals. The ignition signal line, the left turn signal line and the right turn signal line are inherent signal lines in the vehicle. The on-board electronic device can be any on-board electronic device in the art, including but not limited to ADAS (Advanced Driving Assistance System) and other equipment.

[0040] Specifically, the ignition signal is a voltage signal, and the voltage value is obtained according to the voltage of the car battery. For example, if the car uses a 12V battery, when the car is ignited, the ignition signal is a 12V voltage signal, and when the car is turned off, the ignition signal is a 0V voltage signal. Correspondingly, the left turn signal is also a voltage signal. If the car uses a 12V battery, when the car responds and outputs a left turn signal, the left turn signal is a 1Hz square wave signal with a maximum of 12V and a minimum of 0V. The right turn signal is also a voltage signal. If the car uses a 12V battery, when the car responds and outputs a right turn signal, the right turn signal is a 1Hz square wave signal with a maximum of 12V and a minimum of 0V. When the car uses a battery of other voltages, the ignition signal, the left turn signal and the right turn signal change accordingly.

[0041] The signal superposition circuit superimposes the ignition signal transmitted by the ignition signal line, the left turn signal transmitted by the left turn signal line, and the right turn signal transmitted by the right turn signal line. The voltage divider circuit is used to step down the voltage value of the ignition signal in the form of voltage division. Therefore, the maximum voltages of the ignition signal and the turn signal (left turn signal, right turn signal) are different. The superimposed ignition signal, the left turn signal, and the right turn signal can be separated according to the difference in voltage by the first signal separation circuit and the second separation circuit. It can be understood that "first" and "second" are only used to distinguish the first signal separation circuit from another signal separation circuit. For example, without departing from the scope of the present application, the first signal separation circuit can be referred to as the second signal separation circuit, and similarly, the second signal separation circuit can be referred to as the first signal separation circuit. Both the first signal separation circuit and the second signal separation circuit are signal separation circuits, but they are not the same signal separation circuit.

[0042] In the case where the on-board electronic device is ADAS, the left turn signal or the right turn signal is used to suppress the lane departure alarm signal in the ADAS system. Regardless of whether the left turn or the right turn is made, the final effect is to suppress the lane departure signal (at this time, the lane departure is the driver's intentional behavior). Therefore, there is no need to distinguish between left turn and right turn in the ADAS driving system. That is, it is only necessary to separate the turn signal (left turn signal and right turn signal) from the ignition signal. In one embodiment, the voltage divider circuit includes a resistor R2, a first end of the resistor R2 is connected to the output end of the signal superposition circuit, and a second end is grounded.

[0043] The above-mentioned multi-signal processing circuit superimposes the ignition signal transmitted by the ignition signal line, the left turn signal transmitted by the left turn signal line, and the right turn signal transmitted by the right turn signal line through the signal superposition circuit, so that the ignition signal, the left turn signal, and the right turn signal can be transmitted through a wiring harness, effectively reducing the wiring harness cost. The superimposed ignition signal, the left turn signal, and the right turn signal are separated into an ignition signal and a turn signal (including a left turn signal and a right turn signal) through a voltage divider circuit, a first signal separation circuit, and a second signal separation circuit. Only two wiring harnesses are needed to output the ignition signal and the turn signal, thereby reducing the number of wire cores of the vehicle-mounted electronic equipment wiring harness, which is beneficial to wiring and saves space for the wire tube in the vehicle. Furthermore, the vehicle-mounted electronic equipment can use connectors with fewer pins, reducing the connector cost of the vehicle-mounted electronic equipment, while also reducing the cost of anti-static devices of the vehicle-mounted electronic equipment, and reducing the risk of electrostatic failure of the vehicle-mounted electronic equipment.

[0044] In one embodiment, Figure 2 As shown, a multi-signal processing circuit is provided, a signal superposition circuit 10 ( Figure 2 Not shown), voltage divider circuit 20 ( Figure 2 Not shown), a first signal separation circuit 30 and a second signal separation circuit 40; the signal superposition circuit includes a first voltage-dividing resistor R1; the voltage-dividing circuit includes a second voltage-dividing resistor R2;

[0045] The first end of the first voltage-dividing resistor R1 is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor R2, the first input end of the first signal separation circuit 30 and the first input end of the second signal separation circuit 40 respectively; the second end of the second voltage-dividing resistor R2 is grounded; the second input end of the first signal separation circuit 30 is connected to the first reference voltage, and the output end is used to connect the on-board electronic equipment; the second input end of the second signal separation circuit 40 is connected to the second reference voltage, and the output end is used to connect the on-board electronic equipment.

[0046] Wherein, the signal superposition circuit 10 includes a first diode D1 and a second diode D2;

[0047] The anode of the first diode D1 is connected to the left turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor R2; the anode of the second diode D2 is connected to the right turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor R2.

[0048] Specifically, the first voltage-dividing resistor and the second voltage-dividing resistor are used to divide the voltage of the ignition signal. Taking the first voltage-dividing resistor as 100K ohms, the second voltage-dividing resistor as 200K ohms, and a 12V battery as an example, the ignition signal is output to the first signal separation circuit and the second signal separation circuit after voltage division as a signal with a maximum of 8V and a minimum of 0V. When the ignition signal is superimposed with the turn signal, the superimposed signal becomes a 1Hz square wave signal with a maximum of 12V and a minimum of 8V. When there is only a turn signal (including left turn signal and right turn signal), it is a square wave signal with a maximum of 12V and a minimum of 0V.

[0049] In one embodiment, Figure 3 As shown, a multi-signal processing circuit is provided, including a signal superposition circuit, a voltage dividing circuit, a first signal separation circuit and a second signal separation circuit; the signal superposition circuit includes a first voltage dividing resistor R1; the voltage dividing circuit includes a second voltage dividing resistor R2;

[0050] The first end of the first voltage-dividing resistor R1 is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor R2, the first input end of the first signal separation circuit 30 and the first input end of the second signal separation circuit 40 respectively; the second end of the second voltage-dividing resistor R2 is grounded; the second input end of the first signal separation circuit 30 is connected to the first reference voltage, and the output end is used to connect the on-board electronic equipment; the second input end of the second signal separation circuit 40 is connected to the second reference voltage, and the output end is used to connect the on-board electronic equipment.

[0051] Wherein, the first signal separation circuit includes a first comparator U1;

[0052] The first input end of the first comparator U1 is respectively connected to the first end of the second voltage-dividing resistor R2 and the output end of the signal superposition circuit 10 , the second input end is connected to the first reference voltage, and the output end is used to connect to the vehicle-mounted electronic equipment.

[0053] The second signal separation circuit includes a second comparator U2;

[0054] The first input end of the second comparator U2 is respectively connected to the first end of the second voltage-dividing resistor R2 and the output end of the signal superposition circuit 10 , the second input end is connected to the second reference voltage, and the output end is used to connect to the vehicle-mounted electronic equipment.

[0055] Specifically, the superimposed signal, that is, the superimposed signal of the ignition signal, the left turn signal and the right turn signal, is separated by a comparator. It should be noted that the first reference voltage and the second reference voltage have different values.

[0056] The voltage divider circuit is used to reduce the voltage of the ignition signal. The superimposed signal can be separated by comparing the voltage of the superimposed signal through the first comparator. For example, taking a 12V car battery as an example, the highest voltage of the ignition signal after voltage reduction is X, where X is between 0 and 12V, which is obtained according to the voltage dividing capacity of the voltage divider circuit. Therefore: when the turn signal is not on and the ignition is on, the superimposed signal is: XV; when the turn signal is not on and the ignition is not on, the superimposed signal is: 0V; when the turn signal is on and the ignition is on, the superimposed signal is: 1Hz jump between 12V / XV; when the turn signal is on and the ignition is not on, the superimposed signal is: 1Hz jump between 12V / 0V. The first reference voltage can be set to a voltage between X and 12V. As long as there are left and right turn signals, that is, there must be a voltage greater than the first reference voltage, the first comparator determines whether there are left and right turn signals in the superimposed signal by comparing the superimposed signal with the first reference voltage. In one embodiment, the first input terminal of the first comparator is a positive input terminal, and the second input terminal is an inverting input terminal; that is, if the voltage of the superimposed signal input to the positive input terminal is greater than the first reference voltage, it can be determined that there must be left and right turn signals in the superimposed signal, and the first comparator outputs a high-level signal, that is, the left and right turn signals are restored. The second reference voltage can be set to a voltage between 0V and XV. That is, as long as there is an ignition signal, there must be a signal greater than the second reference voltage. In a specific example, the first input terminal of the second comparator is a positive input terminal, and the second input terminal is an inverting input terminal. That is, if the voltage of the superimposed signal input to the positive input terminal is greater than the second reference voltage, it can be determined that there must be an ignition signal in the superimposed signal, and the second comparator outputs a high-level signal. When it is 0V, it outputs a low-level signal, that is, the ignition signal is separated.

[0057] In one embodiment, Figure 4 As shown, a multi-signal processing circuit is provided, a signal superposition circuit 10 ( Figure 4 Not shown), voltage divider circuit 20 ( Figure 4 Not shown), a first signal separation circuit 30 and a second signal separation circuit 40; the signal superposition circuit includes a first voltage-dividing resistor R1; the voltage-dividing circuit includes a second voltage-dividing resistor R2;

[0058] The first end of the first voltage-dividing resistor R1 is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor R2, the first input end of the first signal separation circuit 30 and the first input end of the second signal separation circuit 40 respectively; the second end of the second voltage-dividing resistor R2 is grounded; the second input end of the first signal separation circuit 30 is connected to the first reference voltage, and the output end is used to connect the on-board electronic equipment; the second input end of the second signal separation circuit 40 is connected to the second reference voltage, and the output end is used to connect the on-board electronic equipment.

[0059] Also includes an input filter circuit 50;

[0060] An input end of the input filter circuit 50 is connected to a first end of the second voltage-dividing resistor R2 , and the other end is connected to a first input end of the first signal separation circuit 30 and a first input end of the second signal separation circuit 40 .

[0061] Specifically, the input filter circuit may be an RC filter circuit, which removes clutter by filtering the superimposed signal.

[0062] In one embodiment, the input filter circuit includes an input filter resistor and an input filter capacitor;

[0063] One end of the input filter resistor is connected to the first end of the second voltage divider resistor, and the other end is respectively connected to the first input end of the first signal separation circuit, the first input end of the second signal separation circuit and one end of the input filter capacitor; the other end of the input filter capacitor is grounded.

[0064] Specifically, the cut-off frequency of the input filter circuit can be calculated according to the resistance of the input filter resistor and the capacitance of the input filter capacitor.

[0065] In one embodiment, Figure 5 As shown, a multi-signal processing circuit is provided, a signal superposition circuit 10 ( Figure 5 Not shown), voltage divider circuit 20 ( Figure 5 Not shown), a first signal separation circuit 30 and a second signal separation circuit 40; the signal superposition circuit includes a first voltage-dividing resistor R1; the voltage-dividing circuit includes a second voltage-dividing resistor R2;

[0066] The first end of the first voltage-dividing resistor R1 is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor R2, the first input end of the first signal separation circuit 30 and the first input end of the second signal separation circuit 40 respectively; the second end of the second voltage-dividing resistor R2 is grounded; the second input end of the first signal separation circuit 30 is connected to the first reference voltage, and the output end is used to connect the on-board electronic equipment; the second input end of the second signal separation circuit 40 is connected to the second reference voltage, and the output end is used to connect the on-board electronic equipment.

[0067] Also includes an input filter circuit 50;

[0068] An input end of the input filter circuit 50 is connected to a first end of the second voltage-dividing resistor R2 , and the other end is connected to a first input end of the first signal separation circuit 30 and a first input end of the second signal separation circuit 40 .

[0069] Also includes an output filter circuit 60;

[0070] A first end of the output filter circuit 60 is connected to an external power source, a second end is grounded, and a third end is connected to an output end of the second signal separation circuit 40 .

[0071] Specifically, the left turn signal and / or the right turn signal in the superimposed signal may have voltage jumps, such as a 1Hz voltage jump with a maximum of 12V and a minimum of 0V, and an output filter circuit is used to filter out the voltage jump. For example, an output filter circuit with a cutoff frequency of 0.06 Hz can be used for filtering.

[0072] In one embodiment, the output filter circuit includes an output filter resistor and an output filter capacitor;

[0073] One end of the output filter resistor is connected to the output end of the second comparator, and the other end is connected to the external power supply; one end of the output filter capacitor is connected to the output end of the second comparator, and the other end is grounded.

[0074] Specifically, the cutoff frequency can be adjusted by adjusting the resistance of the output filter resistor and the capacitance of the output filter capacitor. When the turn signal is on but the ignition is not on, the superimposed signal is a 1Hz signal with a 12V / 0V jump. At this time, the output signal of the second separation circuit is superimposed with the interference of the turn signal, which needs to be filtered out by the output filter circuit.

[0075] In one embodiment, a driving assistance device is also provided, comprising any of the multi-signal processing circuits described above.

[0076] For example, the multi-signal processing circuit includes a signal superposition circuit, a voltage dividing circuit, a first signal separation circuit and a second signal separation circuit; the signal superposition circuit includes a first voltage dividing resistor; the voltage dividing circuit includes a second voltage dividing resistor;

[0077] The first end of the first voltage-dividing resistor is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor, the first input end of the first signal separation circuit, and the first input end of the second signal separation circuit; the second end of the second voltage-dividing resistor is grounded; the second input end of the first signal separation circuit is connected to the first reference voltage, and the output end is used to connect the vehicle-mounted electronic equipment; the second input end of the second signal separation circuit is connected to the second reference voltage, and the output end is used to connect the vehicle-mounted electronic equipment. The second input end of the second signal separation circuit is connected to the second reference voltage, and the output end is used to connect the vehicle-mounted electronic equipment. The signal superposition circuit also includes a first diode and a second diode; the anode of the first diode is connected to the left turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor; the anode of the second diode is connected to the right turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor.

[0078] The multi-signal processing circuit also includes an input filtering circuit and an output filtering circuit;

[0079] The input end of the input filter circuit is connected to the first end of the second voltage-dividing resistor, and the other end is respectively connected to the first input end of the first signal separation circuit and the first input end of the second signal separation circuit. The first end of the output filter circuit is connected to an external power supply, the second end is grounded, and the third end is connected to the output end of the second signal separation circuit.

[0080] The above-mentioned driving assistance device superimposes the ignition signal transmitted by the ignition signal line, the left turn signal transmitted by the left turn signal line, and the right turn signal transmitted by the right turn signal line through the signal superposition circuit, so that the ignition signal, the left turn signal, and the right turn signal can be transmitted through one wiring harness, effectively reducing the wiring harness cost. The superimposed ignition signal, the left turn signal, and the right turn signal are separated into an ignition signal and a turn signal (including a left turn signal and a right turn signal) through a voltage divider circuit, a first signal separation circuit, and a second signal separation circuit. Only two wiring harnesses are needed to output the ignition signal and the turn signal, thereby reducing the number of wire cores of the vehicle-mounted electronic equipment wiring harness, which is beneficial to wiring and saves space for the wire tube in the vehicle. Furthermore, in the driving assistance device, the left turn signal or the right turn signal is used to suppress the lane departure warning signal. Regardless of whether the vehicle turns left or right, the final effect is to suppress the lane departure signal. Therefore, the left turn signal and the right turn signal can share a line to connect to the driving assistance device, that is, the auxiliary device is connected through the second signal separation circuit, so that the driving assistance device can use a connector with fewer pins, reducing the connector cost of the driving assistance device, and also reducing the cost of the anti-static device of the driving assistance device, thereby reducing the risk of electrostatic failure of the driving assistance device.

[0081] In order to further illustrate the multi-signal processing circuit of the present application, a specific example is specifically described below:

[0082] At the vehicle end, the ignition signal line, the left turn signal line, and the right turn signal line are modulated into one signal (ie, the above-mentioned superimposed signal) through a signal superposition circuit.

[0083] If the car uses a 12V battery, when the car is ignited, the ignition signal becomes 12V, and when the car is turned off, the ignition signal becomes 0V. When the turn signal is turned on, the corresponding turn signal is a 1Hz square wave with a maximum of 12V and a minimum of 0V. The analysis process is similar when the car uses batteries of other voltages.

[0084] Taking the first voltage-dividing resistor as 100k ohms and the second voltage-dividing resistor as 200k ohms as an example, after the automobile ignition signal is divided, the three-wire-in-one signal (i.e., the superimposed signal) becomes an 8V / 0V signal. When the ignition signal is superimposed with the turn signal, the three-wire-in-one signal becomes a 12V / 8V 1Hz square wave signal. When there is no ignition signal but only the turn signal, the three-wire-in-one signal is still a 1Hz square wave with a maximum of 12V and a minimum of 0V.

[0085] The circuit for signal separation includes a comparator 1 / comparator 2 (ie, the first signal separation circuit / second signal separation circuit mentioned above), a voltage divider circuit, an input filter circuit, and an output filter circuit.

[0086] According to the characteristics of the input signal, when the car uses a 12V battery (other voltage analysis processes are similar), taking R1 as 100k ohms and the equivalent resistance of the voltage divider circuit as 200k ohms as an example, the left and right turn signals can be directly restored using a 10V comparator threshold. The ignition signal can be restored using a 6V comparator threshold voltage, but when the turn signal is on, the signal may have a 1Hz voltage jump of 12V / 0V. Using a 0.06Hz output filter circuit, combined with the values ​​of the output filter capacitor and the output filter resistor (the rear capacitor charges slowly and discharges quickly), the 12V voltage jump superimposed on the ignition signal can be filtered out.

[0087] In one embodiment, a car is provided, comprising any of the multi-signal processing circuits described above.

[0088] For example, the multi-signal processing circuit includes a signal superposition circuit, a voltage divider circuit, a first signal separation circuit, and a second signal separation circuit; the signal superposition circuit includes a first voltage divider resistor; the voltage divider circuit includes a second voltage divider resistor; the first end of the first voltage divider resistor is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage divider resistor, the first input end of the first signal separation circuit, and the first input end of the second signal separation circuit; the second end of the second voltage divider resistor is grounded; the second input end of the first signal separation circuit is connected to the first reference voltage, and the output end is used to connect the vehicle-mounted electronic equipment; the second input end of the second signal separation circuit is connected to the second reference voltage, and the output end is used to connect the vehicle-mounted electronic equipment. The signal superposition circuit also includes a first diode and a second diode; the anode of the first diode is connected to the left turn signal line, and the cathode is connected to the first end of the second voltage divider resistor; the anode of the second diode is connected to the right turn signal line, and the cathode is connected to the first end of the second voltage divider resistor.

[0089] The multi-signal processing circuit also includes an input filtering circuit and an output filtering circuit;

[0090] The input end of the input filter circuit is connected to the first end of the second voltage-dividing resistor, and the other end is respectively connected to the first input end of the first signal separation circuit and the first input end of the second signal separation circuit. The first end of the output filter circuit is connected to an external power supply, the second end is grounded, and the third end is connected to the output end of the second signal separation circuit.

[0091] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0092] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A multi-signal processing circuit, characterized in that: It includes a signal superposition circuit, a voltage divider circuit, a first signal separation circuit and a second signal separation circuit; the signal superposition circuit is used to superimpose an ignition signal transmitted by an ignition signal line, a left turn signal transmitted by a left turn signal line and a right turn signal transmitted by a right turn signal line, the voltage divider circuit is used to reduce the voltage value of the ignition signal, and the first signal separation circuit and the second signal separation circuit are used to separate the superimposed ignition signal, the left turn signal and the right turn signal according to different voltages; the signal superposition circuit includes a first voltage divider resistor; the voltage divider circuit includes a second voltage divider resistor; The first end of the first voltage-dividing resistor is used to connect the ignition signal line, and the second end is used to connect the left turn signal line, the right turn signal line, the first end of the second voltage-dividing resistor, the first input end of the first signal separation circuit and the first input end of the second signal separation circuit respectively; the second end of the second voltage-dividing resistor is grounded; the second input end of the first signal separation circuit is connected to the first reference voltage, and the output end is used to connect the on-board electronic equipment; the second input end of the second signal separation circuit is connected to the second reference voltage, and the output end is used to connect the on-board electronic equipment.

2. The multi-signal processing circuit according to claim 1, characterized in that: The signal superposition circuit also includes a first diode and a second diode; The anode of the first diode is connected to the left turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor; the anode of the second diode is connected to the right turn signal line, and the cathode is connected to the first end of the second voltage-dividing resistor.

3. The multi-signal processing circuit according to claim 1, characterized in that: The first signal separation circuit includes a first comparator; The first input end of the first comparator is respectively connected to the first end of the second voltage-dividing resistor and the output end of the signal superposition circuit, the second input end is connected to the first reference voltage, and the output end is used to connect to the vehicle-mounted electronic device.

4. The multi-signal processing circuit according to claim 3, characterized in that: The second signal separation circuit includes a second comparator; The first input end of the second comparator is respectively connected to the first end of the second voltage-dividing resistor and the output end of the signal superposition circuit, the second input end is connected to the second reference voltage, and the output end is used to connect to the vehicle-mounted electronic device.

5. The multi-signal processing circuit according to claim 4, characterized in that: The first input terminal of the first comparator is a non-inverting input terminal, and the second input terminal is an inverting input terminal; The first input terminal of the second comparator is a non-inverting input terminal, and the second input terminal is an inverting input terminal.

6. The multi-signal processing circuit according to claim 1, characterized in that: Also included is an input filter circuit; The input end of the input filter circuit is connected to the first end of the second voltage-dividing resistor, and the other end is respectively connected to the first input end of the first signal separation circuit and the first input end of the second signal separation circuit.

7. The multi-signal processing circuit according to claim 6, characterized in that: The input filter circuit includes an input filter resistor and an input filter capacitor; One end of the input filter resistor is connected to the first end of the second voltage-dividing resistor, and the other end is respectively connected to the first input end of the first signal separation circuit, the first input end of the second signal separation circuit and one end of the input filter capacitor; the other end of the input filter capacitor is grounded.

8. The multi-signal processing circuit according to claim 4, characterized in that: Also includes an output filter circuit; The output filter circuit has a first end connected to an external power supply, a second end connected to ground, and a third end connected to an output end of the second signal separation circuit.

9. The multi-signal processing circuit according to claim 8, characterized in that: The output filter circuit includes an output filter resistor and an output filter capacitor; One end of the output filter resistor is connected to the output end of the second comparator, and the other end is connected to the external power supply; one end of the output filter capacitor is connected to the output end of the second comparator, and the other end is grounded.

10. An automobile, characterized in that: The method comprises the multi-signal processing circuit as claimed in any one of claims 1 to 9.

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