Control circuit, device and system for automobile key signals

Abstract

The invention discloses a control circuit, device and system for automobile key signals, and relates to the technical field of automobile electronic control, the control circuit for the automobile key signals comprises a controller, a trigger unit and a switch circuit, the switch circuit is arranged between a storage battery and a load, the trigger unit is connected with the switch circuit, and the switch circuit is connected with the controller. The controller is connected with the trigger unit through double lines, when the controller controls an output signal of the trigger unit to enable the switch circuit to be switched on, if any line in the double lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit to be switched on, and the switch circuit is switched off through the double lines. When any circuit is short-circuited or open-circuited, the trigger unit can still output a signal to maintain conduction of the switching circuit, so that the storage battery supplies power to the load, the situation that an engine stalls accidentally or other control devices are difficult to respond normally is avoided, the reliability of a control system is improved, and the safety of automobile driving is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile electronic control, and in particular to a control circuit, device and system for automobile key signals. Background Art

[0002] With the rapid development of modern automobile technology, the electronic control systems in vehicles are becoming increasingly complex. These systems are not only responsible for the management of the powertrain, but also involve multiple aspects such as safety, comfort and infotainment. As the number of electronic components increases, it becomes particularly important to ensure the accurate transmission of all key signals.

[0003] In the prior art, key signals of automotive electronic control systems, such as ignition lock switch signals and brake signals, are transmitted through a single-wire connection. However, single-wire transmission signals are prone to hardware short circuits or line disconnections, resulting in accidental engine shutdown or difficulty in normal response of other control devices, reducing vehicle safety. Summary of the invention

[0004] The embodiments of the present invention provide a control circuit, device and system for automobile key signals to solve the technical problem in the related art that the key signals of the existing automobile electronic control system are easily transmitted through a single-line connection, which may cause hardware short circuit or line disconnection, resulting in accidental engine shutdown or difficulty in normal response of other control devices, thereby reducing the reliability of the control system.

[0005] In a first aspect, a control circuit for a key automobile signal is provided, comprising:

[0006] Controller, trigger unit, switch circuit;

[0007] The switch circuit is arranged between the battery and the load;

[0008] The trigger unit is connected to the switch circuit;

[0009] The controller is connected to the trigger unit via a dual line;

[0010] When the controller controls the output signal of the trigger unit to turn on the switch circuit, if any one of the two lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit turned on.

[0011] In some embodiments, the trigger unit is an RS trigger, and the controller is connected to the R terminal and the S terminal of the RS trigger. When the controller outputs a high level and a low level to the R terminal and the S terminal of the RS trigger respectively, the first output terminal of the RS trigger outputs a high level to turn on the switch circuit.

[0012] When the S terminal of the RS trigger is short-circuited to the ground or open-circuited, the S terminal of the RS trigger is zero, the R terminal of the RS trigger is zero, and the output state of the RS trigger remains unchanged;

[0013] When the S terminal of the RS trigger is short-circuited to a high level, the S terminal of the RS trigger is one, the R terminal of the RS trigger is zero, and the output state of the RS trigger remains unchanged;

[0014] When the R terminal of the RS trigger is short-circuited to the ground or open-circuited, the R terminal of the RS trigger is zero, the S terminal of the RS trigger is one, and the output state of the RS trigger remains unchanged;

[0015] When the R terminal of the RS trigger is short-circuited to a high level, the R terminal of the RS trigger is 1, the S terminal of the RS trigger is 1, and the output state of the RS trigger is high impedance;

[0016] When the controller outputs a shutdown signal, the S terminal of the RS trigger is zero, and the R terminal of the RS trigger is one, the output state of the RS trigger changes.

[0017] In some embodiments, the switch circuit comprises:

[0018] A first switch unit, wherein the first switch unit is connected to the trigger unit, and the trigger unit controls the first switch unit to be turned on;

[0019] The second switch unit is connected to the first switch unit, and when the first switch unit is turned on, the second switch unit is turned on.

[0020] In some embodiments, the first switch unit includes:

[0021] A first resistor R1, wherein a first end of the first resistor R1 is connected to a first output end of the RS trigger;

[0022] A transistor Q2, wherein the base of the transistor Q2 is connected to the second end of the first resistor R1, the collector of the transistor Q2 is connected to the second switch unit, and the emitter of the transistor Q2 is grounded;

[0023] A second resistor R2, wherein a first end of the second resistor R2 is connected to the base of the transistor Q2, and a second end of the second resistor R2 is grounded;

[0024] A pull-up resistor R0, wherein a first end of the pull-up resistor R0 is connected to a power supply, and a second end of the pull-up resistor R0 is connected to a first end of the first resistor R1, for maintaining an output state of the RS trigger.

[0025] In some embodiments, the second switch unit includes:

[0026] a fourth resistor R4, wherein a first end of the fourth resistor R4 is connected to the collector of the transistor Q2;

[0027] A field effect transistor Q1, wherein the gate of the field effect transistor Q1 is connected to the second end of the fourth resistor R4, the source of the field effect transistor Q1 is connected to the battery, and the drain of the field effect transistor Q1 is connected to the load;

[0028] A third resistor R3, wherein a first end of the third resistor R3 is connected to the source of the field effect transistor Q1, and a second end of the third resistor R3 is connected to the gate of the field effect transistor Q1.

[0029] In some embodiments, the second switch unit further includes:

[0030] A diode D1, wherein the anode of the diode D1 is connected to the battery, and the cathode of the diode D1 is connected to the first end of the third resistor R3 and the source of the field effect transistor Q1.

[0031] In some embodiments, the control circuit of the key automobile signal further includes:

[0032] A feedback circuit is connected to the second switch unit, the load, and the controller respectively, and is used to obtain the conduction state of the first switch unit and the second switch unit and feed back the conduction state to the controller.

[0033] In some embodiments, the feedback circuit includes:

[0034] a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected to the drain of the field effect transistor Q1 and the load;

[0035] A sixth resistor R6, a first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5 and the controller, and a second end of the sixth resistor R6 is grounded.

[0036] In a second aspect, a control device for a key automobile signal is provided, comprising the aforementioned control circuit for the key automobile signal.

[0037] In a third aspect, a control system for a key automobile signal is provided, comprising the aforementioned control device for the key automobile signal.

[0038] The beneficial effects brought about by the technical solution provided by the present invention include:

[0039] An embodiment of the present invention provides a control circuit, device and system for a key signal of an automobile. The control circuit for the key signal of the automobile includes a controller, a trigger unit and a switch circuit. The switch circuit is arranged between a battery and a load. The trigger unit is connected to the switch circuit. The controller is connected to the trigger unit through a dual line. When the controller controls the output signal of the trigger unit to turn on the switch circuit, if any one of the dual lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit turned on. Through the dual-line connection, the trigger unit can still output a signal to maintain the switch circuit turned on when any one of the lines is short-circuited or open-circuited, so that the battery supplies power to the load, thereby avoiding accidental engine shutdown or other control devices having difficulty in responding normally, improving the reliability of the control system, and ensuring the safety of automobile driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 An overall schematic diagram of a control circuit for a key automobile signal provided by an embodiment of the present invention;

[0042] Figure 2 A specific schematic diagram of a control circuit for a key automobile signal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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. 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.

[0044] The embodiments of the present invention provide a control circuit, device and system for automobile key signals, which can solve the technical problem that the key signals of the existing automobile electronic control system are easily transmitted through a single-line connection, which may cause hardware short circuit or line disconnection, resulting in accidental engine shutdown or difficulty in normal response of other control devices, thereby reducing the reliability of the control system.

[0045] Figure 1 A control circuit for a key automobile signal provided by an embodiment of the present invention comprises: a controller, a trigger unit and a switch circuit.

[0046] The switch circuit is arranged between the battery and the load, the trigger unit is connected to the switch circuit, and the controller is connected to the trigger unit through a dual line. When the controller controls the output signal of the trigger unit to turn on the switch circuit, if any one of the dual lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit turned on.

[0047] The control circuit of the key signal of the automobile in the embodiment of the present invention is provided with a controller, a trigger unit, and a switch circuit. The switch circuit is arranged between the battery and the load, the trigger unit is connected to the switch circuit, and the controller is connected to the trigger unit through a dual line. When the controller controls the output signal of the trigger unit to turn on the switch circuit, if any one of the dual lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit to be turned on. Through the dual-line connection, the trigger unit can still output a signal to maintain the switch circuit to be turned on when any one of the lines is short-circuited or open-circuited, thereby avoiding accidental engine shutdown or other control devices having difficulty in responding normally, improving the reliability of the control system, and ensuring the safety of automobile driving.

[0048] As an optional implementation, in an embodiment of the invention, see Figure 1As shown, the trigger unit is an RS trigger U1, and the controller is connected to the R terminal and the S terminal of the RS trigger U1. When the controller outputs a high level and a low level to the R terminal and the S terminal of the RS trigger respectively, the first output terminal of the RS trigger U1 outputs a high level to turn on the switch circuit; when the S terminal of the RS trigger U1 is short-circuited to the ground or open-circuited, the S terminal of the RS trigger U1 is zero, the R terminal of the RS trigger U1 is zero, and the output state of the RS trigger U1 remains unchanged. At this time, the output of the first output terminal of the RS trigger U1 is still a high level, so that the switch circuit is turned on, and the battery can still supply power to the load; when the S terminal of the RS trigger U1 is short-circuited to a high level, the S terminal of the RS trigger U1 is one, the R terminal of the RS trigger U1 is zero, and the output state of the RS trigger remains unchanged. At this time, the output of the first output terminal of the RS trigger U1 is still a high level, so that the switch circuit is turned on, and the battery can still supply power to the load; when the S terminal of the RS trigger U1 is short-circuited to a high level, the S terminal of the RS trigger U1 is one, the R terminal of the RS trigger U1 is zero, and the output state of the RS trigger remains unchanged. At this time, the output of the first output terminal of the RS trigger U1 is still a high level, so that The switch circuit is turned on, and the battery can still supply power to the load; when the R terminal of the RS trigger U1 is short-circuited to the ground or open-circuited, the R terminal of the RS trigger U1 is zero, the S terminal of the RS trigger U1 is one, and the output state of the RS trigger remains unchanged. At this time, the output of the first output terminal of the RS trigger U1 is still high level, so that the switch circuit is turned on, and the battery can still supply power to the load; when the R terminal of the RS trigger U1 is short-circuited to a high level, the R terminal of the RS trigger U1 is one, the S terminal of the RS trigger U1 is one, and the output state of the RS trigger U1 is high impedance; when the controller outputs a shutdown signal, the S terminal of the RS trigger U1 is zero, and the R terminal of the RS trigger U1 is one, the output state of the RS trigger U1 changes, and at this time, the first output terminal of the RS trigger U1 outputs a low level, so that the switch circuit is turned off, and the battery stops supplying power to the load.

[0049] As an optional implementation, in an embodiment of the invention, see Figure 1 and Figure 2 As shown, the switch circuit includes: a first switch unit and a second switch unit, the first switch unit is connected to the trigger unit, the trigger unit controls the first switch unit to be turned on, the second switch unit is connected to the first switch unit, when the first switch unit is turned on, the second switch unit is turned on, when the controller controls the first output terminal of the RS trigger U1 to output a signal of a high level, the first switch unit is turned on to further turn on the second switch unit, and the battery supplies power to the load through the second switch unit, when the controller controls the first output terminal of the RS trigger U1 to output a signal of a low level, the first switch unit is turned off to further turn off the second switch unit, and the battery stops supplying power to the load.

[0050] As an optional implementation, in an embodiment of the invention, see Figure 1 and Figure 2 As shown, the first switch unit includes: a first resistor R1, a transistor Q2, a second resistor R2 and a pull-up resistor R0, the first end of the first resistor R1 is connected to the first output end of the RS trigger, the base of the transistor Q2 is connected to the second end of the first resistor R1, the collector of the transistor Q2 is connected to the second switch unit, the emitter of the transistor Q2 is grounded, the first end of the second resistor R2 is connected to the base of the transistor Q2, the second end of the second resistor R2 is grounded, the first end of the pull-up resistor R0 is connected to a 5V power supply, the second end of the pull-up resistor R0 is connected to the first end of the first resistor R1, and is used to maintain the output state of the RS trigger U1. When the first output end of the RS trigger is input When the first output terminal of the RS trigger outputs a high level, the transistor Q2 is turned on; when the first output terminal of the RS trigger outputs a low level, the transistor Q2 is turned off; when the first output terminal of the RS trigger is high impedance, the 5V voltage of the power supply is output to the base of the transistor Q2 through the pull-up resistor R0 and maintains its base at a high level, so that the transistor Q2 is turned on; the first resistor R1 is a current limiting resistor, which is used to protect the transistor Q2, and the first resistor R1 provides a suitable base current for the transistor Q2. The first resistor R1 and the second resistor R2 form a voltage divider network to provide bias for the transistor Q2. The second resistor R2 prevents the base level of the transistor Q2 from being in a floating state when the base control signal level of the transistor Q2 is invalid.

[0051] As an optional implementation, in an embodiment of the invention, see Figure 1 and Figure 2As shown, the second switch unit includes: a fourth resistor R4, a field effect transistor Q1 and a third resistor R3, the first end of the fourth resistor R4 is connected to the collector of the transistor Q2, the gate of the field effect transistor Q1 is connected to the second end of the fourth resistor R4, the source of the field effect transistor Q1 is connected to the battery, the drain of the field effect transistor Q1 is connected to the load, the first end of the third resistor R3 is connected to the source of the field effect transistor Q1, the second end of the third resistor R3 is connected to the gate of the field effect transistor Q1 When the transistor Q2 is turned on, the gate of the field effect tube Q1 is connected to the ground, the third resistor R3 and the fourth resistor R4 provide current limiting for the source of the field effect tube Q1, and provide voltage bias for the source and gate of the field effect tube Q1, then the field effect tube Q1 is turned on, and the battery supplies power to the load through the field effect tube Q1; when the transistor Q2 is turned off, the gate of the field effect tube Q1 is disconnected from the ground, then the field effect tube Q1 is turned off, and the battery stops supplying power to the load.

[0052] As an optional implementation, in an embodiment of the invention, see Figure 1 and Figure 2 As shown, the second switch unit also includes: a diode D1, the positive electrode of the diode D1 is connected to the battery, the negative electrode of the diode D1 is connected to the first end of the third resistor R3 and the source of the field effect transistor Q1, and the diode D1 has unidirectional conductivity, which can effectively prevent the current of the field effect transistor Q1 from flowing in reverse, thereby protecting the battery.

[0053] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the control circuit of the key automobile signal also includes: a feedback circuit, which is respectively connected to the second switch unit, the load, and the controller, and is used to obtain the conduction state of the first switch unit and the second switch unit and feed back to the controller. When the transistor Q2 and the field effect transistor Q1 are both turned on or off, the feedback circuit collects the voltage signal at the drain end of the field effect transistor Q1 and feeds back to the controller, so that the controller can grasp the conduction or off state of the transistor Q2 and the field effect transistor Q1.

[0054] As an optional implementation, in an embodiment of the invention, see Figure 1As shown, the feedback circuit includes: a fifth resistor R5 and a sixth resistor R6, the first end of the fifth resistor R5 is connected to the drain of the field effect tube Q1 and the load, the first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5 and the controller, the second end of the sixth resistor R6 is grounded, the fifth resistor R5 and the sixth resistor R6 form a voltage divider circuit, which is used to collect the voltage signal at the drain end of the field effect tube Q1 and feed it back to the controller, then the controller knows the conduction status of the transistor Q2 and the field effect tube Q1 according to the feedback voltage signal, so that the controller can perform fault diagnosis and broadcast according to the conduction status.

[0055] An embodiment of the present invention also provides a control device for a key automobile signal, comprising the aforementioned control circuit for the key automobile signal, wherein the control circuit for the key automobile signal comprises a controller, a trigger unit, and a switch circuit, wherein the switch circuit is arranged between a battery and a load, wherein the trigger unit is connected to the switch circuit, and wherein the controller is connected to the trigger unit via a dual line. When the controller controls the output signal of the trigger unit to turn on the switch circuit, if any one of the dual lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit turned on.

[0056] The control device of the key signal of the automobile in the embodiment of the present invention has a control circuit of the key signal of the automobile provided with a controller, a trigger unit, and a switch circuit. The switch circuit is arranged between the battery and the load, the trigger unit is connected to the switch circuit, and the controller is connected to the trigger unit through a dual line. When the controller controls the output signal of the trigger unit to turn on the switch circuit, if any one of the dual lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit turned on. Through the dual-line connection, the trigger unit can still output a signal to maintain the switch circuit turned on when any one of the lines is short-circuited or open-circuited, thereby avoiding accidental engine shutdown or other control devices being difficult to respond normally, improving the reliability of the control system, and ensuring the safety of automobile driving.

[0057] The embodiment of the present invention further provides a control system for a key automobile signal, including the aforementioned control device for a key automobile signal.

[0058] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0059] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0060] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A control circuit for key signals of an automobile, characterized in that: include: Controller, trigger unit, switch circuit; The switch circuit is arranged between the battery and the load; The trigger unit is connected to the switch circuit; The controller is connected to the trigger unit via a dual line; When the controller controls the output signal of the trigger unit to turn on the switch circuit, if any one of the two lines is short-circuited or open-circuited, the trigger unit maintains the switch circuit turned on.

2. The control circuit of automobile key signals according to claim 1, characterized in that: The trigger unit is an RS trigger, and the controller is connected to the R terminal and the S terminal of the RS trigger. When the controller outputs a high level and a low level to the R terminal and the S terminal of the RS trigger respectively, the first output terminal of the RS trigger outputs a high level to turn on the switch circuit; When the S terminal of the RS trigger is short-circuited to the ground or open-circuited, the S terminal of the RS trigger is zero, the R terminal of the RS trigger is zero, and the output state of the RS trigger remains unchanged; When the S terminal of the RS trigger is short-circuited to a high level, the S terminal of the RS trigger is one, the R terminal of the RS trigger is zero, and the output state of the RS trigger remains unchanged; When the R terminal of the RS trigger is short-circuited to the ground or open-circuited, the R terminal of the RS trigger is zero, the S terminal of the RS trigger is one, and the output state of the RS trigger remains unchanged; When the R terminal of the RS trigger is short-circuited to a high level, the R terminal of the RS trigger is 1, the S terminal of the RS trigger is 1, and the output state of the RS trigger is high impedance; When the controller outputs a shutdown signal, the S terminal of the RS trigger is zero, and the R terminal of the RS trigger is one, the output state of the RS trigger changes.

3. The control circuit of automobile key signal according to claim 2, characterized in that: The switch circuit comprises: A first switch unit, wherein the first switch unit is connected to the trigger unit, and the trigger unit controls the first switch unit to be turned on; The second switch unit is connected to the first switch unit, and when the first switch unit is turned on, the second switch unit is turned on.

4. The control circuit of automobile key signal according to claim 3, characterized in that: The first switch unit comprises: A first resistor R1, wherein a first end of the first resistor R1 is connected to a first output end of the RS trigger; A transistor Q2, wherein the base of the transistor Q2 is connected to the second end of the first resistor R1, the collector of the transistor Q2 is connected to the second switch unit, and the emitter of the transistor Q2 is grounded; A second resistor R2, wherein a first end of the second resistor R2 is connected to the base of the transistor Q2, and a second end of the second resistor R2 is grounded; A pull-up resistor R0, wherein a first end of the pull-up resistor R0 is connected to a power supply, and a second end of the pull-up resistor R0 is connected to a first end of the first resistor R1, for maintaining an output state of the RS trigger.

5. The control circuit of automobile key signal according to claim 4, characterized in that: The second switch unit comprises: a fourth resistor R4, wherein a first end of the fourth resistor R4 is connected to the collector of the transistor Q2; A field effect transistor Q1, wherein the gate of the field effect transistor Q1 is connected to the second end of the fourth resistor R4, the source of the field effect transistor Q1 is connected to the battery, and the drain of the field effect transistor Q1 is connected to the load; A third resistor R3, wherein a first end of the third resistor R3 is connected to the source of the field effect transistor Q1, and a second end of the third resistor R3 is connected to the gate of the field effect transistor Q1.

6. The control circuit of automobile key signal according to claim 5, characterized in that: The second switch unit further includes: A diode D1, wherein the anode of the diode D1 is connected to the battery, and the cathode of the diode D1 is connected to the first end of the third resistor R3 and the source of the field effect transistor Q1.

7. The control circuit of automobile key signal according to claim 5, characterized in that: Also includes: A feedback circuit is connected to the second switch unit, the load, and the controller respectively, and is used to obtain the conduction state of the first switch unit and the second switch unit and feed back the conduction state to the controller.

8. The control circuit of automobile key signal according to claim 7, characterized in that: The feedback circuit comprises: a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected to the drain of the field effect transistor Q1 and the load; A sixth resistor R6, a first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5 and the controller, and a second end of the sixth resistor R6 is grounded.

9. A control device for key signals of an automobile, characterized in that: A control circuit for a key automobile signal comprising any one of claims 1-8.

10. A control system for key signals of an automobile, characterized in that: A control device for automobile key signals comprising the control device of claim 9.

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