Electrical circuit of automobile switch

Abstract

The present application provides an electrical circuit of an automobile switch. The electrical circuit includes: a first resistor R1, a second resistor R2, a third resistor R3 and a micro switch group to be tested; the second resistor R2 is connected in series with the micro switch group to be tested, and then connected in parallel with the third resistor R3; the first resistor R1 is connected in series with the above parallel structure. The electrical circuit of the automobile switch provided by the present application increases the comprehensiveness of the diagnostic scheme and improves the electrical circuit safety performance of the automobile switch circuit.

Description

Technical Field

[0001] The present application relates to the field of automotive electronic technology, and in particular to an electrical circuit of an automotive switch. Background Art

[0002] With the rapid development of automobile technology, the requirements for functional safety of automobile switches are becoming more and more common, especially the design of switches related to the personal safety of drivers and passengers is particularly important. At present, the switch design usually adopts a single contact on-off form. By pressing the button, the mechanical structure pushes the micro switch to conduct and close the circuit, thereby transmitting a low-level or high-level signal to the controller. Figure 1 , the controller diagnosis for the corresponding switch design usually only has short-circuit diagnosis, that is, the detection switch is in the on state for a long time T0, that is, the circuit is on and the diagnostic circuit resistance is R1+R2, and the duration is greater than the set threshold T0, the diagnostic alarm is triggered. However, if the line from the switch to the controller fails and causes the circuit to be open, the controller will think that the switch is always in the unpressed state because there is no difference from the circuit resistance state of the micro switch being pressed. At this time, even if the switch is operated, the controller will not respond and will not report an error. It is impossible to complete the diagnosis of the open circuit condition. Utility Model Content

[0003] The purpose of this application is to provide an electrical circuit of an automobile switch, which can solve at least one of the above-mentioned technical problems. The specific solution is as follows:

[0004] According to a specific implementation of the present application, the present application provides an electrical circuit of an automobile switch, comprising: a first resistor R1, a second resistor R2, a third resistor R3 and a microswitch group to be measured; the second resistor R2 is connected in series with the microswitch group to be measured and then connected in parallel with the third resistor R3; the first resistor R1 is connected in series with the above-mentioned parallel structure.

[0005] Optionally, the resistance value of the first resistor R1 is 0.

[0006] Optionally, the resistance value of the second resistor R2 is designed according to the driving capability of the controller pin.

[0007] Optionally, the resistance value of the second resistor R2 is less than 300Ω.

[0008] Optionally, the resistance value of the third resistor R3 is ≥10*R2.

[0009] Optionally, the micro switch group to be tested includes: a single micro switch SW.

[0010] Optionally, the contact resistance of the micro switch SW contact is 0 by default.

[0011] Optionally, the micro switch group to be tested includes: a group of micro switches to be tested that are connected in parallel with each other.

[0012] Optionally, each of the micro switches to be tested that are connected in parallel is connected in series with a voltage-dividing resistor.

[0013] Optionally, the voltage-dividing resistors connected in series with the micro switches to be measured that are connected in parallel have different resistance values.

[0014] Compared with the prior art, the above solution of the embodiment of the present application has at least the following beneficial effects:

[0015] The present application provides an electrical circuit of an automobile switch. The electrical circuit of an automobile switch provided by the present application and its corresponding diagnostic design scheme increase the comprehensiveness of the diagnostic scheme and improve the safety performance of the electrical circuit of the automobile switch circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of an electrical circuit of an automobile switch provided by prior art features is shown;

[0017] Figure 2 The schematic diagram of the electrical circuit of the automobile switch provided in the first embodiment of the present application is shown;

[0018] Figure 3 A flow chart of an electrical circuit diagnosis method for an automobile switch provided in Embodiment 1 of the present application is shown;

[0019] Figure 4 The schematic diagram of the electrical circuit of the automobile switch provided in the second embodiment of the present application is shown;

[0020] Figure 5 A flow chart of an electrical circuit diagnosis method for an automotive switch provided in Embodiment 2 of the present application is shown;

[0021] Figure 6 The schematic diagram of the electrical circuit of the automobile switch provided in the third embodiment of the present application is shown;

[0022] Figure 7 A flow chart of an electrical circuit diagnosis method for an automobile switch provided in Embodiment 3 of the present application is shown;

[0023] Figure 8 The schematic diagram of the automobile switch electrical circuit detection system provided in the fourth embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0025] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0026] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0027] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0028] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0029] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity 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 commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0030] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0031] The optional embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0032] Embodiment 1

[0033] This embodiment provides a circuit diagram of the electrical circuit of the automobile switch. Figure 2 See Figure 2 The electrical circuit of the automobile switch provided in this embodiment includes: a first resistor R1, a second resistor R2, a third resistor R3, and a single micro switch SW.

[0034] In the above electrical circuit, the micro switch SW and the second resistor R2 are connected in series to form a series branch, and then connected in parallel with the third resistor R3.

[0035] After the two branches are connected in parallel, they are connected in series with the first resistor R1, thus forming the electrical circuit of the automotive switch provided by the present application.

[0036] It should be noted that the resistance value of the first resistor R1 is usually 0, and its function is to prevent large current from burning the circuit board.

[0037] The resistance value of the second resistor R2 can be designed according to the driving capability of the controller pin, usually <300Ω. Here, the contact resistance of the micro switch SW contact is set to 0 by default. If the actual selection is not 0, R2 needs to be replaced with R2' during the diagnosis calculation. R2' is the contact resistance R between R2 and the micro switch SW contact. r sum.

[0038] The resistance value of the third resistor R3 is ≥10*R2, and 3.3kΩ is recommended, which has large usage and low cost.

[0039] With the above circuit structure, when the micro switch SW is short-circuited, the resistance value of the circuit detected by the outside world is R1+R2*R3 / (R2+R3), and the above resistance value remains constant.

[0040] When the micro switch is pressed normally, the circuit resistance value detected by the outside world is R1+R2*R3 / (R2+R3), and the resistance value becomes invalid as the micro switch is released.

[0041] When a circuit breaker fault occurs in the circuit structure, the detection switch is not conducting.

[0042] Based on the above principle, the working condition detection of the electrical circuit of the automobile switch can be completed.

[0043] Figure 3 A flow chart showing a method for diagnosing an electrical circuit of an automotive switch. Figure 3 , the electrical circuit diagnosis methods of automotive switches include:

[0044] S31, when the switch and related wiring harness are in normal state, by pressing the button, the mechanical structure pushes the micro switch to turn on and the circuit is closed. The controller diagnostic circuit detects that the switch is in the on state during the time 50ms≤T≤T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+R2*R3 / (R2+R3), and the switch is pressed effectively.

[0045] S32, when a switch and related wiring harness fail and cause a short circuit, the controller diagnostic circuit detects that the switch on time is greater than T0, that is, the circuit is on and the diagnostic circuit resistance is R1+R2*R3 / (R2+R3), triggering a short circuit diagnostic alarm.

[0046] S33, when the switch and related display fail and cause a circuit break, the controller diagnostic circuit detects that the switch is not conducting, that is, the circuit is conducting and the diagnostic circuit resistance approaches infinity, triggering a circuit break diagnostic alarm.

[0047] The utility model provides an automobile switch electrical circuit and diagnostic logic, which enables a controller to determine whether the switch circuit is in a short circuit / open circuit state by identifying different voltage values.

[0048] The utility model provides an automobile switch electrical circuit and a corresponding diagnosis design scheme thereof, which increases the comprehensiveness of the diagnosis scheme and improves the safety performance of the electrical circuit of the automobile switch circuit.

[0049] The utility model constrains the design requirements of the resistance values ​​of R1 / R2 / R3.

[0050] The utility model increases the resistor R3 to design the circuit, and realizes the whole vehicle diagnosis and judgment of the circuit breaking condition with a very low cost solution.

[0051] The automotive switch in the design provided by the utility model can refer not only to a simple micro switch, but also to various systems that connect the entire electrical circuit by moving contact, such as the contact system between the gold sheet and the conductive rubber contact on the PCB, or the contact system between the gold sheet and the metal spring on the PCB.

[0052] Embodiment 2

[0053] The circuit diagram of the electrical circuit of the automobile switch provided in this embodiment is as follows: Figure 4 See Figure 4 The electrical circuit of the automobile switch provided in this embodiment includes: a first resistor R1, a second resistor R2, a third resistor R3, and a group of micro switches to be tested. The group of micro switches SW1, SW2, SW3, and SW4 are connected in parallel with each other. Moreover, each of the micro switches SW1, SW2, SW3, and SW4 connected in parallel is connected in series with a voltage divider resistor.

[0054] Specifically, the micro switch SW1 is connected in series with the fourth resistor R4. The micro switch SW2 is connected in series with the fifth resistor R5. The micro switch SW3 is connected in series with the sixth resistor R6. The micro switch SW4 is connected in series with the seventh resistor R7. Then, the branches formed by the micro switches and resistors connected in series are connected in parallel to form the micro switch circuit to be tested.

[0055] Compared with the technical solution provided in the first embodiment, the technical solution of the second embodiment of the present application is different in that the micro switch to be tested is a group of micro switches. In order to effectively test the actual working conditions of a group of micro switches, the micro switches to be tested are connected in parallel to each other, so as to distinguish the current working conditions of each micro switch according to the voltage measured on the circuit after power-on.

[0056] After adopting the above circuit structure, different diagnostic methods need to be applied during the diagnosis process.

[0057] Figure 5 The various operation steps of the electrical circuit diagnosis method of the automobile switch provided in this embodiment are shown. Figure 5 , the electrical circuit diagnosis method of the automobile switch includes the following steps:

[0058] S501, when the switch SW1 and the related wiring harness are in normal status, by pressing the button, the mechanical structure pushes the micro switch to turn on and the circuit is closed. The controller diagnostic circuit detects that the switch is in the on state during the time 50ms≤T≤T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R4)*R3 / (R2+R3+R4), and pressing the switch SW1 is effective.

[0059] S502, when the switch SW1 and the related wiring harness fail and cause a short circuit, the controller diagnostic circuit detects that the switch on time is greater than T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R4)*R3 / (R2+R3+R4), triggering a short circuit diagnostic alarm.

[0060] S503, when the switch SW1 and the related display fail and cause a circuit break, the controller diagnostic circuit detects that the switch is not conducting, that is, the circuit is conducting and the diagnostic circuit resistance approaches infinity, triggering a circuit break diagnostic alarm.

[0061] S504, when the switch SW2 and the related wiring harness are in normal status, by pressing the button, the mechanical structure pushes the micro switch to turn on and the circuit is closed. The controller diagnostic circuit detects that the switch is in the on state during the time 50ms≤T≤T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R5)*R3 / (R2+R3+R5), and pressing the switch SW2 is effective.

[0062] S505, when the switch SW2 and the related wiring harness fail and cause a short circuit, the controller diagnostic circuit detects that the switch on time is greater than T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R5)*R3 / (R2+R3+R5), triggering a short circuit diagnostic alarm.

[0063] S506, when the switch SW2 and the related display fail and cause a circuit break, the controller diagnostic circuit detects that the switch is not conducting, that is, the circuit is conducting and the diagnostic circuit resistance approaches infinity, triggering a circuit break diagnostic alarm.

[0064] S507, when the switch SW3 and the related wiring harness are in normal condition, by pressing the button, the mechanical structure pushes the micro switch to turn on and the circuit is closed. The controller diagnostic circuit detects that the switch is in the on state during the time 50ms≤T≤T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R6)*R3 / (R2+R3+R6), and pressing the switch SW3 is effective.

[0065] S508, when the switch SW3 and the related wiring harness fail and cause a short circuit, the controller diagnostic circuit detects that the switch on time is greater than T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R6)*R3 / (R2+R3+R6), triggering a short circuit diagnostic alarm.

[0066] S509, when the switch SW3 and the related display fail and cause a circuit break, the controller diagnostic circuit detects that the switch is not conducting, that is, the circuit is conducting and the diagnostic circuit resistance approaches infinity, triggering a circuit break diagnostic alarm.

[0067] S510, when the switch SW4 and the related wiring harness are in normal status, by pressing the button, the mechanical structure pushes the micro switch to turn on and the circuit is closed. The controller diagnostic circuit detects that the switch is in the on state during the time 50ms≤T≤T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R7)*R3 / (R2+R3+R7), and pressing the switch SW4 is effective.

[0068] S511, when the switch SW4 and the related wiring harness fail and cause a short circuit, the controller diagnostic circuit detects that the switch on time is greater than T0, that is, the circuit is turned on and the diagnostic circuit resistance is R1+(R2+R7)*R3 / (R2+R3+R7), triggering a short circuit diagnostic alarm.

[0069] S512, when the switch SW4 and the related display fail and cause a circuit break, the controller diagnostic circuit detects that the switch is not conducting, that is, the circuit is conducting and the diagnostic circuit resistance approaches infinity, triggering a circuit break diagnostic alarm.

[0070] Embodiment 3

[0071] The circuit diagram of the electrical circuit of the automobile switch provided in this embodiment is as follows: Figure 6 See Figure 6 The electrical circuit of the automobile switch provided in this embodiment includes: a first resistor R1, a second resistor R2, a third resistor R3, and a group of micro switches to be tested. The group of micro switches includes a first micro switch SW1, a second micro switch SW2, and so on to the Nth micro switch SW N The connection relationship between the micro switches in this group is that they are connected in parallel. Moreover, each of the micro switches in this group connected in parallel is connected in series with a voltage dividing resistor.

[0072] Specifically, the first micro switch SW1 is connected in series with the fourth resistor R4. The second micro switch SW2 is connected in series with the fifth resistor R5. And so on. N With the N+3 resistor R (N+3) Then, the branches formed by the micro switch and the resistor being connected in series are connected in parallel to form a micro switch circuit to be tested.

[0073] Compared with the technical solution provided in the second embodiment, the technical solution of the third embodiment of the present application is different in that the number of micro switches to be tested is N. In order to effectively test the actual working conditions of a group of micro switches, the micro switches to be tested are connected in parallel to distinguish the current working conditions of each micro switch according to the voltage measured on the circuit after power-on.

[0074] After adopting the above circuit structure, different diagnostic methods need to be applied during the diagnosis process.

[0075] Figure 7 The various operation steps of the electrical circuit diagnosis method of the automobile switch provided in this embodiment are shown. Figure 7 , the electrical circuit diagnosis method of the automobile switch includes the following steps:

[0076] S701, when the switch SW n When the state of the related wiring harness is normal, by pressing the button, the mechanical structure pushes the micro switch to conduct and the circuit is closed. The controller diagnostic circuit detection switch is in the conducting state within the time 50ms≤T≤T0, that is, the circuit is conducted and the diagnostic circuit resistance is R1+(R2+R (n+3) )*R3 / (R2+R3+R (n+3) ), switch SW n Pressing works.

[0077] S702, when the switch SW1 and the related wiring harness fail and cause a short circuit, the controller diagnostic circuit detects that the switch conduction time is greater than T0, that is, the circuit is conducted and the diagnostic circuit resistance is R1+(R2+R (n+3) )*R3 / (R2+R3+R (n+3)), triggering a short-circuit diagnostic alarm.

[0078] S703, when the switch SW1 and the related display fail and cause a circuit break, the controller diagnostic circuit detects that the switch is not conducting, that is, the circuit is conducting and the diagnostic circuit resistance approaches infinity, triggering a circuit break diagnostic alarm.

[0079] Wherein, n represents any natural number from 1 to N.

[0080] Embodiment 4

[0081] Figure 8 The utility model shows the automobile switch electrical circuit detection system provided by the present invention. Figure 8 The automobile switch electrical circuit detection system includes: a controller diagnostic circuit 81, and an automobile switch electrical circuit 82.

[0082] The electrical circuit 82 of the automobile switch is the object to be measured, and the controller diagnosis circuit 81 is the main circuit for performing diagnosis. During the diagnosis process, the controller diagnosis circuit 81 is connected across the two ends of the electrical circuit 82 of the automobile switch to perform fault diagnosis on the electrical circuit 82 of the automobile switch.

[0083] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0084] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrical circuit of an automobile switch, characterized in that: include: A first resistor R1, a second resistor R2, a third resistor R3 and a micro switch group to be tested; The second resistor R2 is connected in series with the micro switch group to be tested, and then connected in parallel with the third resistor R3; The first resistor R1 and the parallel structure are connected in series.

2. The electrical circuit according to claim 1, characterized in that: The resistance value of the first resistor R1 is 0.

3. The electrical circuit according to claim 1, characterized in that: The resistance value of the second resistor R2 is designed according to the driving capability of the controller pin.

4. The electrical circuit according to claim 3, characterized in that: The resistance value of the second resistor R2 is less than 300Ω.

5. The electrical circuit according to claim 1, characterized in that: The resistance value of the third resistor R3 is ≥10*R2.

6. The electrical circuit according to claim 1, characterized in that: The micro switch group to be tested includes: a single micro switch SW.

7. The electrical circuit according to claim 6, characterized in that: The contact resistance of the micro switch SW contact is 0 by default.

8. The electrical circuit according to claim 1, characterized in that: The micro switch group to be tested includes: a group of micro switches to be tested which are connected in parallel with each other.

9. The electrical circuit according to claim 8, characterized in that: Each of the micro switches to be tested that are connected in parallel is connected in series with a voltage dividing resistor.

10. The electrical circuit according to claim 9, characterized in that: The voltage-dividing resistors connected in series with the micro switches to be measured that are connected in parallel have different resistance values.

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