Shifter circuit and shifter

Abstract

The invention provides a shifter circuit, which comprises an infrared transmitting unit, an infrared receiving unit, an M signal output unit, an M+ signal output unit and an M‑ signal output unit, wherein the infrared transmitting unit is used for transmitting an infrared signal; the infrared receiving unit is used for receiving the infrared signal transmitted by the infrared transmitting unit; the M signal output unit is used for outputting an M signal to realize manual gear control of an automobile; the M+ signal output unit is used for outputting an M+ signal, which cooperates with the M signal to realize manual upshifting of the automobile; the M‑ signal output unit is used for outputting an M‑ signal, which cooperates with the M signal to realize manual downshifting of the automobile, and solves the problem that when an existing manual-automatic shifter realizes the output of M, M+ and M‑ signals through a switch Hall chip, there is no signal output or the signal output is wrong. Through an infrared transmitting head and two infrared receiving heads, the logical output of M, M+ and M‑ signals is realized, and the signal output is accurate and has little influence on it by electromagnetic interference and structural error.

Description

Technical Field

[0001] The invention relates to the technical field of automobile control, and in particular to a shifter circuit based on an infrared light sensor. Background Art

[0002] In the manual-automatic shifters currently on the market, the output of the three signals M, M+, and M- is generally achieved through a switch Hall chip. The switch Hall chip has high requirements on the accuracy of the Hall's magnetic field, position, and structure, which can easily lead to no signal output or signal output errors. Summary of the invention

[0003] A shifter circuit disclosed in the present invention solves the problem that when the existing manual-automatic shifter realizes the M, M+ and M- signal outputs through the switch Hall chip, there is no signal output or the signal output is wrong. Through an infrared transmitter and two infrared receivers, the logical output of M, M+ and M- signals is realized, the signal output is accurate and has little influence on it from electromagnetic interference and structural errors.

[0004] To achieve the above object, the technical solution of the present invention is specifically implemented as follows:

[0005] On one hand, the present invention discloses a shifter circuit, comprising an infrared transmitting unit, an infrared receiving unit, an M signal output unit, an M+ signal output unit and an M- signal output unit, wherein the infrared transmitting unit is used to transmit an infrared signal; the infrared receiving unit is used to receive the infrared signal transmitted by the infrared transmitting unit; the M signal output unit is used to output an M signal to realize manual gear control of an automobile; the M+ signal output unit is used to output an M+ signal, which cooperates with the M signal to realize manual upshifting of the automobile; and the M- signal output unit is used to output an M- signal, which cooperates with the M signal to realize manual downshifting of the automobile.

[0006] Furthermore, in the infrared emitting unit, the cathode of the infrared emitting head is grounded, and the anode of the infrared emitting head is connected to the power supply VCC terminal through parallel resistors R1, R2 and R3.

[0007] Furthermore, the infrared receiving unit includes a first infrared receiving head Q1 and a second infrared receiving head Q2, the light receiving surface of the first infrared receiving head Q1 is used to receive the infrared signal emitted by the infrared transmitting unit, the emitter of the first infrared receiving head Q1 is grounded, and the collector of the first infrared receiving head Q1 is connected to the power supply VCC end via a resistor R4, and at the same time, the collector of the first infrared receiving head Q1 is grounded via a capacitor C1, and the Sensor_M+ end is set between the resistor R4 and the capacitor C1; the light receiving surface of the second infrared receiving head is used to receive the infrared signal emitted by the infrared transmitting unit, the emitter of the second infrared receiving head Q2 is grounded, and the collector of the second infrared receiving head Q2 is connected to the power supply VCC end via a resistor R5, and at the same time, the collector of the second infrared receiving head Q2 is grounded via a capacitor C2, and the Sensor_M- end is set between the resistor R5 and the capacitor C2.

[0008] Further, in the M signal output unit, the Sensor_M+ terminal in the infrared receiving unit is connected to the first pin of the OR gate D9, the Sensor_M- terminal in the infrared receiving unit is connected to the second pin of the OR gate D9, the third pin of the OR gate is connected to the base of the first transistor Q5, the emitter of the first transistor Q5 is grounded, the collector of the first transistor Q5 is grounded via the fuse F3 and the capacitor C9, the base of the first transistor Q5 is grounded via the capacitor C10, and at the same time, the base of the first transistor Q5 is grounded via the resistor R7, and the M signal output terminal M_Output is set between the fuse F3 and the capacitor C9.

[0009] Further, in the M+ signal output unit, the base of the second transistor Q7 is connected to the Sensor_M- terminal via the resistor R12, and the base of the second transistor Q7 is connected to the cathode of the first diode D6, the collector of the second transistor Q7 is grounded via the resistor R14, the emitter of the second transistor Q7 is connected to the Sensor_M+ terminal, the base of the third transistor Q3 is grounded via the capacitor C11, the emitter of the third transistor Q3 is grounded, and the collector of the third transistor Q3 is grounded via the fuse F1 and the capacitor C3, and the output terminal M+_Output of the M+ signal is set between the fuse F1 and the capacitor C3.

[0010] Further, in the M-signal output unit, the base of the fifth transistor Q6 is connected to the Sensor_M+ terminal via the resistor R11, and the base of the fifth transistor Q6 is connected to the cathode of the second diode D2, the collector of the fifth transistor Q6 is grounded via the resistor R13, the emitter of the fifth transistor Q6 is connected to the Sensor_M- terminal, the base of the fourth transistor Q4 is grounded via the capacitor C12, the emitter of the fourth transistor Q4 is grounded, the collector of the fourth transistor Q4 is grounded via the fuse F2 and the capacitor C4, and the output terminal M-_Output of the M-signal is set between the fuse F2 and the capacitor C4.

[0011] Furthermore, the infrared transmitter model is SFH4244.

[0012] Furthermore, the models of the first receiving head and the second receiving head are SFH325.

[0013] Another aspect of the present invention discloses a shifter, comprising any one of the shifter circuits described above.

[0014] Beneficial technical effects:

[0015] 1. The present invention discloses a shifter circuit, comprising an infrared transmitting unit, an infrared receiving unit, an M signal output unit, an M+ signal output unit and an M- signal output unit, wherein the infrared transmitting unit is used to transmit an infrared signal; the infrared receiving unit is used to receive the infrared signal transmitted by the infrared transmitting unit; the M signal output unit is used to output an M signal to realize manual gear control of an automobile; the M+ signal output unit is used to output an M+ signal, which cooperates with the M signal to realize manual gear upshifting of the automobile; the M- signal output unit is used to output an M- signal, which cooperates with the M signal to realize manual gear downshifting of the automobile, and solves the problem that when the existing manual-automatic shifter realizes the output of M, M+ and M- signals through a switch Hall chip, there is a problem that there is no signal output or a signal output error easily occurs. Through an infrared transmitting head and two infrared receiving heads, the logical output of M, M+ and M- signals is realized, and the signal output is accurate and has little influence on it by electromagnetic interference and structural error;

[0016] 2. The present invention adopts one infrared transmitting head and two infrared receiving heads to realize the output of M signal, M+ signal and M- signal, the circuit structure is simple, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0018] Figure 1 A specific circuit structure diagram of an infrared emission unit in a shifter circuit according to the present invention;

[0019] Figure 2 A specific circuit structure diagram of an infrared receiving unit in a shifter circuit according to the present invention;

[0020] Figure 3 A specific circuit structure diagram of an M signal output unit in a shifter circuit according to the present invention;

[0021] Figure 4 A specific circuit structure diagram of an M+ signal output unit in a shifter circuit according to the present invention;

[0022] Figure 5 The present invention provides a specific circuit structure diagram of an M-signal output unit in a shifter circuit. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] First of all, it should be noted that in order to avoid crossing of the lines in the circuit structure diagram, this application adopts the form of marking, and the same marking symbol represents the same connection point.

[0026] In one aspect, the present invention discloses a shifter circuit. Figure 1-5 The shifter circuit includes an infrared transmitting unit, an infrared receiving unit, an M signal output unit, an M+ signal output unit and an M- signal output unit, wherein the infrared transmitting unit is used to transmit an infrared signal; the infrared receiving unit is used to receive the infrared signal transmitted by the infrared transmitting unit; the M signal output unit is used to output an M signal to realize manual gear control of the automobile; the M+ signal output unit is used to output an M+ signal, which cooperates with the M signal to realize manual gear upshift of the automobile; the M- signal output unit is used to output an M- signal, which cooperates with the M signal to realize manual gear downshift of the automobile, and solves the problem that when the existing manual-automatic shifter realizes the output of M, M+ and M- signals through a switch Hall chip, there is a problem that there is no signal output or a signal output error easily occurs. Through an infrared transmitting head and two infrared receiving heads, the logical output of M, M+ and M- signals is realized, and the signal output is accurate and has little influence on it by electromagnetic interference and structural errors.

[0027] As an embodiment of the present invention, the infrared emitting unit includes an infrared emitting head for emitting infrared signals. The cathode of the infrared emitting head is grounded, and the anode of the infrared emitting head is connected to the power supply VCC terminal through parallel resistors R1, R2 and R3. The resistors R1, R2 and R3 provide current for the infrared emitting head. Preferably, the infrared emitting head selects SFH4244 or SFH4255.

[0028] As an embodiment of the present invention, the infrared receiving unit includes two infrared receiving heads, a first infrared receiving head Q1 and a second infrared receiving head Q2. Preferably, the infrared receiving head selects SFH325, the light receiving surface of the first infrared receiving head Q1 is used to receive the infrared signal emitted by the infrared transmitting unit, the emitter of the first infrared receiving head Q1 is grounded, and the collector of the first infrared receiving head Q1 is connected to the power supply VCC end via a resistor R4. At the same time, the collector of the first infrared receiving head Q1 is grounded via a capacitor C1, and the Sensor_M+ end is set between the resistor R4 and the capacitor C1; the light receiving surface of the second infrared receiving head is used to receive the infrared signal emitted by the infrared transmitting unit, the emitter of the second infrared receiving head Q2 is grounded, and the collector of the second infrared receiving head Q2 is connected to the power supply VCC end via a resistor R5. At the same time, the collector of the second infrared receiving head Q2 is grounded via a capacitor C2, and the Sensor_M- end is set between the resistor R5 and the capacitor C2.

[0029] As an embodiment of the present invention, the M signal output unit includes an OR gate circuit D9 composed of two diodes connected in parallel, the Sensor_M+ terminal in the infrared receiving unit is connected to the first pin of the OR gate D9, the Sensor_M- terminal in the infrared receiving unit is connected to the second pin of the OR gate D9, the third pin of the OR gate is connected to the base of the first transistor Q5, the emitter of the first transistor Q5 is grounded, the collector of the first transistor Q5 is grounded via the fuse F3 and the capacitor C9, the base of the first transistor Q5 is grounded via the capacitor C10, and at the same time, the base of the first transistor Q5 is grounded via the resistor R7, and the M signal output terminal M_Output is set between the fuse F3 and the capacitor C9.

[0030] As an embodiment of the present invention, in the M+ signal output unit, the base of the second transistor Q7 is connected to the Sensor_M- terminal via the resistor R12, and the base of the second transistor Q7 is connected to the cathode of the first diode D6, the collector of the second transistor Q7 is grounded via the resistor R14, the emitter of the second transistor Q7 is connected to the Sensor_M+ terminal, the base of the third transistor Q3 is grounded via the capacitor C11, the emitter of the third transistor Q3 is grounded, and the collector of the third transistor Q3 is grounded via the fuse F1 and the capacitor C3, and the output terminal M+_Output of the M+ signal is set between the fuse F1 and the capacitor C3, the resistor R12 provides the base current for the second transistor Q7, so that the second transistor Q7 is in a switching state, the resistor R14 ensures that there is no leakage current output when the second transistor Q7 is turned off, and F1 is a recoverable fuse to avoid external short circuit causing the third transistor Q3 to burn out.

[0031] As an embodiment of the present invention, in the M-signal output unit, the base of the fifth transistor Q6 is connected to the Sensor_M+ terminal via a resistor R11, and the base of the fifth transistor Q6 is connected to the cathode of the second diode D2, the collector of the fifth transistor Q6 is grounded via a resistor R13, the emitter of the fifth transistor Q6 is connected to the Sensor_M- terminal, the base of the fourth transistor Q4 is grounded via a capacitor C12, the emitter of the fourth transistor Q4 is grounded, the collector of the fourth transistor Q4 is grounded via a fuse F2 and a capacitor C4, and the output terminal M-_Output of the M-signal is set between the fuse F2 and the capacitor C4, the resistor R11 provides a base current for the fifth transistor Q6, so that the fifth transistor Q6 is in a switching state, the resistor R13 ensures that there is no leakage current output when the fifth transistor Q6 is turned off, and F2 is a recoverable fuse to avoid external short circuit causing the fourth transistor Q4 to burn out.

[0032] The above shifter circuit is further explained below in combination with the working principle:

[0033] The gear position signal of a gear shifter circuit of the present invention is low level effective.

[0034] The infrared transmitting head in the infrared transmitting unit transmits an infrared signal, and the first infrared receiving head and the second infrared receiving head in the infrared receiving unit receive the infrared signal transmitted by the infrared transmitting head. When the infrared signal transmitted by the infrared transmitting head is blocked and the first infrared receiving head and the second infrared receiving head do not receive the infrared signal, the collector and the emitter of the first infrared receiving head Q1 and the second infrared receiving head Q2 are cut off, and the Sensor_M+ end is connected to the VCC end through the resistor R4, which is a high level; the Sensor_M- end is connected to the VCC end through the resistor R5, which is also a high level; when the infrared signal transmitted by the infrared transmitting head is not blocked, the light receiving surfaces of the first infrared receiving head Q1 and the second infrared receiving head Q2 receive the infrared signal, causing the collector and the emitter of the first infrared receiving head Q1 and the second infrared receiving head Q2 to be turned on, the Sensor_M+ end becomes a low level, and the Sensor_M- end also becomes a low level.

[0035] In the M signal output unit, there is an OR gate circuit D9 composed of two diodes connected in parallel, and the OR gate circuit D9 has two input terminals and one output terminal, wherein the first input terminal is connected to the Sensor_M+ terminal, and the second input terminal is connected to the Sensor_M- terminal. When any one of the first infrared receiving head Q1 and the second infrared receiving head Q2 is blocked, that is, when one of the Sensor_M+ terminal and the Sensor_M- terminal is at a high level, the output terminal of the OR gate circuit D9 outputs a high level, causing the Vbe voltage of the first NPN transistor Q5 to be greater than the threshold voltage of the transistor conduction, the first transistor Q5 is turned on, and the output terminal M_Output of the M signal outputs a low level.

[0036] When the first infrared receiving head Q1 does not receive an infrared signal and the second receiving head Q2 receives an infrared signal, that is, the Sensor_M+ terminal is at a high level and the Sensor_M- terminal is at a low level, the Veb voltage of the second transistor Q7 is greater than the threshold voltage for the PNP transistor to be turned on, and the second transistor Q7 is turned on, resulting in the voltage of the base of the third transistor Q3 being greater than the voltage of the emitter of the third transistor Q3, and the third transistor Q3 is also turned on, and the M+ signal output terminal M+_Output outputs the M+ signal, which is at a low level; the Veb voltage of the fifth transistor Q6 is less than the threshold voltage for the PNP transistor to be turned on, and the fifth transistor Q6 is turned off, resulting in the Vbe voltage of the fourth transistor Q4 being less than the threshold voltage for the NPN transistor to be turned on, so the fourth transistor Q4 is also turned off, and the output terminal M-_Output of the M- signal outputs a high level signal.

[0037] When the first infrared receiving head Q1 receives an infrared signal and the second receiving head Q2 does not receive an infrared signal, that is, the Sensor_M+ terminal is at a low level and the Sensor_M- terminal is at a high level, the Veb voltage of the second transistor Q7 is less than the threshold voltage for the PNP transistor to be turned on, and the second transistor Q7 is turned off, resulting in the Vbe voltage of the third transistor Q3 being less than the threshold voltage for the NPN transistor to be turned on, and the third transistor is also in a cut-off state, and the M+ signal output terminal M+_Output outputs a high-level signal; the Veb voltage of the fifth transistor Q6 is greater than the threshold voltage for the PNP transistor to be turned on, and the fifth transistor Q6 is turned on, resulting in the Vbe voltage of the fourth transistor Q4 being greater than the threshold voltage for the NPN transistor to be turned on, and the fourth transistor Q4 is also turned on, and the M- signal output terminal M-_Output outputs a low-level signal.

[0038] The output states of the M, M+ and M- signals when the first infrared receiving head Q1 and the second infrared receiving head Q2 are in different states are shown in Table 1.

[0039] Table 1:

[0040] The first infrared receiving head Q1 Deadline Conductivity Conductivity Deadline The second infrared receiving head Q2 Conductivity Conductivity Deadline Deadline M Low level High level Low level Low level M+ Low level High level High level High level M- High level High level Low level High level

[0041] Another aspect of the present invention discloses a shifter, which includes the shifter circuit as described above.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0043] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A shifter circuit, characterized in that: include: An infrared transmitting unit, used for transmitting infrared signals; An infrared receiving unit, used for receiving the infrared signal emitted by the infrared emitting unit; M signal output unit, used to output M signal to realize manual gear control of the car; An M+ signal output unit, used to output an M+ signal, which cooperates with the M signal to realize manual shifting of the vehicle; An M-signal output unit, used to output an M-signal, and cooperate with the M signal to realize manual downshifting of the vehicle; In the infrared emitting unit, the cathode of the infrared emitting head is grounded, and the anode of the infrared emitting head is connected to the power supply VCC terminal through parallel resistors R1, R2 and R3; The infrared receiving unit includes a first infrared receiving head Q1 and a second infrared receiving head Q2, wherein the light receiving surface of the first infrared receiving head Q1 is used to receive the infrared signal emitted by the infrared emitting unit, the emitter of the first infrared receiving head Q1 is grounded, and the collector of the first infrared receiving head Q1 is connected to the power supply VCC end via a resistor R4, and at the same time, the collector of the first infrared receiving head Q1 is grounded via a capacitor C1, and a Sensor_M+ end is set between the resistor R4 and the capacitor C1; the light receiving surface of the second infrared receiving head is used to receive the infrared signal emitted by the infrared emitting unit, the emitter of the second infrared receiving head Q2 is grounded, and the collector of the second infrared receiving head Q2 is connected to the power supply VCC end via a resistor R5, and at the same time, the collector of the second infrared receiving head Q2 is grounded via a capacitor C2, and a Sensor_M- end is set between the resistor R5 and the capacitor C2; In the M signal output unit, the Sensor_M+ terminal in the infrared receiving unit is connected to the first pin of the OR gate D9, the Sensor_M- terminal in the infrared receiving unit is connected to the second pin of the OR gate D9, the third pin of the OR gate is connected to the base of the first transistor Q5, the emitter of the first transistor Q5 is grounded, the collector of the first transistor Q5 is grounded via the fuse F3 and the capacitor C9, the base of the first transistor Q5 is grounded via the capacitor C10, and at the same time, the base of the first transistor Q5 is grounded via the resistor R7, and the fuse F3 and the capacitor C9 are set as the M signal output terminal M_Output; In the M+ signal output unit, the base of the second transistor Q7 is connected to the Sensor_M- terminal via the resistor R12, and the base of the second transistor Q7 is connected to the cathode of the first diode D6, the collector of the second transistor Q7 is grounded via the resistor R14, the emitter of the second transistor Q7 is connected to the Sensor_M+ terminal, the base of the third transistor Q3 is grounded via the capacitor C11, the emitter of the third transistor Q3 is grounded, the collector of the third transistor Q3 is grounded via the fuse F1 and the capacitor C3, and the output terminal M+_Output of the M+ signal is set between the fuse F1 and the capacitor C3; In the M-signal output unit, the base of the fifth transistor Q6 is connected to the Sensor_M+ terminal via the resistor R11, and the base of the fifth transistor Q6 is connected to the cathode of the second diode D2, the collector of the fifth transistor Q6 is grounded via the resistor R13, the emitter of the fifth transistor Q6 is connected to the Sensor_M- terminal, the base of the fourth transistor Q4 is grounded via the capacitor C12, the emitter of the fourth transistor Q4 is grounded, the collector of the fourth transistor Q4 is grounded via the fuse F2 and the capacitor C4, and the output terminal M-_Output of the M-signal is set between the fuse F2 and the capacitor C4.

2. A gear shifter, characterized in that: Comprising the shifter circuit as claimed in claim 1.

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