CN113665508A

CN113665508A - Automatic start-stop device, vehicle-mounted terminal and commercial vehicle

Info

Publication number: CN113665508A
Application number: CN202110803589.9A
Authority: CN
Inventors: 吴庭波; 卢作帆
Original assignee: Shenzhen Yuwei Information & Technology Development Co ltd
Current assignee: Shenzhen Yuwei Information & Technology Development Co ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2021-11-19
Anticipated expiration: 2041-07-15
Also published as: CN113665508B

Abstract

The application provides a start-stop function circuit, a self-start-stop device and a vehicle-mounted terminal. Wherein, open and stop the functional circuit, include in having the device that opens the function certainly, include: the logic operation unit receives the shutdown request signal, the startup request signal and the shutdown request holding signal, performs logic operation and generates a start-stop intermediate signal; the signal output unit generates a start-stop signal according to the start-stop intermediate signal; the signal feedback unit generates the shutdown request holding signal according to the start-stop signal; and the switch unit is used for switching off/switching on the connection between the first power supply and the main functional unit according to the start-stop signal, wherein the processor comprises a real-time clock component, and the real-time clock component outputs a start-up request signal.

Description

Automatic start-stop device, vehicle-mounted terminal and commercial vehicle

Technical Field

The application belongs to intelligent monitoring equipment of passenger cars, freight cars, muck cars and dangerous goods cars, and particularly relates to a self-starting and stopping device, a vehicle-mounted terminal and a commercial vehicle.

Background

At present, a company organization operating and managing a vehicle needs to remotely monitor position information and a driver state of the vehicle. When a vehicle is in a stopped state, the vehicle operation management means also needs to perform certain monitoring.

After the vehicle engine is turned off, the vehicle-mounted terminal is generally powered by the vehicle battery. If the vehicle is stopped for a long time. The existing vehicle-mounted terminal usually consumes electric energy in a battery of a light automobile. Resulting in a misfire when the vehicle needs to be operated.

Disclosure of Invention

Based on this, this application provides a from opening and stop device includes: the processor outputs a shutdown request signal, and comprises a real-time clock component which outputs a startup request signal; a first power supply to supply power to the processor; and the start-stop function circuit cuts off the connection between the first power supply and the processor after receiving the shutdown request signal, and closes the connection between the first power supply and the processor when receiving the startup request signal, wherein the processor comprises a real-time clock component which outputs the startup request signal.

Optionally, the start-stop function circuit may include: the logic operation unit receives the shutdown request signal, the startup request signal and the shutdown request holding signal, performs logic operation and generates a start-stop intermediate signal; the signal output unit generates a start-stop signal according to the start-stop intermediate signal; the signal feedback unit generates the shutdown request holding signal according to the start-stop signal; and the switch unit cuts off/conducts the connection between the first power supply and the main functional unit according to the start-stop signal.

Optionally, the real-time clock component outputs a pulse signal of one real-time clock cycle as the active high-level power-on request signal or outputs the inactive low-level power-on request signal, and the power-off request signal is active high-level.

Optionally, the signal output unit performs the following logical operations: s_start-shut＝not S_mid(ii) a The signal feedback unit performs the following logical operations: s_hold＝not S_start-shut(ii) a The logical operation unit performs the following logical operations: s_mid＝(S_shut or S_hold)and(not S_start) (ii) a Wherein S is_midFor the start-stop intermediate signal, S_shutIs the shutdown request signal, S_holdHolding a signal for said shutdown request, S_startIs the start-up request signal, S_start-shutThe signal is the start-stop signal; the shutdown request signal and the startup request signal are active at high levels.

Optionally, the logical operation unit includes: the first resistor is connected with the shutdown request signal; a first diode having an anode connected to the first resistor; a second resistor connected between the cathode of the first diode and the signal output unit; a third resistor connected between the signal feedback unit and the second resistor; and a first end and a second end of the first switch tube are respectively connected to the cathode of the first diode and a signal ground, and a control end of the first switch tube is connected to the starting-up request signal.

Optionally, the logical operation unit further includes: a first pull-down resistor connected with the first resistor; the second pull-down resistor is connected with the control end of the first switching tube; the first low-pass filter is connected with the control end of the first switching tube; and the second low-pass filter is connected between the cathode of the first diode and the signal output unit.

Optionally, the signal output unit includes: a second end of the second switching tube is connected with a signal ground, and a first end of the second switching tube is connected with the signal feedback unit; the first current limiting resistor is connected between the logic operation unit and the control end of the second switching tube; the third pull-down resistor is connected with the first current-limiting resistor; the first pull-up resistor is connected between the first end of the second switching tube and a second power supply; a cathode of the second diode is connected with a second end of the second switching tube, and an anode of the second diode is connected with the switching unit; and the second pull-up resistor is connected between the anode of the second diode and the second power supply.

Optionally, the signal feedback unit includes: a first end and a second end of the third switching tube are respectively connected with the second power supply and the logic operation unit; and the second current limiting resistor is connected with the signal output unit and the control end of the third switching tube.

Optionally, the third switching tube is a PNP type triode, and its control terminal is a base, the first terminal is a collector, and the second terminal is a source; the first end of the third switching tube is connected to the second power supply; and the second end of the third switching tube is connected to the logic operation unit.

Optionally, the pulse width of the power-on request signal is 30 μ S.

The application also provides a vehicle-mounted terminal which comprises any one of the self-starting and stopping devices.

The application also provides a commercial vehicle which comprises any one of the vehicle-mounted terminals.

Some embodiments of the present application provide a start-stop function circuit. The start-stop function circuit can be applied to a device with a self-start-stop function. The device with the self-starting and stopping function can be contained in a vehicle-mounted terminal.

The start-stop function circuit may receive a shutdown request signal from the processor. And may initiate a shutdown process based on the shutdown request signal. During shutdown, the processor may run away due to power loss, outputting an unexpected, indeterminate signal at the relevant pin of the shutdown request signal. In order to avoid the influence of this undefined signal on the shutdown process. When the shutdown process is started, the start-stop function circuit provided by the application can utilize a closed-loop circuit formed by the logic operation unit, the signal output unit and the signal feedback unit to lock the start-stop signal into a shutdown state, and can cut off the connection between the first power supply and the main function unit of the device with the self-start-stop function according to the fixed start-stop signal, stop supplying power to the device and enable the device to be shut down.

Meanwhile, when the starting request signal is received, the locking can be released, so that the starting and stopping signal is in a starting state. And the first power supply can be connected with the main functional unit of the device with the self-starting and stopping function according to the fixed starting and stopping signal, so that the device starts to be powered on.

At least one of the logic operation unit, the signal output unit and the signal feedback unit can be realized by adopting a discrete switch tube. The implementation mode is simple in structure and low in cost.

In some embodiments provided by the present application, the switching tube in the signal feedback unit may be a reverse-connected transistor. The reversely connected transistor is equivalent to a transistor with a current gain (beta) of 1. By adopting the method, the open-loop gain of a closed-loop circuit consisting of the logic operation unit, the signal output unit and the signal feedback unit can be reduced. Therefore, the misoperation caused by over sensitivity of the start-stop function circuit is avoided. Therefore, the anti-interference capability of the start-stop function circuit can be improved.

In other embodiments provided herein, a self-start-stop apparatus is provided. The automatic start-stop device can be contained in the vehicle-mounted terminal. The vehicle-mounted terminal can be applied to commercial vehicles. The automatic start-stop device can utilize the start-stop function circuit to realize automatic start-stop. The automatic starting and stopping device can automatically shut down after finishing the preset task. The power supply of the main part in the self-starting and stopping device can be closed. Only the power supply of the RTC functional unit is reserved. Therefore, the energy consumption of the automatic start-stop device can be greatly reduced. After the RTC functional unit is powered off, the RTC functional unit can be powered on according to a power-on request signal sent by the RTC functional unit. And re-executing the preset task when the computer is started. The preset task may be a monitoring task of the target vehicle.

In other embodiments of the present application, a vehicle-mounted terminal is provided. The vehicle-mounted terminal can comprise the self-starting and stopping device. When the target vehicle is in a long-term stop state, the vehicle-mounted terminal can utilize the automatic start-stop device to realize intermittent monitoring on the target vehicle.

The vehicle-mounted terminal can alternately enter a starting state and a shutdown state according to a preset time interval. In the starting state, the vehicle-mounted terminal can scan the preset parameters of the target vehicle to realize the monitoring function. In the shutdown state, the vehicle-mounted terminal can close the energy supply of the main components, and maintain extremely low power consumption. Therefore, the target vehicle can be monitored under the condition of ensuring low power consumption. Under the condition that the target vehicle is parked for a long time, the electric energy prestored in the vehicle battery can not be consumed due to the monitoring action implemented by the vehicle-mounted terminal, and the target vehicle can be prevented from catching fire when being used next time.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.

Fig. 1 shows a schematic diagram of a start-stop function circuit according to an exemplary embodiment of the present application.

Fig. 2 shows a schematic diagram of a logic operation unit of the start-stop function circuit shown in fig. 1.

Fig. 3 shows a schematic diagram of a signal output unit of the start-stop function circuit shown in fig. 1.

Fig. 4 shows a schematic diagram of a signal feedback unit of the start-stop function circuit shown in fig. 1.

Fig. 5 shows a schematic diagram of a switching unit of the start-stop function circuit shown in fig. 1.

Fig. 6 shows a schematic diagram of a second power conversion circuit of the start-stop function circuit shown in fig. 1.

Fig. 7 shows a schematic composition diagram of an automatic start-stop device according to another embodiment of the present application.

Detailed Description

The automatic start-stop device and the vehicle-mounted terminal can be applied to a vehicle provided with the vehicle-mounted monitoring terminal. In practical use, it can be applied to, for example: taxis, muck cars, commercial concrete cars, supervised vehicles, etc.

The vehicle-mounted terminal can monitor the target vehicle. The monitored range may include the position of the target vehicle, whether the doors are open, or other important opening and closing amount information, analog amount information, video/audio information.

When the target vehicle stops, the vehicle-mounted terminal needs to detect whether the target vehicle is stolen or abnormally moved or the like. Therefore, the on-board terminal is required to monitor the aforementioned information of the target vehicle at regular time while the target vehicle is parked. However, if the monitoring process consumes too much power, it may result in premature consumption of the battery power of the light target vehicle. This may result in the monitoring process not being able to continue to operate efficiently; and may result in misfire while the subject vehicle is in use.

Therefore, the vehicle-mounted terminal needs to be internally provided with the self-start-stop device. So that the target vehicle can be monitored periodically. And between the two monitoring, the vehicle-mounted terminal is closed, so that the standby power of the vehicle-mounted terminal can be reduced to the minimum.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1, the start-stop function circuit 1000 may be built inside the target electronic device, so that the target electronic device has a self-start-stop function. The start-stop function circuit 1000 may include: a logic operation unit 11, a signal output unit 12, a signal feedback unit 13 and a switch unit 14. The logic operation unit 11, the signal output unit 12 and the signal feedback unit 13 are connected in a closed loop manner, and are used for processing the self-starting and stopping logic calculation of a target electronic device (not shown). The switch unit 14 can be used for switching on or off according to the start-stop signal S output by the signal output unit 12_start-shutThe disconnection/connection of the first power supply DC24V from/to the main functional unit of the target electronic device is controlled so that the self-start-stop of the target electronic device can be achieved.

On-off signal S_start-shutWhen 0, the switching unit 14 may be driven to cut off the connection between the first power supply DC24V and the power supply input terminal VIN of the main functional unit of the target electronic device, so that the target electronic device is turned off; on-off signal S_start-shutAt 1, the switching unit 14 may be driven to close the connection between the first power supply DC24V and the power supply input terminal VIN of the main functional unit of the target electronic device, so that the target electronic device is turned on.

Sending out a shutdown request signal S at a processor of a target electronic device_shutThe start-stop function circuitry 1000 then initiates a shutdown process to shut off the power supply to the processor. When the power supply of the processor is insufficient, the processor may be in an out-of-control state or an uncertain state, and may not be able to continuously maintain the output of the shutdown request signal S_shut. At this time, the shutdown request hold signal S that may be output by the signal feedback unit 13_holdMaintaining start-stop signal S_start-shutIs 0, so that the target electronic device can be ensured to be successfully shut down.

As shown in FIG. 1, the logic unit 11 can receive a shutdown request signal S_shutA power-on request signal S_startAnd shutdown request hold signal S_holdAnd performing logic operation to generate start-stop intermediate signal S_mid. Wherein, the shutdown request signal S_shutMay be issued by a processor (not shown) of the target electronic device. Starting up request signal S_startMay be provided by a wake-up source (not shown). The wake-up source may be independent of the target electronic device or may be disposed inside the target electronic device. Optionally, the wake-up source may also be disposed inside the processor of the target electronic device.

The signal output unit 12 can be based on the start-stop intermediate signal S_midGenerating a start-stop signal S_start-shut. The signal feedback unit 13 can be based on the start-stop signal S_start-shutGenerating shutdown request holding signal S_hold。

Optionally, a shutdown request signal S_shut1 may indicate that the shutdown request is valid. Starting up request signal S_start1 may indicate that the power-on request is valid. Shutdown request hold signal S_hold1 may denote a shutdown requestIs effective. The high level of each of the above signals represents a logic 1, and the low level represents a logic 0.

Optionally, a shutdown request signal S_shutA power-on request signal S_startAnd shutdown request hold signal S_holdAre all active high signals (i.e., active at 1). Start-stop signal S_start-shutThe power-on state is set at a high level (equal to 1), and the power-off state is set at a low level (equal to 0).

Alternatively, the signal output unit 12 performs the following logical operations:

S_start-shut＝not S_mid (1)

the signal feedback unit 13 may perform the following logical operations:

S_hold＝not S_start-shut (2)

the logical operation unit 11 may perform the following logical operations:

S_mid＝(S_shut or S_hold)and(not S_start) (3)

as can be seen from the equations (1) - (3), when the power-on request signal S is asserted_startWhen the signal is continuously 0, as long as the shutdown request signal S_shutBriefly equal to 1, the start-stop signal S can be made_start-shut0. Start-stop signal S_start-shut0 results in a shutdown request hold signal S_hold1. At this time, even if the shutdown request signal S_shutBecomes 0, shutdown request hold signal S_holdCan still make the start-stop signal S_start-shut0. Thereby realizing the start-stop signal S_start-shutThe lock is 0. Thereby providing sufficient time for effectively disconnecting the first power source from the target electronic device. Ensuring that the target electronic device shutdown is successfully achieved.

As can be seen from the equations (1) - (3), when the power-on request signal S is asserted_startWhen the signal is 1, the start-stop signal S can be caused no matter what the state of other signals are_start-shut1. In other words, the lock can be released at this time, and the target electronic device can be turned on.

Optionally, the start-stop function circuit 1000 may further include a second power supply VCC. The second power supply VCC may be a low standby current power supply. When the target electronic device is powered off, the second power source VCC may be configured to supply power to at least one of the logic operation unit 11, the signal output unit 12, the signal feedback unit 13, and the switch unit 14.

As shown in FIG. 2, the logic unit 11 accesses the shutdown request signal S_shutA power-on request signal S_startAnd shutdown request hold signal S_holdAnd performing logic operation to generate start-stop intermediate signal S_mid. The logic operation unit 11 can also output the start-stop intermediate signal S to the signal output unit 12_mid. The logical operation unit 11 can realize the logical operation shown in equation (3).

As shown in fig. 2, the logical operation unit 11 may include: resistor R1, pull-down resistor RD1, diode D1. Wherein, the resistor R1 can be used for switching in the shutdown request signal S_shut. Resistor R1 may be connected to shutdown request signal S_shutThe signal source of (1). Shutdown request signal S_shutThe signal source of (a) may be a processor of the target electronic device.

Pull-down resistor RD1 may be connected across resistor R1 and signal ground. The pull-down resistor RD1 can be used for reducing interference, avoiding false operation of the start-stop function circuit caused by induced charge, and avoiding abnormal shutdown of the target electronic device.

As shown in FIG. 2, pull-down resistor RD1 may be connected to either end of resistor R1. In fig. 2, a pull-down resistor RD1 is connected to one end of the resistor R1 connected to the diode D1. The pull-down resistor RD1 may also be connected to the resistor R1 and the shutdown request signal S_shutTo the signal source.

During shutdown, the processor of the target electronic device may be out of control due to insufficient voltage. Diode D1 may now be used to prevent an unexpected output signal from the processor disrupting the shutdown process. The anode of diode D1 may be connected to resistor R1. Preventing shutdown request signal S_shutThe unexpectedly low level disrupts the shutdown process.

As shown in fig. 2, the logical operation unit 11 may further include: resistor R2 and resistor R3. The resistor R2 and the resistor R3 may be connected in series. Resistor R2 may be connected to the cathode of diode D1. The resistor R3 may be connected to the signal feedback unit 13. The voltage dividing point of the resistor R2 and the resistor R3 may be connected to the output unit 12. The resistor R2, the resistor R3 and the diode D1 form an OR gate circuit to realize S_shut or S_holdAnd (6) operation.

As shown in fig. 2, the logical operation unit 11 may further include: resistor R4 and switch Q1. The resistor R4 can be used for accessing the power-on request signal S_start. The resistor R4 may be connected to the power-on request signal S_startThe signal source of (1). Starting up request signal S_startThe signal source of (a) may be a processor of the target electronic device; or other local circuitry independent of the processor, such as a clock circuit.

The switching transistor Q1 may be a unipolar transistor or a bipolar transistor. The switching transistor Q1 may be an N-channel fet or a P-channel fet. The switching tube Q1 may be a PNP transistor or an NPN transistor. The control terminal of the switching tube Q1 may be a base or a gate. The first end of the switching tube Q1 may be a collector or a drain. The second terminal of the switching transistor Q1 may be an emitter or a source.

As shown in the exemplary embodiment of fig. 2, the switching transistor Q1 is an NPN transistor. The control terminal of the switching tube Q1 may be connected to a resistor R4. A second terminal of the switching tube Q1 may be connected to signal ground. The resistor R4 and the switch tube Q1 form a NOT circuit to realize not S_startAnd (6) operation.

Alternatively, the first end of the switching tube Q1 may be connected to the resistor R2. When the first terminal of the switch transistor Q1 is at low level, no matter the shutdown request signal S_shutAnd shutdown request hold signal S_holdIn any state, the start-stop intermediate signal S can be enabled_midIs 0, i.e. implements not S_startAnd S_shut or S_holdThe logical and operation between them realizes the logical operation shown in equation (3).

As shown in fig. 2, a first terminal of the switching tube Q1 may be connected to any one terminal of the resistor R2. In fig. 2, a first terminal of the switching tube Q1 is connected to a terminal of the resistor R2 connected to the diode D1. Optionally, the first end of the switching tube Q1 may also be connected to the end of the resistor R2 connected to the resistor R3.

Optionally, the logical operation unit 11 may further include: pull-down resistor RD2, capacitor C1, and capacitor C2. The pull-down resistor RD2 may be used to discharge the induced charge at the control end of the switching tube Q1, so as to avoid the malfunction of the start/stop function circuit 1000 caused by the induced charge, which may cause abnormal start-up of the target electronic device.

A capacitor C1 may be connected across resistor R4 and signal ground. The capacitor C1 may form a first low pass filter with the resistor R4. A capacitor C2 may be connected across resistor R2 and signal ground. The capacitor C2 may form a second low pass filter with the resistor R2. Both the first low pass filter and the second low pass filter may be used to improve the interference rejection of the start-stop function circuit 1000.

As shown in fig. 3, the signal output unit 12 may include: a current limiting resistor RL1 and a switch tube Q2.

The switching transistor Q2 may be a unipolar transistor or a bipolar transistor. The switching transistor Q2 may be an N-channel fet or a P-channel fet. The switching tube Q2 may be a PNP transistor or an NPN transistor. The control terminal of the switching tube Q2 may be a base or a gate. The first end of the switching tube Q2 may be a collector or a drain. The second terminal of the switching transistor Q2 may be an emitter or a source.

As shown in the exemplary embodiment of fig. 3, the switching transistor Q2 may be an NPN transistor. A second terminal of the switching tube Q2 may be connected to signal ground. The control terminal of the switching tube Q2 may be connected to the logic operation unit 11 through a current limiting resistor RL 1. The current limiting resistor RL1 and the switching tube Q2 may form an inverted gate circuit, and the logical operation shown in equation (1) is realized. The first end of the switching tube Q2 may be connected to the signal feedback unit 13 and the switching unit 14, and the feedback unit13 and a switch unit 14 output a start-stop signal S_start-shut。

As shown in fig. 3, the signal output unit 12 may further include: pull-up resistor RU 1. One end of the pull-up resistor RU1 may be connected to the second power source VCC. The other end of the pull-up resistor RU1 may be connected to a first terminal of the switching tube Q2. On-off intermediate signal S_midWhen 0, pull-up resistor RU1 may be used to output a high level.

As shown in fig. 3, the signal output unit 12 may further include: pull-up resistor RU2 and diode D2. A diode D2 may be connected across the first terminal of the switching tube Q2 and the switching cell 14. A cathode of the diode D2 may be connected to a first terminal of the switching tube Q2. The anode of the diode D2 may be connected to the switching unit 14. The pull-up resistor RU2 may be connected between the second power supply VCC and the anode of the diode D2.

On-off intermediate signal S_midAt 0, the pull-up resistor RU1, the pull-up resistor RU2, and the diode D2 may be used to independently output a high level to the feedback unit 13 and the switching unit 14, respectively, and make the two outputs not affect each other.

As shown in fig. 3, the signal output unit 12 may further include: pull down resistor RD 3. The pull-down resistor RD3 can be used for discharging the induced charges at the control end of the switch tube Q2, so that the misoperation of the start-stop function circuit 1000 caused by the induced charges is avoided.

As shown in fig. 4, the signal feedback unit 13 may include a switching tube Q3 and a current limiting resistor RL 2. The switching tube Q3 and the current-limiting resistor RL2 may form an inverter circuit, and implement the logic calculation shown in equation (2).

The switching transistor Q3 may be a unipolar transistor or a bipolar transistor. The switching transistor Q3 may be an N-channel fet or a P-channel fet. The switching tube Q3 may be a PNP transistor or an NPN transistor. The control terminal of the switching tube Q3 may be a base or a gate. The first end of the switching tube Q3 may be a collector or a drain. The second terminal of the switching transistor Q3 may be an emitter or a source.

As shown in the exemplary embodiment of fig. 4, the switching transistor Q3 is a PNP transistor. The control terminal (base) of the switching tube Q3 may be connected to the signal output unit 12 through a current limiting resistor RL 2. A first terminal (collector) of the switching tube Q3 is connected to the second power source VCC. The second end (emitter) of the switching tube Q3 is connected to the logical operation unit 11.

As shown in fig. 4, it is apparent that the voltage of the first terminal (collector) of the switching tube Q3(PNP transistor) is higher than the voltage of the second terminal (emitter). The switching tube Q3 is thus in the reverse connection state. According to the characteristics of the triodes, the triodes which are reversely connected correspond to the triodes of the same type with the exchange positions of the collector and the emitter and the current gain (beta) of 1. Therefore, the switch Q3 is equivalent to a PNP transistor with a current gain (β) of 1, and the equivalent collector is connected to the logic operation unit 11 and the equivalent emitter is connected to the second power source VCC.

If the switching tube Q3 is not connected in reverse, the open loop gain of the closed loop circuit composed of the logic operation unit 11, the signal output unit 12 and the signal feedback unit 13 will be very large. At this time, the switching tube Q2 and the switching tube Q3 are both turned on due to the small disturbance of the closed loop circuit. And further causes the start-stop function circuit 1000 to start a shutdown action, so that the target electronic device is abnormally shut down.

The reverse connection mode of the switching tube Q3 can reduce the open-loop gain of the logic operation unit 11, the signal output unit 12 and the signal feedback unit 13 which are connected in a closed loop. Thereby avoiding the malfunction of the start-stop function circuit 1000 caused by small disturbance in the closed-loop circuit.

As shown in fig. 5, the switching unit 14 may include switching tubes Q4 and Q5. The switching unit 14 may further include a current limiting resistor RL3, a current limiting resistor RL4, a resistor R5, a pull-down resistor RD4, a diode D3, and a capacitor C3.

At least one of the switching tubes Q4 and Q5 may be a unipolar transistor or a bipolar transistor. At least one of the switching transistors Q4 and Q5 may be an N-channel fet or a P-channel fet. At least one of the switching tubes Q4 and Q5 may be a PNP transistor or an NPN transistor. The control terminal of at least one of the switching tubes Q4 and Q5 may be a base or a gate. The first terminal of at least one of the switching tubes Q4 and Q5 may be a collector or a drain. The second terminal of at least one of the switching tubes Q4 and Q5 may be an emitter or a source.

As shown in the exemplary embodiment shown in fig. 5, the switching transistor Q4 may be a P-channel field effect transistor. A first terminal of the switching tube Q4 may be connected to a power input VIN of a main functional unit of the target electronic device. A second terminal of the switching tube Q4 may be connected to the first power supply DC24V via a diode D3. The anode of the diode D3 may be connected to the first power source DC24V, and the cathode may be connected to the second terminal of the switching tube Q4.

As shown in the exemplary embodiment of fig. 5, the switching transistor Q5 may be an NPN transistor. The control terminal of the switching tube Q5 may be connected to the signal output unit 12 via a current limiting resistor RL 3. A second terminal of the switching tube Q5 may be connected to signal ground. The first terminal of the switching transistor Q5 may be connected to the control terminal of the switching transistor Q4 through a current limiting resistor RL 4.

Optionally, a pull-down resistor RD4 may be connected across the control terminal of the switch transistor Q5 and the signal ground. The capacitor C3 may also be connected across the control terminal of the switch Q5 and signal ground.

As shown in fig. 6, the second power conversion circuit may generate the second power VCC using the first power DC 24V. Alternatively, the second power conversion circuit may be a linear power conversion circuit. The second power conversion circuit may include a regulator chip U1. The second power conversion circuit may further include resistors R6, R7, R8, a capacitor C5, and a diode D4.

The diode D4 and the resistor R8 may be connected in series between the first power supply DC24V and the second power supply VCC. The output terminal of the regulator chip U1 may be connected to the second power supply VCC. The resistor R6 and the resistor R7 may be connected in series between the output of the regulated chip U1 and signal ground. The voltage dividing point of the resistor R6 and the resistor R7 may be connected to the feedback terminal of the regulator chip U1.

As shown in fig. 7, the self start-stop apparatus 2000 may include: a processor 21, a start-stop function circuit 23 and a first power supply 24.

The self-start-stop device 2000 can utilize the processor 21 and its peripheral circuits to realize the main functions of the self-start-stop device 2000. The processor 21 may be a Micro Controller Unit (MCU), among others. The processor 21 may be built into the target electronic device. When necessary, the processor 21 may output a shutdown request signal S to the start-stop function circuit 23_shutAnd requesting shutdown.

The processor 21 may have built in a real time clock component 211. Optionally, the real-time clock component 211 may be configured to output a power-on request signal. The start-up request signal may be sent from the rtc component 211 to the start-stop function circuit 23 within a preset time after the start-stop device 2000 is turned off. The power-on request signal may be used to wake up the autostart 2000.

The first power supply 24 is used to power the processor 21 and its peripheral circuits. The connection/disconnection of the first power supply 24 to the processor 21 and its peripheral circuits may be controlled by the start-stop function circuit 23.

The start-stop function circuit 23 may be any of the start-stop function circuits described above. May be on receiving a shutdown request signal S_shutThe start-stop function circuit 23 may then start the shutdown process. During shutdown, the start-stop function circuit 23 may disconnect the first power supply 24 from the processor 21 and its peripheral circuits, and stop supplying power to the processor 21 and its peripheral circuits. Upon receiving a power-on request signal S_startThe start-stop function circuit 23 may then start the boot process. During the boot process, the start-stop function circuit 23 may turn on the connection between the first power supply 24 and the processor 21 and its peripheral circuits, and start to supply power to the processor 21 and its peripheral circuits.

The application also provides an embodiment of the vehicle-mounted terminal, which comprises any one of the self-starting and stopping devices.

The in-vehicle terminal may be built in the target vehicle. The target vehicle may be a vehicle for passenger transport, such as: a taxi, a school bus, or other various types of passenger cars. The target vehicle may also be a vehicle for freight, such as a slag car, a commercial concrete car, a dangerous goods car, or the like. The target vehicle may also be a special function vehicle such as various types of engineering vehicles and the like.

The vehicle-mounted terminal can intermittently monitor the target vehicle when the target vehicle stops. The vehicle-mounted terminal can be closed after the preset parameters of the target vehicle are scanned for one time. And after a preset time interval, the vehicle-mounted terminal is turned on again, preset parameters of the target vehicle are scanned again, and the operation is repeated. Therefore, the monitoring requirement of the target vehicle can be met while the power consumption is reduced as much as possible. The preset parameters may include position information of the target vehicle, whether doors and/or windows are closed, and the like. The preset time interval may be one second, one minute, or other time interval.

In other embodiments provided herein, a self-start-stop apparatus is provided. The automatic start-stop device can be contained in the vehicle-mounted terminal. The vehicle-mounted terminal can be applied to commercial vehicles. The automatic start-stop device can utilize the start-stop function circuit to realize automatic start-stop. The automatic starting and stopping device can automatically shut down after finishing the preset task. The power supply of the main part in the self-starting and stopping device can be closed. Only the power supply of the real time clock component is retained. Therefore, the energy consumption of the automatic start-stop device can be greatly reduced. After the power-off, the power-on can be started according to the power-on request signal sent by the real-time clock component. And re-executing the preset task when the computer is started. The preset task may be a monitoring task of the target vehicle.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.

Claims

1. An automatic start-stop device, comprising:

the processor outputs a shutdown request signal and a startup request signal;

a first power supply to supply power to the processor;

a start-stop function circuit which cuts off the connection between the first power supply and the processor after receiving the shutdown request signal and closes the connection between the first power supply and the processor when receiving the startup request signal,

the processor comprises a real-time clock component, and the real-time clock component outputs a starting request signal.

2. The automatic start-stop device according to claim 1, wherein the start-stop function circuit comprises:

the logic operation unit receives the shutdown request signal, the startup request signal and the shutdown request holding signal, performs logic operation and generates a start-stop intermediate signal;

the signal output unit generates a start-stop signal according to the start-stop intermediate signal;

the signal feedback unit generates the shutdown request holding signal according to the start-stop signal;

and the switch unit cuts off/conducts the connection between the first power supply and the main functional unit according to the start-stop signal.

3. Automatic start-stop device according to claim 2,

the real-time clock component outputs a pulse signal of a real-time clock period as the start-up request signal with effective high level or outputs the start-up request signal with ineffective low level, and the shutdown request signal is effective with high level.

4. Automatic start-stop device according to claim 3,

the signal output unit performs the following logical operations:

S_start-shut＝not S_mid；

the signal feedback unit performs the following logical operations:

S_hold＝not S_start-shut；

the logical operation unit performs the following logical operations:

S_mid＝(S_shutor S_hold)and(not S_start)；

wherein S is_midFor the start-stop intermediate signal, S_shutIs the shutdown request signal, S_holdHolding a signal for said shutdown request, S_startIs the start-up request signal, S_start-shutThe signal is the start-stop signal;

the shutdown request signal and the startup request signal are active at high levels.

5. The automatic start-stop device according to claim 4, wherein the logic operation unit comprises:

the first resistor is connected with the shutdown request signal;

a first diode having an anode connected to the first resistor;

a second resistor connected between the cathode of the first diode and the signal output unit;

a third resistor connected between the signal feedback unit and the second resistor;

and a first end and a second end of the first switch tube are respectively connected to the cathode of the first diode and a signal ground, and a control end of the first switch tube is connected to the starting-up request signal.

6. The automatic start-stop device according to claim 5, wherein the logic operation unit further comprises:

a first pull-down resistor connected with the first resistor;

the second pull-down resistor is connected with the control end of the first switching tube;

the first low-pass filter is connected with the control end of the first switching tube;

and the second low-pass filter is connected between the cathode of the first diode and the signal output unit.

7. The automatic start-stop device according to claim 6, wherein the signal output unit comprises:

a second end of the second switching tube is connected with a signal ground, and a first end of the second switching tube is connected with the signal feedback unit;

the first current limiting resistor is connected between the logic operation unit and the control end of the second switching tube;

the third pull-down resistor is connected with the first current-limiting resistor;

the first pull-up resistor is connected between the first end of the second switching tube and a second power supply;

a cathode of the second diode is connected with a second end of the second switching tube, and an anode of the second diode is connected with the switching unit;

and the second pull-up resistor is connected between the anode of the second diode and the second power supply.

8. The automatic start-stop device according to claim 7, wherein the signal feedback unit comprises:

a first end and a second end of the third switching tube are respectively connected with the second power supply and the logic operation unit;

and the second current limiting resistor is connected with the signal output unit and the control end of the third switching tube.

9. Automatic start-stop device according to claim 8,

the third switching tube is a PNP type triode, the control end of the third switching tube is a base electrode, the first end of the third switching tube is a collector electrode, and the second end of the third switching tube is a source electrode;

the first end of the third switching tube is connected to the second power supply;

and the second end of the third switching tube is connected to the logic operation unit.

10. A vehicle-mounted terminal comprising the automatic start-stop device of any one of claims 1-9.

11. A commercial vehicle comprising the in-vehicle terminal according to claim 10.