CN113665508B

CN113665508B - Automatic start-stop device, vehicle-mounted terminal and commercial vehicle

Info

Publication number: CN113665508B
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: 2023-06-20
Anticipated expiration: 2041-07-15
Also published as: CN113665508A

Abstract

The application provides a start-stop function circuit, a self-start-stop device and a vehicle-mounted terminal. Wherein, start and stop function circuit contains in the device that has the function of starting certainly and stopping, includes: 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 startup and shutdown intermediate signal; the signal output unit generates a start-stop signal according to the start-stop intermediate signal; a signal feedback unit for generating the shutdown request holding signal according to the start-stop signal; and the switch unit cuts off/closes 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 train, freight train, sediment soil car, dangerous goods car, in particular to a self-starting stop device and a vehicle-mounted terminal, a commercial car.

Background

Currently, a company organization operating and managing a vehicle needs to remotely monitor position information and driver states of the vehicle. When the vehicle is in a stopped state, the vehicle is also required to be monitored by the operation management mechanism of the vehicle.

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

Disclosure of Invention

Based on this, this application provides a self-starting 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 for powering 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, and the real-time clock component 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 startup and shutdown intermediate signal; the signal output unit generates a start-stop signal according to the start-stop intermediate signal; a signal feedback unit for generating the shutdown request holding signal according to the start-stop signal; and the switch unit cuts off/turns on 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 power-on request signal with high level valid or outputs the power-on request signal with low level invalid, and the power-off request signal is high level valid.

Optionally, the signal output unit performs the following logical operations: s is S _start-shut ＝notS _mid The method comprises the steps of carrying out a first treatment on the surface of the The signal feedback unit performs the following logical operations: s is S _hold ＝notS _start-shut The method comprises the steps of carrying out a first treatment on the surface of the The logic operation unit performs the following logic operations: s is S _mid ＝(S _shut orS _hold )and(notS _start ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein S is _mid For the start-stop intermediate signal S _shut For the shutdown request signal, S _hold Hold signal for the shutdown request, S _start For the start-up request signal S _start-shut The start-stop signal is; the power-off request signal and the power-on request signal are active high.

Optionally, the logic operation unit includes: a first resistor connected to the shutdown request signal; a first diode, an anode of which is connected with 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 the control end of the first switching tube is connected with the starting request signal.

Optionally, the logic operation unit further includes: a first pull-down resistor connected to the first resistor; the second pull-down resistor is connected with the control end of the first switch 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: the second end of the second switching tube is connected with the signal ground, and the 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 the second power supply; the cathode of the second diode is connected with the second end of the second switching tube, and the 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: the first end and the second end of the third switching tube are respectively connected with the second power supply and the logic operation unit; 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 triode, the control end of the third switching tube is a base, the first end is a collector, and the second end is a source; the first end of the third switching tube is connected with the second power supply; the second end of the third switching tube is connected with the logic operation unit.

Optionally, the pulse width of the start-up request signal is 30 μs.

The application also provides a vehicle-mounted terminal, which comprises any one of the automatic start-stop devices.

The application also provides a commercial vehicle comprising 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 automatic start-stop 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 in accordance with the shutdown request signal. During shutdown, the processor may run away due to power loss, outputting an unexpected, indeterminate signal on the associated pin of the shutdown request signal. In order to avoid the influence of the uncertain signal on the shutdown process. When the shutdown process is started, the start-stop function circuit provided by the application can lock the start-stop signal into a shutdown state by utilizing a closed loop circuit formed by the logic operation unit, the signal output unit and the signal feedback unit, 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, so that the power supply is stopped, and the shutdown is realized.

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

At least one of the logic operation unit, the signal output unit and the signal feedback unit can be implemented by using discrete switching tubes. The implementation mode has simple structure and low cost.

In some embodiments provided herein, the switching transistor in the signal feedback unit may be a reverse-connected transistor. The reverse-connected transistor corresponds to a transistor with a current gain (beta) of 1. The open loop gain of the closed loop circuit formed by the logic operation unit, the signal output unit and the signal feedback unit can be reduced by using the mode. Thereby avoiding misoperation caused by oversensitivity of the start-stop function circuit. Thus, the anti-interference capability of the start-stop function circuit can be improved.

In other embodiments provided herein, a self-starting and stopping device is provided. The automatic start-stop device can be contained in a vehicle-mounted terminal. The vehicle-mounted terminal can be applied to a commercial automobile. The automatic start-stop device can utilize the start-stop function circuit to realize automatic start-stop. The automatic start-stop device can be automatically turned off after the preset task is completed. The supply of electrical energy from the main part of the inside of the start-stop device can be shut off. 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 power-off, the power-on can be started according to a power-on request signal sent by the RTC functional unit. And re-executing the preset task when starting up. 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 automatic start-stop device. When the target vehicle is in a long-term stop state, the vehicle-mounted terminal can utilize the self-starting and stopping device to realize intermittent monitoring of the target vehicle.

The vehicle-mounted terminal can alternately enter a starting-up state and a closing-down state according to preset time intervals. In the starting-up state, the vehicle-mounted terminal can scan preset parameters of the target vehicle, and the monitoring function is realized. In the shutdown state, the vehicle-mounted terminal can shut down the energy supply of the main components, and maintain extremely low power consumption. Therefore, the monitoring of the target vehicle can be realized under the condition of ensuring lower power loss. Under the condition that the target vehicle is parked for a long time, the electric energy pre-stored in the automobile battery is not consumed due to the monitoring action implemented by the vehicle-mounted terminal, and the ignition can be ensured when the automobile is used next time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art from these drawings without departing from the scope of protection of the present application.

Fig. 1 shows a schematic diagram of a start-stop function circuit according to an 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 the 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 of a self-starting-stopping 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 a vehicle-mounted monitoring terminal. In practical use, it can be applied to, for example: taxis, earth-moving vehicles, commercial concrete vehicles, monitored vehicles, and the like.

The in-vehicle terminal may perform monitoring on the target vehicle. The monitored range may include the position of the target vehicle, whether the door is open, or other important switching value information, analog value information, video/audio information.

When the target vehicle is parked, the in-vehicle terminal needs to detect whether the target vehicle is stolen or abnormally moved, or the like. Thus, when the target vehicle is parked, the in-vehicle terminal is required to monitor the aforementioned information of the target vehicle at regular time. However, if the monitoring process consumes too much power, it may result in premature consumption of battery power for the light target vehicle. Thus, the monitoring process may not be continuously and effectively performed; and may cause misfire when the target vehicle is in use.

For this purpose, the self-start/stop device provided by the application needs to be built in the vehicle-mounted terminal. So that the target vehicle can be monitored periodically. And closing the vehicle-mounted terminal between the two monitoring steps, so that the standby power of the vehicle-mounted terminal can be reduced to the minimum.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

As shown in fig. 1, the start-stop function circuit 1000 may be built in 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 switching unit 14. The logic operation unit 11, the signal output unit 12, and the signal feedback unit 13 are connected in a closed loop, and are used for processing the self-start-stop logic calculation of the target electronic device (not shown). The switch unit 14 can be used for controlling the switch unit according to the start-stop signal S output by the signal output unit 12 _start-shut The first power supply DC24V is controlled to be disconnected/connected with the main functional unit of the target electronic device, so that the self-starting and stopping of the target electronic device can be realized.

At the start-stop signal S _start-shut When=0, the switching unit 14 may be driven to cut off the connection between the first power DC24V and the power input terminal VIN of the main functional unit of the target electronic device, so that the target electronic device is turned off; at the start-stop signal S _start-shut When=1, the switching unit 14 may be driven to close the connection between the first power DC24V and the power 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 from a processor of a target electronic device _shut After that, the start-stop function circuit 1000 starts the shutdown process, shutting off the power supply to the processor. When the power 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, a shutdown request hold signal S which can be output by the signal feedback unit 13 _hold Maintain start-stop signal S _start-shut 0, thereby ensuring that the target electronic device can be successfully powered off.

As shown in fig. 1, the logic operation unit 11 may receive a shutdown request signal S _shut A start-up request signal S _start And a shutdown request hold signal S _hold And performs logic operation to generate a start-stop intermediate signal S _mid . Wherein, the shutdown request signal S _shut May be issued by a processor (not shown) of the target electronic device. Start-up request signal S _start May be initiated by a wake-up source (not shown). The wake-up source may be independent of the target electronic device or may be internal to the target electronic device. Alternatively, the wake-up source may also be provided within the processor of the target electronic device.

The signal output unit 12 can output a start-stop intermediate signal S _mid Generating a start-stop signal S _start-shut . The signal feedback unit 13 can be based on the start-stop signal S _start-shut Generating a shutdown request hold signal S _hold 。

Optionally, a shutdown request signal S _shut =1 may indicate that the shutdown request is valid. Start-up request signal S _start =1 may indicate that the power-on request is valid. Shutdown request hold signal S _hold =1 may indicate that the shutdown request is valid. 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 _shut A start-up request signal S _start And a shutdown request hold signal S _hold Are active high (i.e., active when equal to 1). Start-stop signal S _start-shut The 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 logic operation unit 11 may perform the following logic operations:

S _mid ＝(S _shut or S _hold )and(not S _start ) (3)

as can be seen from equations (1) - (3), when the power-on request signal S _start When the duration is 0, the power-off request signal S is only needed _shut The start-stop signal S can be made to be 1 briefly _start-shut =0. Start-stop signal S _start-shut =0 will result in a shutdown request hold signal S _hold =1. At this time, even if the shutdown request signal S _shut Becomes 0, shutdown request hold signal S _hold The start-stop signal S can still be caused _start-shut =0. Thereby realizing the start-stop signal S _start-shut Locking to 0. Thereby providing sufficient time for effectively disconnecting the first power source from the target electronic device. Ensuring that the target electronic device is successfully powered off.

As can be seen from equations (1) - (3), when the power-on request signal S _start When 1, the start-stop signal S can be caused no matter what other signals are _start-shut =1. That is, the lock can be released at this time, and the power-on of the target electronic device can be realized.

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. The second power VCC may be used to power at least one of the logic operation unit 11, the signal output unit 12, the signal feedback unit 13, and the switching unit 14 when the target electronic device is turned off.

As shown in fig. 2, the logic operation unit 11 accesses the shutdown request signal S _shut A start-up request signal S _start And a shutdown request hold signal S _hold And performs logic operation to generate a start-stop intermediate signal S _mid . The logic operation unit 11 can also output a start-stop intermediate signal S to the signal output unit 12 _mid . The logic operation unit 11 can implement the logic operation shown in the expression (3).

As shown in fig. 2, the logic operation unit 11 may include: resistor R1, pull-down resistor RD1, diode D1. Wherein the resistor R1 can be used for switching inShutdown request signal S _shut . Resistor R1 may be connected to shutdown request signal S _shut Is a signal source of (a). Shutdown request signal S _shut The 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 malfunction of the start-stop function circuit caused by induced charges, and avoiding abnormal shutdown of the target electronic device.

As shown in fig. 2, a pull-down resistor RD1 may be connected to either end of the resistor R1. In fig. 2, a pull-down resistor RD1 is connected to one end of the resistor R1 connected to the diode D1. Pull-down resistor RD1 may also be connected to resistor R1 and shutdown request signal S _shut One end of the signal source is connected with the other end of the signal source.

During shutdown, the processor of the target electronic device may run away due to insufficient voltage. Diode D1 may then be used to prevent the processor's unexpected output signal from disrupting the shutdown process. The anode of diode D1 may be connected to resistor R1. Prevent the shutdown request signal S _shut The unexpectedly occurring low level damages the shutdown process.

As shown in fig. 2, the logic 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 division 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 orS _hold And (5) calculating.

As shown in fig. 2, the logic operation unit 11 may further include: resistor R4 and switching tube Q1. Resistor R4 may be used to access power-on request signal S _start . Resistor R4 can be connected to power-on request signal S _start Is a signal source of (a). Start-up request signal S _start The signal source of (a) may be a processor of the target electronic device; other local circuits independent of the processor are also possible, such as clock circuits.

The switching transistor Q1 may be a unipolar transistor or a bipolar transistor. The switching transistor Q1 may be an N-channel field effect transistor or a P-channel field effect transistor. The switching transistor 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 terminal of the switching transistor 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. The second terminal of the switching tube Q1 may be connected to signal ground. The resistor R4 and the switching tube Q1 form a NOT circuit to realize the notS _start And (5) calculating.

Alternatively, the first terminal of the switching tube Q1 may be connected to the resistor R2. When the first end of the switching tube Q1 is at a low level, no matter the shutdown request signal S _shut And a shutdown request hold signal S _hold In any state, the start-stop intermediate signal S can be caused _mid Is 0, i.e. to realize notS _start And S is _shut orS _hold The logical AND operation between the two functions realizes the logical operation shown in the formula (3).

As shown in fig. 2, the first terminal of the switching tube Q1 may be connected to either 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. Alternatively, the first end of the switching tube Q1 may be connected to the end of the resistor R2 connected to the resistor R3.

Optionally, the logic operation unit 11 may further include: pull-down resistor RD2, capacitor C1, and capacitor C2. The pull-down resistor RD2 can be used for discharging 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, and 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 constitute a first low-pass filter with the resistor R4. Capacitor C2 may be connected across resistor R2 and signal ground. The capacitor C2 may constitute 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 tamper resistance 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 switching tube Q2.

The switching transistor Q2 may be a unipolar transistor or a bipolar transistor. The switching transistor Q2 may be an N-channel field effect transistor or a P-channel field effect transistor. The switching transistor 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 terminal of the switching transistor 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 shown in fig. 3, the switching transistor Q2 may be an NPN transistor. A second terminal of the switching transistor Q2 may be connected to signal ground. The control end of the switching tube Q2 may be connected to the logic operation unit 11 through the current limiting resistor RL 1. The current limiting resistor RL1 and the switching tube Q2 may form an inverse gate circuit to implement the logic operation shown in the formula (1). A first end of the switching tube Q2 can be connected with the signal feedback unit 13 and the switching unit 14, and outputs a start-stop signal S to the feedback unit 13 and the switching unit 14 _start-shut 。

As shown in fig. 3, the signal output unit 12 may further include: pull up resistor RU1. One end of the pull-up resistor RU1 may be connected to the second power VCC. The other end of RU1 of the pull-up resistor may be connected to a first end of the switching tube Q2. Start-stop intermediate signal S _mid When=0, the 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. The diode D2 may be connected across the first terminal of the switching tube Q2 and the switching unit 14. The cathode of the diode D2 may be connected to the 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 source VCC and the anode of the diode D2.

Start-stop intermediate signal S _mid When=0, the pull-up resistor RU1, the pull-up resistor RU2, and the diode D2 can be used to independently supply the feedback unit 13 and the switch, respectivelyThe unit 14 outputs a high level and makes the two outputs not mutually influence.

As shown in fig. 3, the signal output unit 12 may further include: pull-down resistor RD3. The pull-down resistor RD3 can be used to discharge the induced charge at the control end of the switching tube Q2, so as to avoid malfunction of the start-stop function circuit 1000 caused by the induced charge.

As shown in fig. 4, the signal feedback unit 13 may include a switching tube Q3 and a current limiting resistor RL2. The switching tube Q3 and the current limiting resistor RL2 can form an NOT circuit to realize the logic calculation shown in the formula (2).

The switching transistor Q3 may be a unipolar transistor or a bipolar transistor. The switching transistor Q3 may be an N-channel field effect transistor or a P-channel field effect transistor. The switching transistor 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 terminal of the switching transistor 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 RL2. The first terminal (collector) of the switching transistor Q3 is connected to the second power supply VCC. The second terminal (emitter) of the switching tube Q3 is connected to the logic operation unit 11.

As shown in fig. 4, it is apparent that the voltage of the first terminal (collector) of the switching transistor Q3 (PNP transistor) is higher than the voltage of the second terminal (emitter). The switching tube Q3 is thus in the reverse connection state. From the characteristics of the transistor, the reverse transistor corresponds to a same type of transistor in which the collector and emitter are switched and the current gain (β) is 1. The switching transistor Q3 is thus 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 supply VCC.

If the switching tube Q3 is not connected in reverse, the open loop gain of the closed loop circuit consisting 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 small disturbance of the closed loop circuit causes both the switching tube Q2 and the switching tube Q3 to be turned on. Thereby causing the start-stop function circuit 1000 to start a shutdown operation, so that the target electronic device is abnormally shut down.

The open loop gain of the logic operation unit 11, the signal output unit 12, and the signal feedback unit 13 connected in a closed loop can be reduced by the reverse connection mode of the switching tube Q3. Thus, malfunction of the start-stop function circuit 1000 caused by micro disturbance in the closed loop circuit can be avoided.

As shown in fig. 5, the switching unit 14 may include switching transistors 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 transistors Q4 and Q5 may be a unipolar transistor or a bipolar transistor. At least one of the switching transistors Q4 and Q5 is an N-channel field effect transistor, or may be a P-channel field effect transistor. At least one of the switching transistors Q4 and Q5 may be a PNP transistor or an NPN transistor. The control terminal of at least one of the switching transistors Q4 and Q5 may be a base or a gate. The first terminal of at least one of the switching transistors Q4 and Q5 may be a collector or a drain. The second terminal of at least one of the switching transistors Q4 and Q5 may be an emitter or a source.

As shown in the example 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 the power input terminal VIN of the main functional unit of the target electronic device. A second terminal of the switching transistor Q4 may be connected to the first power supply DC24V via a diode D3. The diode D3 may have an anode connected to the first power source DC24V and a cathode connected to the second terminal of the switching tube Q4.

As shown in the exemplary embodiment shown in 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 transistor Q5 may be connected to signal ground. The first end of the switching tube Q5 may be connected to the control end of the switching tube Q4 through a current limiting resistor RL 4.

Alternatively, the pull-down resistor RD4 may be connected across the control terminal of the switching transistor Q5 and signal ground. Capacitor C3 may also be connected across the control terminal of switching tube 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 voltage stabilizing 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 source DC24V and the second power source VCC. The output terminal of the voltage stabilizing chip U1 may be connected to the second power source VCC. The resistor R6 and the resistor R7 may be connected in series between the output terminal of the voltage stabilizing chip U1 and the signal ground. The voltage division points of the resistor R6 and the resistor R7 may be connected to the feedback terminal of the voltage stabilizing chip U1.

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

The self-starting and stopping device 2000 can utilize the processor 21 and its peripheral circuits to realize the main functions of the self-starting and stopping device 2000. The processor 21 may be a micro control unit (Microcontroller Unit; MCU), among others. The processor 21 may be built-in inside the target electronic device. The processor 21 may output a shutdown request signal S to the start-stop function circuit 23 when necessary _shut A shutdown is requested.

The processor 21 may have a real time clock component 211 built into it. Alternatively, the real-time clock component 211 may be configured to output a power-on request signal. The start-up request signal may be sent by the real-time clock component 211 to the start-stop function circuit 23 within a preset time after the self-start-stop device 2000 is turned off. The power-on request signal may be used to wake up the self-starting-stop device 2000.

The first power supply 24 is used for supplying power to the processor 21 and its peripheral circuits. The on/off state of the first power supply 24 and the processor 21 and its peripheral circuits can 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. Can be after receiving the shutdown request signal S _shut Thereafter, the start-stop function circuit 23 may initiate a shutdown process. During shutdown, the start-stop function circuit 23 may cut off the connection between the first power supply 24 and the processor 21 and its peripheral circuits, and stop the power supply to the processor 21 and its peripheral circuits. Upon receiving the start-up request signal S _start The start-stop function 23 may then initiate the start-up procedure. During the power-on process, the start-stop function circuit 23 may switch on the connection between the first power source 24 and the processor 21 and its peripheral circuits to start supplying 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 automatic start-stop devices.

The in-vehicle terminal may be built in the target vehicle. The target vehicle may be a vehicle for passenger transport, such as: taxis, school buses, or other various types of passenger cars. The target vehicle may also be a vehicle for freight transportation, such as a freight vehicle, e.g., a muck vehicle, a commercial concrete vehicle, a hazardous material vehicle, etc. The target vehicle may also be a special function vehicle, such as various types of engineering vehicles, etc.

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

In other embodiments provided herein, a self-starting and stopping device is provided. The automatic start-stop device can be contained in a vehicle-mounted terminal. The vehicle-mounted terminal can be applied to a commercial automobile. The automatic start-stop device can utilize the start-stop function circuit to realize automatic start-stop. The automatic start-stop device can be automatically turned off after the preset task is completed. The supply of electrical energy from the main part of the inside of the start-stop device can be shut off. Only the power supply to the real time clock assembly is maintained. Therefore, the energy consumption of the automatic start-stop device can be greatly reduced. After shutdown, the system can be started according to a starting request signal sent by the real-time clock component. And re-executing the preset task when starting up. The preset task may be a monitoring task of the target vehicle.

The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples have been provided herein to illustrate the principles and embodiments of the present application, and wherein the above examples are provided to assist in the understanding of the methods and concepts of the present application. Meanwhile, based on the ideas of the present application, those skilled in the art can make changes or modifications on the specific embodiments and application scope of the present application, which belong to the scope of the protection of the present application. In view of the foregoing, this description should not be construed as limiting the application.

Claims

1. A self-starting and stopping device, comprising:

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

a first power supply for powering the processor;

a start-stop function circuit for cutting off the connection between the first power supply and the processor after receiving the power-off request signal, closing the connection between the first power supply and the processor when receiving the power-on request signal,

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 startup and shutdown intermediate signal;

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

a signal feedback unit for generating the shutdown request holding signal according to the start-stop signal;

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

the processor comprises a real-time clock component, wherein the real-time clock component outputs a starting-up request signal;

the real-time clock component outputs a pulse signal of one real-time clock period as the power-on request signal with high level effective or outputs the power-on request signal with low level ineffective, and the power-off request signal is high level effective;

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 logic operation unit performs the following logic operations:

S _mid =(S _shut or S _hold ) and ( not S _start )；

wherein S is _mid For the start-stop intermediate signal S _shut For the shutdown request signal, S _hold Hold signal for the shutdown request, S _start For the start-up request signal S _start-shut The start-stop signal is;

the power-off request signal and the power-on request signal are active high.

2. The automatic start-stop device according to claim 1, wherein the logic operation unit includes:

a first resistor connected to the shutdown request signal;

a first diode, an anode of which is connected with 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 the control end of the first switching tube is connected with the starting request signal.

3. The automatic start-stop device according to claim 2, wherein the logic operation unit further includes:

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

the second pull-down resistor is connected with the control end of the first switch 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.

4. A self-starting and stopping device as defined in claim 3, wherein the signal output unit comprises:

the second end of the second switching tube is connected with the signal ground, and the 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 the second power supply;

the cathode of the second diode is connected with the second end of the second switching tube, and the 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.

5. The self-starting and stopping device according to claim 4, wherein the signal feedback unit comprises:

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

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

6. A self-starting and stopping device as defined in claim 5, wherein,

the third switching tube is a PNP 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 with the second power supply;

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

7. A vehicle-mounted terminal comprising the self-start-stop device according to any one of claims 1 to 6.

8. A commercial vehicle comprising the vehicle-mounted terminal of claim 7.