Timing wake-up circuit of vehicle-mounted controller

Abstract

The invention provides a timing wake-up circuit of a vehicle-mounted controller, and relates to the technical field of circuit control, and the timing wake-up circuit comprises a power supply circuit, a timing circuit and a wake-up circuit. The output end of the timing circuit is connected with the input end of the wake-up circuit, and the output end of the wake-up circuit is connected with the enable input end of the power supply circuit; the output end of the power supply circuit is connected with the input end of the vehicle-mounted controller; the timing circuit is used for generating a wake-up signal when the timing pulse count reaches a preset time threshold, and sending the wake-up signal to the wake-up circuit; the wake-up circuit is used for generating a power supply enable signal based on the received wake-up signal and sending the power supply enable signal to the power supply circuit; and the power supply circuit is used for supplying power to the vehicle-mounted controller after receiving the power supply enable signal so as to wake up the vehicle-mounted controller. The periodic self-wake-up circuit of the vehicle-mounted controller is low in cost and small in development difficulty.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a timed wake-up circuit for a vehicle-mounted controller. Background Art

[0002] Traditional vehicle controller wake-up methods include KL15 hard-line wake-up and network management message wake-up; network management message wake-up and KL15 hard-line wake-up cannot achieve timed wake-up; and with the development of automotive electronic technology, the requirements for automotive safety are getting higher and higher. Many scenarios require that the vehicle be able to wake up at a scheduled time to complete some functions during parking. For example, for vehicle safety, it is necessary to wake up the vehicle controller at a scheduled period so that the controller can self-check whether there is a fault. If there is a fault, the user will be notified through the mobile terminal or the data will be uploaded to notify after-sales.

[0003] Existing timed wake-up generally uses chips with timing circuits or software timed wake-up. Chips with timing circuits are expensive, difficult to develop, and the timing frequency cannot be adjusted. They also consume a lot of power. Software timed wake-up has low reliability and poor real-time performance. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a timed wake-up circuit for a vehicle-mounted controller to solve the above-mentioned problems existing in the prior art, and to provide a periodic self-wake-up circuit for a vehicle-mounted controller with low cost and low development difficulty.

[0005] In a first aspect, a timed wake-up circuit of a vehicle-mounted controller is provided, the circuit may include: a power supply circuit, a timing circuit and a wake-up circuit; the output end of the timing circuit is connected to the input end of the wake-up circuit, the output end of the wake-up circuit is connected to the enable input end of the power supply circuit; the output end of the power supply circuit is connected to the input end of the vehicle-mounted controller;

[0006] The timing circuit is used to generate a wake-up signal when the timing pulse count reaches a preset number threshold, and send the wake-up signal to the wake-up circuit;

[0007] The wake-up circuit is used to generate a power supply enable signal based on the received wake-up signal, and send the power supply enable signal to the power supply circuit;

[0008] The power supply circuit is used to supply power to the vehicle-mounted controller to wake up the vehicle-mounted controller after receiving the power supply enable signal.

[0009] In an optional implementation, the timing circuit includes: a counting chip, a first resistor, a second resistor and a capacitor;

[0010] The counting chip comprises a signal forward output terminal, a signal reverse output terminal and a first input terminal;

[0011] The signal positive output end is connected to the first plate of the capacitor; the signal reverse output end is connected to one end of the second resistor of the timing circuit; the other end of the second resistor of the timing circuit is connected to the second plate of the capacitor;

[0012] The first input terminal of the counting chip is connected to one end of the first resistor of the timing circuit; the other end of the first resistor of the timing circuit is connected to the second electrode plate of the capacitor.

[0013] In an optional implementation, the counting chip further includes: a plurality of counting output terminals;

[0014] The wake-up circuit includes a first diode;

[0015] The output end of the first diode is connected to the enable input end; the input end of the first diode is connected to any counting output end of the counting chip.

[0016] In an optional implementation, the counting chip further includes: a second input terminal;

[0017] The timed wake-up circuit of the vehicle-mounted controller further includes: a reset circuit;

[0018] The input end of the reset circuit is connected to the first output end of the vehicle-mounted controller; the output end of the reset circuit is connected to the second input end of the counting chip.

[0019] In an optional implementation, the reset circuit includes: a first resistor, a second resistor, a third resistor and a triode;

[0020] One end of the first resistor of the reset circuit is connected to the first output end of the vehicle controller; the other end of the first resistor is respectively connected to the input end of the transistor and one end of the second resistor;

[0021] The other end of the second resistor is grounded; the first output end of the transistor is grounded;

[0022] The second output end of the transistor is connected to one end of the third resistor and the second input end of the counting chip respectively.

[0023] In an optional implementation, the second output terminal of the onboard controller is connected to a second diode;

[0024] The output end of the second diode is connected to the output end of the first diode.

[0025] In an optional implementation, different counting output terminals correspond to different timed wake-up intervals;

[0026] The number threshold is determined according to a timed wake-up interval corresponding to a counting output terminal connected to the input terminal of the first diode;

[0027] The timing circuit is specifically used to control the timing pulse count to reach the number threshold so that the time interval for generating the wake-up signal is the timing wake-up interval.

[0028] In an optional implementation, the counting chip is a CD4060 chip.

[0029] In an optional implementation, the wake-up circuit further includes a third diode and a fourth diode;

[0030] The input end of the third diode is connected to the ignition switch of the vehicle; the input end of the fourth diode is connected to the output end of the CAN transceiver of the vehicle;

[0031] The wake-up circuit is an OR gate circuit composed of the first diode, the third diode and the fourth diode; the output end of the wake-up circuit is connected to the enable input end.

[0032] This application uses low-cost chips to build a timed wake-up circuit, so that the vehicle controller has a timed wake-up function, which indirectly provides a basis for the car to realize more and smarter functions. This application does not need to install a chip with a built-in timing circuit, which greatly reduces the chip cost; this application is based on an ordinary counting chip to complete the timed wake-up by counting, without the participation of the network, etc., with high stability and reliability, and does not need to consume too many resources of the vehicle controller.

[0033] The present application can flexibly select the counting output terminal of the counting chip according to the needs of the user, thereby realizing the corresponding timing interval according to the timing requirements of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of a timed wake-up circuit of a vehicle controller provided in an embodiment of the present application;

[0036] Figure 2 A pin distribution diagram of a CD4060 provided in an embodiment of the present application;

[0037] Figure 3An internal structure diagram of a CD4060 provided in an embodiment of the present application;

[0038] Figure 4 A schematic diagram of an oscillation circuit of a CD4060 provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of a timed wake-up process of a vehicle controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The timed wake-up circuit of the vehicle controller adopted in the embodiment of the present application can be applied to the vehicle controller, which can be a single-chip microcomputer or other microprocessor; the vehicle controller includes: a first output terminal Tim_Rst, a second output terminal PWR_CTRL, an acquisition unit, a task execution unit, a state detection unit, a sleep unit and a stability control unit;

[0042] An acquisition unit, used for acquiring a state of a CAN transceiver of a vehicle connected to the vehicle controller via a CAN bus;

[0043] A task execution unit, used to execute a pre-configured timed wake-up task when the vehicle controller is awakened;

[0044] A state detection unit, used to detect the execution state of the timed wake-up task, the ignition state of the vehicle and the state of the CAN transceiver;

[0045] A sleep unit, for determining whether the vehicle controller enters a sleep state based on the execution state of the timed wake-up task, the ignition state of the vehicle, the state of the CAN transceiver and the configured sleep rule; if entering the sleep state, generating a sleep signal, and sending the sleep signal to the reset circuit via the first output terminal;

[0046] The stabilization control unit is used to generate a stabilization signal when the vehicle controller is awakened; and send the stabilization signal to the power circuit via the second output terminal PWR_CTRL and the second diode D3, so that the power circuit can stably supply power to the vehicle controller.

[0047] In an embodiment of the present application, when the vehicle is in an unignition state, the CAN transceiver is in a sleep state, and the vehicle controller has completed the scheduled wake-up task, it is determined that the vehicle controller should enter a sleep state; if any of the above states changes, the vehicle controller should be in a wake-up state.

[0048] The preferred embodiments of the present application are described below in conjunction with the drawings in the specification. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In addition, the embodiments and features in the embodiments of the present application may be combined with each other if there is no conflict.

[0049] Figure 1 This is a schematic diagram of a timed wake-up circuit of a vehicle controller provided in an embodiment of the present application. Figure 1 As shown, the circuit may include: a power supply circuit A, a timing circuit B, a wake-up circuit C and a reset circuit D.

[0050] Among them, the enable input terminal (i.e., EN terminal) of the power supply circuit A is connected to the output terminal of the wake-up circuit C; the output terminal of the power supply circuit A is connected to the input terminal of the vehicle controller E; the input terminal of the power supply circuit A is connected to the power switch KL30; the power supply circuit A is used to supply power to the vehicle controller E when the wake-up circuit C outputs a power enable signal, thereby waking up the vehicle controller E.

[0051] The wake-up circuit C is located between the power supply circuit A and the timing circuit B. The wake-up circuit C is an OR gate circuit composed of a first diode D4, a third diode D1 and a fourth diode D2. The input end of the wake-up circuit C is respectively connected to the ignition switch KL15 of the vehicle, the output end of the CAN transceiver of the vehicle and the counting output end of the timing circuit B. The wake-up circuit C is used to generate a power supply enable signal when the ignition switch KL15 is powered on or the CAN transceiver is awakened by the CAN network or the timing pulse count of the timing circuit B reaches a preset number threshold, and send the power supply enable signal to the power supply circuit A, so that the power supply circuit A supplies power to the vehicle controller E.

[0052] The output end of the timing circuit B is connected to the input end of the wake-up circuit C, the input end of the timing circuit B is connected to the output end of the reset circuit D, the input end of the reset circuit D is connected to the first output end of the vehicle controller E; the second output end of the vehicle controller E is connected to the enable input end of the power supply circuit A;

[0053] The timing circuit B generates a wake-up signal at each corresponding timing wake-up interval by counting the timing pulses, and sends the wake-up signal to the wake-up circuit C; the wake-up circuit C generates a power enable signal after receiving the wake-up signal, and transmits it to the power supply circuit A. The power supply circuit A receives the power enable signal and supplies power to the vehicle controller E. At the same time, after being powered, the vehicle controller E sends a stable signal to the enable input terminal of the power supply circuit A, so that the power supply circuit A can supply power to itself stably, thereby avoiding sudden power failure of the vehicle controller due to abnormality of the wake-up circuit; when the vehicle controller E is about to enter the sleep state, a sleep signal is generated and sent to the reset circuit D. After receiving the sleep signal, the reset circuit D will generate a reset signal and send the reset signal to the timing circuit B, thereby controlling the timing circuit B to start a new round of timing pulse counting.

[0054] In an embodiment of the present application, the input end of the third diode D1 of the wake-up circuit C is connected to the ignition switch KL15 of the vehicle; the input end of the fourth diode D2 of the wake-up circuit C is connected to the output end of the vehicle's CAN transceiver; and the first diode D4 of the wake-up circuit C is connected to any counting output end of the counting chip.

[0055] In an embodiment of the present application, the wake-up circuit C will not generate a power enable signal only when the ignition switch KL15 is not started, the CAN transceiver is not triggered, and the counting output terminal does not send a wake-up signal; when the ignition switch KL15 is started, the CAN transceiver is triggered, or the counting output terminal sends a wake-up signal, the wake-up circuit C will generate a power enable signal to wake up the vehicle controller.

[0056] In the embodiment of the present application, the timing circuit B includes a counting chip, a first resistor Rs, a second resistor Rx and a capacitor Cx; the counting chip includes a plurality of counting output terminals, a signal positive output terminal φ0, a signal reverse output terminal / φ0, a first input terminal φ1, a VDD pin and a second input terminal RESET;

[0057] The positive output terminal φ0 of the counting chip signal is connected to the first plate of the capacitor Cx; the reverse output terminal / φ0 of the signal is connected to one end of the second resistor Rx of the timing circuit; the other end of the second resistor Rx of the timing circuit is connected to the second plate of the capacitor Cx;

[0058] The first input terminal φ1 of the counting chip is connected to one end of the first resistor Rs of the timing circuit; the other end of the first resistor Rs of the timing circuit is connected to the second plate of the capacitor Cx.

[0059] In one embodiment of the present application, the counting chip is a counting chip with a built-in counter and an oscillator, such as a CD4060 chip.

[0060] In the embodiment of the present application, the frequency division coefficients of different counting output terminals of the counting chip are different, and the different frequency division coefficients result in different counting thresholds that need to be reached when performing timing pulse counting, and the time consumed to reach different counting thresholds is necessarily different. Therefore, in the initial circuit design stage, the user can determine the expected timing wake-up interval according to its own needs, and thus select different counting output terminals based on the expected timing wake-up interval; for example, the counting output terminals of the CD4060 chip include Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q12, Q13 and Q14, and the user can select any counting output terminal to connect to the wake-up circuit as needed.

[0061] In the embodiment of the present application, the first resistor Rs, the second resistor Rx and the capacitor Cx constitute an oscillating circuit, and the relationship between the period T of the oscillating circuit and the timed wake-up interval Twakeup is as follows:

[0062]

[0063] Wherein, N represents the frequency division coefficient of the counting output terminal of the selected counting chip, which can be obtained based on the configuration file of the chip.

[0064] For example, if Q14 is selected as the counting output terminal and the expected timed wake-up interval is 2 hours, then the frequency division coefficient of Q14 is N = 2 14 =16384, the period of the oscillation circuit

[0065] In practical applications, the calculated oscillation circuit period T is an ideal value, and there may not be a component with exactly the same period T. Therefore, after obtaining the period T, it is necessary to determine the value of Cx*Rx according to T=2.2*Cx*Rx, and then determine the value of the capacitor Cx and the value of the second resistor Rx based on experience. For example, if the capacitor Cx is 0.2uF and Rx is 1MΩ, T=2.2*0.2uF*1MΩ=0.44s;

[0066] Furthermore, the first resistor Rs is a compensation resistor, which can reduce the change of the oscillation period caused by the difference in device parameters and the change in power supply voltage, and improve the frequency stability of the oscillator. Usually Rs=10Rx. Therefore, after obtaining the second resistor Rx, the value of the first resistor is determined according to the formula Rs=10*Rx=10MΩ, so that the parameters of the component should be Cx=0.2uF, Rx=1MΩ, Rs=10MΩ, and the corresponding components can be selected.

[0067] In an embodiment of the present application, the reset circuit D includes: a first resistor Rb1, a second resistor Rb2, a third resistor Rc and a transistor Q1; one end of the first resistor Rb1 is connected to the first output terminal Tim_Rst of the vehicle controller; the other end of the first resistor Rb1 is respectively connected to the input end of the transistor Q1 and one end of the second resistor Rb2; the other end of the second resistor Rb2 is grounded; the first output end of the transistor is grounded; the second output end of the transistor is respectively connected to one end of the third resistor Rc and the second input terminal RESET of the counting chip; the other end of the third resistor Rc is connected to the power supply and the VDD pin of the counting chip.

[0068] In one embodiment of the present application, taking the CD4060 chip as an example, Figures 2 to 4 As shown, the timing wake-up circuit includes:

[0069] Wake-up circuit: The OR gate circuit is composed of diodes D4, D2, and D1. The output of the OR gate is connected to the enable signal of the power management. D1 is connected to the ignition switch KL15 signal. When KL15 is 12V, the power management is enabled, the output power is powered by the microcontroller, and the controller is awakened; D2 is connected to the wake-up output of the CAN transceiver. When the transceiver is awakened by the CAN network, it outputs 12V, the power management is enabled, the output power is powered by the vehicle controller, and the vehicle controller is awakened; D4 is connected to Q14 of the timing chip CD4060. According to the chip principle of CD4060, when the timing pulse count is greater than 16384 times, Q14 is 12V, the power management is enabled, the output power is powered by the microcontroller, and the controller is awakened; when KL15 is OFF, the CAN generator is not awakened by the bus network, and the timing chip Q14 is low. When the above three conditions are met at the same time, the power management enable signal is low, no voltage is output, and the controller is dormant.

[0070] Timing circuit: It is composed of CD4060, Rx, Rs, and Cx. Q14 of CD4060 is used as the wake-up pin. According to the preset timer wake-up interval of 2 hours, the oscillation period of the oscillation circuit is calculated: Cx = 0.2uF, Rx = 1MΩ, Rs = 10MΩ;

[0071] Reset circuit: Rb1, Rb2, Q1, and Rc form a reset circuit. Rb1 is connected to the IO port Tim_Rst of the microcontroller. When Tim_Rst outputs a high level, Q1 is turned on, REST of CD4060 is pulled low, and the timing circuit composed of CD4060 is reset and cleared. When the microcontroller Tim_Rst outputs a low level, Q1 is turned off, REST of CD4060 is pulled high by the pull-up resistor Rc, and the timing circuit composed of CD4060 counts regularly.

[0072] In the embodiments of the present application, Figure 5As shown, the working process of the timing wake-up circuit of the vehicle controller includes:

[0073] When the last timing time arrives (i.e., the timing time interval is reached), Q14 of CD4060 outputs a high level, the power management circuit outputs 5V, the MCU is powered on and wakes up, and the MCU output PWR_CTRL is set high to enable the power management circuit stably, thereby preventing the timing wake-up circuit from abnormal and causing the MCU to suddenly power off; Tim_Rst is set high, according to Figure 1 The hardware principle is that the timing circuit composed of CD4060 will be reset and the timing will stop; the microcontroller will run normally and perform the tasks required for the timing wake-up, such as data uploading and fault diagnosis;

[0074] When KL15 is OFF and the CAN transceiver is in sleep mode, the on-board controller starts the power-off sleep process; the on-board controller stores some currently running data in the non-volatile memory EEPROM; Tim_Rst is set to a low level, and the timing circuit composed of CD4060 will start timing from 0; PWR_CTRL is set to a low level, and the power management enable signal EN is low, the power management output is 0V, the microcontroller is powered off, and the on-board controller is in sleep mode.

[0075] Those skilled in the art will appreciate that the embodiments in the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt a complete hardware embodiment, a complete software embodiment, or a form of an embodiment combining software and hardware. Moreover, the present application may adopt a form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0076] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0077] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0078] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0079] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0080] Obviously, those skilled in the art can make various changes and modifications to the embodiments in the present application without departing from the spirit and scope of the embodiments in the present application. Thus, if these modifications and variations of the embodiments in the present application fall within the scope of the claims and their equivalents in the embodiments of the present application, the embodiments of the present application are also intended to include these modifications and variations.

Claims

1. A timed wake-up circuit for a vehicle controller, characterized in that: The circuit comprises: a power supply circuit, a timing circuit and a wake-up circuit; the output end of the timing circuit is connected to the input end of the wake-up circuit, the output end of the wake-up circuit is connected to the enable input end of the power supply circuit; the output end of the power supply circuit is connected to the input end of the vehicle controller; The timing circuit is used to generate a wake-up signal when the timing pulse count reaches a preset number threshold, and send the wake-up signal to the wake-up circuit; The wake-up circuit is used to generate a power supply enable signal based on the received wake-up signal, and send the power supply enable signal to the power supply circuit; The power supply circuit is used to supply power to the vehicle-mounted controller to wake up the vehicle-mounted controller after receiving the power supply enable signal.

2. The circuit according to claim 1, characterized in that The timing circuit comprises: a counting chip, a first resistor, a second resistor and a capacitor; The counting chip comprises a signal forward output terminal, a signal reverse output terminal and a first input terminal; The signal positive output end is connected to the first plate of the capacitor; the signal reverse output end is connected to one end of the second resistor of the timing circuit; the other end of the second resistor of the timing circuit is connected to the second plate of the capacitor; The first input terminal of the counting chip is connected to one end of the first resistor of the timing circuit; the other end of the first resistor of the timing circuit is connected to the second electrode plate of the capacitor.

3. The circuit according to claim 2, characterized in that The counting chip further comprises: a plurality of counting output terminals; The wake-up circuit includes a first diode; The output end of the first diode is connected to the enable input end; the input end of the first diode is connected to any counting output end of the counting chip.

4. The circuit according to claim 2, characterized in that The counting chip further comprises: a second input terminal; The timed wake-up circuit of the vehicle-mounted controller further includes: a reset circuit; The input end of the reset circuit is connected to the first output end of the vehicle-mounted controller; the output end of the reset circuit is connected to the second input end of the counting chip.

5. The circuit according to claim 4, characterized in that The reset circuit comprises: a first resistor, a second resistor, a third resistor and a triode; One end of the first resistor of the reset circuit is connected to the first output end of the vehicle controller; the other end of the first resistor is respectively connected to the input end of the transistor and one end of the second resistor; The other end of the second resistor is grounded; the first output end of the transistor is grounded; The second output end of the transistor is connected to one end of the third resistor and the second input end of the counting chip respectively.

6. The circuit according to claim 3, characterized in that The second output terminal of the vehicle-mounted controller is connected to a second diode; The output end of the second diode is connected to the output end of the first diode.

7. The circuit according to claim 3, characterized in that Different counting outputs correspond to different timed wake-up intervals; The number threshold is determined according to a timed wake-up interval corresponding to a counting output terminal connected to the input terminal of the first diode; The timing circuit is specifically used to control the timing pulse count to reach the number threshold so that the time interval for generating the wake-up signal is the timing wake-up interval.

8. The circuit according to claim 2, characterized in that The counting chip is a CD4060 chip.

9. The circuit according to claim 3, characterized in that The wake-up circuit also includes a third diode and a fourth diode; The input end of the third diode is connected to the ignition switch of the vehicle; the input end of the fourth diode is connected to the output end of the CAN transceiver of the vehicle; The wake-up circuit is an OR gate circuit composed of the first diode, the third diode and the fourth diode; the output end of the wake-up circuit is connected to the enable input end.

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