CN111231861A - A circuit and method for adjusting the timing period of a watchdog chip for an automatic driving system - Google Patents

Abstract

The application provides a circuit and a method for adjusting a watchdog chip timing period of an automatic driving system, wherein the circuit comprises the watchdog chip and a variable resistance module; the watchdog chip comprises a clock signal end; one end of the variable resistance module is electrically connected with the clock signal end, and the other end of the variable resistance module is electrically connected with the ground end, so that a variable clock signal is formed by adjusting the resistance value of the variable resistance module and is used as a variable timing period of the watchdog chip. Through the technical scheme of this application, can realize according to the practical application demand of autopilot system, the timing cycle of adjustment watchdog chip.

Description

A circuit for adjusting the timing period of a watchdog chip for an automatic driving system and method

technical field

The present application relates to the field of electronic technology, and in particular, to a circuit and method for adjusting the timing period of a watchdog chip for an automatic driving system.

Background technique

With the development of science and technology, self-driving cars have become an important development direction of future cars. Self-driving cars can not only ensure people's safe travel and comfortable experience, but also greatly improve the efficiency of people's travel. The chassis controller of an autonomous vehicle generally uses a microprocessor as the core control device. Therefore, the operating state of the microprocessor also affects the safety of autonomous vehicles.

When the microprocessor crashes, runs away, etc., restarting the microprocessor helps to ensure the safety of the self-driving car. Therefore, manufacturers of self-driving cars generally set up a watchdog chip to monitor the running status of the microprocessor. After the microprocessor crashes, the microprocessor will not clear the watchdog chip (commonly known as feeding the dog). When the timing period of the watchdog chip is exceeded, the watchdog chip will report to the microprocessor Send a reset signal to reset the microprocessor. At present, the timing period of the watchdog is fixed, and in the actual application of the automatic driving system, the required timing period cannot be adjusted according to the actual demand.

Therefore, a circuit and method for adjusting the timing period of the watchdog chip are required to solve the above technical problems.

SUMMARY OF THE INVENTION

The present application discloses a circuit and method for adjusting the timing period of a watchdog chip in an automatic driving system. The timing period of the watchdog chip is adjusted according to the actual application requirements of the automatic driving system.

One aspect of the present application provides a circuit for an automatic driving system that can adjust the timing period of a watchdog chip. The circuit includes a watchdog chip and a variable resistance module. The watchdog chip includes a clock signal terminal. One end of the variable resistance module is electrically connected to the clock signal terminal, and the other end of the variable resistance module is electrically connected to the ground terminal, so as to form a variable clock signal by adjusting the resistance value of the variable resistance module, As the watchdog chip variable timing period.

Another aspect of the present application provides a method for adjusting the timing period of a watchdog chip in an automatic driving system, which is applied to a circuit for adjusting the timing period of a watchdog chip in an automatic driving system. The circuit includes a watchdog chip, a variable resistor module; the method includes adjusting the resistance value of the variable resistance module to form a variable clock signal as the variable timing period of the watchdog chip.

Description of drawings

The following drawings describe in detail exemplary embodiments disclosed in this application. Where like reference numbers refer to similar structures throughout the several views of the drawings. Those of ordinary skill in the art will understand that these embodiments are non-limiting, exemplary embodiments, the accompanying drawings are for illustration and description purposes only, and are not intended to limit the scope of the application, and other embodiments are also possible The same accomplishes the inventive intent in this application. in:

1 is a schematic diagram of a circuit for an automatic driving system to adjust the timing cycle of a watchdog chip in the present application;

2A is a schematic diagram of a circuit used in the present application for an automatic driving system to adjust the timing cycle of a watchdog chip;

2B is a schematic diagram of a circuit used in the present application for an automatic driving system to adjust the timing cycle of a watchdog chip;

FIG. 3 is an exemplary flow chart of the present application for an automatic driving system to adjust the timing period of the watchdog chip.

Detailed ways

The present application discloses a circuit and method for adjusting the timing period of a watchdog chip in an automatic driving system. The timing period of the watchdog chip is adjusted according to the actual application requirements of the automatic driving system.

In the following detailed description, specific details of the present application are set forth by way of example in order to provide those of ordinary skill in the art with a thorough understanding of the relevant disclosure. However, the content disclosed in this application should be understood to be consistent with the protection scope of the claims, and not limited to the specific invention details. For example, various modifications to the embodiments disclosed in this application will be apparent to those of ordinary skill in the art; and those of ordinary skill in the art may define the definitions herein without departing from the spirit and scope of the present application. The general principles apply to other embodiments and applications. For another example, if these details are not disclosed below, those of ordinary skill in the art can also practice the present application without knowing these details. On the other hand, in order to avoid unnecessarily obscuring the content of the present application, the present application provides general overviews without detailed descriptions of well-known methods, procedures, systems, components and/or circuits. Accordingly, the disclosure of this application is not limited to the embodiments shown, but is to be accorded the scope of the claims.

The terminology used in this application is for the purpose of describing particular example embodiments only and is not limiting. For example, if the description of an element in this application is in the singular form (eg, "a", "an" and/or equivalents), the description may also include a plurality of the element, unless the context clearly dictates otherwise. The terms "comprising" and/or "comprising" as used in this application refer to open-ended concepts. For example, A includes/includes B only indicates the existence of B features in A, but does not exclude the possibility that other elements (such as C) exist or are added in A.

It should be understood that terms used in this application, such as "system", "unit", "module" and/or "block", are used to distinguish between different components, elements, parts, parts or assemblies at different levels a method. However, other terms may also be used in this application in place of the above terms if they serve the same purpose.

The modules (or units, blocks, units) described in this application may be implemented as software and/or hardware modules. Unless the context clearly dictates otherwise, when an element or module is described as being "connected to", "connected to" or "coupled to" another element or module, the expression may mean that the element or module is directly connected to, linked to Or being coupled to the other unit or module may also mean that the unit or module is indirectly connected, connected or coupled to the other unit or module in some form. In this application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this application, the terms "autonomous vehicle", "autonomous vehicle" may refer to the ability to perceive its environment and automatically perceive the external environment without human (eg, driver, pilot, etc.) input and/or intervention , judge and then make decisions. The terms "self-driving vehicle," "self-driving car," and "vehicle" are used interchangeably. The term "autopilot" may refer to the ability to make intelligent judgments about and navigate the surrounding environment without human (eg, driver, pilot, etc.) input.

These and other features of the present application, as well as the operation and function of related elements of structure, and the economics of assembly and manufacture of components, may be significantly improved in view of the following description. With reference to the accompanying drawings, all of which form a part of this application. It should be clearly understood, however, that the accompanying drawings are for illustration and description purposes only and are not intended to limit the scope of the present application. It should be understood that the figures are not drawn to scale.

The flow diagrams used in this application illustrate the operation of a system implementation according to some embodiments in this application. It should be clearly understood that the operations of the flowcharts may be implemented out of sequence. Instead, operations may be implemented in reverse order or simultaneously. Additionally, one or more other operations can be added to the flowchart. One or more operations can be removed from the flowchart.

In addition, although the circuits and methods in this application mainly describe the circuits and methods for adjusting the timing period of the watchdog chip in the automatic driving system, it should be understood that this is only an exemplary embodiment. The circuits or methods of the present application may be applied to any other type of system. For example, the systems or methods of the present application may be applied to transportation systems in different environments, including land, marine, aerospace, etc., or any combination thereof. Autonomous vehicles for transportation systems can include taxis, private cars, trailers, buses, trains, bullet trains, high-speed rail, subways, boats, airplanes, spacecraft, hot air balloons, unmanned vehicles, etc., or any combination thereof. In some embodiments, the system or method may find application in, for example, logistics warehouses, military affairs.

FIG. 1 is a schematic diagram of a circuit 100 for an automatic driving system to adjust the timing period of the watchdog chip 110 in the present application. The circuit 100 can be used for a chassis controller of an autonomous vehicle, and the chassis controller can include anti-lock brake control (ABS, Anti-lock Braking System), traction control (TCS, Traction Control System), direct yaw control One or more combinations of torque control (DYC, Direct Yaw Moment Control).

The circuit 100 may include a watchdog chip 110 , a variable resistance module 120 , and a ground terminal (GND terminal) 130 . The watchdog chip 110 includes a clock signal terminal 114 . The clock signal terminal 114 may form a corresponding clock signal as the timing period of the watchdog chip 110 . A resistor is connected to the clock signal terminal 114 of the watchdog chip 110 and the GND terminal of the ground terminal. The timing period is related to the resistance value of the resistor. For example, the timing period is positively correlated with the resistance value of the resistor, or negatively correlated with the resistance value of the resistor.

One end of the variable resistance module 120 is electrically connected to the clock signal terminal 114 , and the other end of the variable resistance module 120 is electrically connected to the GND terminal 130 . In some embodiments, the GND terminal 130 may include one or more ground terminals. For example, as shown in FIG. 1 , the GND terminal includes a plurality of ground terminals 130-1, 130-2, . . . , 130-3. The other end of the variable resistance module 120 may be electrically connected to one or more of the GND terminals 130-1, 130-2, . . . , 130-3.

The circuit 100 may further include a microprocessor 140 . In some embodiments, the microprocessor 140 may include one or more hardware processors, such as microcontrollers, reduced instruction set computers (RISCs), application specific integrated circuits (ASICs), application-specific instruction-set processing Processor (ASIP), Central Processing Unit (CPU), Graphics Processing Unit (GPU), Physical Processing Unit (PPU), Microcontroller Unit, Digital Signal Processor (DSP), Advanced RISC Machine (ARM), Programmable Logic Device (PLD), any circuit or processor, etc., capable of performing one or more functions, or any combination thereof.

For illustrative purposes only, only one microprocessor is depicted in the circuit 100 described in this application. However, it should be noted that the circuit 100 in this application may also include multiple microprocessors, and thus, the operations and/or method steps disclosed in this application may be performed by one microprocessor as described in this application , can also be executed jointly by multiple microprocessors. For example, if the microprocessor 140 of the circuit 100 performs steps A and B in the present application, it should be understood that steps A and B may also be performed jointly or separately by two different processors in information processing (eg, step A and step B) A processor performs step A, a second processor performs step B, or the first and second processors perform steps A and B) together.

The microprocessor 140 may include a reset input 141, one or more input/outputs (eg, input/outputs 142, 143, . . . , 146). The watchdog chip 110 may include a reset output terminal 111 , a Wake terminal 112 , and a Done terminal 113 . The reset output terminal 111 is electrically connected to the reset output terminal 141 . In some embodiments, the Wake terminal 112 is electrically connected to one or more of the input/output terminals 142 , 143 , . . . , 146 . For example, as shown in FIG. 1 , the Wake terminal 112 is electrically connected to the input/output terminal 142 . In some embodiments, the Done terminal 113 is electrically connected to one or more of the input/output terminals 142 , 143 , . . . , 146 . For example, as shown in FIG. 1 , the Done terminal 113 is electrically connected to the input/output terminal 143 .

As shown in FIG. 1 , the watchdog chip 110 monitors the working state of the microprocessor 140 . When the microprocessor 140 operates normally, the microprocessor 140 periodically sends out signals through the input/output terminal 142 . In some embodiments, the watchdog chip 110 maintains the reset output if the watchdog chip 110 receives a signal from the input/output 142 within its timing period at the Wake terminal 112 The level of 111 remains unchanged, and at the same time, a confirmation signal is sent from the Done terminal 113 to the input/output terminal 143 of the microprocessor 140 to confirm that the signal from the input/output terminal 141 is received. The timing period may be associated with the resistance value of the variable resistance module 120 . When the input/output terminal 143 receives the signal sent from the Done terminal 113, the microprocessor 140 continues to operate.

If the operating state of the microprocessor 140 is abnormal, the microprocessor 140 cannot send a signal through the input/output terminal 142 . In some embodiments, the abnormal working state includes one or more abnormal conditions such as the microprocessor 140 crashing and running away. If the Wake terminal 112 does not receive a signal from the input/output terminal 142 within the timing period of the watchdog chip 110 , the watchdog chip 110 sends a signal through the reset output terminal 111 to the reset input 141. In some embodiments, after the reset input 141 receives a signal, the microprocessor 140 can be restarted and/or reset.

The variable resistance module 120 may include one or more resistors, and/or one or more switches. In some embodiments, one end of the resistor may be electrically connected to the clock signal terminal, and the other end of the resistor may be electrically connected to the GND terminal. As shown in FIG. 1 , one end 1211 of the resistor 121 can be electrically connected to the clock signal terminal 114, and the other end 1212 of the resistor 121 can be electrically connected to the GND terminal 130-1. In some embodiments, the resistors in the variable resistance module 120 may be connected in parallel, may also be connected in series, or may be connected in a series/parallel hybrid manner.

In some embodiments, the resistor may be further electrically connected to the switch. In some embodiments, the switch may electrically connect the resistor and the GND terminal. As shown in FIG. 1 , the clock signal terminal 114 can be electrically connected to one terminal 1231 of the resistor 123 , and the other terminal 1232 of the resistor 123 can be electrically connected to the first connection terminal 1221 of the switch 122 . The second connection terminal 1222 of the GND terminal is electrically connected to the GND terminal 130-2. In some embodiments, the switch may electrically connect the clock signal terminal and the resistor. As shown in FIG. 2A , the first connection section 2241 of the switch 224 may be electrically connected to the clock signal terminal 114 , and the second connection terminal 2242 of the switch 224 may be electrically connected to one end 2251 of the resistor 225 .

In some embodiments, the resistors may include carbon film resistors, metal oxide film resistors, precision resistors, wire wound resistors, cement resistors, fixed porcelain tube resistors, low-sensitivity porcelain tube resistors, aluminum shell precision resistors, photoresistors, thermal Varistor, Varistor, etc., any circuit or electronic component, etc., capable of implementing one or more obstructions to the passage of current, or any combination thereof. The resistance values of the resistors may be the same, partially the same, or different. For example, the resistance values of the resistors 121 and 125 shown in FIG. 1 are the same, and the resistance values of the resistors 123 and the resistors 121 and 125 are different. For another example, the resistance values of the resistor 121 , the resistor 123 , and the resistor 125 are different. For another example, the resistance values of the resistor 121 , the resistor 123 , and the resistor 125 are the same. For illustration purposes only, the circuit described in this application describes only 3 resistors. However, it should be noted that the circuits described in this application may also include 4 resistors, 5 resistors, . . . , N resistors, etc., thus, the operations and/or method steps disclosed in this application It can be performed by one resistor or by a combination of multiple resistors.

In some embodiments, the switches may include, but are not limited to, capacitive switches, resistive switches, piezoelectric switches, photo-interrupting switches, reed switches, Hall switches, relays, triodes, MOS transistors, etc., capable of performing one of or Multiple electronic components that open circuits, interrupt or flow current to other circuits, or any combination thereof. For illustration purposes only, the circuit described in this application describes only 2 switches, 3 switches. However, it should be noted that the circuits described in this application may also include 4 switches, 5 switches, . . . , N switches, etc., thus the operations and/or method steps disclosed in this application It can be performed by one switch or by a combination of multiple switches.

The resistance value of the variable resistance module 120 can be further adjusted. In some embodiments, the resistance value of the variable resistance module 120 can be adjusted by controlling the closing and/or opening of the switch. In some embodiments, according to the adjustable resistance value, the clock signal terminal 114 forms a variable clock signal to the GND terminal. In some embodiments, the variable clock signal forms a variable timing period of the watchdog chip 110 .

In some embodiments, the switch further includes a control terminal that can control closing and/or opening of the switch. In some embodiments, the control terminal may be electrically connected to the input/output terminal. For example, after the microprocessor is started, according to the actual requirements of the system, the microprocessor can output a corresponding signal to the control end of the switch through the input/output end, and the switch determines that the switch is closed and/or according to the signal. disconnection, thereby changing the resistance value of the variable resistance module, and further, the timing period of the watchdog chip is also changed accordingly. In some embodiments, the variable resistance module includes a fixed connection resistor and one or more on/off resistors. The on/off resistor is further connected to a switch. For example, the variable resistance module 120 of FIG. 1 includes a fixed connection resistor 121 , and resistors 123 and 125 that can be closed/disconnected. In some embodiments, the variable resistance module includes one or more on/off resistors. For example, the variable resistance module 220 of FIG. 2A includes on/off resistors 221 , 223 and 225 .

The actual requirements of the system may include, but are not limited to, the actual requirements of one or more systems, such as low power consumption mode, system security mode, and vehicle model matching mode, and combinations thereof. The low power consumption mode may include, but is not limited to, the automatic driving system entering one or more states where no substantial work is required, such as standby, hibernation, sleep, and shutdown. In some embodiments, the microprocessor will determine the timing period of the low power consumption mode according to the frequency at which the microprocessor is woken up, and output a corresponding signal to the switch. For example, as shown in FIG. 1 , the variable resistance module 120 includes a resistance 121 , a resistance 123 and a resistance 125 . The resistor 121 may be a resistor fixedly connected to the watchdog chip 114 and the GND terminal, the resistor 123 may be electrically connected to the switch 122 , and the resistor 125 may be electrically connected to the switch 124 .

When the switch 122 and the switch 124 are turned off, the resistance value of the variable resistance module 120 is the resistance value of the resistor 121 , which corresponds to the first timing period of the watchdog chip. For example, the timing period corresponding to the resistor 121 is 8 hours. When the microprocessor is in a dormant state for a long time, such as when the driver leaves the car and the self-driving car is parked for a long time, the autopilot system adjusts the state of the microprocessor to sleep to reduce the power consumption of the vehicle battery. The microprocessor shuts down most of the unnecessary operations in the sleep state, and only keeps the output level including the input/output interface 141 at a very low frequency. At this time, if the timing period of the watchdog chip is relatively short, the microprocessor will be forced to wake up from time to time so as to output the level from the input/output terminal 141 within the timing period of the watchdog chip. If the timing period of the watchdog chip is adjusted to every 8 hours, the microprocessor only needs to output a level through the input/output terminal 142 once within 8 hours during sleep.

When the switch 122 is closed, the resistance value of the variable resistance module 120 is the resistance value of the resistor 121 and the resistor 123 in parallel, which corresponds to the second timing period of the watchdog chip. For example, the timing period corresponding to the resistor 121 is 2 hours, and the microprocessor 140 only needs to send a level signal to the watchdog chip from the input/output terminal 141 every 2 hours.

When the switch 142 is closed, the resistance value of the variable resistance module 120 includes the resistance value of the resistor 121 and the resistor 125 in parallel, which corresponds to the third timing period of the watchdog chip. For example, the timing period corresponding to the resistor 121 is 1 hour, and the microprocessor 140 can avoid being restarted by sending a level signal to the watchdog chip through the input/output terminal 141 every 1 hour.

Similarly, when the switch 122 and the switch 124 are closed, the resistance value of the variable resistance module 120 includes the resistance value after the resistance 121 , the resistance 123 and the resistance 125 are connected in parallel, which corresponds to the fourth timing period of the watchdog chip. For example, the timing period corresponding to the resistor 121 is 10 minutes.

In some embodiments, when the autopilot system goes to sleep, the system may require the microprocessor to be woken up once every 2 hours and then close the switch 122 . In some embodiments, when the autonomous driving system goes to sleep, the system may require the microprocessor to be woken up every 8 hours, and then switch 122 and switch 124 are opened. It should be noted that the value of the variable timing period in this application includes but is not limited to 10 minutes, 1 hour, 2 hours and 8 hours, and the value of the variable timing period may also include Various values related to system and/or circuit requirements.

The system safety mode may include one or more states, such as road conditions, weather, and environment, that may affect the driving safety of the autonomous vehicle. In some embodiments, the microprocessor 140 can send a closing signal to the control terminal 1223 of the switch 122 through the input/output terminal 145 to close the switch 122. The resistance value of the variable resistance module 120 includes the resistance 121 and The resistance value of the resistors 123 in parallel. In some embodiments, the microprocessor 140 can also send a closing signal to the control terminal 1243 of the switch 124 through the input/output terminal 144 to close the switch 124 , and the resistance value of the variable resistance module 120 includes the resistance 121 The resistance value after being connected in parallel with the resistor 125. In some embodiments, the microprocessor 140 may send a closing signal to the control terminals 1223 and 1243 corresponding to the switches 122 and 124 through the input/output terminals 145 and 144, respectively, to close the switches 122 and 124, and the variable resistor The resistance value of the module 120 includes the total resistance value of the resistor 121 , the resistor 123 , and the resistor 125 in parallel.

In some embodiments, the self-driving vehicle is driving on a busy road section or a high speed in an urban area, and the higher the vehicle speed, the shorter the timing period may be. For example, as shown in FIG. 1, the timing period corresponding to the resistor 121 is 1s. If the speed of the autonomous vehicle is 36km/h, if the chip crashes or runs away within this 1s period, the Autonomous vehicles can travel a maximum distance of 10m that may be uncontrolled. Within this 10m distance, if the self-driving vehicle deviates on the road, it may cause a major traffic accident. In some embodiments, in order to shorten the uncontrolled driving distance, the timing period of the watchdog chip needs to be adjusted according to the driving speed of the autonomous vehicle. The higher the driving speed, the shorter the timing period. The shorter the timing period, the shorter the time for the system to restart the microprocessor 140 after the microprocessor 140 crashes or runs away. Therefore, the microprocessor 140 needs to send a corresponding closing signal to the switches 122 and/or 124 according to the corresponding speed, and further close the switches 122 and/or 124 to adjust the timing period of the watchdog chip.

The vehicle model matching mode may include working states of different timing periods required for different vehicle models. The different vehicle models may include, but are not limited to, miniature cars, small cars, compact cars, medium cars, medium and large cars, large cars, SUVs, MPVs, and the like. In some embodiments, the hardware of the microprocessor is fixed. When the microprocessor matches different vehicle models, the timing cycles of the watchdog chip may be different. For example, as shown in FIG. 2A , the variable resistance module 220 includes a resistance 221 , a resistance 223 and a resistance 225 . The resistor 221 can be electrically connected to the switch 226 , the resistor 223 can be electrically connected to the switch 222 , and the resistor 225 can be electrically connected to the switch 224 . When the microprocessor needs to match the small car, the medium car and the SUV, the resistor 221 , the resistor 223 and the resistor 225 may correspond to the timing period of the watchdog chip 110 of the small car, the medium car and the SUV, respectively. It should be noted that the resistors described in this application can correspond to the timing cycles of watchdog chips of different models; the resistors can also include, but are not limited to, some resistors corresponding to the timing cycles of watchdog chips of different models. , some of the resistors correspond to the timing period required by the low power consumption mode, and some of the resistors correspond to one or more combinations of the system security mode.

The above variable resistance modules are all formed by connecting different resistors in parallel. In some embodiments, the variable resistance module may also be formed of several resistors in series, or a mixture of them in parallel and series. FIG. 2B is a schematic diagram of a circuit used in the present application for an automatic driving system to adjust the timing period of a watchdog chip. The variable resistance module 220A is formed of three resistors connected in series, and two resistors are connected in parallel with a switch. The control terminals of the switches are controlled by the microprocessor 140 through the input/output terminals 144 and 145, respectively. Connecting one or more of the switches can control whether the corresponding resistance is connected to the variable resistance module, thereby affecting the resistance value of the variable resistance module 220A.

FIG. 3 is an exemplary flow chart of the present application for an automatic driving system to adjust the timing period of the watchdog chip. The microprocessor 140 adjusts the timing period of the watchdog chip 110 according to the actual application requirements of the automatic driving system.

In 310, the microprocessor 140 adjusts the resistance value of the variable resistance module according to the actual application requirements of the automatic driving system. In some embodiments, the microprocessor 140 sends a closing and/or opening signal through the input/output terminal, and the variable resistance module closes and/or opens the corresponding switch according to the received closing and/or opening signal. The practical application requirements include but are not limited to one or more practical requirements such as low power consumption mode, system security mode, and vehicle model matching mode, and combinations thereof.

In 320, the timing period of the watchdog chip 110 is formed according to the resistance value of the variable resistance module. In some embodiments, one end of the variable resistance module is electrically connected to the clock signal terminal 114 of the watchdog chip 110 , and the other end of the variable resistance module is electrically connected to the GND terminal. The resistance value of the variable resistance module between the clock signal terminal 114 and the GND terminal forms a corresponding clock signal, which can be used as the timing period of the watchdog chip 110 .

In conclusion, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented by way of example only, and may not be limiting. Although not explicitly described herein, it will be understood by those skilled in the art that this application is intended to cover various reasonable changes, improvements and modifications to the embodiments. Such changes, improvements and modifications are intended to be suggested by this application and are within the spirit and scope of the exemplary embodiments of this application.

Additionally, certain terms in this application have been used to describe embodiments of this application. For example, "one embodiment," "an embodiment," and/or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Thus, it is emphasized and should be understood that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various parts of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined as appropriate in one or more embodiments of the present application.

It should be understood that, in the foregoing description of embodiments of the present application, in order to assist in understanding one feature, the present application sometimes groups various features in a single embodiment, drawings or description thereof for the purpose of simplifying the application. Alternatively, the present application in turn disperses various features across multiple embodiments of the present application. However, this does not mean that the combination of these features is necessary, and it is entirely possible for those skilled in the art to extract some of the features as a separate embodiment to understand when reading this application. That is to say, the embodiments in this application can also be understood as the integration of multiple sub-embodiments. It is also true that each sub-embodiment contains less than all features of a single foregoing disclosed embodiment.

In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the present application should be understood to be modified in certain instances by the terms "about," "approximately," or "substantially." For example, unless stated otherwise, "about", "approximately" or "substantially" may mean a ±20% variation of the value it describes. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be interpreted in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth broad ranges of the present application are approximations, the numerical values set forth in the specific examples are as precise as possible.

Each patent, patent application, publication of a patent application, and other materials, such as articles, books, specifications, publications, documents, articles, etc., cited herein, may be incorporated herein by reference. For all purposes in its entirety, except any filing history with which it relates, any identical filing that may be inconsistent or conflicting with this document, or any identical filing that may have a limiting effect on the broadest scope of the claims history. associated with this document now or in the future. For example, in the event of any inconsistency or conflict between the descriptions, definitions, and/or use of terms, descriptions, definitions, and/or terms associated with any of the included materials, use The term shall prevail.

Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed in this application are merely illustrative and not limiting. Those skilled in the art may adopt alternative configurations according to the embodiments in the present application to implement the inventions in the present application. Accordingly, the embodiments of the present application are not limited to which embodiments are precisely described in the application.

Claims (10)

1. A circuit for an autopilot system to adjust the timing cycle of a watchdog chip, the circuit comprising:

the watchdog chip comprises a clock signal end;

and one end of the variable resistance module is electrically connected with the clock signal end, and the other end of the variable resistance module is electrically connected with a ground end (GND end), so that a variable clock signal is formed by adjusting the resistance value of the variable resistance module and is used as a variable timing period of the watchdog chip.

2. The circuit of claim 1, further comprising:

a microprocessor including a first input/output terminal.

3. The circuit of claim 2, wherein:

the variable resistance module further comprises a first switch, a first resistor and a second resistor;

the first switch comprises a first connecting end, a second connecting end and a control end.

4. The circuit of claim 3, wherein:

one end of the first resistor is electrically connected with the clock signal end, and the other end of the first resistor is electrically connected with the GND end;

the control end of the first switch is electrically connected with the first input/output end, and one of the first connection end or the second connection end of the first switch is electrically connected with one end of the second resistor;

the first input/output terminal is configured to control the first switch to close.

5. The circuit according to claim 4, wherein the other end of the second resistor is electrically connected to a GND terminal.

6. The circuit of claim 4, wherein the other end of the second resistor is electrically connected to the clock signal terminal.

7. The circuit of claim 4, wherein:

the first switch is closed, and the first resistor and the second resistor are electrically connected in parallel.

8. The circuit of claim 4, wherein:

the first switch is closed, and the first resistor and the second resistor are electrically connected in series.

9. A method for adjusting the timing period of a watchdog chip of an automatic driving system is applied to a circuit for adjusting the timing period of the watchdog chip of the automatic driving system, and the circuit comprises: a watchdog chip and a variable resistance module;

characterized in that the method comprises:

and forming a variable clock signal as a variable timing period of the watchdog chip by adjusting the resistance value of the variable resistance module.

10. The method of claim 9, by adjusting a resistance value of the variable resistance module, characterized by:

the circuit further includes a microprocessor configured to adjust a resistance value of the variable resistance module.

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