CN111231861A

CN111231861A - Circuit and method for adjusting watchdog chip timing period of automatic driving system

Info

Publication number: CN111231861A
Application number: CN201811441593.XA
Authority: CN
Inventors: 赵政鑫; 罗赛; 王勃
Original assignee: Uisee Technologies Beijing Co Ltd
Current assignee: Uisee Technologies Beijing Co Ltd
Priority date: 2018-11-29
Filing date: 2018-11-29
Publication date: 2020-06-05

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

Circuit and method for adjusting watchdog chip timing period of automatic driving system

Technical Field

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

Background

With the development of science and technology, the automatic driving automobile becomes an important development direction of the future automobile. The automatic driving automobile can not only ensure safe traveling and comfortable experience of people, but also greatly improve the traveling efficiency of people. The chassis controller of an autonomous vehicle typically employs a microprocessor as a core control device. Therefore, the operating state of the microprocessor also affects the safety of the autonomous vehicle.

When the microprocessor crashes, runs, and the like, restarting the microprocessor is helpful to ensure the safety of the automatic driving automobile. Therefore, manufacturers of autonomous vehicles typically set watchdog chips to monitor the operating status of the microprocessors. After the microprocessor crashes, the microprocessor can not reset the watchdog chip (commonly called feeding dog), and when the timing period of the watchdog chip is exceeded, the watchdog chip can send a reset signal to the microprocessor so that the microprocessor resets. At present, the timing period of the watchdog is fixed, and in the practical application of the automatic driving system, the required timing period cannot be adjusted according to the actual requirement.

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

Disclosure of Invention

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

One aspect of the present application provides a circuit for an adjustable watchdog chip timing period of an autopilot system, the circuit comprising a watchdog chip, a variable resistance module. The watchdog chip comprises a clock signal terminal. 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.

The application also provides an adjusting method for the timing period of the watchdog chip of the automatic driving system, which is applied to a circuit for adjusting the timing period of the watchdog chip of the automatic driving system, wherein the circuit comprises the watchdog chip and a variable resistance module; the method comprises the step of forming a variable clock signal as a variable timing period of the watchdog chip by adjusting the resistance value of the variable resistance module.

Drawings

The following drawings describe in detail exemplary embodiments disclosed in the present application. Wherein like reference numerals represent similar structures throughout the several views of the drawings. Those of ordinary skill in the art will understand that the present embodiments are non-limiting, exemplary embodiments and that the accompanying drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of the present application, as other embodiments may equally fulfill the inventive intent of the present application. Wherein:

FIG. 1 is a schematic diagram of a circuit for an autopilot system adjusting the timing period of a watchdog chip in the present application;

FIG. 2A is a schematic diagram of a circuit for an autopilot system adjusting the timing period of a watchdog chip in the present application;

FIG. 2B is a schematic diagram of a circuit for an autopilot system adjusting the timing period of a watchdog chip in the present application;

fig. 3 is an exemplary flow chart for an autopilot system adjusting watchdog chip timing period in the present application.

Detailed Description

In the following detailed description, specific details of the application are set forth by way of examples in order to provide a thorough understanding of the relevant disclosure to those of ordinary skill in the art. However, the disclosure should be understood to be consistent with the scope of the claims and not limited to the specific inventive details. For example, various modifications to the embodiments disclosed herein will be readily apparent to those skilled in the art; and those skilled in the art may now apply the general principles defined herein to other embodiments and applications without departing from the spirit and scope of the present application. For another example, it will be apparent to one skilled in the art that the present application may be practiced without these specific details. In other instances, well known methods, procedures, systems, components, and/or circuits have been described in general terms, but not in detail so as not to unnecessarily obscure aspects of the present application. Accordingly, the disclosure is not limited to the illustrated embodiments, but is consistent with the scope of the claims.

The terminology used in the description presented herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. For example, if a claim element is referred to in this application as "comprising" a "," an "and/or" the equivalent thereof, the claim element may include a plurality of the claim element unless the context clearly dictates otherwise. The terms "including" and/or "comprising" as used in this application refer to the open-ended concept. For example, the inclusion of B in a merely indicates the presence of B in a, but does not exclude the possibility that other elements (such as C) may be present or added to a.

It is to be understood that terms such as "system," "unit," "module," and/or "block" used herein are a means for distinguishing between different components, elements, components, parts, or assemblies at different levels. However, other terms may be used in the present application instead of the above terms if they can achieve 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 indicates otherwise, when a unit or module is described as being "on," "connected to," or "coupled to" another unit or module, the expression may mean that the unit or module is directly on, linked or coupled to the other unit or module, or that the unit or module is indirectly on, connected or coupled to the other unit or module in some way. 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 automobile," and "autonomous vehicle" may refer to a vehicle that is capable of sensing its environment and automatically sensing, determining, and making decisions about the external environment without human (e.g., driver, pilot, etc.) input and/or intervention. The terms "autonomous vehicle", "autonomous automobile" and "vehicle" may be used interchangeably. The term "autopilot" may refer to the ability to intelligently judge and navigate the surrounding environment without human (e.g., driver, pilot, etc.) input.

These and other features of the present application, as well as the operation and function of the related elements of structure and the combination of parts and economies of manufacture, may be significantly improved upon consideration of the following description. All of which form a part of this application, with reference to the accompanying drawings. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the application. It should be understood that the drawings are not to scale.

The flow charts used in this application illustrate the operation of system implementations according to some embodiments of the present application. It should be clearly understood that the operations of the flow diagrams may be performed out of order. Rather, the operations may be performed in reverse order or simultaneously. In addition, one or more other operations may be added to the flowchart. One or more operations may be removed from the flowchart.

Further, while the circuits and methods herein are described primarily in relation to circuits and methods for adjusting watchdog chip timing periods with respect to an autopilot system, it should be understood that this is merely 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 terrestrial, marine, aerospace, etc., or any combination thereof. The autonomous vehicles of the transportation system may include taxis, private cars, trailers, buses, trains, bullet trains, high speed railways, subways, ships, airplanes, space vehicles, hot air balloons, unmanned vehicles, and the like, 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 autopilot system to adjust the timing period of a watchdog chip 110 according to the present application. The circuit 100 may be used as a chassis controller of an autonomous vehicle, and the chassis controller may include one or more combinations of Anti-lock Braking System (ABS), Traction Control System (TCS), Direct Yaw Moment Control (DYC), and the like.

The circuit 100 may include a watchdog chip 110, a variable resistance block 120, and a Ground (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 a timing cycle of the watchdog chip 110. The clock signal terminal 114 of the watchdog chip 110 is connected with a resistor to the ground terminal GND. The timing period is related to the resistance of the resistor. For example, the timing period is positively correlated with the resistance of the resistor, or negatively correlated with the resistance 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, such as shown in fig. 1, including a plurality of ground terminals 130-1, 130-2. 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.

The circuit 100 further may include a microprocessor 140. In some embodiments, the microprocessor 140 may include one or more hardware processors, such as microcontrollers, Reduced Instruction Set Computers (RISC), Application Specific Integrated Circuits (ASIC), application specific instruction-set processors (ASIP), Central Processing Units (CPU), Graphics Processing Units (GPU), Physical Processing Units (PPU), microcontroller units, Digital Signal Processors (DSP), Advanced RISC Machines (ARM), Programmable Logic Devices (PLD), any circuit or processor capable of executing one or more functions, and the like, or any combination thereof.

For illustrative purposes only, only one microprocessor is depicted in the circuit 100 in the present application. It should be noted, however, that the circuit 100 may also include multiple microprocessors, and thus, the operations and/or method steps disclosed herein may be performed by one microprocessor as described herein, or by a combination of multiple microprocessors. For example, if in the present application the microprocessor 140 of the circuit 100 performs steps a and B, it should be understood that steps a and B may also be performed by two different processors in the information processing, either jointly or separately (e.g., a first processor performing step a, a second processor performing step B, or both a first and a second processor performing steps a and B).

The microprocessor 140 may include a reset input 141, one or more input/outputs (e.g., input/

outputs

142, 143...., 146). The watchdog chip 110 may include a reset output 111, a Wake terminal 112, and a Done terminal 113. The reset output 111 is electrically connected to the reset output 141. In some embodiments, the Wake port 112 is electrically connected to one or more of the input/

output ports

142, 143. 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. 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 operational status of the microprocessor 140. When the operating state of the microprocessor 140 is normal, the microprocessor 140 periodically sends a signal through the input/output terminal 142. In some embodiments, if the watchdog chip 110 receives a signal from the input/output 142 at the point Wake 112 within a timing period, the watchdog chip 110 keeps the reset output 111 at a constant level, and simultaneously sends an acknowledge signal from the Done 113 to the input/output 143 of the microprocessor 140 to acknowledge the signal from the input/output 141. The timing period may be associated with a resistance value of the variable resistance module 120. When the input/output terminal 143 receives the signal from the Done terminal 113, the microprocessor 140 continues to operate.

If the microprocessor 140 is in an abnormal operating state, the microprocessor 140 cannot send a signal through the input/output terminal 142. In some embodiments, the abnormal operation status includes one or more abnormal situations such as a crash, a flight, etc. of the microprocessor 140. If the Wake-up terminal 112 does not receive the signal from the input/output terminal 142 during the timing period of the watchdog chip 110, the watchdog chip 110 sends a signal to the reset input terminal 141 through the reset output terminal 111. In some embodiments, the microprocessor 140 may be reset and/or reset upon receipt of a signal at the reset input 141.

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 may be electrically connected to the clock signal terminal 114, and the other end 1212 of the resistor 121 may be electrically connected to the GND terminal 130-1. In some embodiments, the resistors in the variable resistor module 120 may be connected in parallel, in series, or in a mixed series/parallel 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 may be electrically connected to one terminal 1231 of the resistor 123, and the other terminal 1232 of the resistor 123 may be electrically connected to the first connection terminal 1221 of the switch 122 and the second connection terminal 1222 of the switch 122 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 segment 2241 of the switch 224 may be electrically connected to the clock signal terminal 114, and the second connection segment 2242 of the switch 224 may be electrically connected to the 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 ceramic tube resistors, low inductance ceramic tube resistors, aluminum case precision resistors, photo resistors, thermistors, piezoresistors, and the like, any circuit or electronic component capable of performing one or more blocking capabilities to the passage of electrical current, and the like, or any combination thereof. The resistance values of the resistors can be the same, partially the same or different. For example, the

resistors

121 and 125 shown in fig. 1 have the same resistance, and the resistor 123 has a different resistance from the

resistors

121 and 125. For another example, the resistances of the

resistors

121, 123, and 125 are different. For another example, the resistances of the

resistors

121, 123, and 125 are the same. For illustrative purposes only, the circuit described in this application describes only 3 resistors. It should be noted, however, that the circuit described herein may also include 4 resistors, 5 resistors, N resistors, etc., and thus, the operations and/or method steps disclosed herein may be performed by one resistor or a combination of resistors.

In some embodiments, the switches may include, but are not limited to, capacitive switches, resistive switches, piezoelectric switches, photo interrupter switches, reed switches, hall switches, relays, transistors, MOS transistors, etc., electronic elements capable of performing one or more of opening a circuit, interrupting a current, or flowing it to other circuits, or any combination thereof. For illustrative purposes only, the circuit described in this application only describes 2 switches, 3 switches. It should be noted, however, that the circuit described herein may also include 4 switches, 5 switches, N switches, etc., and thus, the operations and/or method steps disclosed herein may be performed by one switch or may be performed by a combination of 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 may be adjusted by controlling the closing and/or opening of the switch. In some embodiments, the clock signal terminal 114 forms a variable clock signal to the GND terminal according to an adjustable resistance value. In some embodiments, the variable clock signal forms a variable timing period for the watchdog chip 110.

In some embodiments, the switch further comprises a control terminal, which may control the 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 may output a corresponding signal to the control terminal of the switch through the input/output terminal, and the switch determines the switch to be turned on and/or off according to the signal, so as to change 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, one or more resistors that can be closed/opened. The closable/openable 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/opened. In some embodiments, the variable resistance module includes one or more closable/openable resistances. For example, the variable resistance module 220 of fig. 2A includes

resistors

221, 223, and 225 that can be closed/opened.

The actual requirements of the system may include, but are not limited to, one or more of the actual requirements of the system, such as a low power consumption mode, a system security mode, a vehicle model matching mode, and the like, and combinations thereof. The low power mode may include, but is not limited to, the automatic driving system entering one or more states of no substantial operation, such as standby, hibernation, sleep, shut down, etc. In some embodiments, the microprocessor will determine the timing period of the low power mode according to the frequency of waking up the microprocessor, and output a corresponding signal to the switch. For example, as shown in fig. 1, variable resistance module 120 includes a resistor 121, a resistor 123, and a resistor 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

switches

122 and 124 are turned off, the resistance of the variable resistance module 120 is the resistance of the resistor 121, which corresponds to the first timing period of the watchdog chip. For example, resistor 121 corresponds to a timing period of 8 hours. When the microprocessor is in the dormant state for a long time, for example, when a driver leaves the automobile and the automatic driving automobile is in the parking state for a long time, the state of the microprocessor is switched to the dormant state by the automatic driving system so as to reduce the electric quantity consumption of the vehicle-mounted 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 low frequency. At this time, if the timing period of the watchdog chip is short, the microprocessor is forced to wake up from time to output a level from the input/output terminal 141 during 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 142 once in 8 hours during sleep.

When the switch 122 is closed, the resistance of the variable resistance module 120 is the resistance after the resistor 121 and the resistor 123 are connected 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 of the variable resistance module 120 includes the resistance after the resistor 121 and the resistor 125 are connected 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 sends a level signal to the watchdog chip through the input/output terminal 141 every 1 hour to avoid being restarted.

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

In some embodiments, when the autopilot system goes to sleep, the system may require that the microprocessor be awakened every 2 hours, and switch 122 is closed. In some embodiments, when the autopilot system goes to sleep, the system may require that the microprocessor be awakened every 8 hours, opening switch 122 and switch 124. It is noted that the variable timing period values described herein include, but are not limited to, 10 minutes, 1 hour, 2 hours, and 8 hours, and may include various values related to system and/or circuit requirements.

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

resistors

121, 123 and 125 are connected in parallel.

In some embodiments, the autonomous vehicle travels on busy urban road segments or at high speeds, the higher the vehicle speed, the shorter the timing period may be. For example, as shown in fig. 1, the timing cycle corresponding to the resistor 121 is 1s, and if the speed of the autonomous vehicle is 36km/h, if the unprocessed chip is halted or runs away in the 1s and other cycles, the maximum driving distance of 10m of the autonomous vehicle may be uncontrolled. Within this 10m distance, if the autonomous vehicle deviates on a highway, a significant traffic accident may be caused. In some embodiments, to reduce uncontrolled travel distances, the timing cycle of the watchdog chip needs to be adjusted according to the travel speed of the autonomous vehicle. The higher the travel speed, the shorter the timing period needs to be, and the shorter the timing period, the shorter the time the microprocessor 140 will die or run away before the system responds to a reset of the microprocessor 140. Therefore, the microprocessor 140 needs to send corresponding closing signals 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 model matching pattern may include operating states for different timing cycles required for different models of vehicles. The different vehicle types may include, but are not limited to, miniature vehicles, small-sized vehicles, compact vehicles, medium-sized vehicles, large-sized vehicles, SUVs, MPVs, and the like. In some embodiments, the hardware of the microprocessor is fixed. When the microprocessor is matched with different vehicle models, the timing period of the watchdog chip can be different. For example, as shown in fig. 2A, variable resistance module 220 includes a resistor 221, a resistor 223, and a resistor 225. The resistor 221 may be electrically connected to the switch 226, the resistor 223 may be electrically connected to the switch 222, and the resistor 225 may be electrically connected to the switch 224. When the microprocessor needs to match the small, medium and SUVs, the

resistors

221, 223 and 225 may correspond to the timing periods of the watchdog chips 110 of the small, medium and SUVs, respectively. It should be noted that the resistor described in the present application may correspond to timing cycles of watchdog chips of different vehicle types; the resistors can also include, but are not limited to, one or more combinations of partial resistors corresponding to timing periods of watchdog chips of different vehicle types, partial resistors corresponding to timing periods required by a low power consumption mode, partial resistors corresponding to a system safety mode, and the like.

The variable resistance modules are formed by connecting different resistors in parallel. In some embodiments, the variable resistance module may also be formed by connecting several resistors in series, or by mixing the resistors in parallel and series. Fig. 2B is a schematic diagram of a circuit for an autopilot system adjusting the timing period of a watchdog chip in the present application. The variable resistor module 220A is formed by connecting three resistors in series, wherein two resistors are respectively connected in parallel with a switch. The control terminals of the switches are controlled by the microprocessor 140 via input/

output terminals

144 and 145, respectively. One or more of the switches may be enabled to control whether the corresponding resistor is connected to the variable resistor module, thereby affecting the resistance of the variable resistor module 220A.

Fig. 3 is an exemplary flow chart for an autopilot system adjusting watchdog chip timing period in the present application. The microprocessor 140 adjusts the timing period of the watchdog chip 110 according to the actual application requirements of the autopilot system.

At 310, the microprocessor 140 adjusts the resistance of the variable resistance module according to the actual application requirements of the autopilot system. In some embodiments, the microprocessor 140 sends a close and/or open signal through the input/output terminals, and the variable resistance module closes and/or opens the corresponding switch according to the received close and/or open signal. The actual application requirements include but are not limited to one or more of low power consumption mode, system safety mode, vehicle model matching mode and the like, and combinations thereof.

At 320, a timing period of the watchdog chip 110 is formed according to a 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 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 a timing period of the watchdog chip 110.

In conclusion, upon reading the present detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure can be presented by way of example only, and not limitation. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, improvements, and modifications are intended to be suggested by this application and are within the spirit and scope of the exemplary embodiments of the application.

Furthermore, certain terminology has been used in this application to describe embodiments of the application. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the application.

It should be appreciated that in the foregoing description of embodiments of the present application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of such feature. Alternatively, various features may be dispersed throughout several embodiments of the application. This is not to be taken as an admission that any of the features of the claims are essential, and it is fully possible for a person skilled in the art to extract some of them as separate embodiments when reading the present application. That is, embodiments in the present application may also be understood as an integration of multiple sub-embodiments. And each sub-embodiment described herein is equally applicable to 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 application are to be understood as being modified in certain instances by the term "about", "approximately" or "substantially". For example, "about," "approximately," or "substantially" can mean a ± 20% variation of the value it describes, unless otherwise specified. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.

Each patent, patent application, publication of a patent application, and other material, such as articles, books, descriptions, publications, documents, articles, and the like, cited herein is hereby incorporated by reference. All matters hithertofore set forth herein except as related to any prosecution history, may be inconsistent or conflicting with this document or any prosecution history which may have a limiting effect on the broadest scope of the claims. Now or later associated with this document. For example, if there is any inconsistency or conflict in the description, definition, and/or use of terms associated with any of the included materials with respect to the terms, descriptions, definitions, and/or uses associated with this document, the terms in this document are used.

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 the present application. Accordingly, the disclosed embodiments are presented by way of example only, and not limitation. Those skilled in the art can implement the invention in the present application in alternative configurations according to the embodiments in the present application. Thus, embodiments of the present application are not limited to those embodiments described with accuracy in the application.

Claims

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.