CN111751111A - Engine parameter monitoring device and method and vehicle - Google Patents

Engine parameter monitoring device and method and vehicle Download PDF

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Publication number
CN111751111A
CN111751111A CN202010651766.1A CN202010651766A CN111751111A CN 111751111 A CN111751111 A CN 111751111A CN 202010651766 A CN202010651766 A CN 202010651766A CN 111751111 A CN111751111 A CN 111751111A
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China
Prior art keywords
sensor
engine parameter
parameter
engine
ecu
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CN202010651766.1A
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Chinese (zh)
Inventor
高天宇
陈昊
苗志慧
张慧峰
龙立
曾玲鑫
刘霄雨
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FAW Group Corp
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FAW Group Corp
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Priority to CN202010651766.1A priority Critical patent/CN111751111A/en
Publication of CN111751111A publication Critical patent/CN111751111A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/02—Details or accessories of testing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0421—Multiprocessor system
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/22—Pc multi processor system
    • G05B2219/2214—Multicontrollers, multimicrocomputers, multiprocessing
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25032—CAN, canbus, controller area network bus
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25033—Pc structure of the system structure, control, syncronization, data, alarm, connect I-O line to interface
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2612—Data acquisition interface
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2623—Combustion motor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2637—Vehicle, car, auto, wheelchair

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Automation & Control Theory (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses an engine parameter monitoring device and method and a vehicle. The monitoring device for the engine parameter comprises: a first ECU; a second ECU in communication connection with the first ECU; the sensor comprises at least one type of parameter sensor, a plurality of sensors and a plurality of sensors, wherein the same type of parameter sensor is used for detecting the same engine parameter; each type of parameter sensor comprises a first sub-sensor and a second sub-sensor, wherein the first sub-sensor is connected with the first ECU, and the second sub-sensor is connected with the second ECU; and the distance between the detection point of the first sub-sensor and the detection point of the second sub-sensor is smaller than a first preset value. The technical scheme provided by the embodiment of the invention can improve the accuracy and reliability of engine parameter monitoring and simplify the related calculation process in the ECU.

Description

Engine parameter monitoring device and method and vehicle
Technical Field
The embodiment of the invention relates to the field of vehicle control systems, in particular to a monitoring device and method for engine parameters and a vehicle.
Background
An Electronic Control Unit (ECU) is a Control core of an engine management system, and its basic functions are to collect sensor signals based on the engine speed and load, and to send Control commands to relevant execution units after calculation processing by a mathematical model, so as to execute a predetermined Control function.
At present, most engines generally adopt a single ECU to monitor parameters, and the specific monitoring mode comprises that the ECU acquires data of a sensor for acquiring target engine parameters and other data related to the target engine parameters, and recalculation is carried out to realize monitoring, or the ECU acquires data of the sensor for acquiring the target engine parameters and verifies the data of the sensor by estimating an empirical value through a slope and a starting time. The former monitoring mode is complex in calculation, and the latter monitoring mode adopts empirical values and estimation results for verification, so that the accuracy and the reliability are poor.
Disclosure of Invention
The embodiment of the invention provides a monitoring device and a monitoring method for engine parameters and a vehicle, which are used for improving the accuracy and the reliability of engine parameter monitoring and simplifying the related calculation process in an ECU (electronic control Unit).
In a first aspect, an embodiment of the present invention provides an engine parameter monitoring device, configured to monitor at least one engine parameter, where the engine parameter monitoring device includes:
a first ECU;
a second ECU in communication connection with the first ECU;
the sensor comprises at least one type of parameter sensor, a plurality of sensors and a plurality of sensors, wherein the same type of parameter sensor is used for detecting the same engine parameter; each type of parameter sensor comprises a first sub-sensor and a second sub-sensor, wherein the first sub-sensor is connected with the first ECU, and the second sub-sensor is connected with the second ECU; and the distance between the detection point of the first sub-sensor and the detection point of the second sub-sensor is smaller than a first preset value.
Optionally, the at least one type of parameter sensor includes a first type of parameter sensor and a second type of parameter sensor, the first type of parameter sensor detects a temperature of the engine coolant, and the second type of parameter sensor detects a number of revolutions of the engine.
Optionally, the first ECU and the second ECU are communicatively connected through a CAN bus.
In a second aspect, the embodiment of the present invention further provides a vehicle, which includes the monitoring device for the engine parameter in the first aspect.
In a third aspect, an embodiment of the present invention further provides a method for monitoring an engine parameter, where the method for monitoring an engine parameter includes:
step 1, monitoring a first engine parameter in the following mode, wherein the first engine parameter is any engine parameter to be monitored:
acquiring a first engine parameter by adopting a first sub-sensor in a first type of sensor, and acquiring a second first engine parameter by adopting a second sub-sensor in the first type of sensor; the first type of sensor is used for detecting the first engine parameter;
controlling the first ECU and the second ECU to simultaneously perform the following operations: judging whether a first type of sensor with faults exists according to the first engine parameter A and the second first engine parameter B;
when the first ECU or the second ECU determines that a first type of sensor with faults exists, the OBD or the functional safety layer reports the faults;
and 2, monitoring other engine parameters by adopting the method for monitoring the first engine parameter in the step 1.
Optionally, the determining whether there is a first type of sensor that fails according to the first engine parameter a and the second first engine parameter b includes:
judging whether the absolute value of the difference value of the first engine parameter A and the second engine parameter B is larger than or equal to a first preset value or not;
if so, judging whether the single duration of the difference value between the first engine parameter A and the second engine parameter B is greater than or equal to a first preset value or not;
if not, determining that the first type sensor with the fault does not exist.
Optionally, the determining whether the single duration of the difference between the first engine parameter a and the second engine parameter b is greater than or equal to a first preset value reaches a second preset value includes:
every time interval t is long, a built-in counter is added with 1 in an accumulated mode;
and judging whether the product of the accumulated number of the counter and t reaches a second preset value.
Optionally, after determining that the single duration of the difference between the first engine parameter a and the second engine parameter b is greater than or equal to the first preset value reaches the second preset value, the method further includes:
extracting a larger value of the first engine parameter A and the second engine parameter B;
and calculating the relevant vehicle parameters according to the larger value.
Optionally, after determining that the absolute value of the difference between the first engine parameter a and the second first engine parameter b is smaller than a first preset value, the method further includes:
calculating an average of the first engine parameter a and the second first engine parameter b;
and calculating relevant vehicle parameters according to the average value.
Optionally, the fault reported by the OBD or the functional security layer includes:
the functional safety layer monitors the OBD to carry out fault diagnosis on the first sub-sensor and the second sub-sensor in the first class of sensors and judges whether the OBD reports a diagnosis fault;
if so, the functional safety layer performs fault response monitoring, and if not, the functional safety layer reports a monitoring fault.
The monitoring device for the engine parameters provided by the embodiment of the invention comprises a first ECU, a second ECU and at least one type of parameter sensors, wherein the second ECU is in communication connection with the first ECU, the at least one type of sensor can also comprise the same type of parameter sensors for detecting the same engine parameters, each type of parameter sensor comprises a first sub-sensor and a second sub-sensor, the first sub-sensor is connected with the first ECU, the second sub-sensor is connected with the second ECU, the distance between the detection point of the first sub-sensor and the detection point of the second sub-sensor is smaller than a first preset value, the redundancy design is realized, the first ECU and the second ECU are in mutual communication to check and select the parameter sensor signals, complicated related calculation is not required to be carried out inside any ECU, the related calculation process in the ECU is further simplified, and the monitoring result is not determined by adopting empirical data and estimation data, the accuracy and the reliability of monitoring the engine parameters are improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic structural diagram of an engine parameter monitoring apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for monitoring engine parameters provided by an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for determining whether there is a failed first sensor according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating monitoring of a first engine parameter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Fig. 1 is a schematic structural diagram of a monitoring device for engine parameters according to an embodiment of the present invention. As shown in fig. 1, the monitoring device for engine parameters may specifically include a first ECU110, a second ECU120, and at least one type of parameter sensor, where the second ECU110 is in communication connection with the first ECU120, the same type of parameter sensor in the at least one type of parameter sensor is used for detecting the same engine parameter, each type of parameter sensor includes a first sub-sensor and a second sub-sensor, the first sub-sensor is connected with the first ECU110, and the second sub-sensor is connected with the second ECU 120; the distance between the detection point of the first sub-sensor and the detection point of the second sub-sensor is smaller than a first preset value.
The ECU is an electronic control unit of the automobile engine, and has the functions of operation and control, and when the engine runs, the ECU acquires engine parameter data acquired by various parameter sensors, and determines a control signal according to the engine parameter data to control the operation of relevant components in the vehicle.
Illustratively, referring to fig. 1, the at least one type of parameter sensor may include a first type of parameter sensor 130 and a second type of parameter sensor 140, the first type of parameter sensor 130 sensing a first engine parameter 150, the first engine parameter 150 being, for example, an engine coolant temperature, the second type of parameter sensor 140 sensing a second engine parameter 160, the second engine parameter 160 being, for example, an engine speed, and accordingly, the first type of parameter sensor 130 being a coolant temperature sensor and the second type of parameter sensor 140 being an engine speed sensor.
It should be further noted that, under the influence of factors such as environment, the detection points of the same type of engine parameters that are far apart have obvious differences in the corresponding engine parameters, which results in large differences in data collected by the same type of engine parameter sensors, and further, the error of mutual data verification performed by the first ECU110 and the second ECU120 is large, in order to avoid the above problems, the distance between the detection points of the same type of engine parameter sensors is set to be smaller than a first preset value, it can be understood that the first preset value can be reasonably set by a designer according to actual needs, and the smaller is generally the better.
Optionally, the first ECU110 and the second ECU120 are in communication connection through a CAN bus, so as to implement mutual verification of data of the first ECU110 and the second ECU120, reduce complexity of calculation of related data, and improve accuracy and reliability of calculation results. The CAN bus is a serial communication protocol designed by designers for developing and producing automobiles, is a safe and reliable communication connection mode, and in order to prevent the danger of the automobiles and passengers caused by data exchange errors in the service life of the automobiles, the safety system of the automobiles requires high safety of data transmission, and the CAN bus CAN meet the aim. In the present embodiment, the transmission of information in the first ECU110 and the second ECU120 is performed by a CAN controller using a CAN communication protocol, each network node of the CAN communication protocol is generally an intelligent node with a microcontroller to perform data collection and transmission, and the transmission medium may be twisted wire pair, coaxial cable, or optical fiber, for example.
It should be noted that fig. 1 only illustrates the monitoring device for engine parameters as including two types of parameter sensors, but is not limited thereto, and in other embodiments of the present embodiment, the monitoring device for engine parameters may include one type of parameter sensors, three types of parameter sensors, or more than three types of parameter sensors.
The monitoring device for engine parameters provided by the embodiment comprises a first ECU, a second ECU and at least one type of parameter sensors, wherein the second ECU is in communication connection with the first ECU, the at least one type of sensors can also comprise the same type of parameter sensors for detecting the same engine parameters, each type of parameter sensors comprise a first sub-sensor and a second sub-sensor, the first sub-sensor is connected with the first ECU, the second sub-sensor is connected with the second ECU, the distance between the detection point of the first sub-sensor and the detection point of the second sub-sensor is smaller than a first preset value, a redundancy design is realized, the first ECU and the second RCU are in mutual communication for checking and selecting the parameter sensor signals, complicated related calculation is not required to be carried out inside any ECU, further, the related calculation process in the ECU is simplified, and the monitoring result is not determined by adopting empirical data and estimated data, the accuracy and the reliability of monitoring the engine parameters are improved.
Fig. 2 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. As shown in fig. 2, the vehicle includes an engine parameter monitoring device provided in any embodiment of the present invention. Since the vehicle provided by the embodiment of the present invention includes any monitoring device for engine parameters provided by the embodiment of the present invention, the monitoring device for engine parameters includes the same or corresponding beneficial effects, and details are not repeated herein.
FIG. 3 is a flow chart of a method for monitoring engine parameters according to an embodiment of the present invention. The embodiment is applicable to monitoring engine parameters during vehicle running, and the method can be executed by the engine parameter monitoring device provided by the embodiment of the invention, and the device can be realized in the form of software and/or hardware. As shown in fig. 3, the method for monitoring the engine parameter may specifically include the following steps:
s310, monitoring a first engine parameter, wherein the first engine parameter is any engine parameter to be monitored.
Specifically, the manner of monitoring the first engine parameter may specifically include: a first engine parameter is obtained by adopting a first sub-sensor in a first type of sensor, a second engine parameter is obtained by adopting a second sub-sensor in the first type of sensor, the first type of sensor is used for detecting the first engine parameter, and a first ECU and a second ECU are controlled to simultaneously carry out the following operations: and judging whether a first type of sensor with faults exists according to the first engine parameter A and the second first engine parameter B, and reporting the faults by the OBD or the functional safety layer when the first ECU or the second ECU determines that the first type of sensor with faults exists.
It can be understood that the first type of sensor includes two sensors, the two sensors are specifically a first sub-sensor and a second sub-sensor, both the first sub-sensor and the second sub-sensor are used for acquiring a first engine parameter, the first engine parameter acquired by the first sub-sensor is an engine a parameter, and the first engine parameter acquired by the second sub-sensor is an engine b parameter.
Where the first engine parameter may be coolant temperature, engine speed, or other engine parameter that has an effect on engine torque calculations, for example, when the first engine parameter is coolant temperature, the first type of sensor may be a coolant temperature sensor for detecting coolant temperature.
Specifically, a first sub-sensor in the first type of sensor is connected with a first ECU, and the first ECU acquires first engine parameters from the first sub-sensor through a corresponding interface. The second sub-sensor is connected with the second ECU, and the second ECU acquires the second first engine parameters from the second sub-sensor through a corresponding interface.
It should be noted that the functional safety layer is used for avoiding unacceptable risks caused by system functional disorders and is mainly responsible for behaviors after a system fails, the first ECU and the second ECU communicate with each other to verify a first engine parameter a and a second engine parameter b, comparison of absolute values of differences of the two signals is performed after signal processing, a first type of sensor with a fault is determined to exist according to a comparison result, and then the functional safety layer monitors whether an OBD diagnoses the fault, monitors whether the OBD reports the corresponding fault or not under the condition that the first type of sensor fails, if so, the functional safety layer performs fault response monitoring, and if not, the functional safety layer reports the monitoring fault.
And S320, monitoring other engine parameters by adopting the method for monitoring the first engine parameter in the previous step.
The other engine parameter is an engine parameter different from the first engine parameter, and for example, when the first engine parameter is the coolant temperature, the other engine parameter may include the engine speed, for example.
When other engine parameters are obtained, the mode of monitoring the engine parameters by the first ECU and the second ECU is the same as the method of obtaining the first engine parameters by the first type of sensor, and the details are not repeated here.
Fig. 4 is a flowchart illustrating a method for determining whether there is a first type of sensor that fails according to an embodiment of the present invention. As shown in fig. 4, the first sensor for determining whether there is a fault according to the first engine parameter a and the second engine parameter b may specifically include the following:
s410, judging whether the absolute value of the difference value of the first engine parameter A and the first engine parameter B is larger than or equal to a first preset value.
The first preset value is a parameter threshold value when the first type of sensor is monitored to be in a fault state, for example, when the first engine parameter is the temperature of the cooling liquid, the first preset value may be set to be 10 ℃, and when the first engine parameter is the engine speed, the first preset value may be 500 r/min.
And S420, if so, judging whether the single duration of the difference value between the first engine parameter A and the first engine parameter B is greater than or equal to a first preset value or not reaches a second preset value.
The second preset value is a fault-tolerant time to avoid the erroneous determination in step S410, and may be set to 500ms, for example.
And S430, if not, determining that the first type of sensor with the fault does not exist.
The parameter monitoring process is specifically described below by taking the monitoring process of the first engine parameter as an example. Fig. 5 is a flowchart illustrating monitoring of a first engine parameter according to an embodiment of the present invention. Fig. 5 illustrates a monitoring process in either ECU, and a monitoring process in the other ECU is the same. As shown in fig. 5, the ECU collects a first engine parameter a and a first engine parameter b and then performs signal processing, that is, calculates an absolute value of a difference between the first engine parameter a and the first engine parameter b, determines whether the absolute value of the difference between the first engine parameter a and the first engine parameter b is greater than or equal to a first preset value, if so, the counter starts timing, determines whether a single duration of the first engine parameter a and the first engine parameter b is greater than or equal to the first preset value exceeds a second preset value according to an accumulated value of the counter, and if not, the system performs zero clearing processing on the counter and reenters a monitoring state of the difference between the first engine parameter a and the first engine parameter b.
Optionally, as shown in fig. 5, after determining that the absolute value of the difference between the first engine parameter a and the second engine parameter b is smaller than the first preset value, the method further includes: and calculating the average value of the first engine parameter A and the second engine parameter B, and calculating the related vehicle parameters according to the average value. Such an arrangement can reduce the calculation error of the relevant vehicle parameter.
On the other hand, referring to fig. 5, if the absolute value of the difference between the first engine parameter a and the second engine parameter b is greater than or equal to the first preset value, the single duration exceeds the second preset value, the OBD or the functional safety layer reports a fault. Exemplary, the OBD or functional security layer reporting a fault includes: and the functional safety layer monitors the OBD to perform fault diagnosis on the first sub-sensor and the second sub-sensor in the first type of sensor and judges whether the OBD reports a diagnosis fault, if so, the functional safety layer performs fault response monitoring, and if not, the functional safety layer reports a monitoring fault.
With continued reference to fig. 5, after determining that the single duration of the difference between the first engine parameter a and the second engine parameter b is greater than or equal to the first preset value reaches the second preset value, the method further includes: and extracting a larger value of the first engine parameter A and the second engine parameter B, and calculating the related vehicle parameter according to the larger value.
It should be noted that, when the absolute value of the difference between the first engine parameter a and the second engine parameter b is greater than or equal to the first preset value and the single duration exceeds the second preset value, in order to avoid the occurrence of the malfunction and engine overheating problem caused by underestimation of the first engine parameter a or the second engine parameter b and overestimation of another signal, for example, the engine is suddenly accelerated due to increase of torque loss to cause the malfunction, when the duration determined in the counting stage exceeds the second preset value, the larger one of the first engine parameter a and the second engine parameter b is selected for relevant calculation, so as to avoid injury to people and vehicles.
For example, the specific way of recording the single duration of the difference between the first engine parameter a and the second engine parameter b by using the counter to determine whether the duration is greater than the second preset value may be: and accumulating and adding 1 by the built-in counter every time t is long, and judging whether the product of the accumulated number of the counter and t reaches a second preset value.
It should be noted that the product of the accumulated number and t is the total time period from the beginning to the end of counting, that is, the absolute value of the difference between the first engine parameter a and the first engine parameter b is greater than or equal to the first preset value single duration.
The counter can be used for the counter in the inherent configuration of the ECU, other timing parts are not needed, and the ECU structure is simplified.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. An engine parameter monitoring device for monitoring at least one engine parameter, comprising:
a first ECU;
a second ECU in communication connection with the first ECU;
the sensor comprises at least one type of parameter sensor, a plurality of sensors and a plurality of sensors, wherein the same type of parameter sensor is used for detecting the same engine parameter; each type of parameter sensor comprises a first sub-sensor and a second sub-sensor, wherein the first sub-sensor is connected with the first ECU, and the second sub-sensor is connected with the second ECU; and the distance between the detection point of the first sub-sensor and the detection point of the second sub-sensor is smaller than a first preset value.
2. The monitoring device according to claim 1, wherein the at least one type of parameter sensor includes a first type of parameter sensor that detects an engine coolant temperature and a second type of parameter sensor that detects a rotational speed of the engine.
3. The monitoring device of claim 1, wherein the first ECU and the second ECU are communicatively connected via a CAN bus.
4. A vehicle comprising an engine parameter monitoring device as claimed in any one of claims 1 to 3.
5. A method of monitoring engine parameters, comprising:
step 1, monitoring a first engine parameter in the following mode, wherein the first engine parameter is any engine parameter to be monitored:
acquiring a first engine parameter by adopting a first sub-sensor in a first type of sensor, and acquiring a second first engine parameter by adopting a second sub-sensor in the first type of sensor; the first type of sensor is used for detecting the first engine parameter;
controlling the first ECU and the second ECU to simultaneously perform the following operations: judging whether a first type of sensor with faults exists according to the first engine parameter A and the second first engine parameter B;
when the first ECU or the second ECU determines that a first type of sensor with faults exists, the OBD or the functional safety layer reports the faults;
and 2, monitoring other engine parameters by adopting the method for monitoring the first engine parameter in the step 1.
6. The monitoring method of claim 5, wherein determining whether there is a first type of sensor that is malfunctioning based on the first engine parameter and the second first engine parameter comprises:
judging whether the absolute value of the difference value of the first engine parameter A and the second engine parameter B is larger than or equal to a first preset value or not;
if so, judging whether the single duration of the difference value between the first engine parameter A and the second engine parameter B is greater than or equal to a first preset value or not;
if not, determining that the first type sensor with the fault does not exist.
7. The monitoring method of claim 6, wherein determining whether a single duration of time for which an absolute value of a difference between the first engine parameter A and the second first engine parameter B is greater than or equal to a first preset value reaches a second preset value comprises:
every time interval t is long, a built-in counter is added with 1 in an accumulated mode;
and judging whether the product of the accumulated number of the counter and t reaches a second preset value.
8. The monitoring method according to claim 6, after determining that the single duration in which the absolute value of the difference between the first engine parameter A and the second first engine parameter B is greater than or equal to a first preset value reaches a second preset value, further comprising:
extracting a larger value of the first engine parameter A and the second engine parameter B;
and calculating the relevant vehicle parameters according to the larger value.
9. The monitoring method of claim 6, after determining that the absolute value of the difference between the first engine parameter A and the second first engine parameter B is less than a first predetermined value, further comprising:
calculating an average of the first engine parameter a and the second first engine parameter b;
and calculating relevant vehicle parameters according to the average value.
10. The monitoring method of claim 5, wherein the fault reported by the OBD or functional Security layer comprises:
the functional safety layer monitors the OBD to carry out fault diagnosis on the first sub-sensor and the second sub-sensor in the first class of sensors and judges whether the OBD reports a diagnosis fault;
if so, the functional safety layer performs fault response monitoring, and if not, the functional safety layer reports a monitoring fault.
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