CN105156220A - Oxygen sensor control system and method - Google Patents
Oxygen sensor control system and method Download PDFInfo
- Publication number
- CN105156220A CN105156220A CN201510658623.2A CN201510658623A CN105156220A CN 105156220 A CN105156220 A CN 105156220A CN 201510658623 A CN201510658623 A CN 201510658623A CN 105156220 A CN105156220 A CN 105156220A
- Authority
- CN
- China
- Prior art keywords
- lambda sensor
- probe
- oxygen sensor
- signal
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention relates to an oxygen sensor control system and method. The oxygen sensor control method includes the steps that an oxygen sensor controller judges the type and the current working condition of an engine according to a rotating speed signal and an oil quantity signal, selects a Map graph prestored in the oxygen sensor controller according to the judged type of the engine and determines a heating control signal according to the judged current working condition of the engine; the oxygen sensor controller controls a heating control module to heat an oxygen sensor according to the heating control signal so that a probe of the oxygen sensor can be in the optimal working temperature interval; after the probe of the oxygen sensor is in the optimal working temperature interval, the oxygen sensor controller determines an excessive air coefficient according to the selected Map graph and an excessive air signal collected by the oxygen sensor. The influence on the oxygen sensor by temperature changes of an exhaust tube can be reduced, data collection accuracy of the oxygen sensor can be improved, and the load on a main kernel processor by sensor data is reduced.
Description
Technical field
The present invention relates to a kind of control system and method, especially a kind of lambda sensor control system and method, belong to the technical field of engine control.
Background technique
Publication number is the method for heating and controlling that the file of CN103440003A discloses a kind of lambda sensor, and it mainly realizes the computer heating control to lambda sensor.The technological means that the disclosure file adopts and the effect reached are: arrange mode of heating according to start operating performance, in conjunction with lambda sensor characteristic and demand for heat, determine that the efficiency of heating surface distributes, convert efficiency of heating surface distribution to heater switch controlled quentity controlled variable, thus realize lambda sensor and enter working state as early as possible.After entering ready working state, the computer heating control pattern of constant duty ratio is provided to maintain the working state of lambda sensor.Deficiency and the reason of technological scheme disclosed in the disclosure file are: only illustrate the lambda sensor heating means before lambda sensor enters ready working state, and in the outlet pipe installation environment of actual oxygen sensor, its ambient temperature is variable, can not ensure that the temperature of lambda sensor is in running order all the time, now adopt constant duty ratio computer heating control pattern can not identify the change of the lambda sensor working state that the change of delivery temperature environment causes.
Publication number is a kind of data acquisition and procession method that the file of CN103195594A discloses lambda sensor, and it realizes the feedback control to diesel engine EGR system based on floor data and excess air coefficient.The technological means that the disclosure file adopts and the effect reached are: diesel engine EGR control system comprises speed probe, accelerator pedal sensor, broad domain oxygen sensor, diesel engine controller, H bridge driver, direct current generator etc.System by diesel engine controller as control module; Speed probe and accelerator pedal sensor signal, as feedback parameter, input diesel engine controller, and judge the optimum excess air coefficient Map data of current working by it; Oxygen content in discarding according to broad domain oxygen sensor collection, input diesel engine controller, carry out the Map figure inquiry of actual excess air ratio, using Query Result with and the difference of optimum excess air coefficient Map data as feedback control amount, utilize PID control method to drive H bridge driver direct current generator, realize the control to EGR valve.In described open file, the deficiency of technological scheme and reason are: it relates generally to, and engine operating condition judges, the data acquisition and processing (DAP) of lambda sensor and the control of EGR valve, for the data precision of lambda sensor and the data load processing mode of response time and diesel engine controller all not mentioned.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of lambda sensor control system and method are provided, it can reduce the impact of Tail Pipe Temperature change on lambda sensor, improves the accuracy of data acquisition of lambda sensor, reduces the load that sensing data brings to main core processing device.
According to technological scheme provided by the invention, described lambda sensor control system, comprises the lambda sensor be arranged on outlet pipe, is installed on the speed probe on engine cam and is installed on the accelerator pedal sensor at gas pedal place; Described lambda sensor, accelerator pedal sensor and speed probe are all connected with oxygen sensor controller, and oxygen sensor controller is connected with the heating control module for heating lambda sensor;
Current Temperatures near the excess air signal of collection and described oxygen sensor probe transfers in oxygen sensor controller by lambda sensor, oxygen sensor controller also receives the oil mass signal of accelerator pedal sensor collection and the tach signal of speed probe collection, oxygen sensor controller judges the type of motor and the current working of described motor according to tach signal and oil mass signal, oxygen sensor controller is according to judging that the type of motor chooses the Map figure be pre-stored within oxygen sensor controller, and oxygen sensor controller is according to the current working determination thermal control signals judging motor,
Oxygen sensor controller controls heating control module and heats lambda sensor according to thermal control signals, interval to make the probe of lambda sensor can be in optimum operating temperature; After the probe of lambda sensor is in optimum operating temperature interval, oxygen sensor controller determines excess air coefficient according to the excess air signal of lambda sensor collection and the Map figure that chooses.
Described thermal control signals is pwm signal, and thermal control signals controls heating control module to the probe heating process of lambda sensor for starting heating period or work heating period;
In the startup heating period, thermal control signals heats by the probe of the regulation rate of heat addition to lambda sensor according to initial operating conditions heating control module, until the probe temperature of lambda sensor reaches assigned work temperature, described initial operating mode refers to that oxygen sensor controller gathers according to lambda sensor the initial hot spot and initial heating time that Current Temperatures, the current rotating speed of speed probe collection and the oil mass signal of accelerator pedal sensor collection near described oxygen sensor probe determine;
In the work heating period, prescribe a time limit if the Current Temperatures near oxygen sensor probe does not reach the lower of demarcation threshold value, thermal control signals adopts Bang-Bang control methods that heating control module is heated by the probe of the regulation rate of heat addition to lambda sensor, until the Current Temperatures near oxygen sensor probe is the lower limit demarcating threshold value; When Current Temperatures near oxygen sensor probe is positioned at and demarcates threshold value, thermal control signals adopts the probe of pid control law control thermal control module to lambda sensor to heat, interval to make the probe of lambda sensor be in optimum operating temperature.
Described oxygen sensor controller judges that the type of motor is petrol engine or diesel engine, when motor is petrol engine, oxygen sensor controller by excess air signal and petrol engine Map figure in lamda(0.62 ~ 1.2) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of petrol engine within the scope of nominal data; When motor is diesel engine, oxygen sensor controller by excess air signal and diesel engine Map figure in lamda(1 ~ 6) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of diesel engine within the scope of nominal data.
Described oxygen sensor controller comprises signal processing module, arithmetic analysis module, type determination module and interpolation matching module;
Oxygen sensor controller is connected with lambda sensor, accelerator pedal sensor and speed probe by signal processing module, and the tach signal that the Current Temperatures near the excess air signal of lambda sensor collection, oxygen sensor probe, accelerator pedal sensor can be gathered oil mass signal and speed probe collection by signal processing module is converted to Current Temperatures digital signal, oil mass digital signal and rotating speed digital signal near excess air digital signal, oxygen sensor probe respectively; Arithmetic analysis module receives and resolves described excess air digital signal, Current Temperatures digital signal near oxygen sensor probe, oil mass digital signal and rotating speed digital signal, type determination module judges the type of motor and the current working of motor according to excess air digital signal, oil mass digital signal and the rotating speed digital signal after parsing, and type judge module transmits thermal control signals according to the current working of motor to heating control module; According to type determination module, interpolation matching module judges that the type of motor chooses Map figure, and schemed by the Map chosen to carry out matching, to determine required excess air coefficient with excess air digital signal; The excess air coefficient determined is transferred to vehicle control system node by messaging interface by interpolation matching module.
Described oxygen sensor controller comprises main core processing device and auxiliary core processor, described main core processing device and auxiliary core processor all can read and write dynamic data shared region, main core processing device, when reading and writing dynamic data shared region, forbids the read-write operation of auxiliary core processor to dynamic data shared region; Auxiliary core processor, when reading and writing dynamic data shared region, forbids the read-write operation of main core processing device to dynamic data shared region;
Signal processing module is positioned at auxiliary core processor, and auxiliary core processor can transmit thermal control signals to heating control module; Arithmetic analysis module, type judge module and interpolation matching module are all positioned at main core processing device.
Described oxygen sensor controller can be connected with the upper-position unit for demarcating or keeping in repair, Current Temperatures near excess air coefficient, tach signal, oil mass signal and oxygen sensor probe all transfers in upper-position unit by oxygen sensor controller, with by upper-position unit display translation.
A controlling method for lambda sensor, is installed on lambda sensor on outlet pipe, to be installed on by speed probe on the camshaft of motor and accelerator pedal sensor is arranged on gas pedal place; Described lambda sensor, accelerator pedal sensor and speed probe are all connected with oxygen sensor controller, and oxygen sensor controller is connected with the heating control module for heating lambda sensor;
Current Temperatures near the excess air signal of collection and described oxygen sensor probe transfers in oxygen sensor controller by lambda sensor, and the tach signal of collection all transfers in oxygen sensor controller by accelerator pedal sensor by the oil mass signal of collection, speed probe; Oxygen sensor controller judges the type of motor and the current working of described motor according to tach signal and oil mass signal, oxygen sensor controller is according to judging that the type of motor chooses the Map figure be pre-stored within oxygen sensor controller, and oxygen sensor controller is according to the current working determination thermal control signals judging motor;
Oxygen sensor controller controls heating control module and heats lambda sensor according to thermal control signals, interval to make the probe of lambda sensor can be in optimum operating temperature; After the probe of lambda sensor is in optimum operating temperature interval, oxygen sensor controller determines excess air coefficient according to the excess air signal of lambda sensor collection and the Map figure that chooses.
Described thermal control signals is pwm signal, and thermal control signals controls heating control module to the probe heating process of lambda sensor for starting heating period or work heating period;
In the startup heating period, thermal control signals heats by the probe of the regulation rate of heat addition to lambda sensor according to initial operating conditions heating control module, until the probe temperature of lambda sensor reaches assigned work temperature, described initial operating mode refers to that oxygen sensor controller gathers according to lambda sensor the initial hot spot and initial heating time that Current Temperatures, the current rotating speed of speed probe collection and the oil mass signal of accelerator pedal sensor collection near described oxygen sensor probe determine;
In the work heating period, prescribe a time limit if the Current Temperatures near oxygen sensor probe does not reach the lower of demarcation threshold value, thermal control signals adopts Bang-Bang control methods that heating control module is heated by the probe of the regulation rate of heat addition to lambda sensor, until the Current Temperatures near oxygen sensor probe is the lower limit demarcating threshold value; When Current Temperatures near oxygen sensor probe is positioned at and demarcates threshold value, thermal control signals adopts the probe of pid control law control thermal control module to lambda sensor to heat, interval to make the probe of lambda sensor be in optimum operating temperature.
Described oxygen sensor controller judges that the type of motor is petrol engine or diesel engine, when motor is petrol engine, oxygen sensor controller by excess air signal and petrol engine Map figure in lamda(0.62 ~ 1.2) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of petrol engine within the scope of nominal data; When motor is diesel engine, oxygen sensor controller by excess air signal and diesel engine Map figure in lamda(1 ~ 6) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of diesel engine within the scope of nominal data.
Described oxygen sensor controller comprises main core processing device and auxiliary core processor, described main core processing device and auxiliary core processor all can read and write dynamic data shared region, main core processing device, when reading and writing dynamic data shared region, forbids the read-write operation of auxiliary core processor to dynamic data shared region; Auxiliary core processor, when reading and writing dynamic data shared region, forbids the read-write operation of main core processing device to dynamic data shared region.
Advantage of the present invention:
1, after lambda sensor enters ready state, oxygen sensor controller determines the heating process performed startup heating period of lambda sensor or work heating period according to the current working of motor, the impact of rapid elimination Tail Pipe Temperature change on lambda sensor state of temperature, guarantees that the probe of lambda sensor is in optimum operating temperature interval.
2, for the different excess air coefficient operating range features of diesel engine from petrol engine, oxygen sensor controller first judges the type of motor, thus choose Map figure according to corresponding type, the Map chosen is schemed carry out matching with excess air digital signal, obtain excess air coefficient, improve data precision.
3, oxygen sensor controller adopts the dual-core architecture of main core processing device and auxiliary core processor, wherein auxiliary core processor controls external sensor data, main core processing device completes external sensor data processing function, and dual microprocessors effectively can reduce the excessive data load that lambda sensor produces.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the schematic diagram that the probe of heating control module of the present invention to lambda sensor heats.
Fig. 3 is the structured flowchart of type judge module of the present invention.
Fig. 4 is the structured flowchart of oxygen sensor controller of the present invention.
Fig. 5 is the structural representation of oxygen sensor controller of the present invention.
Fig. 6 is the data processing schematic diagram of main core processing device of the present invention, auxiliary core processor.
Fig. 7 is the initialized flow chart of the present invention.
Fig. 8 is the flow chart of major cycle of the present invention.
Description of reference numerals: 1-motor, 2-lambda sensor, 3-accelerator pedal sensor, 4-speed probe, 5-oxygen sensor controller, 6-upper-position unit, 7-gas pedal, 8-camshaft, 9-signal processing module, 10-heating control module, 11-messaging interface, 12-arithmetic analysis module, 13-interpolation matching module and 14-type determination module.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1: in order to the impact of Tail Pipe Temperature change on lambda sensor 2 can be reduced, improve the accuracy of data acquisition of lambda sensor 2, the present invention includes the lambda sensor 2 be arranged on outlet pipe, be installed on the speed probe 4 on motor 1 camshaft 8 and be installed on the accelerator pedal sensor 3 at gas pedal 7 place; Described lambda sensor 2, accelerator pedal sensor 3 and speed probe 4 are all connected with oxygen sensor controller 5, and oxygen sensor controller 5 is connected with the heating control module 10 for heating lambda sensor 2;
Lambda sensor 2 neighbouring Current Temperatures of the excess air signal of collection and described lambda sensor 2 being popped one's head in transfers in oxygen sensor controller 5, oxygen sensor controller 5 also receives the oil mass signal of accelerator pedal sensor 3 collection and the tach signal of speed probe 4 collection, oxygen sensor controller 5 judges the type of motor 1 and the current working of described motor 1 according to tach signal and oil mass signal, oxygen sensor controller 5 is according to judging that the type of motor 1 chooses the Map figure be pre-stored within oxygen sensor controller 5, and oxygen sensor controller 5 is according to the current working determination thermal control signals judging motor 1,
Oxygen sensor controller 5 controls heating control module 10 and heats lambda sensor 2 according to thermal control signals, interval to make the probe of lambda sensor 2 can be in optimum operating temperature; After the probe of lambda sensor 2 is in optimum operating temperature interval, the excess air signal that oxygen sensor controller 5 gathers according to lambda sensor 2 and the Map figure chosen determine excess air coefficient.
Particularly, the corresponding mounting point of lambda sensor 2, accelerator pedal sensor 3 and speed probe 4 and effect all with position of the prior art, act on identical, oxygen sensor controller 5 is connected with lambda sensor 2, accelerator pedal sensor 3 and speed probe 4 and after obtaining excess air coefficient, can described excess air coefficient be transferred in the ECU of vehicle, heating control module 10 can heat the probe of lambda sensor 2, and probe heating process and the mode of heating of heating control module 10 pairs of lambda sensors 2 control by thermal control signals.In order to the precision of the excessive control signal that lambda sensor 2 gathers can be guaranteed, namely guarantee that oxygen sensor controller 5 obtains the precision of excess air coefficient, need to keep the probe of lambda sensor 2 to be in optimum operating temperature interval.Usually, the optimum operating temperature that lambda sensor 2 is popped one's head in is interval relevant with the type of described lambda sensor 2, needs to demarcate according to the characteristic of lambda sensor 2, is specially known by the art personnel.
In the specific implementation, the type of motor 1 is diesel engine or petrol engine, and when the type of motor 1 is different, the excess air coefficient that oxygen sensor controller 5 obtains can exist difference.The precision of excess air coefficient is obtained in order to ensure oxygen sensor controller 5, in the embodiment of the present invention, current working according to motor 1 heats lambda sensor 2, interval to guarantee that the probe of lambda sensor 2 is in optimum operating temperature, and after the probe of lambda sensor 2 is in Optimal Temperature operation interval, oxygen sensor controller 5 obtains excess air coefficient according to Map figure and excess air signal fitting, thus reduce the impact of Tail Pipe Temperature on lambda sensor 2, improve the precision of lambda sensor 2 data capture.
Further, described oxygen sensor controller 5 can be connected with the upper-position unit 6 for detecting or keeping in repair, oxygen sensor controller 5 can all transfer in upper-position unit 6 by excess air coefficient, tach signal, oil mass signal and lambda sensor 2 neighbouring Current Temperatures of popping one's head in, with by upper-position unit 6 display translation.When detecting or keep in repair, oxygen sensor controller 5 needs to be connected with upper-position unit 6, upper-position unit 6 and oxygen sensor controller 5 can carry out serial communication, upper-position unit 6 can show excess air coefficient, tach signal, oil mass signal and lambda sensor 2 and to pop one's head in neighbouring Current Temperatures, and upper-position unit 6 carries out the detection that needs or maintenance according to the data of display.In addition, upper-position unit 6 can also issue corresponding control command to oxygen sensor controller 5.
As shown in Figure 2, described thermal control signals is pwm signal, and thermal control signals controls the probe heating process of heating control module 10 pairs of lambda sensors 2 for starting heating period or work heating period;
In the startup heating period, thermal control signals heats by the probe of the regulation rate of heat addition to lambda sensor 2 according to initial operating conditions heating control module 10, until the probe temperature of lambda sensor 2 reaches assigned work temperature, described initial operating mode refers to that oxygen sensor controller 5 gathers described lambda sensor 2 according to lambda sensor 2 and pops one's head in current rotating speed that neighbouring Current Temperatures, speed probe 4 gather and the initial hot spot determined of oil mass signal that accelerator pedal sensor 3 gathers and initial heating time;
In the work heating period, if lambda sensor 2 is popped one's head in neighbouring Current Temperatures do not reach demarcate threshold value lower in limited time, thermal control signals adopts Bang-Bang control methods that heating control module 10 is heated by the probe of the regulation rate of heat addition to lambda sensor 2, until lambda sensor 2 is popped one's head in, neighbouring Current Temperatures is the lower limit demarcating threshold value; When Current Temperatures near lambda sensor 2 is popped one's head in is positioned at and demarcates threshold value, the probe that thermal control signals adopts pid control law to control thermal control module 10 pairs of lambda sensors 2 heats, interval to make the probe of lambda sensor 2 be in optimum operating temperature.
In the embodiment of the present invention, heating control module 10 implements the heating to lambda sensor 2 according to thermal control signals.Be integrated with temperature transducer in lambda sensor 2, if to the unreal applying heat of lambda sensor 2, the probe of lambda sensor 2 can cool by nature.Usually, heating control module 10 comprises power amplifier and heating plant, power amplifier is by 12V power supply pull-up, realize the power amplification to thermal control signals, the pwm signal carried out after power amplification is carried on heating plant, and heating plant realizes the heating to lambda sensor 2 according to pwm signal work.In the specific implementation, the probe heating process of heating control module 10 pairs of lambda sensors 2 is for starting heating period or work heating period, by oxygen sensor controller 5, the heating period that heating control module 10 pairs of lambda sensors 2 are popped one's head in judges that the current working of motor 1 determines.Usually, the heating that heating control module 10 pairs of lambda sensors 2 are popped one's head in is introduced into and starts the heating period, after the startup heating period completes, then enters the work heating period.
In the startup heating period, the rate of heat addition of lambda sensor 2 is the regulation rate of heat addition, and the described regulation rate of heat addition is determined by correlation technique handbook etc., is specially known by the art personnel.The probe of lambda sensor 2 reaches assigned work temperature generally in the scope of 780 DEG C ± 10 DEG C, the technological means that the process of initial hot spot (when described initial hot spot refers to that lambda sensor 2 works on power for the first time described lambda sensor 2 pop one's head in neighbouring Current Temperatures) and initial heating time can adopt the art conventional is determined according to pop one's head in neighbouring Current Temperatures, tach signal and oil mass signal of lambda sensor 2, be specially known by the art personnel, specifically repeat no more.
In the work heating period, demarcating threshold value is determine after calibration experiment according to the characteristic etc. of lambda sensor 2, and concrete span and the process of demarcating threshold value are known by the art personnel, repeat no more herein.When lambda sensor 2 pop one's head in neighbouring Current Temperatures meet enter the work heating period time, the thermal control signals that oxygen sensor controller 5 exports controls heating control module 10 and adopts Bang-Bang control methods and pid control law to heat, when adopting Bang-Bang control methods to heat, the rate of heat addition is the regulation rate of heat addition starting the heating period, when adopting pid control law to carry out heating process control, can realize steady heating process, the proportionality constant in pid control law, integral parameter and differential parameter are all determined according to calibration experiment.In the work heating period, adopt Bang-Bang control methods to combine with pid control law and carry out heating process control, can ensure that the probe of lambda sensor 2 is in optimum operating temperature interval, Bang-Bang control methods and pid control law are the conventional heating process controlling method of the art, the control procedure implementing Bang-Bang control methods and pid control law realizes by the thermal control signals being loaded into heating control module 10, be specially known by the art personnel, repeat no more herein.The concrete scope in the optimum operating temperature interval that lambda sensor 2 is popped one's head in, known by the art personnel, specifically repeats no more.
As shown in Figure 3 and Figure 4, described oxygen sensor controller 5 comprises signal processing module 9, arithmetic analysis module 12, type determination module 14 and interpolation matching module 13;
Oxygen sensor controller 5 is connected with lambda sensor 2, accelerator pedal sensor 3 and speed probe 4 by signal processing module 9, and pop one's head in neighbouring Current Temperatures, accelerator pedal sensor 3 of the excess air signal that lambda sensor 2 can gather by signal processing module 9, lambda sensor 2 gathers the Current Temperatures digital signal that tach signal is converted to excess air digital signal respectively, lambda sensor 2 is popped one's head in neighbouring, oil mass digital signal and the rotating speed digital signal that oil mass signal and speed probe 4 gather; Arithmetic analysis module 12 receives and resolves described excess air digital signal, Current Temperatures digital signal, oil mass digital signal and rotating speed digital signal that lambda sensor 2 is popped one's head in neighbouring, type determination module 14 judges the type of motor 1 and the current working of motor 1 according to excess air digital signal, oil mass digital signal and the rotating speed digital signal after parsing, and type judge module 14 transmits thermal control signals according to the current working of motor 1 to heating control module 10; According to type determination module 14, interpolation matching module 13 judges that the type of motor 1 chooses Map figure, and schemed by the Map chosen to carry out matching, to determine required excess air coefficient with excess air digital signal;
The excess air coefficient determined is transferred to vehicle control system node by messaging interface 11 by interpolation matching module 13.
In the embodiment of the present invention, the excess air signal that lambda sensor 2 gathers and described lambda sensor 2 neighbouring Current Temperatures of popping one's head in are analog amount, in addition, the oil mass signal that accelerator pedal sensor 3 gathers and the tach signal that speed probe 4 collects are analog amount, in order to oxygen sensor controller 5 carries out identifying and processing, need to carry out analog-to-digital conversion by signal processing module 9, namely by after signal processing module 9, the excess air digital signal of oxygen sensor controller 5 energy identifying processing can be obtained, the Current Temperatures digital signal that lambda sensor 2 is popped one's head in neighbouring, oil mass digital signal and rotating speed digital signal.
Current Temperatures digital signal, oil mass digital signal and rotating speed digital signal that arithmetic analysis module 12 can be popped one's head in neighbouring to excess air digital signal, lambda sensor 2 carry out the necessary process such as decode, and the signal after process enters in type judge module 14.Type judge module 14 generally comprises accumulator and Map selector, and rotating speed digital signal enters accumulator as positive variable, and oil mass digital signal enters accumulator as negative variable, and excess air digital signal also enters in accumulator.Accumulator memory contains preset value, and described preset value is obtained by rating test, and when comparative result is timing, type determination module 14 can judge that motor 1 is as diesel engine, and comparative result is for time negative, and type determination module 14 can judge that motor 1 is as petrol engine.Comparative result enters in Map selector as the output quantity of accumulator, and namely Map selector can be chosen as diesel engine or petrol engine according to comparative result.The resolving of algorithm Wiring module 12 is: first arithmetic analysis module 12 shields auxiliary core processor, then various kinds of sensors signal signal processing module 9 packing being stored in data sharing district copies, decoding, lifts a ban the reading and writing data function of auxiliary core processor subsequently.Finally oil mass digital signal, rotating speed digital signal and excess air digital signal decoding are transferred to accumulator.
Described oxygen sensor controller 5 judges that the type of motor 1 is petrol engine or diesel engine, when motor 1 is petrol engine, oxygen sensor controller 5 by excess air signal and petrol engine Map figure in lamda(0.62 ~ 1.2) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of petrol engine within the scope of nominal data; When motor 1 is diesel engine, oxygen sensor controller 5 by excess air signal and diesel engine Map figure in lamda(1 ~ 6) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of diesel engine within the scope of nominal data.In the specific implementation, Map figure chosen by the diesel engine that interpolation matching module 13 judges according to type determination module 14 or petrol engine, Map figure adopted linear multi interpolation with excess air digital signal, can obtain accurate excess air coefficient.Vehicle control system node is generally the ECU of vehicle.
As shown in Figure 5, Figure 6, described oxygen sensor controller 5 comprises main core processing device and auxiliary core processor, described main core processing device and auxiliary core processor all can read and write dynamic data shared region, main core processing device, when reading and writing dynamic data shared region, forbids the read-write operation of auxiliary core processor to dynamic data shared region; Auxiliary core processor, when reading and writing dynamic data shared region, forbids the read-write operation of main core processing device to dynamic data shared region;
Signal processing module 9 is positioned at auxiliary core processor, and auxiliary core processor can transmit thermal control signals to heating control module 10; Arithmetic analysis module 12, type judge module 14 and interpolation matching module 13 are all positioned at main core processing device.
In the specific implementation, payload processor also comprises UART module, PWM module, software interrupt module; UART module realizes exporting thermal control signals with the communication data of upper-position unit 6, PWM module, and software interrupt module is auxiliary core processor described in initialization when starting shooting; Main core processing device also comprises initialization module, major cycle module, interrupt module, timer module; Initialization module and major cycle module process institute's image data, and choose Map figure according to motor 1 type determined, and carry out data fitting and obtain excess air coefficient; Timer module provides timing beat, the packet of interrupt module process UART module.
Data Dynamic between main core processing device and auxiliary core processor stores, and has synchronous sharing functionality; Auxiliary core processor is first to peripheral sensor initializing (namely carrying out initialization to lambda sensor 2, accelerator pedal sensor 3 and speed probe 4), carry out the feature operation of peripheral module subsequently, data are encapsulated, and triggers the interrupt module of main core processing device; Auxiliary core processor dynamically shares storage space to the sensing data application gathered; Main core processing device after initialization, carries out the control of initialization strategy, perform operating mode judge, determine whether to carry out the startups heating period, start the heating period complete or do not enter startup the heating period time laggard enter major cycle.Main core processing device, when reading and writing dynamic data shared region, forbids that auxiliary core processor is to the operation sharing data in dynamic data shared region; Auxiliary core processor, when reading and writing shared data, forbids the operation of main core processing device to shared data; After shared data manipulation completes, cancellation dynamically shares storage space.The data transmitted between main core processing device, auxiliary core processor comprise excess air digital signal, lambda sensor 2 is popped one's head in neighbouring Current Temperatures digital signal, oil mass digital signal, rotating speed digital signal and thermal control signals.
As shown in Figure 7 and Figure 8, when implementing oxygen sensor control method of the present invention, first initialization is carried out to system, read lambda sensor 2 subsequently to pop one's head in neighbouring Current Temperatures, excess air signal, tach signal, oil mass signal, in order to judge the current working of motor 1, then perform as being in initial operating mode the heating process starting the heating period, otherwise directly enter major cycle.
Major cycle performs carries out training in rotation operation to work heating period, type determination module 14, arithmetic analysis module 12, interpolation matching module 13; Wherein, the execution work heating period makes the probe of lambda sensor 2 be in optimum operating temperature interval; Type determination module 14 judges the type of motor 1, juxtaposition type flag bit according to tach signal, oil mass signal, and according to type flag bit, interpolation matching module 13 selects the Map figure with type feature, and Map figure determines according to rating test; Interpolation matching module 13 is schemed according to Map, to petrol engine Map figure in lamda(0.65 ~ 1.2) adopt linear multi interpolation to carry out matching with excess air digital signal, to diesel engine Map figure in lamda(1 ~ 6 between nominal data) adopt linear multi interpolation to carry out matching with excess air digital signal between nominal data.
Oxygen sensor controller 5 of the present invention adopts the dual-core architecture of main core processing device and auxiliary core processor, main core processing device and auxiliary core processor all can read and write dynamic data shared region, thus produce excessive data load problem when effectively can solve Current Temperatures near the excess air digital signal and lambda sensor 2 that process lambda sensor 2 are popped one's head in of diesel engine controller in prior art.
Claims (10)
1. a lambda sensor control system, comprises the lambda sensor (2) be arranged on outlet pipe, is installed on the speed probe (4) on motor (1) camshaft (8) and is installed on the accelerator pedal sensor (3) at gas pedal (7) place; It is characterized in that: described lambda sensor (2), accelerator pedal sensor (3) and speed probe (4) are all connected with oxygen sensor controller (5), oxygen sensor controller (5) is connected with the heating control module (10) for heating lambda sensor (2);
Current Temperatures near the excess air signal gathered and described lambda sensor (2) probe transfers in oxygen sensor controller (5) by lambda sensor (2), oxygen sensor controller (5) also receives oil mass signal that accelerator pedal sensor (3) gathers and the tach signal that speed probe (4) gathers, oxygen sensor controller (5) judges the type of motor (1) and the current working of described motor (1) according to tach signal and oil mass signal, oxygen sensor controller (5) is according to judging that the type of motor (1) chooses the Map figure be pre-stored within oxygen sensor controller (5), and oxygen sensor controller (5) is according to the current working determination thermal control signals judging motor (1),
Oxygen sensor controller (5) controls heating control module (10) and heats lambda sensor (2) according to thermal control signals, interval to make the probe of lambda sensor (2) can be in optimum operating temperature; After the probe of lambda sensor (2) is in optimum operating temperature interval, the excess air signal that oxygen sensor controller (5) gathers according to lambda sensor (2) and the Map figure chosen determine excess air coefficient.
2. lambda sensor control system according to claim 1, it is characterized in that: described thermal control signals is pwm signal, thermal control signals controls heating control module (10) to the probe heating process of lambda sensor (2) for starting heating period or work heating period;
In the startup heating period, thermal control signals heats by the probe of the regulation rate of heat addition to lambda sensor (2) according to initial operating conditions heating control module (10), until the probe temperature of lambda sensor (2) reaches assigned work temperature, described initial operating mode refers to that oxygen sensor controller (5) gathers current rotating speed that Current Temperatures, speed probe (4) near described lambda sensor (2) probe gather and the initial hot spot that the oil mass signal that accelerator pedal sensor (3) gathers is determined and initial heating time according to lambda sensor (2);
In the work heating period, prescribe a time limit if the Current Temperatures near lambda sensor (2) probe does not reach the lower of demarcation threshold value, thermal control signals adopts Bang-Bang control methods that heating control module (10) is heated by the probe of the regulation rate of heat addition to lambda sensor (2), until the Current Temperatures near lambda sensor (2) probe is the lower limit demarcating threshold value; When Current Temperatures near lambda sensor (2) probe is positioned at and demarcates threshold value, thermal control signals adopts pid control law control thermal control module (10) probe to lambda sensor (2) to heat, interval to make the probe of lambda sensor (2) be in optimum operating temperature.
3. lambda sensor control system according to claim 1, it is characterized in that: described oxygen sensor controller (5) judges that the type of motor (1) is petrol engine or diesel engine, when motor (1) is for petrol engine, oxygen sensor controller (5) by excess air signal and petrol engine Map figure in lamda(0.62 ~ 1.2) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of petrol engine within the scope of nominal data; When motor (1) is for diesel engine, oxygen sensor controller (5) by excess air signal and diesel engine Map figure in lamda(1 ~ 6) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of diesel engine within the scope of nominal data.
4. lambda sensor control system according to claim 3, is characterized in that: described oxygen sensor controller (5) comprises signal processing module (9), arithmetic analysis module (12), type determination module (14) and interpolation matching module (13);
Oxygen sensor controller (5) is by signal processing module (9) and lambda sensor (2), accelerator pedal sensor (3) and speed probe (4) connect, the excess air signal that lambda sensor (2) can gather by signal processing module (9), Current Temperatures near lambda sensor (2) probe, the tach signal that accelerator pedal sensor (3) collection oil mass signal and speed probe (4) gather is converted to excess air digital signal respectively, Current Temperatures digital signal near lambda sensor (2) probe, oil mass digital signal and rotating speed digital signal, arithmetic analysis module (12) receives and resolves described excess air digital signal, Current Temperatures digital signal, oil mass digital signal and rotating speed digital signal near lambda sensor (2) probe, type determination module (14) judges the type of motor (1) and the current working of motor (1) according to excess air digital signal, oil mass digital signal and the rotating speed digital signal after parsing, and type judge module (14) transmits thermal control signals according to the current working of motor (1) to heating control module (10), according to type determination module (14), interpolation matching module (13) judges that the type of motor (1) chooses Map figure, and schemed by the Map chosen to carry out matching, to determine required excess air coefficient with excess air digital signal, the excess air coefficient determined is transferred to vehicle control system node by messaging interface (11) by interpolation matching module (13).
5. lambda sensor control system according to claim 4, it is characterized in that: described oxygen sensor controller (5) comprises main core processing device and auxiliary core processor, described main core processing device and auxiliary core processor all can read and write dynamic data shared region, main core processing device, when reading and writing dynamic data shared region, forbids the read-write operation of auxiliary core processor to dynamic data shared region; Auxiliary core processor, when reading and writing dynamic data shared region, forbids the read-write operation of main core processing device to dynamic data shared region;
Signal processing module (9) is positioned at auxiliary core processor, and auxiliary core processor can to heating control module (10) transmission thermal control signals; Arithmetic analysis module (12), type judge module (14) and interpolation matching module (13) are all positioned at main core processing device.
6. lambda sensor control system according to claim 1, it is characterized in that: described oxygen sensor controller (5) can be connected with the upper-position unit (6) for demarcating or keeping in repair, oxygen sensor controller (5) excess air coefficient, tach signal, oil mass signal and lambda sensor (2) are popped one's head near Current Temperatures all transfer in upper-position unit (6), with by upper-position unit (6) display translation.
7. the controlling method of a lambda sensor, it is characterized in that: be installed on outlet pipe by lambda sensor (2), the camshaft (8) be installed on by speed probe (4) in motor (1) is gone up and accelerator pedal sensor (3) is arranged on gas pedal (7) place; Described lambda sensor (2), accelerator pedal sensor (3) and speed probe (4) are all connected with oxygen sensor controller (5), and oxygen sensor controller (5) is connected with the heating control module (10) for heating lambda sensor (2);
Current Temperatures near the excess air signal gathered and described lambda sensor (2) probe transfers in oxygen sensor controller (5) by lambda sensor (2), and the tach signal of collection all transfers in oxygen sensor controller (5) by accelerator pedal sensor (3) by the oil mass signal gathered, speed probe (4); Oxygen sensor controller (5) judges the type of motor (1) and the current working of described motor (1) according to tach signal and oil mass signal, oxygen sensor controller (5) is according to judging that the type of motor (1) chooses the Map figure be pre-stored within oxygen sensor controller (5), and oxygen sensor controller (5) is according to the current working determination thermal control signals judging motor (1);
Oxygen sensor controller (5) controls heating control module (10) and heats lambda sensor (2) according to thermal control signals, interval to make the probe of lambda sensor (2) can be in optimum operating temperature; After the probe of lambda sensor (2) is in optimum operating temperature interval, the excess air signal that oxygen sensor controller (5) gathers according to lambda sensor (2) and the Map figure chosen determine excess air coefficient.
8. the controlling method of lambda sensor according to claim 7, it is characterized in that: described thermal control signals is pwm signal, thermal control signals controls heating control module (10) to the probe heating process of lambda sensor (2) for starting heating period or work heating period;
In the startup heating period, thermal control signals heats by the probe of the regulation rate of heat addition to lambda sensor (2) according to initial operating conditions heating control module (10), until the probe temperature of lambda sensor (2) reaches assigned work temperature, described initial operating mode refers to that oxygen sensor controller (5) gathers current rotating speed that Current Temperatures, speed probe (4) near described lambda sensor (2) probe gather and the initial hot spot that the oil mass signal that accelerator pedal sensor (3) gathers is determined and initial heating time according to lambda sensor (2);
In the work heating period, prescribe a time limit if the Current Temperatures near lambda sensor (2) probe does not reach the lower of demarcation threshold value, thermal control signals adopts Bang-Bang control methods that heating control module (10) is heated by the probe of the regulation rate of heat addition to lambda sensor (2), until the Current Temperatures near lambda sensor (2) probe is the lower limit demarcating threshold value; When Current Temperatures near lambda sensor (2) probe is positioned at and demarcates threshold value, thermal control signals adopts pid control law control thermal control module (10) probe to lambda sensor (2) to heat, interval to make the probe of lambda sensor (2) be in optimum operating temperature.
9. the controlling method of lambda sensor according to claim 7, it is characterized in that: described oxygen sensor controller (5) judges that the type of motor (1) is petrol engine or diesel engine, when motor (1) is for petrol engine, oxygen sensor controller (5) by excess air signal and petrol engine Map figure in lamda(0.62 ~ 1.2) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of petrol engine within the scope of nominal data; When motor (1) is for diesel engine, oxygen sensor controller (5) by excess air signal and diesel engine Map figure in lamda(1 ~ 6) adopt linear multi interpolation to carry out matching, to obtain the excess air coefficient of diesel engine within the scope of nominal data.
10. the controlling method of lambda sensor according to claim 7, it is characterized in that: described oxygen sensor controller (5) comprises main core processing device and auxiliary core processor, described main core processing device and auxiliary core processor all can read and write dynamic data shared region, main core processing device, when reading and writing dynamic data shared region, forbids the read-write operation of auxiliary core processor to dynamic data shared region; Auxiliary core processor, when reading and writing dynamic data shared region, forbids the read-write operation of main core processing device to dynamic data shared region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510658623.2A CN105156220B (en) | 2015-10-12 | 2015-10-12 | Lambda sensor control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510658623.2A CN105156220B (en) | 2015-10-12 | 2015-10-12 | Lambda sensor control system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105156220A true CN105156220A (en) | 2015-12-16 |
| CN105156220B CN105156220B (en) | 2018-03-30 |
Family
ID=54797220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510658623.2A Active CN105156220B (en) | 2015-10-12 | 2015-10-12 | Lambda sensor control system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105156220B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629720A (en) * | 2015-12-30 | 2016-06-01 | 常州联德电子有限公司 | Wide-band oxygen sensor temperature control method |
| CN106968763A (en) * | 2017-03-31 | 2017-07-21 | 凯晟动力技术（嘉兴）有限公司 | The heating power modification method and system of a kind of heater for preceding lambda sensor |
| CN108223158A (en) * | 2016-12-14 | 2018-06-29 | 现代自动车株式会社 | For controlling the device and method of lambda sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673728A (en) * | 2004-03-22 | 2005-09-28 | 日本特殊陶业株式会社 | Control apparatus for gas sensor |
| US20100114453A1 (en) * | 2008-10-30 | 2010-05-06 | Gm Global Technology Operations, Inc. | System and method for determining oxygen sensor heater resistance |
| CN201666193U (en) * | 2010-04-13 | 2010-12-08 | 上海格令汽车电子有限公司 | Wide-area oxygen sensor controller |
| CN201810406U (en) * | 2010-10-19 | 2011-04-27 | 中国汽车工程研究院股份有限公司 | Wide-domain oxygen sensor controller for realizing closed loop control in combined combustion mode |
| CN203978626U (en) * | 2014-03-08 | 2014-12-03 | 尹大湖 | Lambda sensor heat driven |
-
2015
- 2015-10-12 CN CN201510658623.2A patent/CN105156220B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673728A (en) * | 2004-03-22 | 2005-09-28 | 日本特殊陶业株式会社 | Control apparatus for gas sensor |
| US20100114453A1 (en) * | 2008-10-30 | 2010-05-06 | Gm Global Technology Operations, Inc. | System and method for determining oxygen sensor heater resistance |
| CN201666193U (en) * | 2010-04-13 | 2010-12-08 | 上海格令汽车电子有限公司 | Wide-area oxygen sensor controller |
| CN201810406U (en) * | 2010-10-19 | 2011-04-27 | 中国汽车工程研究院股份有限公司 | Wide-domain oxygen sensor controller for realizing closed loop control in combined combustion mode |
| CN203978626U (en) * | 2014-03-08 | 2014-12-03 | 尹大湖 | Lambda sensor heat driven |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629720A (en) * | 2015-12-30 | 2016-06-01 | 常州联德电子有限公司 | Wide-band oxygen sensor temperature control method |
| CN108223158A (en) * | 2016-12-14 | 2018-06-29 | 现代自动车株式会社 | For controlling the device and method of lambda sensor |
| CN108223158B (en) * | 2016-12-14 | 2021-08-06 | 现代自动车株式会社 | Apparatus and method for controlling oxygen sensor |
| CN106968763A (en) * | 2017-03-31 | 2017-07-21 | 凯晟动力技术（嘉兴）有限公司 | The heating power modification method and system of a kind of heater for preceding lambda sensor |
| CN106968763B (en) * | 2017-03-31 | 2019-07-09 | 凯晟动力技术（嘉兴）有限公司 | A kind of the heating power modification method and system of the heater for preceding lambda sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105156220B (en) | 2018-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2444638B1 (en) | Control device for vehicle | |
| US7334545B2 (en) | Method and cooling system for cooling an internal combustion engine | |
| US9115635B2 (en) | Inferred engine local temperature estimator | |
| JP5120319B2 (en) | Engine waste heat control device | |
| US20120145124A1 (en) | Engine and exhaust heating | |
| CN105156220A (en) | Oxygen sensor control system and method | |
| JP2007009878A (en) | Exhaust pipe temperature estimating device for internal combustion engine | |
| CN101094980A (en) | Internal combustion engine air volume estimation device | |
| JP4821247B2 (en) | Cooling water control device for internal combustion engine | |
| US9863393B2 (en) | Waste heat controller | |
| JP4577211B2 (en) | Method and apparatus for determining Wiebe function parameters | |
| CN103883381A (en) | Exhaust pressure estimation from wastegate motor current | |
| US20150268102A1 (en) | Apparatus for estimating temperatures of vehicle | |
| JP2001517755A (en) | Method and device for determining a temperature value in a combustion engine | |
| CN109372618A (en) | Automobile-used broad domain oxygen sensor failure monitor method | |
| CN104421021A (en) | Systems and methods for engine control based on engine oil viscosity | |
| JP2011007145A (en) | Heater controlling device for exhaust gas sensor | |
| US11092102B2 (en) | Sensor system | |
| JP4621984B2 (en) | Exhaust gas sensor heater control device | |
| JP2009257128A (en) | Control device of internal combustion engine | |
| US7243019B2 (en) | EGR fuzzy logic pintle positioning system | |
| CN118202138A (en) | Method and control unit for operating a diesel vehicle to reduce emissions, and vehicle | |
| JPH0439618B2 (en) | ||
| CN102777276A (en) | System and method for controllling fuel delivery based on output from a post-catalyst oxygen sensor during catalyst light-off | |
| JP2011127614A (en) | Cooling water control device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180816 Address after: 214063 15 Qian Rong Road, Binhu District, Wuxi, Jiangsu Co-patentee after: China FAW Group Corporation Patentee after: Wuxi Oil Pump Nozzle Institute of First Automobile Works Co-patentee after: FAW Jiefang Automotive Co., Ltd. Address before: 214063 15 Qian Rong Road, Binhu District, Wuxi, Jiangsu Co-patentee before: China FAW Group Corporation Patentee before: Wuxi Oil Pump Nozzle Institute of First Automobile Works |