CN101749065A - Variable valve timing (VVT) adjusting method of engine and device - Google Patents
Variable valve timing (VVT) adjusting method of engine and device Download PDFInfo
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Abstract
The invention discloses a variable valve timing (VVT) adjusting method of an engine and a device, belonging to the technical field of the engine. The invention obtains the current work status of the engine by timely detecting the pressure change of an air inlet system and an air outlet system of the engine, modifies a VVT strategy according to the current work status of the engine, and updates the target value of the existing VVT strategy by taking a modified result as the target value of a new VVT strategy. The invention is mainly applied to the field of the engine, can dynamically adjust the VVT target value according the latest work status of the engine, and can better set the VVT strategy for the engine compared with the prior art that the VVT strategy only can be generated according to the preset target value, thereby changing the problems that the VVT strategy not only can not be best played but also can worsen the performance of the engine along with the aging of the engine in the prior art.
Description
Technical field
The present invention relates to technical field of engines, particularly a kind of variable valve timing (VVT) adjusting method of engine and device.
Background technique
Motor VVT (Variable Valve Timing, Variable Valve Timing) is a kind of new technology that was applied to gradually in the last few years on the car.Its principle is the runnability according to motor, in good time adjustment valve timing, control internal engine internal EGR (Exhaust Gas Recirculation, gas recirculation system) rate and raising air inlet charge, to reduce pumping loss, promote the moment of torsion and the power of motor, improve fuel economy and emission performance, idle stability and the cold starting performance of motor simultaneously.
If motor VVT technology is used to promote the performance of motor, then needs to develop different control algorithms and strategy, and in motor EMS (Engine Manager System, management system), realize.The EMS system comprises various kinds of sensors and implementation period, and ECU (Electric Control Unit, control unit).ECU collects the Operational Limits of motor according to the various kinds of sensors that is installed on the motor, comprises parameters such as rotating speed, load, water temperature, air inflow, air fuel ratio, phase place.Calculate suitable fuel injection quantity and firing angle by above-mentioned parameter, reach the purpose of management control motor.
Common VVT controlling method is the operation working condition according to motor, such as tach signal and load signal, carry out value from writing VVT desired value corresponding in the ECU form, send control command then, drive the actuator of VVT, and carry out the closed loop correction, thereby reach the VVT desired value of control motor under different operating conditionss according to the measured value of phase detector feedback.
Existing VVT control system is to determine control strategy by the method for inquiring about default table.But along with the motor growth of service time, the deterioration difference of the inlet and exhaust system of each car.And for example the pressure of air-strainer falls, the performance degradation of the obstruction of vent systems ternary catalyzing unit and this class of leaking gas, and can cause the best VVT desired value of motor also to change thereupon.And still adopting original table in the existing system, VVT not only can not get best performance like this, even can worsen engine performance.
Summary of the invention
In order to solve in the prior art motor in use for some time, because the VVT strategy that the deterioration of inlet and exhaust system causes being scheduled to no longer is applicable to the problem of motor, the embodiment of the invention has proposed a kind of engine variable-valve timing adjust system and method.Described technological scheme is as follows:
The embodiment of the invention has proposed a kind of variable valve timing (VVT) adjusting method of engine, comprising:
Obtain the air fuel ratio numerical value of motor, and according to air fuel ratio numerical value judge whether into the back pressure of air inlet, exhaust unusual; If, then read the suction pressure measured value that the gas handling system sensor records, calculate the suction pressure variance ratio of gas handling system;
Obtain the time difference of ternary catalytic device for engine front-end and back-end, calculate the exhaust pressure variance ratio of vent systems the air fuel ratio response;
Variance ratio falls according to suction pressure variance ratio and exhaust pressure, calculate the correction value of air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time, and according to the desired value of this correction value correction air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time.
Preferred as technique scheme describedly judges whether to be specially for the unusual method of the back pressure of air inlet, exhaust according to air fuel ratio numerical value:
Measurement environment pressure, and judge according to external pressure whether motor moves under altitude environment, if not, then after the engine start scheduled time, carry out air fuel ratio open loop control, and read air fuel ratio numerical value; And whether the difference of judging air fuel ratio numerical value and reference value is less than pre-set threshold value, if then judged whether other abnormal conditions, if otherwise determine that unusually whether air fuel ratio is caused unusually by air inlet and exhaust back pressure.
Preferred as technique scheme describedly read the suction pressure measured value that the gas handling system sensor records, and the method for calculating the suction pressure variance ratio of gas handling system is specially:
Relatively suction pressure measured value and default reference value calculate the difference of current suction pressure measured value and the reference value of presetting, and are calculated the suction pressure variance ratio of gas handling system by difference.
Preferred as technique scheme, described acquisition ternary catalytic device for engine front-end and back-end are to the time difference of air fuel ratio response, and the computational methods of calculating the exhaust pressure variance ratio of vent systems are specially:
According to the time difference of the measured value theoretical air-fuel ratio response that is contained in the ternary catalytic device for engine front-end and back-end, and calculate the exhaust pressure changing value of ternary catalyzing unit; And the exhaust pressure variance ratio of calculating vent systems.
Preferred as technique scheme, described according to suction pressure variance ratio and exhaust pressure variance ratio falls, calculate the correction value of air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time, and be specially according to the computational methods of the desired value of this correction value correction air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time:
Judge that described suction pressure variance ratio and exhaust pressure fall variance ratio and whether surpass predefined value, if not,, calculate intake and exhaust phrase overlap angular rate of change then according to described suction pressure variance ratio and exhaust pressure variance ratio; According to the intake and exhaust phrase overlap angular rate of change size that calculates, calculate air inlet engine variable-valve timing and and the corrected parameter of exhaust steam turbine Variable Valve Time.
Simultaneously, the embodiment of the invention has also proposed a kind of engine variable-valve timing adjusting device, comprises control unit of engine, also comprises:
The air fuel ratio testing module obtains the air fuel ratio numerical value of motor, and according to air fuel ratio numerical value judge whether into the back pressure of air inlet, exhaust unusual;
The gas handling system sensor assembly is arranged at the gas handling system of described motor, is used to survey the suction pressure measured value of described engine aspirating system;
Suction pressure variance ratio computing module is used for according to suction pressure measured value and the suction pressure variance ratio that calculates gas handling system;
The vent systems sensor assembly is used to be arranged at the ternary catalytic device for engine front-end and back-end, to survey the air fuel ratio response time difference t2 of vent systems;
Exhaust pressure variance ratio computing module is used to obtain the time difference of ternary catalytic device for engine front-end and back-end to the air fuel ratio response, calculates the exhaust pressure variance ratio of vent systems;
Adjusting module is used for according to described suction pressure variance ratio computing module and described exhaust pressure variance ratio, calculates the set out correction value of motivation Variable Valve Time of air inlet engine variable-valve timing and exhaust;
The policy store module stores engine variable-valve timing desired value, is used for upgrading according to revised air inlet engine variable-valve timing of described adjusting module and exhaust steam turbine Variable Valve Time desired value.
Preferred as technique scheme, described air fuel ratio testing module comprises:
Whether the external pressure test cell is used for according to described vent systems sensor assembly the external pressure of engine aspirating system being tested, move under altitude environment to judge transmitter; If then carry out the correction of VVT desired value according to default plateau correction factor;
The air fuel ratio reading unit is used for judging that according to described external pressure test cell the motor off-duty in altitude environment following time, then after the engine start t1 time, carries out air fuel ratio open loop control, reads air fuel ratio numerical value; And whether the difference of judging air fuel ratio numerical value and reference value is less than pre-set threshold value; If not, then send warning message;
Back pressure abnormal deciding means, the difference that is used to judge current air fuel ratio numerical value and reference value are not to be caused by other abnormal conditions during less than pre-set threshold value, judge that then unusually whether air fuel ratio is caused unusually by air inlet and exhaust back pressure.
Preferred as technique scheme, described suction pressure variance ratio computing module is arranged in the described control unit of engine, described suction pressure variance ratio computing module compares suction pressure measured value and the reference value of presetting, calculate the difference of current suction pressure measured value and default reference value, and calculate the suction pressure variance ratio of gas handling system according to difference.
Preferred as technique scheme, described exhaust pressure variance ratio computing module is arranged in the control unit of described motor, described exhaust pressure variance ratio computing module reads the time difference t2 of air fuel ratio response of the described vent systems sensor assembly of ternary catalytic device for engine front-end and back-end, calculates the difference that the exhaust pressure of ternary catalyzing unit changes; And the exhaust pressure variance ratio of calculating vent systems.
Preferred as technique scheme, described adjusting module comprises:
Judging unit judges that described suction pressure variance ratio and exhaust pressure fall variance ratio and whether surpass predefined value, if then control unit sends warning;
Intake and exhaust phrase overlap angular rate of change computing unit according to suction pressure variance ratio and exhaust pressure variance ratio, calculates intake and exhaust phrase overlap angular rate of change;
Amending unit, according to the intake and exhaust phrase overlap angular rate of change that calculates, calculate the corrected parameter of air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time, and according to corrected parameter correction air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time desired value.
The beneficial effect that the technological scheme that the embodiment of the invention provides is brought is: the method and apparatus that the embodiment of the invention proposes, can obtain the motor current working state by the pressure change rate of detection of engine gas handling system and vent systems, and the VVT strategy is revised, and upgrade the desired value of original VVT model as up-to-date VVT desired value with this according to the motor current working state.Like this, can dynamically adjust the VVT desired value according to the up-to-date working state of motor, the existing VVT that compares can only generate the VVT strategy according to preset target value, can better formulate the VVT strategy for motor, thereby the VVT strategy that causes along with engine aging in the change prior art not only can not get best performance, even can worsen the problem of engine performance.
Description of drawings
Fig. 1 is the flow chart of the variable valve timing (VVT) adjusting method of engine that provides in the embodiment of the invention 1;
Fig. 2 is the structural representation of the engine variable-valve timing adjusting device that provides in the embodiment of the invention 3;
Fig. 3 is the flow chart of a concrete example;
Fig. 4 is that best intake and exhaust phrase overlap angular rate of change (overlap) is with air inlet system and exhaust system differential back (Δ P) variance ratio schematic representation;
Fig. 5 is that exhaust VVT (Exh VVT) best target value correction factor is with exhaust back pressure variance ratio schematic representation;
Fig. 6 is that air inlet VVT (Int VVT) best target value correction factor is with gas handling system change in pressure drop rate schematic representation.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention has proposed a kind of variable valve timing (VVT) adjusting method of engine, and its flow process comprises as shown in Figure 1:
The method that the embodiment of the invention proposes, can obtain the motor current working state by the pressure change rate of detection of engine gas handling system and vent systems, and the VVT strategy is revised, and upgrade the desired value of original VVT model as up-to-date VVT desired value with this according to the motor current working state.Like this, can dynamically adjust the VVT desired value according to the up-to-date working state of motor, the existing VVT that compares can only generate the VVT strategy according to preset target value, can better formulate the VVT strategy for motor, thereby the VVT strategy that causes along with engine aging in the change prior art not only can not get best performance, even can worsen the problem of engine performance.
As the improvement of the foregoing description 1, the method for the foregoing description 1 can be specially:
Step 201, control unit of engine are by being installed in the air inlet pressure sensor measurement environment pressure on the engine aspirating system, and judge whether under altitude environment, to move according to external pressure, if then carry out the correction of VVT desired value according to default plateau correction factor, step finishes; Otherwise jump to step 202;
Step 202, after the engine start t1 time, carry out air fuel ratio open loop control, and read air fuel ratio numerical value; If the difference of air fuel ratio numerical value and reference value less than pre-set threshold value, if then enter step 203, otherwise is sent warning message, step finishes; In case this is because air fuel ratio numerical value with excessive with the difference of reference value, illustrates that important problem has appearred in motor, not to adjust the VVT strategy just can solve, therefore send warning message;
Step 203, judge that unusually whether air fuel ratio because other abnormal conditions cause (for example: oil sprayer fault, battery tension instability, throttle valve body stepper motor fault, spark coil fault, to declare cylinder incorrect), if be not then can determine that air fuel ratio is caused unusually by air inlet and exhaust back pressure unusually; The embodiment of the invention is to adopt exclusion method to determine, can also adopt additive method certainly;
Step 204, control unit check in model suction pressure P1 by engine load and tachometer 1, see Fig. 3 and table 1; Wherein the structure of table 1 is as follows, and it is the mapping table of a rotating speed, load and model suction pressure;
Table 1: rotating speed and the corresponding model suction pressure P1 of load
By the suction pressure measured value P and the suction pressure P1 that tries to achieve that tables look-up are compared, the difference DELTA P1=P-P1 of the reference value of calculating current suction pressure measured value and presetting, calculate the suction pressure variance ratio of gas handling system, suction pressure variance ratio KI=Δ P1/P by difference size delta P1;
Step 205, according to the time difference t2 of the measured value theoretical air-fuel ratio response of the lambda sensor that is contained in the ternary catalytic device for engine front-end and back-end, by response time and the change value of pressure 2 exhaust pressure changing value Δ P2 that draw ternary catalyzing unit that table look-up, further calculate the exhaust pressure variance ratio KE=Δ P2/P of vent systems;
Wherein the structure of table 2 is as follows, and it is a catalyst converter response time and change value of pressure Δ P2 relation table;
| ?t2(ms) | ??10 | ??20 | ??30 | ??40 | ??50 | ??60 |
| ?ΔP2(kPa) | ??5 | ??12 | ??22 | ??30 | ??40 | ??55 |
Table 2: catalyst converter response time and change value of pressure Δ P2 relation table
Step 206, judge that described suction pressure variance ratio and exhaust pressure fall variance ratio and whether surpass predefined value, if then control unit sends warning, step finishes; In case this is because the variance ratio of air inlet and exhaust is in a single day excessive, illustrates that then important problem has appearred in motor, not to adjust the VVT strategy just can solve, therefore send warning message;
Otherwise control unit is according to suction pressure variance ratio and exhaust pressure variance ratio, relation by suction pressure variance ratio KI and the corresponding overlap of exhaust pressure variance ratio KE, table look-up and 3 obtain air inlet phase overlapping angle changing value (Δ Ioverlap) and exhaust phase place overlapping angle changing value (Δ Eoverlap), further obtain air inlet phase overlapping angle variance ratio KI overlap, KI overlap=Δ Ioverlap/Ioverlap (wherein Ioverlap is normal air inlet phase overlapping angle); And obtain exhaust phase place overlapping angle variance ratio KE overlap, KE overlap=Δ Eoverlap/Eoverlap (wherein Eoverlap is normal exhaust phase place overlapping angle);
Wherein the structure of table 3 is as follows, and it is the mapping table of suction pressure variance ratio KI and exhaust pressure variance ratio KE and phrase overlap angle overlap;
Table 3: the VVT correction factor Koverlap of inlet and outlet pressure change rate correspondence
Step 207, according to air inlet phase overlapping angle variance ratio KI overlap and exhaust phase place overlapping angle variance ratio KE overlap, control unit is revised former air inlet VVT and exhaust VVT value, revised air inlet VVT value=air inlet phase overlapping angle variance ratio KI overlap * former VVT value, revised exhaust VVT value=exhaust phase place overlapping angle variance ratio KE overlap * former VVT value; Then with revised air inlet VVT and the storage of exhaust VVT desired value.
In the said method, provided the method for calculating the VVT corrected parameter by the suction pressure variance ratio that obtains among last two embodiments and exhaust pressure variance ratio, and with revised desired value storage, to upgrade the VVT strategy.
The embodiment of the invention has also proposed a kind of engine variable-valve timing adjusting device, comprises control unit of engine, as shown in Figure 2, also comprises:
Air fuel ratio testing module 1 reads the air fuel ratio numerical value of motor, and according to air fuel ratio numerical value judge whether into the back pressure of air inlet, exhaust unusual;
Gas handling system sensor assembly 2, the gas handling system that is arranged at described motor is to survey the suction pressure measured value of described engine aspirating system;
Suction pressure variance ratio computing module 3 compares acquisition difference DELTA P1 according to suction pressure measured value and reference value, and is calculated the suction pressure variance ratio of gas handling system by Δ P1;
Vent systems sensor assembly 4 is arranged at the ternary catalytic device for engine front-end and back-end, to survey the air fuel ratio response time difference t2 of vent systems;
Exhaust pressure variance ratio computing module 5, the time difference t2 that responds according to air fuel ratio calculates ternary catalyzing unit variation in pressure difference DELTA P2, and calculates the exhaust pressure variance ratio of vent systems according to Δ P2;
Adjusting module 6, according to described suction pressure variance ratio computing module and described exhaust pressure variance ratio, calculate intake and exhaust phrase overlap angular rate of changes (overlap), and calculate the correction value of air inlet VVT and exhaust VVT according to intake and exhaust phrase overlap angular rate of change (overlap);
The device that the embodiment of the invention proposes, can obtain the motor current working state by the pressure change rate of detection of engine gas handling system and vent systems, and the VVT strategy is revised, and upgrade the desired value of original VVT model as up-to-date VVT desired value with this according to the motor current working state.Like this, can dynamically adjust the VVT desired value according to the up-to-date working state of motor, the existing VVT that compares can only generate the VVT strategy according to preset target value, can better formulate the VVT strategy for motor, thereby the VVT strategy that causes along with engine aging in the change prior art not only can not get best performance, even can worsen the problem of engine performance.
As the improvement of the foregoing description 3, the air fuel ratio testing module in the device of the foregoing description 3, suction pressure variance ratio computing module, exhaust pressure variance ratio computing module, adjusting module can be specially respectively:
Preferably, the described air fuel ratio testing module in the foregoing description comprises:
Whether the external pressure test cell is tested the external pressure of engine aspirating system according to described vent systems sensor assembly, move under altitude environment to judge transmitter; If then carry out the correction of VVT desired value according to default plateau correction factor;
The air fuel ratio reading unit judges that when described external pressure test cell the motor off-duty in altitude environment following time, then after the engine start t1 time, carries out air fuel ratio open loop control, reads air fuel ratio numerical value; And whether the difference of judging air fuel ratio numerical value and reference value is less than pre-set threshold value; If not, then send warning message;
The back pressure abnormal deciding means, when the difference of air fuel ratio numerical value and reference value less than pre-set threshold value K, judge that then unusually whether air fuel ratio is caused unusually by air inlet and exhaust back pressure.
Be in order further to optimize the strategy of VVT like this.Because in the plateau section, the gas handling system of motor can change equally, therefore comprised plateau VVT strategy in the existing VVT strategy.Therefore the gas handling system that produces of plateau changes that engine aging no thanks to causes, not in the concern scope of the embodiment of the invention.And change for the gas handling system that non-plateau causes, need then to judge that unusually whether its air fuel ratio that causes is to be caused by other problem, if then adopt corresponding VVT strategy, unusually do not cause and have only when existing air fuel ratio, can assert that just it is caused unusually by air inlet and exhaust back pressure by existing other problem (for example: oil sprayer fault, battery tension instability, throttle valve body stepper motor fault, spark coil fault, to declare cylinder incorrect).The embodiment of the invention is to adopt exclusion method to determine, can also adopt additive method certainly.
Simultaneously, when the difference of air fuel ratio and reference value is excessive, then need to give the alarm.When the difference of air fuel ratio and reference value is in prespecified range, can revise by adjusting the VVT strategy.
Preferably, described suction pressure variance ratio computing module in the foregoing description is arranged in the described control unit of engine, described suction pressure variance ratio computing module is by tabling look-up 1, suction pressure measured value and the reference value of presetting are compared, the difference DELTA P1 of the reference value P1 that calculates current suction pressure measured value P and preset, calculate the suction pressure variance ratio of gas handling system, suction pressure variance ratio KI=Δ P1/P by difference size delta P1.Table 1 is identical with table 1 structure among above-mentioned second embodiment, no longer repeats at this.
Can directly calculate the suction pressure variance ratio by the control unit of motor like this.Can record the difference of the actual suction pressure and the standard suction pressure of motor like this, provide parameter accurately for VVT adjusts.
Preferably, described exhaust pressure variance ratio computing module in the foregoing description is arranged in the control unit of described motor, described exhaust pressure variance ratio computing module reads the time difference t2 of air fuel ratio response of described vent systems sensor assembly by response time and the change value of pressure 2 exhaust pressure changing value Δ P2 that draw ternary catalyzing unit that table look-up, and further calculates the exhaust pressure variance ratio KE=Δ P2/P of vent systems.Table 2 is identical with table 2 structure among above-mentioned second embodiment, no longer repeats at this.
Can directly calculate the exhaust pressure variance ratio by the control unit of motor like this.Can record the difference of the actual suction pressure and the standard suction pressure of motor like this, provide parameter accurately for VVT adjusts.
Preferably, the described adjusting module in the foregoing description comprises:
Judging unit judges that described suction pressure variance ratio and exhaust pressure fall variance ratio and whether surpass predefined value, if then control unit sends warning;
Intake and exhaust phrase overlap angular rate of change (overlap) computing unit, relation by suction pressure variance ratio KI and the corresponding overlap of exhaust pressure variance ratio KE, table look-up and 3 obtain air inlet phase overlapping angle changing value (Δ Ioverlap) and exhaust phase place overlapping angle changing value (Δ Eoverlap), further obtain air inlet phase overlapping angle variance ratio KI overlap, KI overlap=Δ Ioverlap/Ioverlap (wherein Ioverlap is normal air inlet phase overlapping angle); And obtain exhaust phase place overlapping angle variance ratio KE overlap, KE overlap=Δ Eoverlap/Eoverlap (wherein Eoverlap is normal exhaust phase place overlapping angle); Wherein table 3 is identical with table 3 structure among above-mentioned second embodiment, no longer repeats at this;
Amending unit, according to air inlet phase overlapping angle variance ratio KI overlap and exhaust phase place overlapping angle variance ratio KE overlap, control unit is revised former air inlet VVT and exhaust VVT value, revised air inlet VVT value=air inlet phase overlapping angle variance ratio KI overlap * former VVT value, revised exhaust VVT value=exhaust phase place overlapping angle variance ratio KE overlap * former VVT value; Then with revised air inlet VVT and the storage of exhaust VVT desired value.
In the foregoing description, provided the method for calculating the VVT corrected parameter by the suction pressure variance ratio that obtains among last two embodiments and exhaust pressure variance ratio, and with revised desired value storage, to upgrade the VVT strategy.
With a concrete example embodiment of the invention is made further explanation below:
The embodiment of the invention can be gathered a plurality of control strategies together; for example, comprising: starting control mode, idle speed control pattern, quicken control mode, the control mode that exceeds the speed limit, brake control mode, arrange warm protected mode, discharging protected mode, limping function etc.In addition, the present invention can also revise according to parameters such as temperature (oil temperature, coolant temperature, intake temperature), air fuel ratios.
As shown in Figure 5, exhaust VVT (Ext VVT) best target value correction factor is a level and smooth curve with vent systems change in pressure drop rate.As shown in Figure 6, air inlet VVT (Int VVT) best target value correction factor also should be a level and smooth curve with gas handling system change in pressure drop rate.Each point on curve all is that variance ratio Δ P1 and Δ P2 fall in the pressure according to air inlet and exhaust, the coefficient that existing VVT desired value is revised.
At first Engine ECU is by to being installed in the air inlet pressure sensor on the engine aspirating system, measure the size of external pressure, judge motor and whether under the operating mode of plateau, move,, then carry out the correction of VVT desired value under altitude environment according to the plateau correction factor if motor is to move.If motor is not to move under altitude environment, motor carries out normal operating mode.
Under normal mode, start each starting back when regular hour t1, carry out air fuel ratio open loop control, if dense partially or rare partially certain threshold values that surpasses appears in air fuel ratio, in conjunction with other unusual Rule of judgment of air fuel ratio (for example: oil sprayer fault, battery tension instability, throttle valve body stepper motor fault, spark coil fault, to declare cylinder incorrect), if other conditions all do not satisfy, can be judged as the intake and exhaust back pressure and unusual (B_VVT_P=1) occur.The embodiment of the invention is to adopt exclusion method to determine, can also adopt additive method certainly.
As shown in Figure 3, ECU, compares the desired value P1 of suction pressure measured value P and model to model suction pressure P1 by 1 the method for tabling look-up, and calculates the suction pressure measured value under specific operation and the difference DELTA P1 of peg model value, Δ P1=P-P1.
Calculate the suction pressure variance ratio of gas handling system, suction pressure variance ratio KI=Δ P1/P by difference size delta P1.
Time difference t2 according to the response of the measured value theoretical air-fuel ratio of the lambda sensor that is contained in the ternary catalytic device for engine front-end and back-end, by response time and the change value of pressure 2 exhaust pressure changing value Δ P2 that draw ternary catalyzing unit that table look-up, further calculate the exhaust pressure variance ratio KE=Δ P2/P of vent systems;
Judge that described suction pressure variance ratio and exhaust pressure fall variance ratio and whether surpass predefined value, if then control unit sends warning, step finishes; In case this is because the variance ratio of air inlet and exhaust is in a single day excessive, illustrates that then important problem has appearred in motor, not to adjust the VVT strategy just can solve, therefore send warning message;
If variance ratio is also in controlled range, then pass through the relation of the corresponding overlap of suction pressure variance ratio KI and exhaust pressure variance ratio KE, table look-up and 3 obtain air inlet phase overlapping angle changing value (Δ Ioverlap) and exhaust phase place overlapping angle changing value (Δ Eoverlap), further obtain air inlet phase overlapping angle variance ratio KI overlap, KI overlap=Δ Ioverlap/Ioverlap (wherein Ioverlap is normal air inlet phase overlapping angle); And obtain exhaust phase place overlapping angle variance ratio KE overlap, KEoverlap=Δ Eoverlap/Eoverlap (wherein Eoverlap is normal exhaust phase place overlapping angle); Wherein table 3 is identical with table 3 structure among above-mentioned second embodiment, no longer repeats at this.
According to air inlet phase overlapping angle variance ratio KI overlap and exhaust phase place overlapping angle variance ratio KE overlap, control unit is revised former air inlet VVT and exhaust VVT value, revised air inlet VVT value=air inlet phase overlapping angle variance ratio KIoverlap * former VVT value, revised exhaust VVT value=exhaust phase place overlapping angle variance ratio KE overlap * former VVT value; Then with revised air inlet VVT and the storage of exhaust VVT desired value.
All or part of content in the technological scheme that above embodiment provides can realize that its software program is stored in the storage medium that can read by software programming, storage medium for example: the hard disk in the computer, CD or floppy disk.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. variable valve timing (VVT) adjusting method of engine comprises:
Obtain the air fuel ratio numerical value of motor, and according to air fuel ratio numerical value judge whether into the back pressure of air inlet, exhaust unusual; If, then read the suction pressure measured value that the gas handling system sensor records, calculate the suction pressure variance ratio of gas handling system;
Obtain the time difference of ternary catalytic device for engine front-end and back-end, calculate the exhaust pressure variance ratio of vent systems the air fuel ratio response;
Variance ratio falls according to suction pressure variance ratio and exhaust pressure, calculate the correction value of air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time, and according to the desired value of this correction value correction air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time.
2. variable valve timing (VVT) adjusting method of engine according to claim 1 is characterized in that, describedly judges whether to be specially for the unusual method of the back pressure of air inlet, exhaust according to air fuel ratio numerical value:
Measurement environment pressure, and judge according to external pressure whether motor moves under altitude environment, if not, then after the engine start scheduled time, carry out air fuel ratio open loop control, and read air fuel ratio numerical value; And whether the difference of judging air fuel ratio numerical value and reference value is less than pre-set threshold value, if then judged whether other abnormal conditions, if otherwise determine that unusually whether air fuel ratio is caused unusually by air inlet and exhaust back pressure.
3. variable valve timing (VVT) adjusting method of engine according to claim 2 is characterized in that, describedly reads the suction pressure measured value that the gas handling system sensor records, and the method for calculating the suction pressure variance ratio of gas handling system is specially:
Relatively suction pressure measured value and default reference value calculate the difference of current suction pressure measured value and the reference value of presetting, and are calculated the suction pressure variance ratio of gas handling system by difference.
4. variable valve timing (VVT) adjusting method of engine according to claim 3, it is characterized in that, described acquisition ternary catalytic device for engine front-end and back-end are to the time difference of air fuel ratio response, and the computational methods of calculating the exhaust pressure variance ratio of vent systems are specially:
According to the time difference of the measured value theoretical air-fuel ratio response that is contained in the ternary catalytic device for engine front-end and back-end, and calculate the exhaust pressure changing value of ternary catalyzing unit; And the exhaust pressure variance ratio of calculating vent systems.
5. variable valve timing (VVT) adjusting method of engine according to claim 4, it is characterized in that, described according to suction pressure variance ratio and exhaust pressure variance ratio falls, calculate the correction value of air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time, and be specially according to the computational methods of the desired value of this correction value correction air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time:
Judge that described suction pressure variance ratio and exhaust pressure fall variance ratio and whether surpass predefined value, if not,, calculate intake and exhaust phrase overlap angular rate of change then according to described suction pressure variance ratio and exhaust pressure variance ratio; According to the intake and exhaust phrase overlap angular rate of change size that calculates, calculate air inlet engine variable-valve timing and and the corrected parameter of exhaust steam turbine Variable Valve Time.
6. an engine variable-valve timing adjusting device comprises control unit of engine, it is characterized in that, also comprises:
The air fuel ratio testing module obtains the air fuel ratio numerical value of motor, and according to air fuel ratio numerical value judge whether into the back pressure of air inlet, exhaust unusual;
The gas handling system sensor assembly is arranged at the gas handling system of described motor, is used to survey the suction pressure measured value of described engine aspirating system;
Suction pressure variance ratio computing module is used for according to suction pressure measured value and the suction pressure variance ratio that calculates gas handling system;
The vent systems sensor assembly is used to be arranged at the ternary catalytic device for engine front-end and back-end, to survey the air fuel ratio response time difference t2 of vent systems;
Exhaust pressure variance ratio computing module is used to obtain the time difference of ternary catalytic device for engine front-end and back-end to the air fuel ratio response, calculates the exhaust pressure variance ratio of vent systems;
Adjusting module is used for according to described suction pressure variance ratio computing module and described exhaust pressure variance ratio, calculates the set out correction value of motivation Variable Valve Time of air inlet engine variable-valve timing and exhaust;
The policy store module stores engine variable-valve timing desired value, is used for upgrading according to revised air inlet engine variable-valve timing of described adjusting module and exhaust steam turbine Variable Valve Time desired value.
7. engine variable-valve timing adjusting device according to claim 6 is characterized in that, described air fuel ratio testing module comprises:
Whether the external pressure test cell is used for according to described vent systems sensor assembly the external pressure of engine aspirating system being tested, move under altitude environment to judge transmitter; If then carry out the correction of VVT desired value according to default plateau correction factor;
The air fuel ratio reading unit is used for judging that according to described external pressure test cell the motor off-duty in altitude environment following time, then after the engine start t1 time, carries out air fuel ratio open loop control, reads air fuel ratio numerical value; And whether the difference of judging air fuel ratio numerical value and reference value is less than pre-set threshold value; If not, then send warning message;
Back pressure abnormal deciding means, the difference that is used to judge current air fuel ratio numerical value and reference value are not to be caused by other abnormal conditions during less than pre-set threshold value, judge that then unusually whether air fuel ratio is caused unusually by air inlet and exhaust back pressure.
8. engine variable-valve timing adjusting device according to claim 7, it is characterized in that, described suction pressure variance ratio computing module is arranged in the described control unit of engine, described suction pressure variance ratio computing module compares suction pressure measured value and the reference value of presetting, calculate the difference of current suction pressure measured value and default reference value, and calculate the suction pressure variance ratio of gas handling system according to difference.
9. engine variable-valve timing adjusting device according to claim 8, it is characterized in that, described exhaust pressure variance ratio computing module is arranged in the control unit of described motor, described exhaust pressure variance ratio computing module reads the time difference t2 of air fuel ratio response of the described vent systems sensor assembly of ternary catalytic device for engine front-end and back-end, calculates the difference that the exhaust pressure of ternary catalyzing unit changes; And the exhaust pressure variance ratio of calculating vent systems.
10. engine variable-valve timing adjusting device according to claim 9 is characterized in that, described adjusting module comprises:
Judging unit judges that described suction pressure variance ratio and exhaust pressure fall variance ratio and whether surpass predefined value, if then control unit sends warning;
Intake and exhaust phrase overlap angular rate of change computing unit according to suction pressure variance ratio and exhaust pressure variance ratio, calculates intake and exhaust phrase overlap angular rate of change;
Amending unit, according to the intake and exhaust phrase overlap angular rate of change that calculates, calculate the corrected parameter of air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time, and according to corrected parameter correction air inlet engine variable-valve timing and exhaust steam turbine Variable Valve Time desired value.
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