Control method and device for engine

A control method for an engine, which is executed by a control unit in the engine, comprising the following steps:

• determining current working status according to basic operation conditions and feature signal values of a plurality of sensors,
• generating expected target values for different targets of the engine under the current working status according to basic parameter maps,
• correcting the basic parameter maps, and controlling the different targets of the engine;
• which is characterized in that, during performing the control method for the engine, the control unit also executes the following steps:
• step S1:
• adaptively learning actual target values fed back by the different targets of the engine and performing comparison and judgment for optimization between the adaptively learned actual target values and the basic parameter maps under the same working status and the same basic operation conditions;
• wherein, if a condition is not satisfied, the basic parameter maps are kept;
• and if the condition is satisfied, dynamic parameter maps are generated, and
• step S2:
• forming combined parameter maps from the basic parameter maps and the dynamic parameter maps, and replacing the basic parameter maps with the combined parameter maps;
• wherein the dynamic parameter maps are generated according to the dynamic map generation strategy, comprising the following steps:
• a. determining a dynamic map generation region:
• the basic parameter maps of a certain control target under the same working status and the same operation conditions and the various associated feature signal values that represent the working status and the operation conditions at the moment are taken as a data node;
• the corrected basic parameter map y of this node is taken as the central value;
• and the dynamic map generation region (y−Δy, y+Δy) is generated with the difference between the expected control target value and the actual control target value as the basic reference radius;
• b. determining a dynamic map optimization region in the generation region:
• in the spatial region of the same dimension, the dynamic map generation trend is judged based on the magnitude of the changing rates of the various associated feature signal values representing this working status in this data node to determine whether the smaller region is on the (y−Δy) side or on the (y+Δy) side;
• after the determination, the median of the (y−Δy) or (y+Δy) region is taken as the new node after target approaching, which is taken as the center to determine the new approached dynamic map generation region;
• this process repeats and continuously approaches the target until the minimum region min(y−Δy, y+Δy) appears as the optimization region;
• c. generating a dynamic map:
• when the various associated feature signal values representing this working status tend to become a constant ε near zero, and the probability distribution of the associated feature signals after performing probability statistic processing is in the allowable range, the median point ym in min(y−Δy, y+Δy) is determined as the generated dynamic parameter map;
• d. determining the dynamic map:
• the above processes a-c are repeated and experiential clustering is performed;
• when the changing rates ε of the various associated feature signal values and the probability distributions of the associated feature signals are stable in an allowable changing range, this dynamic parameter map is determined and stored in a ferroelectric memory;
• at the moment, the various associated feature signal values corresponding to the determined dynamic parameter map are a set of data nodes, and the set of data nodes are working status condition signals to determine the dynamic parameter map;
• e. updating the dynamic map:
• due to the characteristic change of the engine and the usage environment change during the control process, the control targets of the generated dynamic map also change;
• during the a-d process taken on the composed data nodes, when the changing rates ε of these various associated feature signal values and the probability distributions of the associated feature signals are determined to be out of the allowable changing range, the new dynamic parameter map is regenerated, determined by experiential clustering, and then used to update the unit of the original data nodes addresses.

A control method for an engine, which is executed by a control unit in the engine, comprising the following steps:

• determining current working status according to basic operation conditions and feature signal values of a plurality of sensors,
• generating expected target values for different targets of the engine under the current working status according to basic parameter maps,
• correcting the basic parameter maps, and controlling the different targets of the engine;
• which is characterized in that, during performing the control method for the engine, the control unit also executes the following steps:
• step S1:
• adaptively learning actual target values fed back by the different targets of the engine and performing comparison and judgment for optimization between the adaptively learned actual target values and the basic parameter maps under the same working status and the same basic operation conditions;
• wherein, if a condition is not satisfied, the basic parameter maps are kept;
• and if the condition is satisfied, dynamic parameter maps are generated, and
• step S2:
• forming combined parameter maps from the basic parameter maps and the dynamic parameter maps, and replacing the basic parameter maps with the combined parameter maps;
• wherein the combined parameter maps are formed according to a dynamic map combination strategy in the step S2, comprising:
• a. comparing the basic parameter maps and the generated dynamic parameter maps under the same working status and the same operation condition or under the same working status and very close operation conditions;
• b. setting wholly or partly the dynamic parameter maps as the combined parameter maps of the engine according to the changing rates of the various associated feature signal values when the various associated feature signal values are same while the target parameters are different in the elements composing the data nodes, and shielding the corresponding basic parameter maps;
• wherein, the step of the dynamic parameter maps being wholly or partly set as the combined parameter maps of the engine according to the changing rates of the various associated feature signal values comprises:
• abandoning the dynamic parameter maps when the target is controlled by the determined dynamic parameter maps and the changing rates of the various associated feature signal values can't be stable in the allowable region, setting the basic parameter maps under the working status and the operation conditions as the combined parameter maps of the engine, and regenerating the dynamic parameter maps;
• c. calculating respectively the changing rates of the different feature signal values according to the value of the previous cycle and the value of the current cycle value when the various associated feature signal values are not all the same while the target parameters are same, comparing the changing rates to take the minimum to judge the optimization, and determining the combined parameter maps which include whole or partial dynamic parameter maps.

A control device for an engine comprising:

• a microprocessor,
• a power detecting and voltage stabilizing circuit, a communication interface CAN, LIN and external diagnosis circuit, a high-power drive circuit, a switching quantity drive circuit and a drive circuit, which are individually connected to the microprocessor;
• and,
• an input conditioning circuit, an input conditioning buffer circuit, analog signal channels and digital signal channels;
• wherein a portion of analog signals from a plurality of sensors are transported to the microprocessor via the input conditioning circuit and the analog signal channels, while the other portion of analog signals from the sensors are transported to the microprocessor via the input conditioning circuit and the digital signal channels;
• wherein digital signals from the sensors are transported to the microprocessor via the input conditioning buffer circuit and the digital signal channels;
• and
• wherein the microprocessor determines a current working status according to basic operation conditions, the analog signals and the digital signals;
• generates expected target values for different targets of the engine under the current working status according to basic parameter maps;
• and controls the different targets of the engine after the expected target values are corrected;
• which is characterized in that, the control device for the engine further comprises:
• a cerebellum model arithmetic controller CMAC which is connected to the microprocessor, and
• a ferroelectric memory which is connected to the cerebellum model arithmetic controller CMAC;
• wherein the cerebellum model arithmetic controller CMAC is used to learn adaptively actual target values fed back by different targets of the engine during performing the control method, performs comparison and judgment for optimization between the adaptively learned actual target values and the basic parameter maps, and when a condition is satisfied, generates the new dynamic parameter maps and stores into the ferroelectric memory;
• and
• wherein the microprocessor forms combined parameter maps from the basic parameter maps and the dynamic parameter maps stored in the ferroelectric memory, and replaces the basic parameter maps with the combined parameter maps.

A control method for an engine, which is executed by a control unit in the engine, comprising the following steps:

• determining current working status according to basic operation conditions and feature signal values of a plurality of sensors,
• generating expected target values for different targets of the engine under the current working status according to basic parameter maps,
• correcting the basic parameter maps, and controlling the different targets of the engine;
• which is characterized in that, during performing the control method for the engine, the control unit also executes the following steps:
• step S1:
• adaptively learning actual target values fed back by the different targets of the engine and performing comparison and judgment for optimization between the adaptively learned actual target values and the basic parameter maps under the same working status and the same basic operation conditions;
• wherein, if a condition is not satisfied, the basic parameter maps are kept;
• and if the condition is satisfied, dynamic parameter maps are generated, and
• step S2:
• forming combined parameter maps from the basic parameter maps and the dynamic parameter maps, and replacing the basic parameter maps with the combined parameter maps;
• wherein the combined parameter maps comprise combined ignition parameter maps of the engine, combined injection parameter maps of the engine, combined intake parameter maps of the engine, combined idle controlled parameter maps of the engine, combined EGR rate parameter maps, and combined ignition dwell angle parameter maps of the engine;
• wherein the combined parameter maps are formed according to a dynamic map combination strategy in the step S2, comprising:
• a. comparing the basic parameter maps and the generated dynamic parameter maps under the same working status and the same operation condition or under the same working status and very close operation conditions;
• b. setting wholly or partly the dynamic parameter maps as the combined parameter maps of the engine according to the changing rates of the various associated feature signal values when the various associated feature signal values are same while the target parameters are different in the elements composing the data nodes, and shielding the corresponding basic parameter maps;
• wherein, the step of the dynamic parameter maps being wholly or partly set as the combined parameter maps of the engine according to the changing rates of the various associated feature signal values comprises:
• abandoning the dynamic parameter maps when the target is controlled by the determined dynamic parameter maps and the changing rates of the various associated feature signal values can't be stable in the allowable region, setting the basic parameter maps under the working status and the operation conditions as the combined parameter maps of the engine, and regenerating the dynamic parameter maps;
• and
• c. calculating respectively the changing rates of the different feature signal values according to the value of the previous cycle and the value of the current cycle value when the various associated feature signal values are not all the same while the target parameters are same, comparing the changing rates to take the minimum to judge the optimization, and determining the combined parameter maps which include whole or partial dynamic parameter maps.