JP2860561B2 - Automotive control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a control device for a motor vehicle, more specifically, a main control means and a learning control means, based on a main control parameter optimized by learning control. The present invention also relates to a control device for an automobile in which main control means performs a plurality of main controls such as knocking control and idle air-fuel ratio control.

(Prior art) In a control device of an automobile, in order to optimize a control parameter according to a driving state, an ambient environment, and the like, learning control is performed in many controls such as knocking control and idle air-fuel ratio control. Conventionally, control for learning the environment and setting control parameters to values most suitable for the operating state and the surrounding environment has been performed.

(Problems to be Solved by the Invention) However, in a conventional control device having a learning control function, learning control means is provided for each main control such as knocking control and idler air-fuel ratio control. The system is enlarged and complicated, which causes a problem that it is difficult to develop a control device that performs more various controls.

Accordingly, an object of the present invention is to provide a control device for a vehicle provided with a learning control means which does not cause the control system to be enlarged and complicated.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a main control means and a learning control means, and the main control means knocks based on a main control parameter optimized by the learning control means. In a control device for an automobile that performs a plurality of main controls such as control and idle air-fuel ratio control, the learning control unit is commonly used in a plurality of main controls, and the main control unit and the learning control unit each use an independent CPU. A dual control unit that stores, at a specific address, control information for operating the learning control CPU and main control parameters learned and controlled by the learning control CPU, and is accessible from both the main control unit and the learning control unit. It features a port ram.

(Operation) In the present invention configured as described above, the main control unit and the learning control unit are provided, and the main control unit performs the knocking control based on the main control parameters optimized by the learning control unit.
In a control device for a vehicle that performs a plurality of main controls such as an idle air-fuel ratio control, the learning control means is commonly used in the plurality of main controls, so that the control system is not enlarged and complicated. Next, the main control means and the learning control means each have an independent CPU, and further store control information for operating the learning control CPU and main control parameters learned and controlled by the learning control CPU at a specific address; A dual port ram accessible from both the main control means and the learning control means is provided, further enhancing the learning control function.On the other hand, there is no need to perform data bus timing management as in a general multi-CPU system. The control system does not become bloated or complicated.

(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.

In FIG. 1, reference numeral 1 denotes an automobile engine provided with a control device 2 according to an embodiment of the present invention, 3 denotes a spark plug of the engine 1, 4 denotes an intake passage, and 5 denotes an exhaust passage. In the intake passage 4, a fuel injector 6, a throttle valve 7, an air flow meter 8
Are arranged. Further, a throttle opening sensor 9 is provided for the throttle valve 7, a knock sensor 10 is provided for the cylinder of the engine 1, and a crank angle sensor 11 is provided near the crankshaft.
Are arranged.

An airflow signal from the airflow meter 8, a throttle opening signal from the throttle opening sensor 9, a knocking signal from the knock sensor 10, and an engine speed signal from the crank angle sensor 11 are input to the control device 2. 2 outputs an ignition signal to the ignition plug 3 and an injector signal to the fuel injector 6.

As shown in FIG. 2, the control device 2 includes a main control CPU that performs main control such as knocking control and idle air-fuel ratio control,
Learning control CPU that performs learning control and main control CPU learning control CPU
Dual port RAM accessible from any of the above, that is, RAM that can read and write data from two ports
(Hereinafter referred to as DPR), and the two CPUs and the DPR each have a control signal line through which read / write signals flow and a data bus through which control parameters for main control and control information for learning control flow. And an address bus through which an address signal indicating the address where the control parameter is stored flows. Further, although not shown in FIG. 2, the control device 2 includes an input / output interface for inputting and outputting various signals, and a memory storing a control program. The DPR stores control information for performing learning control and control parameters for main control.

The control device 2 is incorporated in the same automobile engine as in the first embodiment. The main control CPU of the control device 2 includes an air flow signal from an air flow meter 8, a throttle opening signal from a throttle opening sensor 9, A knocking signal from knock sensor 10 and an engine speed signal from crank angle sensor 11 are input, and a main control CPU of control device 2 outputs an ignition signal to spark plug 3 and an injector signal to fuel injector 6. You. Also, the main control CP
The signals from the various sensors input to U are transmitted to the learning control CPU via the main control CPU.

As shown in FIG. 3, the main control CPU writes control information for operating the learning CPU on the DPR based on the main control program, and the learning control CPU reads the control information from the DPR and executes the learning control program based on the learning control program. Learning control is performed, and the main control parameters are set to optimal values according to the driving conditions and the surrounding environment.At this time, the main control parameters that have been optimized are written to the DPR, and the main control CPU reads the main control parameters from the DPR The main control such as knocking control and idle air-fuel ratio control is performed based on the main control program.

Next, a specific example of control by the control device according to the present embodiment will be described.
A description will be given based on FIG. 4 showing a part of the flow of the main control program and FIG. 5 showing a part of the flow of the learning control program.

In the main control, the main control CPU determines whether or not the engine is in a high load state based on an engine speed signal, an air flow signal, a throttle opening signal and the like as appropriate while the vehicle is running (S51). In some cases, in order to perform knocking control, first, a knocking signal is used as a variable S for determining a running state.

As the discriminant D for the running state, a comparison formula between the average value ∫Sdt / ∫dt of the knocking signal for the predetermined engine rotation and the predetermined limit value α is used.

The ignition advance is used as a control parameter, and the parameter correction value Z by learning control is -5 °.

Address M of DPR in which initial value of control parameter is stored
It takes address 4050. (S52), and write the arguments S, D, Z, and M into the DPR (S53).

In learning control, the learning control CPU sends an argument S from DPR,
D, Z, and M are read (S61), and it is determined whether or not the argument D instructs execution of a comparison formula between the average value ∫Sdt / ∫dt of the knocking signal for the predetermined engine rotation and the predetermined limit value α. (S62), if the instructed, based on the engine speed signal and the knock signal obtains the average values S ₁ of a given n rotation of the knock control S (S63), the average values S ₁ and predetermined limit the comparator compares the value α (S64), when S ₁ is greater than the alpha is determined that there is a high possibility of occurrence of knocking DPR
, The initial value of the ignition advance stored at address 4050 is read, and the correction value Z, that is, 5 ° is subtracted from the initial value, for example, 20 °, to obtain the ignition advance, which is a knock control parameter. Optimize for the running condition and write the optimal value 15 ゜ to the DPR address M, that is, address 4050 (S65-S6
7). If S ₁ is the following α, the learning control CPU determines that the possibility is relatively low occurrence of knocking, to maintain the spark advance which is the knocking control parameter to an initial value (S64). As described above, the learning control for optimizing the knocking control parameters is completed, and the process returns to the main control. In the main control, the main control CPU reads the optimized or maintained main control parameter, that is, the ignition advance angle, from address 4050 of the DPR and executes knocking control (S54).

In the main control, the main CPU determines whether or not the engine is in an idle state based on an engine speed signal, an airflow signal, a throttle opening degree signal, and the like as appropriate while the vehicle is running (S55). In this case, in order to perform idle air-fuel ratio control, first, an engine speed signal is used as a variable S for determining a running state.

A comparison formula between the variance 状態 (S−) ² dt / ∫dt of the engine speed signal for the predetermined engine speed and the predetermined limit value β is used as the discriminant formula D for the traveling state (where the average is the engine speed signal). is there).

A fuel increase coefficient is used as a control parameter, and a parameter correction value Z by learning control is set to +0.1.

Address M of DPR in which initial value of control parameter is stored
It takes address 4060.

Then, the arguments S, D, Z, and M are written in the DPR (S57).

In learning control, the learning control CPU sends an argument S from DPR,
D, Z, and M are read (S61), and the argument D is the variance {(S−) ² dt / ∫ of the engine speed signal for the predetermined engine speed.
It is determined whether or not execution of a comparison formula between dt and a predetermined limit value β has been instructed (S68). If so, the engine speed for n predetermined rotations is determined based on the engine speed signal. obtains the variance S ₂ of the signal S (S69, S70), variance S ₂ and compares the predetermined and limits β (S71), the rotational state is unstable if S ₂ is greater than the beta It reads the initial value of the fuel increase coefficient stored at the address M of the DPR, that is, address 4060, and adds the correction value Z, that is, 0.1 to the initial value, for example, 0.1 to obtain the idle air-fuel ratio control parameter. Optimize the fuel increase coefficient for the current engine condition,
The optimum value 0.2 is written to the DPR address M, that is, address 4060 (S65 to S67). If S ₂ is less than β, the learning control CPU
Determines that the rotation state of the engine is stable, and maintains the fuel increase coefficient, which is an idle air-fuel ratio control parameter, at an initial value (S71). As described above, the learning control for optimizing the idle air-fuel ratio control parameters is completed, and the process returns to the main control. In the main control, the main control CPU reads the main control parameter optimized or maintained at the initial value, that is, the fuel increase coefficient from address 4060 of the DPR, and executes the idle air-fuel ratio control (S58).

As can be understood from the above description, in the control device according to the present embodiment, the main control and the learning control are independent of each other.
Since the CPU, that is, the main control CPU and the learning control CPU, perform the learning control function further.On the other hand, the data file is stored in the DPR, and the main control CPU and the learning control CPU use independent data buses. , Necessary data is written or read to / from the DPR, so that when one CPU writes or reads data to / from the DPR, the other CPU can write or read other data. That is, it is not necessary to perform the timing management of the data bus, that is, the timing management of the data read / write between the CPUs as in a general multi-CPU system, and it is possible to prevent the entire control system from being enlarged and complicated.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made within the scope of the invention described in the claims. .

(Effects of the Invention) As described above, according to the present invention, there is provided a control apparatus for a vehicle including a learning control unit that does not cause the control system to be enlarged and complicated.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an engine provided with an automobile control device according to an embodiment of the present invention. FIG. 2 is a diagram showing a part of a system structure of a control device for a vehicle according to another embodiment of the present invention. FIG. 3 is a diagram showing a control operation by the control device of FIG. FIG. 4 is a diagram showing a part of a flowchart of a main program in the control system of FIG. 2, and FIG. 5 is a diagram showing a part of a flowchart of a learning control program in the system of FIG. . 1 ... engine, 2 ... control device.

Claims (1)

(57) [Claims] An automobile having a main control means and a learning control means, wherein the main control means performs a plurality of main controls such as knocking control and idle air-fuel ratio control based on main control parameters optimized by the learning control means. In the control device, the learning control unit is commonly used in a plurality of main controls, and the main control unit and the learning control unit are independent CPUs.
Further, control information for operating the learning control CPU and main control parameters learned and controlled by the learning control CPU are stored at specific addresses, and are accessible from both the main control means and the learning control means. An automobile control device comprising a dual port ram.