JPS5985444A - Method for protecting learning data in engine control device - Google Patents

Abstract

PURPOSE:To prevent generation of impossible running condition, by allowing a predetermined variable range of a learning control quantity to concide with a conversion data range of an operational unit of a control circuit in a control device for giving a control output quantity with a learning control quantity and a fundamental control quantity. CONSTITUTION:MPU3 in a control circuit 2 receives data for computing a fundamental injection quantity from a rotation sensor 7 and an intake air pressure sensor 10 of sensors 1 so as to compute the fundamental injection quantity. Then, it computes a learning control quantity with data from an O2 sensor 8 and operates an injection quantity with use of both the control quantities as a parameter. When an interruption factor is generated during execution of the above main routine, MPU3 decides whether or not it is a timing for feeding a control output to a member 6 to be controlled, that is, injection valves 18-1-18-n, and if it is such a timing, MPU3 sets data corresponding to an operated injection quantity in a counter 16. After completing such an output processing, MPU returns to the main routine. Thus, in the event that learning data becomes erroneous because of electric noise, etc., there is no possibility of creation of impossible running condition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a learning data protection method in an engine control device, particularly in an electronic engine control device for automobiles, etc., in which an arithmetic unit of a control circuit incorrectly protects learning control amount (learning data) due to noise or other causes. The present invention relates to a learning data protection method that enables good engine control even when calculating the following.

In general, the engine control system for automobiles, etc., as shown in FIG. (2) A control υ11 circuit 2 that receives the detection signal from the engine sensor 1 and performs various engine controls, such as fuel injection fJJ control, ignition control, and idle speed control, and performs various calculation processes. Microphone 1) Lussa unit (MPU) 3, where the engine control program is stored in advance
(3) a memory (ROM) 4 and a random access memory (RAM>5) in which various data to be processed by the MPU 3 are temporarily read/written; The control member 6 includes a fuel injection valve, an ignition circuit, an idle speed control valve, etc.

As schematically shown in FIG. 2, a program having a main routine and an interrupt routine is stored in the ROM 4 in advance, and the MPU 3 stores the program in the ROM 4.
Various arithmetic operations are executed while sequentially reading data from the .

That is, in the main routine, the MPU 3 (1) first executes step 100 and inputs data from a sensor that outputs input data for calculating the basic control amount behind the engine sensor 1; Execute step 101 and divide basic control 1 (y) based on this input data,
3) Next, execute step 102 and input data from the sensor that outputs input data for ffl-shuning the school gate control moth among the engine sensors 1, (4) Next execute step 103, Learning control 1 based on input data
iH(x) is subtracted, (5) then step 104 is executed, and the basic control amount f(y) and the learning control 1f(
The control output amount o (f (x
i, r (y)). Then, steps 100 to 104 described above are periodically and repeatedly executed to sequentially execute processes for engine control. Furthermore, when an interrupt cause occurs while executing the above-described main routine, the MPU 3 temporarily interrupts the main routine processing and executes the interrupt routine. In this interrupt routine, (1) first execute step 200 to determine whether it is the timing to output the control output to the controlled member 6; (2) if it is determined that the timing is now, then step 201 to execute output processing. When the output processing is completed, the main routine processing that was interrupted as described above continues to be executed.

Conventionally, in this second engine control device, the learning control amount is used for the purpose of correcting the basic control amount to further improve the operating condition of the engine, and its range, that is, the variable range, is for example 0.75≦f(x)≦1.25. This variable range is stored in a 16-bit register of the RAM 5 in hexadecimal as 6000≦[(×)≦AOOO.

However, if the RAM value is inconsistent with the above, 1000 will be written in hexadecimal by mistake due to electrical noise, etc.! , : In the case of 10''ilE number, r (x ) = 0.125
Therefore, when the control output Q (f(X), f(y)) is f (x') x'r <V ), the control output becomes f(V)/8, and the vehicle running condition is extremely Taking this into consideration, a predetermined check is required when reading f (x) in order to maintain stable running.

The present invention aims to solve the above-mentioned problems, and aims to prevent the above-mentioned unstable running condition by a simple method.

Therefore, the present invention includes an engine lens 1 for detecting the operating state of the internal combustion engine, a controlled member for adjusting the operating state of the internal combustion engine, and an electronic device that receives signals from the sensor and performs output processing for the controlled member. In the engine control device, the control circuit calculates a learned control amount and a basic control amount, and calculates a control output from these, wherein the control circuit calculates a predetermined variable range of the learned control amount. It is characterized by matching the possible range of the converted data by the arithmetic unit. Refer to Figures 3 to 6 below (no) μ;
.

I will clarify.

FIG. 3 shows the data structure of the operator of the control circuit 2 for explaining learning data from a conventional learning control unit.

In Figure 3, (a) is f (x) which is 0 in decimal notation.
．． 75, (b) f(x) f(x) decimal 1&T"1.25F, (C) due to electrical noise etc.
This shows the data structure when 1000 is mistakenly entered into the li calculator in hexadecimal.

As is clear from (a), (b), and (C) in Figure 3, when 1000 is set in hexadecimal to the performance device,
This data is converted into a decimal number f (X) = 0.
125, that is, 1/8, so the control output a (
f (x), f (y)) is f 〈×)xf(y>
The control output g (f(x), f(
y)) is f(y)/8 or 4T.If the control output is, for example, the amount of fuel injection, the fuel injection is extremely small! ) 1m, making 111 cars unable to run, even temporarily.

The present invention aims to solve this problem, and FIG. 4 shows one embodiment thereof.

That is, in this embodiment, the learning control amount f(x) is 10
If a variable range of 0.75≦f(x)≦1.25 is set in advance in hexadecimal, the data structure of the arithmetic unit corresponding to the value of 0.75 will be ooo in hexadecimal as shown in (a).
o, and the data structure corresponding to the values 1 and 25 is FFFF in hexadecimal as shown in (b). Therefore, even if 1000 is mistakenly set in the arithmetic unit in hexadecimal as shown in (C) due to electrical noise or other causes, the head control 1f(x) will be expressed in decimal as f(X)= 0
．． 78125, and therefore the control output 0 (f (
x), f (y>) is f (x)xf (y), the control output is 0.78125xf (y)
Therefore, the vehicle is maintained in a fully drivable condition.

FIG. 5 shows a specific configuration of an engine control device when the present invention is applied to fuel injection control.

In FIG. 5, 1 represents an engine sensor. In the engine sensor 1, 7 is a rotation sensor;
For example, if you use a distrivicoater (a built-in rotational speed sensor that generates a rotational speed signal in synchronization with the rotation of the engine's crankshaft), the standard number of cylinders in a 4-cylinder engine or 6-cylinder engine, etc. When the cylinder blows up, 1!10
This is an A84/02 sensor that includes a cylinder discrimination sensor that detects the corresponding crank angle position, and the sensor 8: [Detects residual S concentration in the engine exhaust system. 9 is a digital sensor group other than the above-mentioned 02 sensor 8, and the digital sensor group 9 includes, for example, a starter switch that detects whether the starter is on or off, an air conditioner switch that detects whether the air conditioner is on or off There are switches, etc. 10 is an intake pressure sensor, which detects the intake pressure of the engine intake system. 11 is a series of analogs other than the intake pressure sensor 10; Sensor group 11
There is an intake air temperature sensor, etc. that detects intake air).

2 represents an electronic control circuit. In the control circuit 2, 3 is a microprocessor unit, namely M P LJ
The MPU 3 alerts the injection valve 18-1, which is a controlled member 6, based on various detection signals from the engine sensor 1 according to a program for engine injection pressure written in advance in the ROM 4. Calculate the valve opening time from 18-0 to 18-0. 4 is read-only memory or ROM
The ROM 4 stores in advance a program for the engine injection 1) J ffi control IC. Reference numeral 5 denotes a random access memory, or RAM, into which various data (including learning data) are temporarily written and read. A timer 12 generates a clock signal for starting timer interrupt processing (not shown). Reference numeral 13 denotes an interrupter capo-1 to which the rotation speed signal and cylinder discrimination signal from the rotation sensor 7 are input as interrupt signals, and the interrupt input port 13 is connected to M
Outputs an interrupt command signal to PtJ3. 14 is a digital input port into which the lean or rich signal from the O2 sensor 8 and other digital signals from the digital sensor group 9 are input; 15 is the intake pressure signal from the intake pressure sensor 10 and other digital signals from the analog sensor group 11; The analog signal is input to analog input capo-1, and the analog input capo! 15 selectively convert these analog signals into digital signals according to the channel select signal from the MPU 3 and output them. 16 is a counter, and the counter 16 receives numerical data corresponding to the opening time of the injection valve calculated by the MPU 3 to the sensor 1, and is set as described above in synchronization with the clock signal from the timer 12. 1 = numerical data. For example, it continues to output a high level signal while counting down, and when the countdown ends, it inverts and outputs a low level signal. 17 (This is a power amplification unit, and the power amplification unit 17 performs an amplification process when the output signal of the counter 16 is at a high level, and selectively applies it to the electromagnetic injection valve 181/'j Ishi 18-11. A valve opening command signal is output to. 18-1 to 18-n represent electromagnetic injection valves installed in one-to-one correspondence with, for example, 11 cylinders.

B represents a common bus for transferring data between the MPU 3 and other control circuit components 4 to 5 and 12 to 16.

MPU of the engine injection control device configured in this way
3 is Bit! according to the program shown in FIG. )
Control is performed for 1 period.

That is, MPLJ3 performs (1) in the main routine.
First, step 300 is executed, and input data for calculating the basic injection amount among the engine sensors 1, for example, data including at least a rotation speed signal from the rotation speed sensor and an intake pressure signal from the intake pressure sensor 10 is input. Data is input from the output sensor, (2) then step 301 is executed and the basic Ill! is executed based on this input data. l ray 1f(y)
(3) Next, step 302 is executed, and data is inputted from a sensor, for example, 02 sensor 8, which outputs input data for calculating the learning control amount among the engine sensors 1, and (4) Next, execute step 303, calculate the learning control I (x) by 81 based on this input data,
(5) Next, execute step 304 to obtain the basic injection amount f.
IIJtDjlfio (f (x), f
(y)), that is, calculate τ. And step 30 above
Steps 0 to 304 are periodically executed repeatedly to sequentially execute processes for engine injection control. Furthermore, when an interrupt cause occurs while executing the main routine as described above, the MPU 3 temporarily interrupts the main routine processing and executes the interrupt routine. In this interrupt routine, (1) first execute step 400 to determine whether or not it is the timing to output the control output to the controlled member 6, that is, the injection valves 18-1 to 18-n; (2) If it is determined that the timing has come, then step 401 is executed, and an output process, that is, a process of setting data corresponding to the injection amount τ calculated in the slump 304 in a counter is executed. When the output processing is completed, the main routine processing that was interrupted continues to be executed as shown in "-".

As described above, the present invention includes an engine sensor that detects the operating state of an internal combustion engine, a controlled member that adjusts the operating state of the internal combustion engine, and the sensor 1. and an electronic control circuit that performs output processing for the controlled member, and the control circuit performs learning 111 ■ Volume and rafter control 1
In the engine control device that calculates these forces λ and -II [1 output power], a predetermined variable range of the upper Rd learning control Ifa is converted to data converted by the arithmetic unit of the control circuit. matched the possible range of

Therefore, according to the present invention, it is possible to prevent the vehicle from becoming unable to run, even temporarily, if the learning data becomes incorrect due to causes such as electrical noise.

Although the explanation has been given using the case of striped engine injection control as shown in FIGS. 1 control, etc.

[Brief explanation of the drawing]

FIG. 1 shows two engine systems to which the present invention is applied. FIG. 2 is a flowchart for explaining the processing of the control circuit, especially the MPU, FIG. 3 is an example of the data configuration of a conventional arithmetic unit, and FIG. 4 is an example of an embodiment of the present invention. Data configuration example, Fig. 5 shows an example of a system when Mamimoto 1!11 is applied to enrun injection control, and Fig. 6 shows a flowchart for explaining the processing. 1... Engine sensor 2 ... Control circuit 6 ... Controlled member agent Valve 1! [! -1: Tsutomu Setachi and 1 other person

Claims (1)

[Claims] an engine sensor that detects the operating state of the internal combustion engine, a controlled member that adjusts the operating state of the internal combustion engine, and an electronic control circuit that receives signals from the sensor and performs output processing on the controlled member; and in which the control circuit calculates a learning control amount and a basic charge m+ amount and calculates a control output amount from these, wherein a predetermined variable range of the learning control amount rn is determined by an operator of the control circuit. A learning data protection method in an engine control device characterized by matching the possible range of conversion data.