JPS5974337A - Fuel injector - Google Patents

Abstract

PURPOSE:To perform the optimal control of an engine at its acceleration, by altering the compensated quantity of injected fuel depending on four levels of acceleration, in an automobile fuel injector employing a microcomputer. CONSTITUTION:The degree of opening of a throttle valve is sampled for every prescribed time to detect the acceleration of an engine from the sampled values. A compensated quantity of fuel is additionally injected depending on each of four levels of the acceleration. The difference DELTATH between the preceding and succeeding degrees of opening of the throttle valve is determined for classification to the four levels. For instance, the level ''1'' corresponds to the opening degree of 1-2.5, the level ''2'' the opening degree of 2.5-5, the level ''3'' the opening degree of 5-7, and the level ''4'' the opening degree of 7 or more. As a result, the engine is controlled in an optimal manner at its acceleration.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an engine control device, and more specifically to an automobile engine control device using a microcomputer. The present invention relates to a fuel injection device that corrects and injects the amount of fuel according to an acceleration state.

[Prior art]

Recently, comprehensive control of engines using microcomputers has been implemented in order to improve engine control functions.

On the other hand, the control functions required for the engine vary depending on the vehicle type and purpose, and therefore, in an engine control system using a microcomputer, the software that operates the engine control device is versatile depending on the vehicle type and purpose. In other words, a device that allows various control functions to be modified, changed, and added is required from the viewpoint of cost or improved controllability.

Conventionally, the amount of air taken into the internal combustion engine has been determined by indirectly detecting the air flow rate from the intake manifold pressure or by directly detecting the air flow rate to determine the total amount of air in the intake stroke ρ. The former method has poor accuracy because it is an indirect method, and has the disadvantage of being affected by machine differences and deterioration of the engine, resulting in extremely poor response, whereas the latter method is highly accurate (reading value ±1%). ,
This method requires a flow sensor with a wide dynamic range (1:50) and has the drawback of high cost. If a so-called hot-wire flow sensor is used as the flow sensor, it is possible to reduce the cost, and it is desirable that the non-linearity of the output characteristic equalizes relative errors and allows a wide dynamic range.

However, the engine intake air flow rate is not constant but pulsates, and the output signal from the flow sensor has a nonlinear relationship with the intake air flow, and the air flow rate during the intake stroke can be determined from the responsive output signal. It is necessary to calculate the instantaneous air flow rate in the form of integration, and this integration requires complex arithmetic processing. That is, the hot wire output voltage V shown in FIG.
Letting the mass flow rate be q, then equation (1) becomes v2 = C, + C2 ball amount''-(2).Now, the engine rotation speed N-0 and the mass flow rate q^2 If the hot wire output 'acid pressure V at the time of 〇 is V-vo, the equation (2) becomes v, F=C8... (3). Therefore, the equation (2) , From equation (3), v2=vl+C1housel... Song (4) QA= (v2-v
7) 2--...Track (5)i and the instantaneous mass flow rate qA are determined by equation (5). Therefore, the average air flow rate Q during one intake stroke is as follows.

Furthermore, the amount of solvent injection per intake stroke Q is determined by the engine speed, where N is the engine rotational speed and K is a constant. Therefore, by finding QA, the fuel injection amount Q per rotation is determined by the rotational speed. This is the translation.

In this way, the basic fuel injection amount Q is determined, but when accelerating the engine, if you try to accelerate with only the basic fuel injection amount Q, the acceleration will not be smooth due to the QA calculation delay etc. . Therefore, the basic fuel injection amount is corrected by detecting the acceleration state based on the amount of change in QA intake. However, as described above, this intake air flow rate QA has pulsations, so the detection of the low speed state may be erroneously detected. Therefore, the acceleration state is detected by detecting the opening degree of the throttle valve. In other words, the throttle opening is sampled every 10m5I3C and 10
The difference between the current value and the captured value 39m5f30 ago is detected every m5ec, and whether or not there is an acceleration state is detected.

The fuel is corrected according to this acceleration state, but conventionally, since the fuel is corrected by a fixed amount during acceleration, it has the disadvantage that the fuel becomes dull due to the fuel delay and becomes rich in the latter half of acceleration.

In addition, during conventional acceleration, especially during deceleration or acceleration from idling, the intake manifold is dry during deceleration or idling, and even if there is a correction increase for acceleration, the intake manifold will only get wet. However, it has the disadvantage that the correction effect is not sufficiently improved.

[Purpose of the invention]

An object of the present invention is to provide a fuel injection device that can perform optimal engine control during acceleration.

[Summary of the invention]

The present invention samples the opening degree of the throttle valve at regular intervals, detects the throttle speed state from the sampled value, and additionally injects correction amounts according to four levels, thereby optimizing the engine during acceleration. The idea is to exercise control.

[Embodiments of the invention]

Examples of the present invention will be described below.

FIG. 2 shows a control device for the entire engine system.

In the figure, intake air passes through an air cleaner 2, a throttle chamber 4, and an intake pipe 6, and is supplied to a cylinder 8.

The gas burned in the cylinder 8 is transferred from the cylinder 8 to the exhaust pipe 1.
0 and is emitted into the atmosphere.

The throttle chamber 4 is provided with an injector 12 for injecting fuel.
The fuel ejected from the throttle chamber 4 is atomized in the air passage of the throttle chamber 4 and mixed with the intake air to form a mixture, and this mixture passes through the intake pipe 6 and when the intake valve 20 is opened.
It is supplied to the combustion chamber of cylinder 8.

Throttle valves 14 and 16 are provided near the outlet of the injector 12. The throttle valve 14 is configured to be in mechanical communication with the accelerator pedal and is actuated by the driver.

On the other hand, the throttle valve 16 is arranged to be driven by the diaphragm 18, and is fully closed when the air flow rate is small, and as the air flow rate increases, the negative pressure on the diaphragm 18 increases. The throttle valve 16 begins to open, suppressing an increase in suction resistance.

An air passage 22 is provided upstream of the throttle valve 14.1617) of the throttle chamber 4, and an electric heating element 24 constituting a thermal air flowmeter is disposed in this air passage 22, and the air flow rate and the heating element are adjusted. An electrical signal is extracted that changes depending on the air flow velocity, which is determined from the relationship with the amount of heat transfer. Since the heating element 24 is provided within the air passage 22, it is protected from high-temperature gas generated when the cylinder 8 backfires, and is also protected from being contaminated by dust in the intake air. The outlet of this air passage 22 is opened near the narrowest part of the venturi, and the inlet thereof is opened on the upstream side of the venturi.

Although not shown in FIG. 2, this throttle valve 14.16 is provided with a throttle angle sensor that detects the opening degree of the throttle valve 14.16, and a detection signal from this throttle angle sensor is provided. is taken from a throttle angle sensor 116 shown in FIG.

The fuel supplied to the injector 12 is supplied to the fuel tank 30
From, Fuel Bon 7'32, Tsuyuendampa 34
and is supplied to the fuel pressure regulator 38 via the filter 36. On the other hand, pressurized fuel is supplied from the fuel pressure regulator 38 to the injector 12 via a pipe 40, and the difference between the pressure in the intake pipe 6 through which fuel is injected from the injector 12 and the fuel amount pressure to the injector 12 is always constant. As such, fuel is returned from the fuel pressure regulator 38 to the fuel tank 30 via the return pipe 42.

The air-fuel mixture taken in from the intake valve 20 is compressed by the piston 50 and combusted by a spark from the ignition plug 52, and this combustion is converted into kinetic energy. The cylinder 8 is cooled by cooling water 54, and the temperature of this cooling water is measured by a water temperature sensor 56, and this measured value is used as the engine temperature. A high voltage is supplied to the ignition plug 52 in accordance with the ignition timing of the ignition coil 58.

In addition, a crank angle sensor (not shown) is provided on the crankshaft, which outputs a reference angle signal and a position signal for each reference crank color and at every fixed angle (for example, 0.5 degrees) according to the revolution (9) of the engine. There is.

Output of this crank angle sensor, output 5 of water temperature sensor 56
6A and the electric signals from the heating element 24 are input to a control circuit 64 consisting of a microcomputer, etc.
4, and the injector 12 and ignition coil 58 are driven by the output of the control circuit 64.

In the engine system controlled based on the above configuration,
The throttle chamber 4 is provided with a bypass 26 that communicates with the intake pipe 6 across the throttle valve 16, and this bypass 26 is provided with a bypass valve 62 that is controlled to open and close. A control input from the control circuit 64 is supplied to the driving section of the bypass valve 62, so that opening and closing of the bypass valve 62 is controlled.

This bypass valve 62 faces the bypass 26 provided by bypassing the throttle valve 16, and is controlled to open and close by pulse current. This bypass (10) valve 62 changes the cross-sectional area of the bypass (10) according to the lift amount of the valve, and this lift amount is controlled by driving the drive system by the output of the control circuit 64. That is, the control circuit 64 generates an opening/closing cycle signal to control the drive system, and the drive system applies a control signal to the drive section of the bypass pulp 62 to adjust the lift amount of the bypass pulp 62 based on the opening/closing cycle signal. It is something to do.

FIG. 3 is an explanatory diagram of the ignition device of FIG. 2, and the amplifier 68
A pulse current is supplied to the power transistor 72 through the power transistor 72, and this current turns the transistor 72 ON. This causes a primary coil current to flow from the battery 66 to the ignition coil 68. At the fall of this pulse current, the transistor 74 is turned off and a high voltage is generated in the secondary coil of the ignition coil 58.

This high voltage is distributed via the power distributor 70 to each of the spark plugs 52 in each cylinder of the engine in synchronization with the engine rotation.

Figure 4 shows the exhaust gas recirculation (hereinafter referred to as EGR) system (11
) This is for explaining the stem, in which a constant negative pressure from a negative pressure source 80 is applied to a control valve 86 via a pressure control valve 84. The pressure control valve 84 is applied to the transistor 9o to repeatedly turn on the sipulus.
According to the duty ratio, the ratio of the constant negative pressure of the negative pressure source to the atmosphere 88 is controlled, and the application state of the negative pressure to the control valve 86 is controlled.

Therefore, the negative pressure applied to the control valve 86 is constant at the ON duty ratio of the transistor 90. Due to the controlled negative pressure of the constant pressure valve 84, the EGR from the exhaust pipe 1o to the intake pipe 6, -
JR' is controlled.

FIG. 5 is an overall configuration diagram of the control system.

A CPU 102, a read-only memory 104 (hereinafter referred to as ROM), and a random access memory 106 (
The CPTJ 102, which is composed of a RAM (hereinafter referred to as RAM) and a person output circuit 108, calculates the input voltage from the input/output circuit 108 using various programs stored in Fl and OM2O3, and replays the calculation results. The signal is returned to the input/output circuit 108. Intermediate storage required for these operations uses I-1, AM 106. CPUI 02,
ROMI 04, R, AM106, (12) Exchange of various data between the input/output circuit 108 is performed by data/
This is done by a pass line 110 consisting of a bus, a control bus, and an address bus.

The input/output circuit 108 inputs and outputs 1-pit information to a first analog-to-digital converter (hereinafter referred to as ADCI), a second analog-to-digital converter (hereinafter referred to as AI (hereinafter referred to as C2)), and an angle signal processing circuit 126. It has an input means with a discrete input/output circuit (hereinafter referred to as DIO) for the purpose of doing so.

The ADCI includes a battery voltage detection sensor 132 (hereinafter referred to as VB).
(hereinafter referred to as TWS) and cooling water temperature sensor 56 (hereinafter referred to as TWS)
, atmospheric temperature sensor 112 (hereinafter referred to as TAS), adjustment voltage generator 114 (hereinafter referred to as VR8), throttle angle sensor 116 (hereinafter referred to as θTHS), and λ sensor 118 (hereinafter referred to as θTHS).
The output from the multiplexer 12o (hereinafter referred to as λS) is
MPX 120 selects one of these and inputs it to an analog-to-digital conversion circuit 122 (hereinafter referred to as ADC).

The digital value that is the output of the ADC 122 is stored in the register (1
3) It is held at 124 (hereinafter referred to as REG).

Further, the flow rate sensor 24 (hereinafter referred to as AFS) is input to the ADC 2, and is digitally converted via an analog-to-digital conversion circuit 128 (hereinafter referred to as T-'ADC) to the register 13o (hereinafter referred to as 1. EG).

An angle sensor 146 (hereinafter referred to as ANGS) sends a signal indicating a reference crank angle, for example, 180 degrees crank angle (hereinafter referred to as R
EF) and a signal (hereinafter referred to as Pos) indicating a minute angle, for example, a crank angle of 1 degree, are outputted and applied to the angle signal processing circuit 126, where they are waveform-shaped.

DI OK is the idle switch 148 (hereinafter referred to as IDL)
(hereinafter referred to as TOP-8W) and top gear operation switch 150 (hereinafter referred to as TOP-8W, !) tostarter suite-F-
152 (hereinafter referred to as S'l', 'IT-SW') is input.

Next, a pulse output circuit and a controlled object based on the calculation results of the CPU will be explained. Injector control circuit ('I
NJC) is a circuit that converts the digital (14) value of the calculation result into a pulse output. Therefore, the pulse width corresponding to the fuel injection amount is
C134 and is applied to the injector 12 via an AND gate 136.

The ignition pulse generation circuit 138 (hereinafter referred to as IGNC) includes a register (hereinafter referred to as ADV) for setting the ignition timing and a register (hereinafter referred to as D) for setting the primary current supply start time of the ignition coil.
These data are set by the CPU. AND gate 140 generates a pulse based on the set data and sends it to amplifier 68, detailed in FIG.
Apply this pulse via.

The opening rate of the bypass valve 62 is determined by the control circuit (hereinafter referred to as 18CC).
) 142 through an AND gate 144.

l5CC142 is a register l5C that sets the pulse width.
D and a register l8CP for setting the repetition pulse period.

As shown in FIG. 4, a value representing the duty of the pulse is set in the main circuit 180 (hereinafter referred to as EGl (referred to as C)). Set registers EGR and D and a value representing the pulse repetition period.
It has GRP. This EGR,C output pulse is applied to transistor 90 via AND gate 156.

Further, the 1-bit input/output signal is controlled by the circuit DIO. Input signals are IDLE-8W signal, TOP-8
There are W signal, 8'I"AR, and 'r-8W signal.

Further, the output signal includes a pulse output signal for driving the fuel pump. This DIO is provided with a register DD for determining whether a terminal is used as an input terminal or an output terminal, and a register DOtJT for latching output data.

The register 160 is an input/output port [register (hereinafter referred to as MOD) that holds instructions for commanding various internal states of the input/output port [108]
For example, by setting a command in this register, all the AND gates 136, 140, 144, and 156 are turned on (16) and turned off. By setting the command in the MOD register 160 in this way, INJC and I
It is possible to control the stop and start of output of GNC and 15CC.

FIG. 6 is a diagram showing the basic configuration of a program system for the control circuit shown in FIG. 5.

In the figure, an initial processing program 202, an interrupt processing program 206, a macro processing program 228, and a task dispatcher 208 are management programs for managing a group of tasks.

The initial processing program 202 is a program for performing preprocessing for operating the microcomputer. , and further performs processing for inputting data such as cooling water temperature Tw and battery voltage, etc., for performing preprocessing necessary for engine control. Further, the interrupt processing program 206 accepts various interrupts, analyzes the cause of the interrupt, and processes the task groups 210 to 17.
) Issues an activation request to the task dispatcher 208 to activate the necessary tasks among the tasks 226. Interrupt factors include input information such as power supply voltage and cooling water temperature f:A as described later.
AD conversion interrupt (p, DC) that occurs after D conversion is completed,
Initial interrupt (IN) that occurs in synchronization with engine rotation
TL), and every set period of time, for example l Qms
There is an interval interrupt (INTV) that occurs every time the engine stops, and an engine stall interrupt (EMST) that occurs when the engine is stopped.

Each task in the task groups 210 to 226 is assigned a task number representing a priority order, and each task belongs to one of task levels 0 to 2. That is, tasks 0 to 2 are at task level O, and task 3 is at task level O.
Tasks 5 to 5 belong to task level 1, and tasks 6 to 8 belong to task level 2, respectively.

The task dispatcher 208 receives the activation requests for the various interrupts, and allocates the (18) occupied time of the CPU based on the priorities assigned to the various tasks corresponding to these activation requests.

Here, task priority control by the task dispatcher 208 is based on the following method. (1) A task with a low priority is interrupted and the execution right is transferred to a task with a high priority only between task levels. Note that level O has the highest priority here. (2) If there is a task currently being executed or suspended within the same task level, this task has the highest priority and other tasks cannot operate until this task is completed. (3) If there are activation requests for multiple tasks within the same task level, the smaller the task number, the higher the priority. The processing contents of the task dispatcher 208 will be described later, but in the present invention, in order to perform the above-mentioned priority control, a soft timer is provided for each task, and a control block for managing tasks on a task level basis is provided in R.
, AM. Then, each time the execution of each task is completed, the task execution completion report is sent to the macro processing program 228 by the task dispatcher 2.
I am planning to do it in 2008.

(19) Next, the processing contents of the task dispatcher 208 will be explained based on FIGS. 7 to 13. 11, which is managed by the task dispatcher 208, is provided in AM t1
A data task control block is provided. The number of task control blocks equal to the number of task levels is provided, and in this embodiment, three task control blocks are provided at task levels 0 to 2.

Eight bits are assigned to each control block, of which the 0th to 2nd bits (Qo to Q2)! f is a startup bit that displays the startup request task, and the 7th bit (R1
represents an execution bit indicating whether a task is currently being executed or suspended, and the activation bit Q is in the same task level. The fishing rods Q2 are arranged in descending order of execution priority in each task level. For example, the activation bit corresponding to task 4 in FIG. 6 is Q of task level 1. If there is a request to start a task, a flag is set in the start bit, and on the other hand, the task dispatcher 208 sends the issued start request to the start bit (20) corresponding to a higher level task. The tasks are searched in order, and the flag corresponding to the issued activation request is reset, the execution bit is set to flag 1, and processing is performed to activate the corresponding task.

In FIG. 8, the task dispatcher 208 manages)l,
This is a start address table provided in AM106. Start addresses SAO to SA8 indicate the start addresses corresponding to each task 0 to 8 of the task groups 210 to 226 shown in FIG. 16 bits are allocated to each start address information, and these start address information are used by the task dispatcher 208 to start the corresponding task that has been requested to start, as will be described later.

Next, FIGS. 9 and 10 show the processing flow of the task dispatcher. In FIG. 8, when the process of the task dispatcher is started in step 300, it is determined in step 302 whether or not the execution of a task belonging to task level t is being suspended. In other words, if the execution bit is set to 1, it means that the task completion report has not yet been sent to the task dispatcher 208 by the macro processing programmer (21) 228, and the task that was currently being executed receives an interrupt with a higher priority level. Indicates a situation in which the process has been interrupted due to an occurrence.

Therefore, if 7 lag 1 is set in the execution bit, the process jumps to step 314 and restarts the interrupted task.

On the other hand, if flag 1 is not set in the execution bit, that is, the execution display flag is reset, step 304
Then, it is determined whether there is a task waiting to be started at level t. That is, the activation bits of level t are searched in the order of the execution priority of the corresponding task, that is, in the order of Q, Q, , Q2. If flag 1 is not set in the activation bit belonging to task level t, the process moves to step 306, and the task level is updated. That is, the task level t is +
It is incremented by 1 and set to t+1. When the task level is updated in step 306, the process moves to step 308, where it is determined whether all task levels have been updated. If all levels have not been ticked (22), that is, if t is not 2, the process returns to step 302 and the above procedure is similarly performed.

If all the task levels have been checked in step 308, the process moves to step 310 and the interrupt is canceled. That is, steps 302 to 308
Since interrupts are prohibited during the processing period up to this point, interrupts are canceled at this step. And next step 31
2 waits for the next interrupt.

Next, in step 304, if there is a task waiting to be activated at task level t, that is, if flag 1 is set in the activation bit belonging to task level t, the process moves to step 400. In the loop of steps 500 and 502, which activation bit of the task level t has the flag 1 set is determined in the order of the corresponding priority execution level, ie, Q. t Qt
+ Search in the order of Q2. Once the relevant activation bit has been determined, the process moves to step 404. In step 404, the flagged activation bit is reset, and the execution bit of t (hereinafter referred to as the R bit (23) bit) of the relevant task level is set to 7. Set up rug 1. (In step 406, the starting task number is determined, and in step 408, the start address information of the corresponding starting task is extracted from the start address table shown in FIG. 8 and provided in fR, AM.

Next, in step 410, it is determined whether or not to execute the corresponding startup task. Here, if the retrieved start address information is a specific number, for example O, it is determined that the corresponding task does not need to be executed. This determination step is necessary to selectively provide the function of only a specific task to each vehicle type among the task group that performs engine control. If it is determined in step 410 that the execution of the corresponding task is stopped, the process moves to step 414;
The R bit of the corresponding task level t is reset. Then, the process returns to step 302 and it is determined whether the task level t is suspended. This is possible if the flag is set in the activation bit of the same task level, so the R bit '6 is reset in step 414 and then the process moves to step 302 (24). There is.

On the other hand, in step 410, if the execution of the relevant task is not stopped, that is, if it is to be executed, the process moves to step 412, jumps to the relevant task, and the task is executed.

Next, FIG. 11 is a diagram showing the processing flow of the macro processing program 228. The program consists of steps 562 and 564 to find the finished task. In steps 562 and 564, the task level is first searched from 0 to find the completed task level. As a result, the process advances to step 568, where the execution (R, UN) flag in the 7th bit of the task control block of the completed task is reset.

This means that the task has been completely executed. Then, the process returns to the task dispatcher 208 again and the next task to be executed is determined.

Next, the manner in which tasks are executed and interrupted when task priority control is performed by the task dispatcher 208 will be explained based on FIG. 12. Here, m in activation request N0 represents the task level, and n represents the priority order within task level m (25). Assuming that the CPU is currently executing the management program O8, a startup request N is issued while this management program O8 is being executed.
2. If this occurs, execution of the task corresponding to the activation request N21, that is, task 6, is started at time T. Here, while task 6 is being executed, at time T, a request N is made to start a task with a higher execution priority. 1 occurs, the execution moves to the management program O8, and after performing the predetermined processing described above, a startup request N is issued at time T. Execution of the task corresponding to , ie, task O, is started. During the execution of this task 0, a start request N1 was issued at time T4. When the task 0 is entered, the execution is once transferred to the management program O8, predetermined processing is performed, and after t, the execution of the suspended task 0 is resumed again at time T. When the execution of task 0 ends at time T, the execution moves again to the management program O8, where the macro processing program 228 reports the completion of execution of task 0 to the task dispatcher 208, and the task is again waiting to be started at time T. Startup request N1. The execution of task (26) 3 corresponding to is started. The time T when this task 3 is being executed,
, a lower priority activation request N of the same task level 1,
If 2 is entered, the execution of task 3 is temporarily interrupted and the execution moves to the management program O8, after which predetermined processing is performed.
Execution of task 3 is resumed at time T. and time T
,. When the execution of task 3 is completed, the execution of the CPU shifts to the management program O8 and the macro processing program 228
The completion of execution of task 3 is reported to task dispatcher 208, and then, at time Tl+, execution of task 4 corresponding to activation request N1□ with a low priority level is started, and at time T1. When the execution of task 4 is completed, the execution is transferred to the management program O8, and after predetermined processing is performed, the startup request N2. Execution of task 6 corresponding to is resumed from time 'I'ts.

Priority control of tasks is performed in the manner described above.

FIG. 12 shows state transitions in task priority control.

The l:dle state is a state of waiting for activation, and no activation request has been issued to the task yet. Next, when a startup (27) request is issued, a flag is set in the startup bit of the task control block, indicating that startup is necessary. 1d
The time required to move from the le state to the queue state is determined by the level of each task. Furthermore, Q u e u e
They are executed even if the state changes, and the order is determined by priority. The task enters the execution state using the management program O8.
The activation bit flag of the task control block is reset in the task dispatcher 208, and the R bit (7
This is after the flag is set on bit 1). This will start the task execution. This state is the )l,UN state.

When the execution is completed, the R bit flag of the task control block is cleared, and the completion report is ended.

This ends the RUN state and enters the idle state, waiting for the next activation request. However, if an interrupt IR,Q occurs during the execution of a task, ie, during T-1,UN, the task must interrupt its execution. Therefore, the contents of the CPU are saved and execution is interrupted. This state is the 1 (ready) state. Next, when this task becomes ready to be executed again, the saved contents are returned to the CPU and execution is resumed. 9 R, U again from Ready state
Return to N state. In this way, each level program is the 12th
Repeat the four states shown in the figure. Although FIG. 12 shows a typical flow, there is a possibility that the start bit of the task control block will be flagged in the Ready state. This is the case, for example, when the next activation request timing for the task comes while the activation is being suspended.

At this time, priority is given to the flag of the R5 bit, and the suspended task is first terminated. As a result, the flag of the J)R bit disappears, and the state enters the QUEUE state without passing through the SIE state due to the flag of the activation bit.

In this way, tasks 0 to 8 are each in the collapsed state shown in FIG.

Next, FIG. 14 shows a specific embodiment of the program system shown in FIG. In the figure, the management program O8 includes an initial processing program 202, an interrupt processing program 206, a task dispatcher 208, and a macro processing program 228.

(29) The interrupt processing program 206 includes various interrupt processing programs, and the initial interrupt processing (hereinafter referred to as INTL interrupt processing) 602 uses an initial interrupt signal generated in synchronization with engine rotation to control the number of engine cylinders per engine rotation. If there are half the number of cylinders, that is, 4 cylinders, the initial interrupt will occur twice. By this initial interrupt, the EGI task 612 calculates the fuel injection time and sets it in the EGI register of the input/output interface circuit 108 . There are two types of AD conversion interrupt processing 604, one is AD
Converter 1 interrupt (hereinafter abbreviated as ADC1) and AD conversion 6
2 interrupt (hereinafter abbreviated as ADC2). AD converter 1
has an accuracy of 8 pits, and is used for inputting power supply voltage, cooling water temperature, intake air temperature, usage adjustment, etc., and starts conversion at the same time as specifying the input point to multiplexer 120, and interrupts ADC1 after conversion is completed. occurs. Note that this interrupt is used only before cranking. Also A
D converter 128 is used to input the air flow rate and generates an AD02 interrupt after the conversion is completed. (30) Oh, the car side is also used only before cranking.

Next, the interval interrupt processing program (hereinafter INTV)
It is referred to as an interrupt processing program. ) 606, the INTV interrupt signal is used for the time set in the INTV register, for example, 10
This signal is generated every m5 and is used as a basic signal for time monitoring of tasks that should be started at regular intervals. The soft timer is updated in response to the side-by-vehicle signal, and the mask is activated when the specified cycle has been reached. The engine stall interrupt processing program (hereinafter referred to as ENST interrupt processing program) 608 detects the stopped state of the engine, and when an INTL interrupt signal is detected, it starts counting and starts counting the next engine within a predetermined period of time, for example, 1 second. When an interrupt signal cannot be detected,
EH11 interrupt occurs. And BNST interrupt is 3
If the INTL interrupt signal is not detected after 3 seconds, for example, it is determined that an engine stall has occurred, and the ignition coil is energized and the fuel pump is stopped. After these processes, the process waits until the starter switch 152 is turned on. Table 1 shows the processing outline (31) for the above interrupt factors.

Table 1 Outline of processing for interrupt factors The initial processing program 202 and macro processing program 228 perform the processing as described above.

The task groups activated by the various interrupts mentioned above are as follows. Tasks belonging to task level 0 include a fuel cut processing task (hereinafter referred to as As task), a fuel injection control task (hereinafter referred to as EGI task), and a start monitor task (hereinafter referred to as MONIT task (32)). Also, tasks belonging to task level 1 are A, D 1-person task (hereinafter referred to as ADINI task), and time coefficient processing task (hereinafter referred to as AF'SIA task).
There is. Historically, tasks belonging to task level 2 include an idle rotation control task (hereinafter referred to as ISC task), a correction calculation task (hereinafter referred to as HO8EI task), and a start preprocessing task (hereinafter referred to as 15TRT task).

Table 2 shows the assignment of each task level and the function of the task.

(33) As is clear from Table 2, the activation cycle of each task activated by various interrupts is determined in advance, and this information is stored in the ROM 104.

Next, the signal processing method of the hot wire flow sensor and fuel injection control will be explained. FIG. 15 shows signal processing of the hot wire flow rate sensor used in the present invention. The instantaneous air flow rate QA can be calculated from the hot wire output voltage V using equation (5).

Since this instantaneous air flow rate qA exhibits a pulsating state as shown in FIG. 15, it is sampled at fixed time intervals Δ. The average air flow rate Q^ is calculated from the instantaneous air flow rate QA using the following equation.

nm Δ t ΣqA11 2 □ (8) For the air flow rate sucked into the cylinder, calculate the integrated flow rate using equation (8). Next, fuel injection control will be explained. The fuel injection of the present invention does not calculate the injection amount per revolution as shown in equation (7) (35), but
Fuel is injected when the cumulative flow rate reaches a certain value. 1st
Figure 6 shows the fuel injection timing.

The instantaneous air flow rate qA is integrated at fixed time intervals, and when the integrated flow rate value exceeds the integrated flowmeter level Q, the air charge is injected for a fixed time period t. First, the fuel injection timing is when the flow 1 integrated value reaches the integrated flow rate level. This integrated flow level Q,11 is Q l,! When Qt3 is set, the air-fuel ratio (A/F) becomes rich, and when Qt3 is set, the air-fuel ratio becomes lean. The present invention shifts this integrated flow level to
The air-fuel ratio can be adjusted arbitrarily. In other words, it is necessary to enrich the air-fuel ratio during warm-up during startup.
This can be achieved by reducing the cumulative flow level. Also, 0
In order to always optimally control the air-fuel ratio using the output of the 02 sensor, this can be achieved by adjusting the integrated flow level according to the 0N-OF'F of the 02 sensor output.

FIG. 17 shows a processing flow for signal acquisition and injection timing of such a hot wire type flow l sensor.

In the figure, first, at step 801, it is determined whether or not there is an INTL interrupt (36). In the case of an INTL interrupt, IGN BEG is set in step 802, and the INTL interrupt processing program is terminated. Also,
If it is determined in step 801 that the interrupt is not an INTL interrupt, it is determined in step 805 whether or not it is a QA timer interrupt. In the case of this timer interrupt, step 806
, start up to import the hot wire flow rate sensor,
In step 807, a hot wire flow rate sensor is taken in.

In step 808, the instantaneous air flow i expressed by equation (5) is
QA is calculated and integration processing is performed in step 809. In step 810, it is determined whether the integrated value of the instantaneous air flow rate has reached the integrated flow rate level. If the integrated flow rate level is reached, an injection time t is set in EGI BEG in step 811, and fuel injection is started in step 812. In step 813, the difference between the cumulative flow rate and the cumulative flow rate level is set as the current cumulative flow rate. In step 805 %
If it is not a timer interrupt for Q', it is determined in step 815 whether it is an ADC interrupt. In step (37) 815, if it is an ADC interrupt, the process goes to step 816 to determine whether the IS'l'' flag is 1, and if the IST flag is 1, the process goes to step 817. Then, the hot wire flow rate sensor is activated and read in. The flow rate value obtained by this reading is used to detect overloading.Also, if step 815 fails and there is no ADC interrupt, step 816 In this case, if the ST flag is not 1, the IN'rV interrupt processing 60 in FIG.
Move on to 6.

Next, depending on the output value from the engine coolant temperature sensor,
That is, FIG. 18 shows a characteristic diagram in which the air flow l comparison level is changed depending on the engine cooling water temperature. That is, -40tZ' to 40t? is a cold start and a warm-up operation level. Moreover, 40C to 85tr is a normal starting level, and 851: or more is a hot restart level. This air flow comparison level is determined before start-up, i.e.
Immediately after turning on the engine key, the water temperature is taken in and the air flow rate comparison level with respect to the water temperature is calculated from FIG. 18 and the level is set. This operation is performed by the IS'l''RT program (3
8) will be processed.

Next, processing during acceleration will be explained using FIGS. 19 to 22.

FIG. 19 shows a fuel control flow during acceleration from an idling state or after deceleration. That is, first, in step 901, it is determined whether or not the idle switch is ON. If it is ON, step 902 is performed.
A flag is set in step 903. Also, in step 901, the idle switch is turned OFF.
If it is determined that this is the case, the throttle opening degree is detected in step 903 and stored in R and AM. Next step 90
Throttle opening currently detected in 4 and 30μ (5)
It is compared with the previously captured throttle opening to determine whether the peek value is large or not, that is, whether or not it is in an acceleration state. If it is not acceleration, the process moves to step 910, and if it is determined that the speed is at the knife speed, then in step 905, acceleration correction amount 1, that is, the acceleration correction amount accompanying the increase in the normal intake air amount, is calculated, and the flag of this acceleration correction amount is set. It is determined in step (39) 906 whether or not 1 is set. When the flag is set to 1, in step 907, a value multiplied by the acceleration correction amount 1 is set as the acceleration correction amount. If the flag is not set to 1, the acceleration correction amount 1 is set as the acceleration correction amount in step 908.

Next, in step 909, acceleration correction is performed, and in step 910, it is determined whether or not the idle switch is OFF, and if it is OFF, the flag is reset.

This makes the acceleration after idling or deceleration twice as large as during other accelerations.

Further, during acceleration, acceleration correction injection is performed as shown in FIG. 20(A). However, since the fuel is delayed, the fuel becomes leaner and the amount of solvent becomes insufficient as shown in FIG. 20(B). For this reason, conventional attempts have been made to increase the amount of fuel during acceleration to eliminate the lean state during acceleration. However, as shown in FIG. 20(C), if the acceleration increase is a constant amount during acceleration, the latter half of the power-low speed becomes rich. Therefore, in this embodiment, as shown in FIG. 20 (D), the amount is increased (
40) Thick comb, the amount of correction gradually decreases in the later stages.

This flowchart is shown in FIG.

That is, it is activated by an interval interrupt that occurs every 10m58c, and in step 1050 it is determined whether or not acceleration is occurring.If it is determined that acceleration is occurring, in step 1051, a correction amount for acceleration and an initial value are calculated.

Next, in step 1052, the number of corrections is set in a counter. Next, in step 1053, it is determined whether or not a rotation angle signal is input every 180 crank angles of the engine. When a rotation angle signal is input, the counter is decremented by 1 in step 1054, and the corrected initial value is set in step 1055. A correction amount that decreases linearly from the counter value is calculated. Next, in step 1056, the acceleration correction amount calculated in step 1055 is added to the basic injection amount and set in a register. Next, step 1
At step 057, it is determined whether the counter value is O or not, and if it is determined not to be 0, the process returns to step 1053.

In addition, in this example, in the case of slow acceleration (long acceleration period of 200 m5ec to 500 m% (41)), the number of acceleration detections (detected once every 10 msec) is large; Since interrupt injection is performed each time, the first interrupt injection is performed during one acceleration, and no interrupt injection is performed even if acceleration is detected thereafter. This control flowchart is shown in FIG. That is, in step 1001, the throttle opening degree is captured by an interval interrupt every romseo, and this throttle opening degree is AD converted and stored in T(, AM.Next, this throttle opening degree T
H and throttle opening TR taken 30m5ec ago (
In step 1002, the difference JTyr with respect to OLD) is determined.

In step 1003, it is determined whether the value of ΔTH is greater than level 1 (throttle opening 1° to 2.5°), and if it is determined not to be larger, flag 1 is reset in step 1004. If ΔTR is larger than level 1, it is determined in step 1005 whether it is larger than level 2 (throttle open [2.5° to 5°). If it is determined in step 1005 that it is small, a value of 1 is searched in the correction coefficient determined by the water temperature (42) (step 1006), and an acceleration correction amount corresponding to the level 2 is calculated in step 1007.
8, it is determined whether flag 1 is O or not. If it is determined in step 1008 that flag 1 is not 0, the process exits. Further, if it is determined that flag 1 is O, interrupt injection is performed in step 1009, and step 10
10, flag 1 is set.

Further, if it is determined in step 1005 that ΔTH is thicker than level 2, in step 1011, ΔT
It is determined whether H is greater than level 3 (throttle opening IJj 5° to 7°). If it is determined in step 1011 that ΔTo is not greater than level 3, in step 1012 a map search of 1 is performed on a correction coefficient determined from the water temperature. In step 10J3, an acceleration correction amount corresponding to level 3, which is the addition of the standard acceleration correction amount based on 1, is calculated in step 10J3, and in step 1014, it is determined whether flag 2 is O or not. If it is determined in step 1014 that flag 2 is (43) 0, interrupt injection is performed in step 1015, and flag 2 is set in step 1016.

Further, if it is determined in step 1011 that ΔTH is greater than level 3, in step 1017 ΔTH
It is determined whether or not is equal to level 4 (throttle opening degree of 7 degrees or more). If it is determined in step 1017 that they are not equal, then in step 1018 a map is searched for the correction coefficient fixed depending on the water temperature, and in step 1019 an acceleration correction amount corresponding to level 4 is calculated. Next, in step 1020, it is determined whether or not flag 3 is 0. If it is determined that it is not 0, interrupt injection is performed in step 1021, and flag 3 is set in step 1022. Note that the acceleration correction amount differs depending on each level.

Further, if it is determined in step 1017 that ΔT is equal to level 4, a map is searched for a correction coefficient determined from the water temperature in step 1023, an acceleration correction amount is calculated in step 1024, and an interrupt is performed in step 1025. Perform injection.

The INTV interrupt processing will be explained below based on FIGS. 23 to 25. FIG. 20 shows a soft timer table provided in the RAM 106, and this soft timer table is provided with as many timer blocks as the number of different activation cycles activated by various interrupts. Here, the timer block refers to a storage area to which time information regarding the activation cycle of tasks stored in the ROM 104 is transferred. TM who died in the same figure and is written on the left end
B means the starting address of the soft timer table in the RAM 106. To each timer block of this soft timer table, time information regarding the startup cycle is transferred from the RAM 106 when the engine is started, that is, when an INTV interrupt is performed, for example, every IQms, a value that is an integer multiple of the time information is transferred from the RAM 106.
Stored.

Next, FIG. 24 shows the processing flow of INTV interrupt processing 606. In the same figure, when the program is started at step 626, the I(, initialization (45) of the soft timer table provided in AM106) is performed at step 628. That is, the content i of the index register is set to 0. Address T of the soft timer table
The remaining time T stored in the timer block of M B + O is checked. Here in this case lj: T t
= '11' o. Next, in step 630, it is determined whether the soft timer checked in step 628 is stopped. That is, if the remaining time T1 stored in the soft timer table is T1=0, it is determined that the soft timer is stopped, and the corresponding task to be started by the soft timer is stopped. It is determined that the process jumps to step 640, and the soft timer table is updated.

On the other hand, the remaining time T in the soft timer table is T,\0
If so, the process moves to step 632 and the remaining time of the timer block is updated.

Ill, the remaining time T is decremented by -1. Next, in step 634, it is determined whether the soft timer in the timer table has reached its activation cycle. That is, if the remaining time T, is T,=0 (46), it is determined that the activation period has been reached, and in that case, the process moves to step 636. If it is determined that the soft timer has not reached its activation period, the process jumps to step 640, and the soft timer table is updated. If the soft timer table has reached the activation period, the remaining time T1 of the soft timer table is determined in step 636.
Initialize. That is, 'R,0M104 to RAM1
The time information of the activation cycle of the corresponding task is transferred to 06. After initializing the remaining time T in the soft timer table in step 636, a request is made to start the task corresponding to the soft timer table in step 638. Next, in step 640, the soft timer table is updated. That is, the contents of the index register are incremented by +1. Further, in step 642, it is determined whether all soft timer tables have been checked. That is, as shown in FIG. 24, in this embodiment, only N+1 soft timer tables are provided, so if the content i of the index register is i=N+1, all (47) soft timer tables have been checked. It is determined that the INTV interrupt processing program 606 is terminated in step 644. On the other hand, if it is determined in step 642 that all soft timer tables have not been checked, the process returns to step 630 and the same process as described above is performed.

As described above, a request to start the relevant task is issued in response to various interrupts, and the relevant task is executed based on the request, but all of the task groups listed in Table 2 are always executed ( ri, selects the time information regarding the activation cycle of the task group provided in the R,0M 104 based on the engine operating information, and transfers and stores it in the soft timer table of the FtAM 106. For example, if the activation cycle is 20m5, a task will be activated every time, but if the task needs to be activated continuously depending on the operating conditions, then the software corresponding to that task will be added to n. The timer table is updated and initialized.Next, how the task (48) group is started and stopped by various interrupts depending on the engine operating conditions will be explained with reference to the time chart shown in FIG.25.Starter switch 152 (Figure 5)
When the power is turned on by the operation, the CPU is activated and 1 is set in the software flag IS'll' and the software flag EM. Software flag IST
is a flag indicating that the engine is in a pre-start state, and software flag EM is a flag for prohibiting ENS'I' interrupts. These two flags are used to determine whether the engine is in a pre-starting state, in a starting state, or in a post-starting state. Now, when the engine is turned on by operating the starter switch 152, the task ADINI is activated first, and input information such as cooling water temperature, battery voltage, etc. necessary for starting the engine is inputted via the multiplexer 120 to AD conversion by various sensors. The task HO8EI task correction is activated every time these data are inputted once to the device 122, and correction calculations are performed based on the input information. Also, the task AD
According to INI, task 15T)LT is started every time data (49) is input to the 9AD converter 122 from various sensors, and the fuel injection amount required during engine starting is calculated.

The above three tasks, namely task ADIN1 and task H
O8EI and task ISTR,T are started by the initial processing program 202.

When the starter switch 152 is turned on, task l5
Three tasks, register ADINI, task MONIT, and task ADIN2, are activated by the interrupt signals TR and T. That is, these tasks need to be executed only while the starter switch 152 is in the ON state (during cranking of the engine). During this period, time information of a predetermined activation cycle is transferred from the ROM 104 to a soft timer table provided in the RAM 106 that corresponds to each of the tasks and is stored therein. During this period, the remaining time TI of the activation cycle in the soft timer table is initialized and the activation cycle is repeatedly set.

Task MONI'[' is a task to calculate the fuel injection amount when starting the engine, and it is unnecessary after the engine starts, so it is only required to run a predetermined number of times (50). When the execution of Suff is finished, start the soft timer. stop,
A stop signal issued at the end of the task activates a group of tasks other than those mentioned above that are required after the engine is started. In order to stop a task using a soft timer, a signal indicating that the task has ended is stored at 0'' in the soft timer table corresponding to the task at the time when the task is determined to have ended. The register is stopped by clearing the contents of the soft timer.

Therefore, since the configuration is such that tasks can be easily activated and stopped using a soft timer, it is possible to efficiently and reliably manage a plurality of tasks having different activation cycles.

Next, FIG. 26 shows a 1-liter Q generation circuit. register 73
5, a counter 736, a comparator 737, and a flip-flop 738 are an INTV IRQ generation circuit, and the INTV IRQ generation cycle is set in the register 735, for example, 10 [ms] in this embodiment. In response, a clock pulse is set to the counter 736, and when the count value matches the register (51) 735, the flip-flop 738 is set. In this set state, the counter 736 is cleared and counting is restarted again. Therefore, for a certain period of time (10ms
INTV II(,Q,) occurs every time,ec).

A register 741, a counter 742, a comparator 743, and a flip-flop 744 are an ENS that detects engine stoppage.
This is a T IRQ generation circuit. The register 741, counter 742, and comparator 743 are the same as described above,
When the count value reaches the value of register 741, ENST
Generates an IRQ. However, while the engine is rotating, a constant 1% E is generated for each rank angle based on the crank angle sensor.
Since the counter 742 is cleared by the F pulse, the count value of the counter 742 does not reach the value of the register 741, so the ENST IRQ is not generated.

INTVIRQ generated in flip-flop 738 and ENST I) (Q) generated in flip-flop 744.
Further, IR and Q generated in ADCI and AI) C2 are set in flip-flops 7 (52) 746, 764, and 768, respectively. Also, flip-flops 737, 745, 762, and 766 have IRQ.
A signal is set to enable or prohibit the occurrence of Flip-flops 737, 745.

If °゛H'' is set in 762 and 766, AND
Gates 748, 750, 770, 772 are active p,
When In and Q are generated, IRQ is generated immediately by the OR gate.

Therefore, 7 lip-flops 737, 745.

7 62, 7 66 (7) 11. Ill, Q. depending on whether KuH" or L"' is entered respectively. If you have prohibited the occurrence of this, you can cancel the prohibition. Furthermore, when IR and Q occur, the cause of the IRQ occurrence can be determined by loading the contents of seven lip-flops 740, 745, 764, and 768 into the CPU.

When the CPU starts executing a program in response to IRQ, the IR and Q signals need to be cleared. Flip flow regarding Q; Tube 740,7
Clear one of 46,764,768.

(53) [Effects of the Invention] As explained above, according to the present invention, optimal engine control can be performed during acceleration.

[Brief explanation of drawings]

Fig. 1 is an output characteristic diagram of the hot wire output voltage V with respect to the crankshaft rotation angle, Fig. 2 is a configuration diagram showing the control device of the entire engine system, Fig. 3 is an explanatory diagram of the ignition system in Fig. 2, and Fig. 4 The figure is a block diagram for explaining the exhaust gas recirculation system, Figure 5 is an overall block diagram of the engine control system, and Figure 6 is a block diagram for explaining the exhaust gas recirculation system.
The figure shows the basic configuration of the program system of the engine control method according to the present invention, FIG. 7 shows a table of task control blocks provided in R and AM managed by the task dispatcher, and FIG. 8 shows various types of task control blocks. A diagram showing a start address table of a task group activated by an interrupt,
Figures 9 and 10 are diagrams showing the processing flow of the task dispatcher, Figure 11 is a diagram showing the processing flow of the Mac and mouth processing program, Figure 12 is a diagram showing an example of task priority control, and Figure 13 is a diagram showing the processing flow of the task dispatcher. A diagram showing the state transition (54) of the task in the above task priority control, FIG. 14 is a diagram showing the specific flow in FIG. 6, and FIG. 15 is a diagram showing the hot wire output voltage acquisition timing. , Fig. 16 is a diagram showing the intake air flow rate and injection timing showing an embodiment of the present invention, Fig. 17 is a flowchart of interrupt processing, Fig. 18 is a diagram showing comparison level change depending on water temperature, and Fig. 19 is a diagram showing acceleration. Flowchart of Time, No. 20
The figure shows the acceleration correction time chart, Figure 21 is the flowchart of Figure 20, Figure 22 is the fuel increase flowchart during acceleration, Figure 23 is a diagram showing the soft timer table provided in R and AM, and Figure 24 is the flowchart of Figure 20. FIG. 25 is a processing flowchart of the INTV interrupt processing program, FIG. 25 is a timing chart showing how various tasks are activated depending on the operating state of the engine, and FIG. 26 is an interrupt IRQ generation circuit diagram. 102...CPU, 104...ROM, 106...
・RA-M. 602...IN'I'L interrupt processing, 610...Air amount signal (55) Fan 3 diagram Fan 4 (¥1 Figure 7 5i2) Starting on the 8th Figure 9 / Q diagram Funeral II diagram early /9 Figure 2θ Figure 5et Early 21 National Patent Publication No. 59-74337 (22) No. 22 Figure Early 23rd Day 24th Otsu 26 Soft gusset - 9-421 Nyarai Otsu 2
3ru -〇630 Soft timer 4 on the way. . Soft timer tape j to L ・0 ゛゛32 9 口q IS! ＋ history ``11-/→tL Otsu 34 ``ψka ``■Sweet...shiEshi-ka ~
・6 Otsu ・O es 636 Software 1, timer table tbt J sword H month Issuing Otsu 38# Start of the task

Claims (1)

[Scope of Claims] 1. In a fuel injection device equipped with means for detecting the opening degree of a throttle valve at fixed time intervals, detecting a difference at predetermined time intervals, and detecting a tip speed state, the detected difference is predetermined. means for detecting which of the four levels it belongs to;
A fuel injection device characterized by comprising means for additionally injecting a correction amount according to a detected level. 2. The fuel injection device according to claim 1, wherein the correction amount is a predetermined times the correction amount during normal acceleration during deceleration or acceleration from idling. . 3. The fuel injection device according to claim 1 or 2, wherein the correction amount is controlled to decrease gradually from the beginning of acceleration.