JPS60122237A - Electronic engine controller - Google Patents

Abstract

PURPOSE:To shorten the time required for making arithmetic processing and prevent response delay by computing one address value from both an engine rpm and a throttle valve opening and searching both a fuel injection quantity and an iginition timing from the specified table. CONSTITUTION:When an engine runs, in a micromputer 4 a timer 5 measures an interval between pulse signals from a revolution sensor 1 by counting the number of clock pulses from an oscillator, thereby computing the rovolutional number. From said revolutional number and the opening value of a throttle valve obtained after the output of a throttle sensor 2 is subjected to A/D conversion, an address operating circuit 6 generates a specified corresponding address value and then reads both a fuel injection quantity value and an ignition timing value written at the preset address in a memory from a table look-up circuit 7 on the basis of the address value. According to those values the microcomputer 4 controls transistors 10 and 17 via a control circuit 8 so as to control operation of a fuel injection valve 9 and an ignition coil 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronic engine control device, and is mainly suitable for motorcycles.

(Prior Art) A configuration in which boost pressure and engine speed are used as engine control parameters is known. However, the boost pressure has poor responsiveness, which is a problem especially in motorcycle engines where the rotational speed fluctuates rapidly.

Also, a configuration is known in which the fuel injection amount and ignition timing are controlled, but in this case, the basic fuel injection amount uses boost pressure (or intake air amount) and engine speed as parameters, and the ignition timing is determined based on the obtained basic fuel injection amount. It is determined using the fuel injection amount as a parameter. If the fuel injection amount and ignition timing are controlled separately in this way, problems arise such as having to perform calculations for each. For this reason, the processing time becomes long, the responsiveness deteriorates, and the memory capacity becomes necessary to be increased by 10 μm, which causes the problem of high cost.

In addition, as a configuration in which one calculation result is obtained from two types of parameters and one type of control is performed based on the result, the
No. 28028 and Japanese Patent Publication No. 50-29098 are known.

([1st object of the invention] (1) An engine control device without a 1.1 inch response delay is created by using an engine control buff meter as the engine speed and throttle opening.

(2) Shorten the acid 1γ process (11) to reduce program execution speed and improve responsiveness. In addition, the ignition timing is set to that of fuel injection 1 under the same measurement conditions.

(3) Equipment for each buff meter:
Reducing production costs.

(1st difficulty of the invention) As shown in Figure 1:
Based on the 'li'i information from both of the above detection means,
One address fli'i is 'L (, output address arithmetic circuit<t+)1, one address 11' [is used, Iwakuni Futonaijiin and l, 'j, fire time I9 garden r1 Table lookup means (0) that uses the double lookup method
DomanjP control T stage (f) Electronic engine control device t! having an ignition timing control means for controlling the ignition timing of the ignition device using the above ignition timing value. It is.

(Embodiment) In FIG. 2, the rotation sensor 1 (an example of engine rotation speed detection means) is composed of a rotor installed on the crankshaft or in the distributor, and a pickup for detecting the rotation of the rotor. , sensors that employ magnetic conversion methods, etc.). The sensors 11 to 1/1/2 (an example of throttle opening means) are comprised of, for example, a variable resistor connected to a ζ throttle valve. slots l
- What is obtained from the sensor 2 is analog information, and an A/D converter 3 is provided to convert the information into digital data.

The outputs from both sensors 1.2 are input to a microcomputer 4. The microcomputer 4 has (PU, ROM for data, AM, 'b/q, timer counter, etc.). It has an arithmetic circuit 6 (an example of an address arithmetic means), an example of a cheap lookup lookup means), and a control circuit 8 (an example of a control means).The timer 5 receives a pulse signal from the rotation sensor 1. Receives the famous signal between IT & lfl
31 measurement by counting the number of clock pulses from the light source [, 2, I11]
f! There are two and one is. The address arithmetic circuit 6 calculates an address 11'f (for example, from 000 to FFF's 1
6 i4i: A numerical value). The table lookup circuit 7 includes the address calculation circuit 6
5' in memory based on address IiI'1 from
7) Input '+nio at address N1. Iodine injection It bt value λ and '3, read the ignition timing value and output it I9 r+1 is 1-.For example, in R Ohi (rl.2 extrusion 1.'/.I11 memory) , as shown in FIG.
At address 'Ii', there is a large j'1 injection 44 igi 1,
2000 ~ 2 F F)'Memorize your friend's value at the address-)t:i? (0 out of each number Ill in this ξ
The value of the 00-rule '1i' corresponds to the address value calculated by the address calculation circuit 6.

ing. Circuit 7, which has input the address value from circuit 6, calculates two values by adding 1000 and 2000 to the address value, and calculates . R
1000-1 in OM. While reading the fuel injection amount value in the FFF threatening area, 2000 is calculated by the value of 2000 Kayo.
Read the ignition timing value within address ~2FFF.

The read fuel injection amount value and ignition timing value are sent to the control circuit 8.
Output to. The control circuit 8 includes a transistor 10 that controls opening and closing of the fuel injection valve 9 and a transistor 12 that operates the ignition coil 11 based on the fuel injection amount value and ignition timing value from the Dave/l' lookup circuit 7.
13 is an ignition bladder.

Next, the operation is shown using a flowchart as shown in FIG. First, turn the ignition switch (not shown) to
When direct battery voltage is applied to the electronic engine control device by N, the voltage is constant! A forward voltage generation circuit (not shown) supplies the 'iE source voltage to each circuit element including the 21st I microcomputer 4.

Next, the internal state of the microcomputer 4 is initialized, and the program starts from P□ in FIG.

When the nut switch is turned on at P2 and the shaft starts rotating, the clock parnu count number T is set at P3.
is set to 0, and the reference position Ll fn S is output from the rotation sensor 1 every time the crankshaft rotates 180° at P4.
wait for input. When the 1h number S is input, counting of the count number T is started at P5, and this calculation is continued until the next reference position (signal S interrupts) at Pb.

When the signal S turns ON at P6, the rotation speed N is calculated at P7, and the throttle opening value A from the throttle sensor 2 is calculated at P.
is input. At P, one address value Act is determined from the rotational speed N and the throttle opening A.

Address value A (assuming that 1 is 21, for example, Pl.

Then add 1000 and 2000 to 21 to get 1021 and 2.
Create two numbers A (1□, Ad2) of 021, and read out the fuel injection amount value F from address 1021 in the memory shown in Fig. 3 based on both numbers A (1,, Ad2). , reads the ignition timing value ■ from address 2021.

The read nine values F and ■ are outputted to the control circuit 8 at P□2, and then the count number T is set to 0 at P□3.
Return to P5 again.

Here, for example, the reference position signal S has a crank angle of 180@
This corresponds to the top dead center of two types of cylinders that are shifted, and among the above programs, P5 to "13" are executed once every time the crankshaft rotates 180 degrees.

Control circuit 8 into which the fuel injection amount value F and ignition timing value are input
Now, transistors 10 and 12 are connected according to a conventionally known procedure.
to obtain the optimum fuel injection amount and ignition timing using the rotation speed and thrower)/77 times as parameters. If the ignition timing value is set, for example, when the spark plug 13 is activated, the energization start time is calculated by subtracting the energization time determined by the unique characteristics of the ignition coil 11 from the ignition timing value. be done. If the ignition timing value is set as the energization start time, by adding the above energization time to the ignition timing value, the circuit of the primary coil of the ignition coil 11 is interrupted and the secondary coil is The time at which the back electromotive force is generated, that is, the ignition time is calculated.

(Effects of the Invention) (1) Mainly according to configurations (a) and (b) of the above invention, an electronic engine control device with no response delay is obtained in which the engine control parameters are engine speed and throttle opening. be able to.

(2) Mainly due to the configuration of the above invention ((3) and (d), the fuel injection amount value and the ignition timing value can be obtained by calculating the address value once, so the calculation process is short and the program execution It is possible to improve speed and responsiveness.

(3) Since devices for each puff meter can be made common, manufacturing costs are reduced.

(Another embodiment) (1) Engine temperature, intake pressure, etc. may be added as an auxiliary puff meter. It can also be used in engines with superchargers.

(2) The jlu quasi-position signal S is not limited to being detected every 180 degrees, but may be detected every 360 degrees, for example.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of the present invention, FIG. 2 is a block diagram of an electronic engine control device according to the present invention, FIG. 3 is a partial diagram of a ROM memory map, and FIG. 4 is a flow chart. 1... Rotation sensor (an example of engine rotation speed detection means)
, 2... Thrower)/Resensor (an example of throttle opening detection means), 6... Address calculation circuit (an example of address calculation means), 7... Tape fiy) 7 Pick-up circuit (tape lv/I/ An example of a pick-up method), 9.
... Injection valve, 10... Transistor (an example of an injection valve control means), 11... Ignition coil/l/ (part of an ignition device), 12... Transistor (an example of an ignition timing control means), Ad...address value, F...
・Fuel injection amount value, ■...Ignition timing value Patent applicant: Kawasaki Heavy Industries, Ltd.
(Figure 1, Figure 2, Figure 4)

Claims (1)

[Claims] Engine speed detection means and slot! an opening detection means, an address calculation means for calculating one address value based on the information from the rain detection means, and a table lookup method for calculating the fuel injection amount value and the ignition timing value using the one address value. an injector control means for controlling the fuel injection amount of the injector using the fuel injection amount value; An electronic engine control bag f characterized in that it has an ignition timing control means for controlling
t.