JPS608469A - Method of correctively controlling ignition timing advance in transient state of internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve transient responsive property by igniting in ignition timing for a predetermined time right after running is shifted from idling to non-idling when engine cooling water temperature is lower than a set value in such shift time. CONSTITUTION:Whether or not engine cooling water temperature is higher than a predetermined value is judged in step 130. If it is not, i.e. the engine is cooled, advance is made to step 140, and whether or not a predetermined time has elapsed after running is shifted from idling to non-idling, is judged. When that shift is carried out within that time in cooling the engine, ignition timing right after the shift is used in step 170. Thus, the transient responsive property is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large advance angle correction control method at a transient time, the purpose of which is to improve the transient response characteristics in a transient operating state of an internal combustion engine equipped with an electronic ignition advance device.

Hereinafter, the internal combustion engine will be abbreviated as engine.

Conventionally, an electronic ignition advance device has been used to achieve the optimum ignition timing for the purpose of improving engine fuel efficiency, etc., but the optimum ignition timing set by this device is a value for the steady operating state of the engine. be.

Therefore, for example, in a transient operating state of the engine, the engine operating conditions such as the air-fuel ratio are corrected based on the detected values of engine operating parameters such as rotational speed, intake pipe pressure, and cooling water temperature, and the transient response wait ('L It is inappropriate to use the ignition timing for the steady operating state of the engine as described above for an engine control system using electronic control units 1 to 1 whose purpose is to improve the performance of the engine. As an ignition timing control 211 device for suppressing the occurrence of knocking during engine acceleration, the ignition timing control corrects the ignition advance value during acceleration in combination with a knock sensor, a switch that responds to intake pipe pressure, etc. The device is
Japanese Patent Application No. 55-156261 (Patent Application No. 54-66011)
However, the structure is complicated,
There are practical problems in terms of cost and maintenance (reliability).

The present invention aims to solve the problem by using a simpler method.
This is to obtain a satisfactory ignition advance angle correction effect during transient operation of the engine.

Therefore, the present invention provides important transient response characteristics of the engine during acceleration from an idle operating state (for example,
In order to improve the transient response characteristics by shortening the response time (1J) during transient operating conditions of this engine, we focused on the ignition advance angle during a certain period of time immediately after the start of acceleration operation. By advancing the value from the ignition advance value originally given by the electronic ignition advance device,
An object of the present invention is to provide a method for increasing output torque during excessive engine operation.

The characteristics of the engine transient large advance angle correction control method according to the present invention are as follows.

(1) The idle operating state of the engine is determined for a certain period of time (a predetermined period of time or a predetermined number of ignitions) after the signal indicating the idle operating state (idle-on signal) no longer indicates the idle operating state (changes to the idle-off signal). The ignition advance value used in
The spark advance value taken immediately after the idle on-off change.

(2) The operating range of the engine in which the transient large advance angle correction control described in (1) above is performed is the range in which troublesome phenomena such as knocking do not occur even if this control is performed, that is, for example, the engine cooling water temperature This is an area where the temperature is lower than the water temperature set value, or an area where the occurrence of knock is not detected by a knock sensor attached to the engine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The procedure of the method of the present invention and the configuration of an apparatus for carrying out the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the overall configuration of an example of an apparatus used to carry out the present invention. In FIG. 1, reference numeral 1 indicates a spark ignition type engine body, 8 is a throttle valve that operates in conjunction with the accelerator, and the air that has passed through the accelerator 12 is transferred to the engine via the throttle valve 8 and the intake pipe 11. is inhaled. 7 is an electronic control unit (ECU) that controls the operation of the engine 1, receives detection output signals from various sensors that detect operating parameters of the engine 1, processes the signals, and controls the operation according to the operating state of the engine 1. Forms and outputs electrical signals that control conditions. 1
Reference numeral 0 designates the coils from the electronic control units 1 to 7, which receives control from the electronic control unit 7J, controls the intermittent flow of the current flowing through the primary coil, and generates a high voltage for ignition. 5 is a distributor, which not only distributes the high voltage for ignition sent from the ignition coil 4 to each cylinder of the engine 1, but also has a built-in rotation sensor 5a, which transmits rotation angle signals and reference signals. It generates an angular position signal and sends it to the electronic control unit 7.

2 is a pressure sensor that detects the intake pipe pressure P;
The detection output signal is sent to the electronic control unit 7 for use in controlling the energization of the ignition coil of the engine 1, the ignition timing, the air-fuel ratio, and the like. Reference numeral 3 denotes a throttle switch which is activated by the throttle valve 8, detects the fully open state of the throttle valve 8, that is, the idle operating state, and sends the detected output signal to the electronic control unit 7.

Reference numeral 6 denotes a water temperature sensor using a thermistor or the like for detecting the coolant temperature of the engine 1, and its detection output signal is sent to the electronic control unit 7. Note that 9 is an 02 sensor that generates a signal for feedback control of the air-fuel ratio, and its detection output signal is sent to the electronic control unit 7.

Next, the configuration of the electronic control unit (ECLI) shown in FIG. 1 will be explained with reference to FIG. 2. In FIG. 2, reference numeral 1oo controls the energization of the ignition coil 4 using detection output signals input from various sensors and various data and constants stored in the storage device of the electronic control unit 1-7. This is a microprocessor unit (CPU) that calculates ignition timing and fuel injection amount. Reference numeral 101 denotes a rotational speed counter, which inputs the rotational angle signal and reference angular position signal from the rotational sensor 1no 5a in the distributor 5, calculates the engine rotational speed N, and calculates the rotational speed N from the rotational speed sensor 2, throttle switch 3, and water temperature. The detection output signal from the sensor 6 is input, A-D conversion is performed on the necessary signals, and the digital signals are sent to the CPU without displaying their values.
Send to 100.

103 is a read/write storage device (RAM);
U100 is used for storing control data during control program execution. 104 is a read-only storage device (ROM>
and is used for storing control programs and ill control constants. 105 is used for arithmetic processing by the CPU 100.
This is an energization and ignition control unit that receives the control data signal calculated by the ignition coil 4 and outputs a signal for driving an igniter that is attached to the ignition coil 4 and controls its energization and ignition.

Reference numeral 106 denotes a power supply circuit for supplying the necessary power supply voltage to each part of the electronic control unit 7, and the power is supplied to the variable valve 14 via the power switch 13.

Next, the procedure of the method of the present invention will be explained with reference to the flowchart of the ignition advance control procedure shown in FIG.

In the electronic ignition advance control performed by the above-mentioned electronic control unit 7, the rotation angle signal and reference angle position signal which are the detection signals of the rotation sensor 5a and the intake pipe pressure which is the detection output signal of the pressure sensor 2 are used. Based on the signal, the CPU 1 controls the energization of the ignition coil 4 and the ignition timing.
However, in the method of the present invention, the calculation processing procedure includes a transient ignition advance correction control operation for improving the transient response characteristics particularly in transient operating conditions. The operation of the engine 1 depends on whether or not the engine 1 is in an idling operating state, the length of the elapsed period after the engine 1 shifts from an idling operating state to a non-idling operating state, and the high or low temperature of the cooling water of the engine 1. Alternatively, the selection is changed according to the determination result of whether or not 10 engine knocks occur.

The steps of the ignition advance processing shown in the flowchart of FIG. 3 are included in the main routine of the control program stored in the ROM 104 of FIG. After the power switch 13 in FIG. 2 is turned on, the process is repeated at regular intervals.

When the transient ignition advance correction control operation is started in the control main routine shown in FIG.
At this time, it is determined whether or not the current operating state of the engine 1 is an idle state based on the detection output signal of the thrower switch 3. That is, if the engine 1 is in an idle operating state, an idle-on signal is read, and if the engine 1 is no longer in an idle operating state, an idle-off signal is read. The result of the determination in step 110 is
When it is on, the process proceeds to step 150, and normal ignition advance angle calculation for idling operation is performed using only the engine rotational speed N as data. If the result of the determination in step 110 is idle off, step 120 is performed.
The process proceeds to steps 170 to 170.

In step 120, it is determined whether the current ignition is a direct ignition in which the detection output signal of the throttle switch 3 changes from an idle-on signal to an idle-off signal. If the ignition occurs immediately after changing from idle on to idle off, the process proceeds to step 170, where the ignition advance value immediately after idle on-off is calculated and used. The result of the determination in step 120 indicates that the idle
If the ignition is not immediately after changing from on to idle/off, the process proceeds to step 130. In step 130, it is determined whether the engine cooling water temperature is equal to or higher than the water temperature set value (y°C), and if it is equal to or higher than y°C, the process proceeds to step 160. In step 160, the engine rotation speed N
Using the detected value of the intake pipe pressure P as data, the engine rotation speed UN is stored in the ROM 104 in FIG.
The corresponding ignition advance value is determined from a map of ignition advance values that cover the parameters and intake pipe pressure P.

As a result of the determination in step 130, if the engine cooling water temperature is lower than y° C., the process proceeds to step 140. In step 140, it is determined whether a predetermined period (bold setting period) has elapsed after the detection output signal of the throttle switch 3 changed from idle on to idle off. As a result of the determination in step 140, if the hold setting period has elapsed, the process proceeds to step 180, where the ignition advance value is determined from the map in the ROM 104 as described above.
How to use, if the hold setting period has not elapsed, step 17
0 and use the arithmetic value of the ignition advance value immediately after idle on-off as described above.

As mentioned above, when the engine 1 transitions from an idling state to a non-idling state (for example, a racing state), after a predetermined period of time has elapsed, the engine 1 changes immediately after the throttle switch 3 is turned from on to off. Use the ignition advance value. Therefore, in the above example, an effective output of 1 to 1 kW of the engine 1 can be obtained immediately after the start of racing, thereby making it possible to improve the transient response characteristics.

The method of the present invention is an engine control device using an electronic control unit, which corrects engine operating conditions based on detected values of operating parameters (for example, intake pipe pressure) during transient operating conditions of the engine, thereby increasing engine speed. It is extremely effective when applied to devices designed to obtain sharp response characteristics.

In the above embodiment, the ignition advance correction control according to the present invention is performed only when the engine cooling water temperature is lower than the water temperature set value in step 130 of the flowchart of FIG. Since the purpose is to prevent the occurrence of knocking, for engines equipped with a knock sensor for detecting the occurrence of knock in the main body of the engine 1, the determination in step 130 is made based on the output signal of the knock sensor directly. The presence or absence of knocking may also be determined.

As described above, according to the present invention, in the engine operation control u11 using the electronic control unit, as the ignition advance value in the transient state in which the engine operation state shifts from the idle operation state to the non-idle operation state, Depending on the length of the elapsed period after the transition of the engine operating state, as well as the high/low temperature of the engine cooling water, or the determination result of whether or not knocking has occurred,] As with the use of advance angle values, it is possible to improve the transient response characteristics of the engine in transient operating conditions by operating a device with a simple configuration different from the prior art, and therefore with less cost and higher reliability. That's the 1st effect! J is done.

[Brief explanation of the drawing]

FIG. 1 shows a configuration when the method of the present invention is applied to an internal combustion engine equipped with an engine control device using an electronic control unit 1 [this is a schematic configuration diagram]. FIG. 2 is a schematic diagram showing the configuration of the electronic control unit (ECU) in FIG. 1 and its input/output connections with external elements. FIG. 3 is a flowchart showing the calculation processing procedure of the control method according to one embodiment of the present invention. (Explanation of symbols) 1... Internal combustion engine, 2... Pressure sensor, 3... Throttle switch, 4... Ignition coil with igniter, 5... Distributor, 5a... Rotation sensor, 6. ...Water temperature sensor, 7...Electronic control unit (ECU), 8...Throttle valve, 9...02 sensor, 10...Injector, 11...Intake pipe, 12...Air cleaner, 100 ...Microprocessor Units 1~ (CPU
), 101... Rotation number counter, 102-2.6 car, 103... Read/write memory (RAM), 104
. . . Read-only storage device (ROM), 105 . . . Energization ignition control unit. Agent Akira Asamura

Claims (1)

[Claims] (1) For detecting operating parameters of an internal combustion engine, using an ignition advance value determined by calculation based on the detected operating parameters, and accelerating the internal combustion engine in an idle operating state. A transient large advance angle correction control method for an internal combustion engine, which performs transient large advance angle correction control in a transient operating state in which the operation is performed, wherein the calculation is performed on the ignition immediately after the start of acceleration operation from the idle operating state of the internal combustion engine. determining whether or not an advance angle value is to be calculated; calculating and storing an ignition advance value immediately after the start of the acceleration operation from the idling operation state; and after starting the acceleration operation from the idling operation state. determining whether a set period has elapsed; until the set period has elapsed;
The ignition advance value immediately after the start of the acceleration operation vn from the idling operating state is used, and after the set period has elapsed, the ignition advance value is determined by normal calculation processing after the acceleration operation from the idling operating state. A transient large advance angle correction control method for an internal combustion engine, the method comprising using an ignition advance value. (2. In the method set forth in claim 1, if it is determined that the calculation is not a calculation of the ignition advance value immediately after the start of acceleration of the internal combustion engine from the idle operating state, then: The method includes determining whether or not the detected operating parameter satisfies a predetermined condition, and when the predetermined condition is met, the detected value is determined by normal calculation after the acceleration operation from the idle operating state. The ignition advance value is used, and only when the predetermined condition is not met, it is subsequently determined whether a set period has elapsed after the start of the acceleration operation from the idling state. (3) The method according to claim 2, comprising:
The predetermined condition includes that the detected value of the cooling water temperature of the internal combustion engine is equal to or higher than the water temperature set value. (4) The method according to claim 2,
The predetermined condition includes that the occurrence of knock is not detected due to fogging of a knock sensor disposed in the internal combustion engine.