JPH0713506B2 - Engine ignition timing control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine ignition timing control device for controlling ignition timing during engine acceleration, and more specifically, to prevent knocking and pre-ignition. The present invention relates to an ignition time control device that controls the ignition timing at the time of acceleration.

2. Description of the Related Art In an electronically controlled engine, a basic ignition timing is experimentally obtained in advance according to an engine speed and an engine load so that a maximum pressure is generated at a top dead center in an electronically controlled engine. In general, it is stored in the form of a map and is controlled according to this basic ignition timing.

However, during acceleration, the occurrence of pre-ignition and knocking was recognized only by controlling according to the thus-determined basic ignition timing, and the desired result was not obtained.

Therefore, during acceleration, the ignition timing is further retarded from the basic ignition timing by a predetermined amount according to the acceleration signal,
Methods have been proposed to prevent pre-ignition and knocking. (JP-A-58-96173) Problems to be Solved by the Invention However, the value of the basic ignition timing at the time of starting acceleration is different between the case of accelerating from a steady operation state and the case of accelerating immediately after deceleration. Therefore, even if the acceleration signals are the same, if the retard amount is made the same and the ignition is performed, the ignition timing is advanced from the optimum ignition timing in the acceleration immediately after deceleration. It was recognized that there was a problem that pre-ignition and knocking could not be prevented. That is, immediately after deceleration, the amount of intake air passing through the air flow meter is sharply reduced, so the basic ignition timing is set so as to be largely on the advance side as compared with the steady operation state. However, if the ignition timing is retarded by the same amount even if they are the same, the ignition timing when accelerating immediately after deceleration despite the same acceleration state is The ignition timing is inevitably advanced as compared with the optimum ignition timing, and as a result, the occurrence of pre-ignition and knocking cannot be avoided.

An object of the present invention is to ignite an engine capable of increasing the output and preventing the occurrence of pre-ignition or knocking regardless of whether the acceleration is from a steady operation state or immediately after deceleration. It is an object to provide a timing control device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a basic ignition timing calculation means for calculating a basic ignition timing based on an engine speed and an intake air amount of the engine, and an acceleration / deceleration detection means for detecting an acceleration / deceleration state of the engine. The acceleration / deceleration detection signal input from the acceleration / deceleration detection means is stored, and when the acceleration state is determined based on the acceleration / deceleration detection signal, a comparison means for generating a retard signal and the basic ignition timing calculation means Based on the input basic ignition timing and the retard signal input from the comparison means, an ignition timing calculation means for calculating an optimum ignition timing is provided, and the ignition timing calculation means,
When the retard signal is input from the comparison means, the retard amount of the basic ignition timing is calculated, the basic ignition timing input from the basic ignition timing calculation means is corrected, and the optimal ignition timing is calculated. In the engine ignition timing control device configured as described above, when the comparison unit determines that the operating state before the acceleration state transition is the deceleration state based on the acceleration / deceleration detection signal input from the acceleration / deceleration detection unit, , Outputting a retard amount correction signal to the ignition timing calculation means, and when the ignition timing calculation means receives the retard amount correction signal from the comparison means, corrects the retard amount of the basic ignition timing to be large. And an ignition timing control device for an engine, which is configured to calculate an optimum ignition timing.

According to the present invention, the comparing means generates a retard signal when the acceleration state is determined based on the acceleration / deceleration detection signal, outputs the retard signal to the ignition timing calculation means, and outputs the acceleration / deceleration input from the acceleration / deceleration detection means. Based on the detection signal, when it is determined that the operating state before the acceleration state transition was the deceleration state, the retard amount correction signal is output to the ignition timing calculation means, and the ignition timing calculation means is based on the retard signal from the comparison means. While calculating the optimum ignition timing, when the retard amount correction signal is received from the comparing means, the retard amount of the basic ignition timing is corrected to be large, and the optimum ignition timing is calculated. When the vehicle is in the deceleration state and the ignition timing is advanced compared to the steady state or the accelerated state, when the acceleration is accelerated, the steady state is changed to the accelerated state for the same acceleration signal. The ignition timing is set to the same optimum ignition timing as when the vehicle is accelerating and the accelerating state is continuing.Therefore, the ignition timing is advanced as compared with the steady state and the accelerating state in the decelerating state. Because it was horny,
Even if the ignition timing is retarded, it is possible to reliably prevent the occurrence of pre-ignition and knocking due to ignition being performed at an ignition timing advanced from the optimal ignition timing.

Example Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an overall schematic view of an engine including an engine ignition timing control device according to an embodiment of the present invention, and FIG. 2 is an electronic control device including an engine ignition timing control device according to an embodiment of the present invention. A block diagram, FIG. 3, is a flow sheet showing control of ignition timing in the electronic control unit.

In FIG. 1, an engine 1 includes a cylinder bore 2 and a piston 3 fitted and inserted therein, and a combustion chamber 4 is formed in an upper space of the piston 3 in the cylinder bore 2.
The intake air is sucked into the intake passage 6 through the air cleaner 5, the flow rate of the intake air is controlled by the throttle valve 7, and the intake air is sent to the intake valve 8. When the intake valve 8 is opened at a predetermined timing, the inside of the combustion chamber 4 is closed. Will be introduced to. The exhaust gas is exhausted through the exhaust passage 10 by opening the exhaust valve 9. Fuel is injected into the intake passage 6 at a predetermined timing from a fuel injection valve 11 which is provided upstream of the intake valve 8 so as to be able to inject fuel. Reference numeral 12 is a spark plug that ignites the air-fuel mixture in the combustion chamber 4 at a predetermined timing. Reference numeral 13 denotes an electronic control device, which is an air flow meter 14
From the throttle opening sensor 15, a throttle opening detection signal from the throttle opening sensor 15, an engine speed detection signal from a crank angle sensor (not shown), and a 0 ₂ sensor.
Air-fuel ratio detection signals are input from 16 respectively, necessary calculations are executed based on these input signals, necessary control signals are calculated, and output to each means. FIG. 1 shows only an example in which control signals for the fuel injection timing and the ignition timing are output to the fuel injection valve 11 and the spark plug 12, respectively.

Further, referring to FIG. 2 and FIG. 3, the ignition timing control in the embodiment of the ignition timing control device of the present invention will be further described. First, the intake air amount detection signal detected by the air flow meter 14 and An engine speed detection signal detected by a crank angle sensor (not shown) is input to the basic fuel injection means of the electronic control unit 13, and the basic fuel injection time is calculated and calculated based on this input signal.

Then, the basic fuel injection time and the engine speed detection signal thus calculated are input to the basic ignition timing calculation means,
Based on this input signal, the basic ignition timing is calculated and calculated according to the data which is experimentally obtained in advance and stored in the basic ignition timing calculating means in the form of a map or the like. The basic ignition timing calculated in this way is output to the ignition timing calculation means for calculating the optimum ignition timing together with the engine speed detection signal.

Independently of these, the throttle opening detection signal detected by the throttle opening sensor 15 is input to the acceleration / deceleration state detection means, using the previous input signal stored in the acceleration / deceleration state detection means, The rate of change of the throttle opening is calculated, and it is determined whether the state is the acceleration state, the deceleration state, or the steady state. This acceleration / deceleration determination signal is input to the comparison means.

When the acceleration / deceleration determination signal indicates a deceleration state or a steady state, the comparison means stores that fact and outputs a correction zero signal to the ignition timing calculation means for calculating the optimum ignition timing. Even if the acceleration / deceleration determination signal indicates an acceleration state, but if it indicates a state less than the predetermined acceleration value, it is not necessary to perform retard correction on the basic ignition timing. , And outputs a correction zero signal to the ignition timing calculation means. On the other hand, when the acceleration / deceleration determination signal indicates an acceleration state of a predetermined value or more, the fact is stored, the acceleration detection value signal is output to the ignition timing calculation means, and further, the previous value stored in the comparison means is stored. The acceleration / deceleration determination signal is read.
If the previous acceleration / deceleration determination signal indicates a steady state or an acceleration state, normal retard correction may be applied to the basic ignition timing.Therefore, if the retard signal indicates a deceleration state, the basic ignition timing The retard amount correction signal for correcting the retard amount to correct the
Each is output to the ignition timing calculation means.

In the ignition timing calculation means, the retard amount for correcting the basic ignition timing which is the output of the basic ignition timing calculation means is calculated and calculated according to the acceleration detection value signal from the comparison means, and the input signal from the comparison means is changed to the retard value. When the signal is a signal, the retard amount thus calculated corrects the basic ignition timing to calculate the optimum ignition timing. On the other hand, when the input signal from the comparison means is a correction zero signal,
With the basic ignition timing as it is, the optimal ignition timing control signal is output to an ignition coil (not shown), the ignition coil is energized at the ignition timing, and the ignition plug 12 ignites the air-fuel mixture in the combustion chamber 4. On the other hand, when the retard amount correction signal is input from the comparison means, the retard amount calculated as described above is corrected to be larger based on the engine speed detection signal, and the optimum ignition timing is obtained. The optimum ignition timing control signal is output to the ignition coil, the ignition coil is energized at the ignition timing, and the ignition plug is
12 ignites the mixture in the combustion chamber 4. here,
The correction of the retard amount based on the engine speed detection signal is
Since the ignition timing during deceleration is advanced as the engine speed detection signal is larger, the retard amount correction value is increased.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and those modifications are also included in the scope of the present invention. Needless to say.

For example, in the above-described embodiment, the acceleration / deceleration determination is performed based on the throttle opening change signal calculated based on the throttle opening detection signal detected by the throttle opening sensor 15. The acceleration / deceleration may be determined based on the calculated intake air amount change rate based on the detected intake air amount detection signal.

In the above embodiment, when the acceleration / deceleration determination signal is the deceleration state, the steady state, and the acceleration state and the acceleration detection value is less than the predetermined value, the correction zero signal is output from the comparison means to the ignition timing calculation means. However, in such a case, no signal may be output from the comparison means to the ignition timing calculation means.

Furthermore, each means described in FIG. 2 of the above embodiment is merely a conceptual representation of each function of the ignition timing control in the embodiment in the form of means, and such means is not necessarily a physical It does not mean that they must be present as independent means independently, and two or more means described in FIG. 2 may be combined to form one physical means, or one means. The means may be divided into two or more physical means, or a part of the functions of one means may be assigned to another means. For example, the ignition timing calculation means in the above embodiment is a means for physically calculating the retard amount based on the acceleration detection value, a means for calculating the retard amount correction value, and a means for correcting the retard amount by the retard amount correction value. It may be divided into means for calculating the ignition timing and outputting the ignition timing control signal.

EFFECTS OF THE INVENTION According to the present invention, focusing on the fact that the ignition timing is advanced in the deceleration state compared to the steady state, the retard amount of the ignition timing due to acceleration is accelerated when accelerating from the deceleration state. As compared with the case of accelerating from the steady state, it is corrected so that it becomes larger, and the retard amount of the ignition timing due to the acceleration is corrected by the corrected retard amount. In this case, the retard amount of the ignition timing is small, and it is possible to obtain sufficient output without causing pre-ignition or knocking due to the ignition timing advancing too much with respect to the optimum ignition timing. Become.

[Brief description of drawings]

FIG. 1 is an overall schematic view of an engine including an engine ignition timing control device according to an embodiment of the present invention, and FIG. 2 is an electronic control device including an engine ignition timing control device according to an embodiment of the present invention. A block diagram, FIG. 3, is a flow sheet showing control of ignition timing in the electronic control unit. 1 ... Engine, 2 ... Cylinder bore, 3 ... Piston, 4 ... Combustion chamber, 5 ... Air cleaner, 6 ... Intake passage, 7 ... Throttle valve, 8 ... Intake valve, 9 ... Exhaust valve, 10 ...... exhaust passage, 11 ...... fuel injection valve, 12 ...... spark plug, 13 ...... electronic control unit, 14 ...... air flow sensor, 15 ...... throttle opening sensor, 16 ...... 0 ₂ sensor.

Claims (1)

[Claims] 1. A basic ignition timing calculating means for calculating a basic ignition timing based on an engine speed and an intake air amount of the engine, an acceleration detecting means for detecting an acceleration and a deceleration state of the engine, and an acceleration / deceleration detecting means. The input / output acceleration / deceleration detection signal is stored, and when the acceleration state is determined based on the acceleration / deceleration detection signal, a comparison unit that generates a retard signal and a basic ignition timing input from the basic ignition timing calculation unit And an ignition timing calculation means for calculating an optimum ignition timing based on the retard signal input from the comparison means, the ignition timing calculation means, when the retard signal is input from the comparison means, the basic ignition. The retard amount of the timing is calculated, the basic ignition timing input from the basic ignition timing calculating means is corrected, and the optimal ignition timing is calculated. In the engine ignition timing control device formed, the comparison means, based on the acceleration / deceleration detection signal input from the acceleration / deceleration detection means, when it is determined that the operating state before the acceleration / deceleration state transition is the deceleration state, A retard amount correction signal is output to the ignition timing calculation means, and when the ignition timing calculation means receives the retard amount correction signal from the comparison means, the retard amount is corrected so as to increase the retard amount of the basic ignition timing. And an ignition timing control device for an engine, which is configured to calculate an optimum ignition timing.