KR100218775B1 - Control system of ignition timing according to ratation speed of engine and method thereof - Google Patents

Abstract

Crank angle detection means for detecting rotation of the crankshaft according to the engine output and outputting an electrical signal corresponding thereto; Battery voltage sensing means for detecting the voltage of the battery currently mounted on the vehicle and outputs an electrical signal corresponding thereto; When the crank angle signal output from the crank angle detection means is input, it is determined with the set calculation time point, and when the crank angle signal and the calculation time point are the same, the engine speed according to the input crank angle signal is obtained, and the energization time according to the battery voltage and An ignition control means for calculating an ignition timing, calculating and setting a calculation time point for the next stroke, and then outputting an ignition signal according to the energization timing; The ignition timing control device according to the engine speed comprising an ignition means for generating an ignition flame in accordance with the ignition signal output from the ignition control means, according to the current engine speed by varying the ignition control timing and the appropriate energization timing and ignition timing By performing the step of calculating the power before the energization period, it is possible to improve the engine output by applying the optimum ignition control according to the engine state of the current state, and to provide the control method.

Description

Ignition timing control device according to engine speed and its method

1 is an operation timing diagram of a conventional ignition timing control device,

2 is a block diagram of the ignition timing control apparatus according to the engine speed according to the embodiment of the present invention,

3 is an operation flowchart of the ignition timing control apparatus according to the engine speed according to the embodiment of the present invention.

The present invention relates to an ignition timing control device and a method thereof according to the engine speed. More specifically, the engine speed for varying the timing of calculating the energization time according to the driving state of the vehicle so that the optimum ignition timing can be applied. The present invention relates to an ignition timing control device and a method thereof.

In general, the ignition device refers to a device for igniting and combusting a compressed mixer in a combustion chamber at an appropriate time with an electric flame. Ignition timing is very important as a visual point of the combustion process.

In general, a good ignition timing is the optimal ignition timing, which sets the ignition timing so that the flame proceeds halfway through the combustion chamber when the piston is at top dead center (TDC). It occurs at 15 ° to 20 °.

If the ignition timing is fast, the ignition delay is prolonged due to insufficient pressure of the mixer. On the contrary, if the ignition timing is late, the spread of the mixer decreases, so that the flame propagation speed is slow and the combustion is slow in the explosion stroke. Since the trailing edge increases and the exhaust temperature rises, it is very important to determine the most appropriate ignition timing because the ignition timing is slow or even worse.

Conventionally, as shown in FIG. 1, when the crank angle signal corresponding to the top top dead center (BTDC) 114 ° of the cylinder is input by determining a signal for detecting the angle of the crank pulley according to the engine output. The energization time and ignition timing of the ignition coil are calculated.

However, as shown in the attached first, when a signal corresponding to BTDC 114 ° is input at a low speed with low engine speed, the energization time and ignition time are calculated, and then the ignition plug is energized. In the case of the high speed, the energization time is relatively long, and the energization time becomes worse than the calculation time.

In other words, when the engine speed is high, the rotation speed is high, so the energization time is relatively longer than at the low speed. Therefore, the energization time is faster than the calculation time, and the energization time and ignition time set at the current calculation time are the next ignition control. That is, it is used for the stroke after crank angle 180 degrees.

In the conventional case as described above, the information according to the various engine conditions necessary for the energization timing and the ignition timing calculation is not applied to the current state, but is applied to the state after the crank angle of 180 °, thereby realizing the ignition control corresponding to the optimum engine state. Difficult disadvantages arise.

Therefore, an object of the present invention is to solve the above disadvantages of the prior art, and the step of calculating the appropriate energization timing and ignition timing by varying the calculation timing of the ignition control timing according to the current engine speed is always immediately before the energization timing. The present invention is to provide an ignition timing control apparatus and a method for ignition timing according to the engine speed that can improve the engine output by applying the ignition control that is optimal according to the current engine status.

The configuration of the present invention for achieving the above object comprises: crank angle detection means for detecting the rotation of the crankshaft according to the engine output and outputs an electrical signal corresponding thereto; Battery voltage sensing means for detecting the voltage of the battery currently mounted on the vehicle and outputs an electrical signal corresponding thereto; When the crank angle signal output from the crank angle detection means is input, it is determined with the set calculation time point, and when the crank angle signal and the calculation time point are the same, the engine speed according to the input crank angle signal is obtained, and the energization time according to the battery voltage and An ignition control means for calculating an ignition timing, calculating and setting a calculation time point for the next stroke, and then outputting an ignition signal according to the energization timing; Ignition means for generating an ignition flame in accordance with the ignition signal output from the ignition control means.

Another aspect of the present invention for achieving the above object, the vehicle is started when the power is applied to initialize all the operating circuit and the use parameters; Sensing the output crank angle signal and comparing the crank angle signal with a set calculation time point; Calculating the engine speed according to the input crank angle signal when the measured crank angle signal is the same as the calculation point, and setting an energization timing and an ignition timing according to the engine speed and the battery voltage; Then calculating and newly setting a calculation time point for the next stroke according to the energized time measured above; And energizing the ignition means when the crank angle signal corresponds to the energization timing set above.

When described with reference to the accompanying drawings the most preferred embodiment which can easily implement this invention by the above configuration as follows.

2 is a block diagram of the ignition timing control apparatus according to the engine speed according to the embodiment of the present invention, and FIG. 3 is an operation flowchart of the ignition timing control apparatus according to the engine speed according to the embodiment of the present invention.

As shown in FIG. 2, the configuration of the ignition timing control apparatus according to the engine speed according to the embodiment of the present invention includes a crank angle detector 10 for detecting a crank angle according to engine output, and a battery voltage of a vehicle. Battery voltage detecting unit 20 for detecting the ignition, the ignition control unit 30 is connected to the output terminals of the detection unit (10, 20), and the ignition coil 40 is energized in accordance with the signal output from the ignition control unit (30) And an ignition plug 50 connected to an output end of the ignition coil 40.

The operation of the ignition timing control device according to the engine speed according to the embodiment of the present invention by the above configuration is as follows.

When the car is started and the power is applied, it initializes all the operating circuits and setting variables and detects the crank angle output according to the engine driving (S110 to S120).

The crank angle detector 10 is mounted on a crank pulley (not shown) to detect the rotation angle of the crankshaft that rotates according to the engine output and outputs an electrical signal corresponding thereto to the ignition controller 30.

The ignition controller 30 receives a crank angle signal output from the crank angle detector 10 and increases the signal value by +1, and stores the crank angle signal in an angle variable (Tooth) for counting the signal (S130). .

The initial value of the variable for counting the crank angle signal according to the embodiment of the present invention is 0, and the initial value of the calculation variable CAL_TIM for measuring the processing time for calculating the energization timing and ignition timing according to the present invention is also set to 0. do.

After measuring the crank angle signal currently output in the above, the ignition control unit 30 compares the set calculated variable value and each measured variable to determine whether it is time to calculate the energization time and the ignition timing of the ignition coil 40 (S140).

When each variable value measured above is equal to the set calculated variable value, the vehicle performs a routine for setting the energization and ignition timing.

In the embodiment of the present invention, since the initial value of the set calculated variable value is also set to 1, and the initial crank angle signal is 0 ° and the angular variable value is equal to 1, the ignition control unit 30 The voltage of the battery is checked in order to calculate the proper energization timing and ignition timing according to step S150.

The battery voltage detector 20 measures the voltage of the battery mounted on the vehicle and outputs an electrical signal corresponding thereto to the ignition controller 30.

The ignition control unit 30 takes the input crank angle signal as the ignition timing control reference point, converts the engine speed according to the crank angle signal, and then ignition control unit (not shown) according to the measured battery voltage and the obtained engine speed. According to the ignition timing table stored in the memory 30, the optimal energization timing and ignition timing are calculated (S160).

The crank angle signal corresponding to the ignition timing reference point according to the embodiment of the present invention is a value corresponding to BTDC 114 ° as 0 °, and in general, to form a magnetic field in the magnetic field of the ignition coil 40 when the battery voltage is low. The energization time should be long, and if the battery voltage is relatively high, the energization time will be short.

In the above, the ignition control unit 30 obtains the engine speed according to the measured crank angle signal, determines the engine load, measures the battery voltage, calculates the optimum energization timing and ignition timing according to the vehicle and the driving state, and then The time point for calculating the energization time and ignition time of the city is obtained.

According to an embodiment of the present invention, a method for obtaining a time point for calculating the energization timing and the ignition timing is as follows.

In the formula (1), the energization time is the energization time calculated in the step (S160), Tooth period is the polling of the next signal at the falling edge of the crank angle signal output from the crank angle detector 10 Corresponding to each signal in the period to the edge, the execution time is the processing time of the program for calculating the energization time and the ignition time according to the input crank angle signal, the constant 1 is CAL_TIM is Tooth unit, that is, Since the execution time / Tooth cycle operation is performed to be calculated in units, it is a margin value that compensates for the fractional part of the result, and the INT () function takes only the integer part of the result [INT + (3.5) = 3].

Therefore, the right value of the formula (1), that is, the INT (run time / TOOTH period) value is converted into each signal value. In addition, the energization period is also an angle signal value corresponding to the input crank angle.

The ignition timing reference point at which the angle value obtained by subtracting the crank angle corresponding to the time for calculating the energization timing and the ignition timing according to the crank angle signal input at the energization timing set according to the current engine state in Equation (1) is input. According to the calculation, it is time to calculate the energization time and ignition time.

The energization time calculated in Equation (1) also varies according to the engine speed determined according to the crank value, and the tooth period also varies according to the engine speed (the slower the engine speed, the longer the period of the crank angle signal output). The slower the engine speed, the faster the crank angle signal cycle.)

The calculation point (CAL_TIM) also varies depending on the engine speed.

Therefore, the optimum energization timing and ignition timing can be calculated according to the current engine state before the energization time at all times regardless of the engine speed by the calculation time newly calculated during the next stroke.

After calculating the calculation time to be performed at the next stroke as described above, the ignition control unit 30 determines whether the current crank angle signal, that is, the value of each variable (tooth) is greater or less than the energization time (S180). The controller 30 energizes the ignition coil 40 when the current angular variable (tooth) value is larger than the above-mentioned energization time, or when the electricity supply time passes, or when the current is supplied to the primary coil (not shown). Apply.

Since the ignition control unit 30 energizes the ignition coil 40 and cuts off the current to the ignition coil 40 when the input crank angle signal corresponds to the ignition timing calculated above, 2 is not shown. High induction voltage is generated in the secondary coil, and sparks are generated in the spark plug 50.

In the above, the ignition controller 30 detects the crank angle output again when the current angular variable value is smaller than the energization time.

As described above, in the embodiment of the present invention, the step of calculating the appropriate energization timing and ignition timing by varying the ignition control timing in accordance with the current engine speed is performed before the energization period, so that It is possible to provide an ignition timing control device and method according to the engine speed having an effect of improving the engine power by applying the ignition control.

Claims (5)

Crank angle detection means for detecting rotation of the crankshaft according to the engine output and outputting an electrical signal corresponding thereto; Battery voltage sensing means for detecting the voltage of the battery currently mounted on the vehicle and outputs an electrical signal corresponding thereto; When the crank angle signal output from the crank angle detection means is input, it is determined with the set calculation time point, and when the crank angle signal and the calculation time point are the same, the engine speed according to the input crank angle signal is obtained, and the energization time according to the battery voltage and Ignition control means for calculating an ignition timing, calculating and setting a calculation time point for the next stroke, and then outputting an ignition signal in accordance with the energization timing; Ignition timing control device according to the engine speed, characterized in that consisting of ignition means for generating an ignition flame in accordance with the ignition signal output from the ignition control means. According to claim 1, wherein the point and the control means is an angle obtained by subtracting an angle corresponding to the time to calculate the energization time from the energization time and the ignition timing calculation time according to the input crank angle signal Ignition timing control device according to the engine speed, characterized in that set to a value. Power On Time: Set power on time according to engine speed and battery voltage. Tooth period: The period from the falling edge of the crank angle signal to the next falling edge. Execution time: The processing time of the program that calculates the energization time and ignition time according to the input crank angle signal. Constant 1: Execution time / Tooth The margin to compensate the fractional part of the result. INT (): A function that takes only the integer part of the result. The method according to claim 1, wherein the ignition control means outputs an ignition signal to the ignition means even when the input crank angle signal is larger than the set energization period, that is, when the energization period has passed. Ignition timing control. Initializing all operation circuits and usage parameters when the vehicle is started and powered; Sensing the output crank angle signal and comparing the crank angle signal with a set calculation time point; Calculating the engine speed according to the input crank angle signal when the measured crank angle signal is the same as the calculation point, and setting an energization timing and an ignition timing according to the engine speed and the battery voltage; Then calculating and newly setting a calculation time point for the next stroke according to the energized time measured above; And energizing the ignition means when the crank angle signal corresponds to the energization timing set above. The method according to claim 4, wherein in the step of calculating the above-mentioned calculation time point, the energization time and ignition timing calculation time point corresponding to the input crank angle signal correspond to the time corresponding to the time for calculating the energization time at the power supply time set as follows. Ignition timing control method according to the engine speed, characterized in that the set to the angle value minus the angle. Power on time: Power time set according to engine speed and battery voltage Tooth period: Period from the falling edge of the crank angle signal to the next falling edge. Execution time: Processing time of program that calculates energization time and ignition time according to input crank angle signal Constant 1: Execution time / Tooth The margin to compensate the fractional part of the result. INT (): A function that takes only the integer part of the result.