KR100273530B1 - Intrruptting system for top dead center tasking - Google Patents

Abstract

PURPOSE: An interrupt device for an upper dead center task is provided to precisely determine the position of a cylinder for carrying out the top dead center task precisely and speedily, thereby improving the reliability of an engine control unit and carrying out precise engine control operation according to a vehicle running state. CONSTITUTION: An interrupt device for an upper dead center task includes a crank position sensor(1) for outputting a pulse signal to be changed in period according to the rotation state of a crank shaft, a cam position sensor(2) for outputting a pulse signal to be changed in period according to the rotation state of a cam shaft, a timer(3) for counting the number of pulses input from the crank position sensor to generate an interrupt signal, and an engine control element(4) for comparing the pulse signals output from the crank position sensor and the cam position sensor together to determine a position of a cylinder according to the rotation state of the crank shaft, and carrying out a top dead center task processing according to the interrupt signal output from the timer element.

Description

Interrupt Device for Top Deadline Task

The present invention relates to an interrupt device for a top dead center (hereinafter referred to as a TDC) task, and more particularly, by using a pulse signal output from a crankshaft position sensor. The present invention relates to an interrupt device for a top dead center task for recognizing a BTDC (before top dead center) value and issuing an interrupt signal for top dead center task processing, thereby reducing signal throughput and processing time.

In order to enable the appropriate engine control operation according to the driving state of the vehicle, the engine controller always detects the driving state of the vehicle and controls the ignition timing, injection amount, or injection timing of the engine appropriately for each determined driving state. In order to output the optimum efficiency according to the driving state of the vehicle.

In order to detect the driving state of the vehicle that changes according to the driving conditions as described above, since a number of sensing devices are mounted at each corresponding position of the vehicle, the engine controller processes the signals input from various sensing apparatuses and changes according to the driving conditions. The driving state of the vehicle to determine the appropriate engine control operation can be made.

Among many sensors for determining the running state of the engine, there is a crank position sensor (CPS) for detecting the rotational position of the crankshaft.

The crankshaft position sensing device is mounted on a crankshaft, a distributor, or the like, and outputs a corresponding pulse signal according to the rotational state of the crankshaft rotating by the stroke of the piston of the engine making linear motion.

Therefore, the engine control device processes the pulse signal output from the crankshaft position sensing device to determine the operation state of each cylinder, and determines the position of the cylinder to be controlled. As a reference point for controlling the ignition timing or fuel injection operation of the engine. use.

In addition, the engine control apparatus calculates the engine speed by using the signal output from the crankshaft position detection device, and according to the degree of load of the engine that changes according to the driving state of the vehicle, the air-fuel ratio, ignition timing, engine idle speed Also used as information for controlling the back, the crankshaft position detection signal is very important information for controlling the operation of the engine.

At this time, when the position of the crankshaft is calculated, a camshaft position detection signal for detecting the position of the camshaft rotated once every two revolutions of the crankshaft is used to set a reference time point.

In general, for 4 cylinders, T = 30 / Ne.

T: 1 TDC cycle (sec) Ne: RPM (rpm)

30: Number of pulses of crankshaft position detection signal generated during 1 TDC period

Therefore, if Ne is 6.000 rpm, T = 5 ms according to the equation T = 30/6000, and the number of pulses of the crankshaft position detection signal occurring during one TDC period is 30, so the period between each pulse of the one crankshaft position detection signal is 5 ms / 30 = 166.66666. Becomes.

Therefore, the signal processing apparatus has to process a large amount of signals because the crankshaft position detection signal is input every about 167 Hz when the clock cycle of the preset control apparatus 100 MHz and the engine speed are 6.000 rpm.

As a result, an excessive signal processing amount may cause a data collision with other data during signal processing, resulting in an inability to execute accurate signal processing, resulting in a long signal processing time.

In particular, when the engine rotates at a high speed, the engine rotates at a high speed, and thus the period of the pulse signal output from the crankshaft position sensing device is shortened. Therefore, the time required to process each pulse signal is shortened. Conflicts between tasks occur more frequently.

Therefore, an object of the present invention is to solve the above-mentioned conventional problem, and recognizes the BTDC (brfore top dead center) value of each cylinder by using a pulse signal output from the crankshaft position sensing device, and accordingly the top dead center task The present invention provides an interrupt device for a top dead center task that generates an interrupt signal for processing so that top dead center task processing can be performed accurately.

1 is an output waveform diagram of a crankshaft position sensing device according to an embodiment of the present invention.

2 is an output waveform diagram of a camshaft position sensing device according to an embodiment of the present invention.

3 is a block diagram of an interrupt device for a top dead center task according to an embodiment of the present invention.

A configuration of the present invention for achieving the above object comprises: crankshaft position detecting means for changing the period of the output pulse signal in accordance with the rotational state of the crankshaft; Camshaft position detecting means for varying the period of the output pulse signal in accordance with the rotational state of the camshaft; Timer means for generating an interrupt signal by counting the number of pulses input from said crankshaft position sensing means; Comparing and determining the pulse signal output from the crankshaft position means and the pulse signal output from the cam axis position detection means to determine the position of the cylinder according to the rotation state of the crankshaft, TDC task according to the interrupt signal input from the timer means Engine control means for performing the processing.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an output waveform diagram of a crankshaft position sensing device according to an embodiment of the present invention,

2 is an output waveform diagram of a cam shaft position sensing apparatus according to an embodiment of the present invention, and FIG. 3 is a block diagram of an interrupt apparatus for top dead center task processing according to an embodiment of the present invention.

Looking at the configuration of the present invention with reference to Figure 3, the crankshaft position detection device (1) for changing the period of the output pulse signal according to the rotational state of the crankshaft; A camshaft position detecting device (2) in which a cycle of a pulse signal outputted according to the rotational state of the camshaft changes; A timer device (3) for issuing an interrupt signal by counting the number of pulses input from said crankshaft position sensing device (1); By comparing and determining the pulse signal output from the crankshaft position detection value 1 and the pulse signal output from the camshaft position detecting device 2, the position of the cylinder according to the rotation state of the crankshaft is determined, and the timer device 3 It is composed of an engine control device 4 for receiving the interrupt signal from the TDC task processing.

The timer device (3) comprises a first timer (31) for counting the number of pulses output from the crankshaft position detecting device (1) and generating an interrupt signal when the number of pulses reaches a certain number; When the first timer 31 generates an interrupt signal, the first timer 31 includes a second timer 32 that reloads the previously set value to the first timer 31 and resets it to a new setting value.

When the first timer 31 has a capacity of 8 bits and more data is input, an overflow occurs to generate an interrupt.

The timer device 3 may use a timer that is built in the engine control device 4 to operate programmatically, or may be used by attaching a separately designed timer to the outside.

Hereinafter, with reference to the accompanying drawings will be described the operation of the present invention.

First, a description will be given of a method of determining the reference cylinder using the pulse signal output from the camshaft position detecting device 2 and the pulse signal output from the camshaft position detecting device 1 by the engine controller 4. Let's do it.

When the operation is started, the engine controller 4 reads the signal output from the crankshaft position sensor 1 as shown in FIG. 1 to determine whether it is in a missing tooth state for determining a reference position.

When the read state of the crankshaft position detection signal is a missing teeth state, the engine controller 4 reads a signal output from the crankshaft position detection device 1 to determine whether a pulse is input.

However, if the read signal state of the crankshaft position detecting device 1 is not a missing teeth state, the engine control device 4 continues to determine the state of the crankshaft position detecting signal.

However, when the crankshaft position detection signal is input and the input signal state changes from the high level "H" state to the low level "L" state, the engine control device 4 inputs the cam shaft position detection device as shown in FIG. The output signal of (2) is read to determine the reference cylinder.

When the state of the read signal is " L " at low level, the engine controller 4 judges cylinder # 1 as the cylinder currently operating, and when the state of the determined signal is " H " at high level, the engine controller (4) determines cylinder number 4 as the currently operating cylinder.

In the embodiment of the present invention, cylinder 1, which has an output signal of the crankshaft position detecting device 1, is in a sewing machine state, and the signal output from the camshaft position detecting device 2 is in a low level "L" state as a reference cylinder. do.

When the reference cylinder is determined by the output signals of the crankshaft position detecting device 1 and the camshaft position detecting device 2 as described above, the camshaft position detecting device 2 outputs the camshaft position detecting device 2 as shown in FIG. The setting value of the first timer 31 of the timer device 3 of the state where the signal is low is in the " L " state is set to the nucleus value FFH, and the value of the second timer 32 is set to 256-30.

The first timer 31 is in an overflow state by a pulse signal input from the crankshaft position sensing device 1 for the first time after the values of the first and second timers are set, as shown in part 2 shown in FIG. To generate the interrupt signal INT to the engine control device 4.

At this time, the value 356-30 set in the second timer 32 is automatically reloaded into the first timer 31, and the value of the second timer 32 is reset to 256-28.

At the same time, the engine controller 4 recognizes that the BTDC value of the first cylinder is 114 ° by the interrupt signal INT input from the first timer 31 and performs a TDC task such as TDC period calculation and air volume calculation. .

Then, the section shown in FIG. 2 When 30 pulse signals are input from the crankshaft position detecting device 1 as shown in FIG. 1, the first timer 31 overflows again to the engine control device 4 at step 3 shown in FIG. 1. The second interrupt signal INT is generated, and the 256-28 value set in the second timer 32 is automatically reloaded into the first timer 31, and the second timer 32 has a value of 256-30. Reset.

The engine controller 4 receives the second interrupt signal INT, recognizes that the BTDC value of the third cylinder is 114 °, and performs a TDC task such as TDC cycle calculation and air volume calculation.

Next, the section shown in FIG. When 28 pulse signals are input from the crankshaft position detecting device 1 as shown in FIG. 1, the first timer 31 again overflows at the part ④ shown in FIG. Generates a third interrupt signal INT, and the 256-30 value set in the second timer 32 is automatically reloaded into the first timer 31, and the second timer 32 has a 256-28 value. Is reset.

The engine controller 4 receives the third interrupt signal INT and recognizes that it is 114 ° of the BTDC value of the fourth cylinder, and performs a TDC task such as TDC cycle calculation and air volume calculation.

Next, the section shown in FIG. When 20 pulse signals are input from the crankshaft position detecting device 1 as shown in FIG. 1, the first timer 31 again overflows to the engine control device 4 at part ⑤ shown in FIG. 1. Generates a fourth interrupt signal (INT), the 256-28 value set in the second timer 32 is automatically reloaded into the first timer 31, the second timer 32 to 256-30 value Reset.

The engine controller 4 receives the fourth interrupt signal INT, recognizes that the BTDC value of the second cylinder is 114 °, and performs a TDC task such as TDC cycle calculation and air volume calculation.

Through the above process, as shown in ⑥ shown in FIG. 2, when the cam shaft is rotated once and the signal output from the cam shaft position sensing device 2 is in the low level "L" state, the setting value of the first timer 31 is changed again. The hex value FFH is set, the value of the second timer 32 is set to 256-30, and the interrupt device for the top dead center task performs the above process repeatedly.

The capacity of the first timer 31 is not limited to 8 bits.

Since the position of the cylinder to be controlled can be accurately determined, the top dead center task can be processed quickly and accurately, thereby improving the reliability of the engine control apparatus and executing the accurate engine control operation according to the driving state of the vehicle.

Claims (4)

Crankshaft position detecting means for changing a period of the output pulse signal in accordance with the rotation state of the crankshaft; Camshaft position detecting means for varying the period of the output pulse signal in accordance with the camshaft rotational state; Timer means for generating an interrupt signal by counting the number of pulses input from said crankshaft position detecting means; Comparing and determining the pulse signal output from the crankshaft position detecting means and the pulse signal output from the camshaft position detecting means to determine the position of the cylinder according to the rotation state of the crankshaft, and receives the interrupt signal from the timer means An interrupt apparatus for a top dead center task comprising an engine control means for performing task processing. The method according to claim 1, wherein the timer means comprises: a first timer (31) for counting the number of pulses output from the crankshaft position detecting means and generating an interrupt signal when the number of pulses reaches a certain number; When the first timer 31 generates an interrupt signal, the upper dead center task is configured to include a second timer 32 which reloads a previously set value into the first timer 31 and resets it to a new setting value. Interrupt device. 3. The interrupt apparatus as claimed in claim 2, wherein the first timer (31) generates an interrupt when an extra data is input as an 8-bit timer to generate an interrupt. The interrupting apparatus for a top dead center task as set forth in claim 1, wherein the timer means can use a memory built in the engine control means or a memory mounted separately from the outside.