JPS5931406A - Detector for angle of rotation - Google Patents

Abstract

PURPOSE:To prevent erroneous detection due to variation in engine rotation, etc., by providing plural projection parts for rotation angle signals and a single projection part for a reference rotation angle signal to the circumference of a timing rotor. CONSTITUTION:The timing rotor 1 has the single tooth part (a) for the reference signal and plural tooth parts (b) for rotation angle signals. When the timing rotor 1 comes closer to a magnet pickup coil, a voltage is developed by variation in magnetic flux and this voltage is 0V where the magnet pickup coil and timing rotor 1 faces each other. The output of the magnet pickup 10 is supplied to a trigger +Vth circuit 20 and a trigger Vth circuit 30. When the output waveform of the magnet pickup 10 is greater than a plus voltage XV (threshold value), the circuit 20 generates an output for the time and also lowers a plus trigger XV to a little lower voltage when it goes up above the plus voltage XV to prevent malfunction due to noise, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sub-type ignition advance device or an electronic fuel injection bag [
The present invention relates to an engine control device such as No. 17, and particularly to a rotation angle detection device that detects an engine rotation angle cylinder reference signal.

Conventionally, it has been proposed to change the magnitude of the output value of a portion of the detection signal (N signal) output of one rotation angle sensor or to omit a portion of the N signal output. However, both engine rotation fluctuations (cycle by cycle)
Also, fluctuations in the rotational speed during sudden deceleration or acceleration may cause the magnitude of the N signal output or the signal time to vary at uneven intervals, so there is a risk of erroneous determination. Furthermore, when a part of the N signals is to be omitted, the N signals must be divided more finely than the rotational fluctuations, which is disadvantageous in terms of manufacturing costs and signal processing.

The present invention has been made in view of the above problems, and is
By providing an unevenly spaced signal (G signal) in the signal, the positive and negative output intervals of the N signal change within a small angular range, and the G
The object of the present invention is to provide a rotation angle detection device in which the signal portion changes over a large angular range and can prevent erroneous detection due to engine rotation fluctuations.

FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention. This is a conventionally known device consisting of a magnet (not shown), a timing rotor 1, and a pickup coil (not shown). The timing rotor 1 has a single tooth section a for a reference signal and a plurality of tooth sections for rotation angle signals (FIG. 5(A)). When the timing rotor 1 approaches the magnetic pickup coil, a voltage k is generated due to a change in magnetic flux, and when the magnet, pickup coil, and timing rotor 1 face each other, a voltage of f becomes Ov.
1"8 (m31XJ (B)). The output of the magnet pink up 10 (4, the trigger + vth circuit 20 and the trigger are supplied to the -Vth circuit 30. The trigger + vth circuit 20 is the output of the magnet in' When the waveform is equal to or higher than the Noras electric [E
The output of the trigger + Vth circuit 20 is set to a slightly low voltage to prevent malfunction.
0 and G/N signal discrimination 1'iJ path 45. The output of the +vth circuit 20 is supplied to a charging time circuit 40, and is configured to output when the capacitor is charged and discharged by the capacitor capacity. trigger vth
The circuit 30 is configured to output only for the time when the output waveform of the magnet pink-up 10 exceeds a negative voltage FFF, YV (threshold value), and the output is supplied to the G/N signal discrimination circuit 45. The G/N signal discrimination circuit 45 is supplied with the output of the trigger +vth circuit 20, the output of the charging time circuit 40, and the output of the trigger -vth circuit 30.

The G signal is determined to be a G signal i when the output of the charging time circuit 40 and the output of the trigger vth circuit 30 are not synchronized, and the opposite is true for the N signal; When the outputs of 30 are synchronized, it is determined that the output is N. The discrimination signal is supplied to gau 5 Q. FIG. 2 shows a block diagram of gau 50. The ECU 5O has an input section 51 to which the output from the ()/N signal discrimination circuit 45 is supplied, and the output is supplied to the \ signal counter 52. The N signal counter 52 counts a/N (IJ times the output of the lit number discriminating circuit 45, and
It is reset by a signal and its output is supplied to the CPU 53. The CPU 53 is supplied with the output of the N signal counter 52 (hereinafter referred to as N (= sign)) and the output of the G/N signal discrimination circuit 45 (hereinafter referred to as the G signal). The G signal (reference signal) is used to calculate the ignition timing, closing angle, injector injection time, and timing sensor signal acquisition timing, and is configured to fail when the output of the N signal counter 52 disappears.CPU 53
The output of is supplied to the output driver 54. In response to signals from the CPU 53, the output driver 54 provides ignition timing and closing angle signals to the igniter 60, and provides injector injection period and time signals to the injector 70. ”Finance Department 55
is Human Resources Department 51, C! It supplies power to the PU 53 and the output drive section 54, and constitutes a part of the ECU 3O. igniter 60
is comprised of a conventionally known device for energizing and igniting the coil. The injector 70 is constructed of a conventionally known injector that injects fuel in response to a control signal.

FIG. 4 shows a time chart of the operation of the sensor of the present invention, where a is a magnet) l? Tsukuatsuzo waveform, b is trigger + vth circuit output, C is charging time circuit output, d is trigger ■th circuit output, θ is G signal discrimination amount 16 output, f is N
The signal discrimination circuit output, g is the first and fourth cylinder bending start range, h is the eleventh and fourth cylinder ignition range, 1 is the second...
The 6th cylinder energization start range, and j are the 2nd cylinder energization start ranges. The 5th cylinder ignition range is shown respectively. Magnet pick-up 7
°10 is the glass voltage due to rotation, minus wt
E is generated and its output is triggered → -vth circuit 20 and t') lj' -VthI! 7If<s 30 ni f
ig Book # Sarel. The +Vth circuit 20 is a magnetic pickup, and the output waveform of 10 is a positive voltage XV.
When the above is reached, a rectangular wave is generated for that period of time, and its output is determined by the charge 'Fi1 time circuit 4° and the G/N signal discrimination circuit 45.
supplied to The charging time circuit 40 charges the capacitor with the rectangular wave output from the trigger +vth circuit 2o, and outputs the lH1 wave at 1:00 when the capacitor is discharged. The capacitance 6f of the capacitor is determined so that the output timing of the class 71j wave is output when the waveform of the magnetic pick Azzo 1o becomes below QV. The waveform of the magnet Big Agno 10 is also supplied to the −■th circuit 30, and the trigger vth
In circuit 30, is the output of the waveform of the magnet Bic Acno 1° or negative'? When the voltage exceeds fl, FF, YV, a C:l short # wave is generated for that time, and its output is supplied to the G/N signal discrimination circuit 45. The G/N number discrimination circuit 45 uses the rectangular wave output from the charging time circuit 4o and the trigger vth circuit 3.
When the rectangular wave of the output of 0 is synchronized, it is determined as the N signal, and when it is not synchronized, the rectangular wave of the output of the charging time circuit 40 is determined as the G signal, and the output is supplied to the ECU 3O. EC
When supplied to U5Q, CPU 53 operates according to the four-chart shown in FIG. Stetu 7°1
oO is the start. The controller 110 reads a G signal, an N signal, and a throttle opening signal (not shown) (or an intake air amount, an intake air amount EE signal), and proceeds to the controller 120. Stella 7°120 determines whether 5 N signals are occurring for every 1 G signal, and if they are not occurring, it is determined to be a failure and proceeds to STETSU 7°125, turning off the ignition and turning off the injector. shall be. If it is occurring, step 1
Proceed to 30. STETSU 7°130 is N signal N engineering ~ Hz
(for the second and third cylinders) and N4 to N5 (for the first and third cylinders)
In the case of the fourth cylinder), the engine rotation speed is determined from the time, and the process proceeds to Stella 7'140. Step 7° 140 determines the ignition timing, energization start timing, period, and injector injection period from the engine speed and throttle opening (or intake air amount, intake negative pressure signal), and proceeds to step 150.

Step 7°150 counts down to the energization start time determined in step 140 based on the N signal N2 (for the second and sixth cylinders) and N5 (for the first and fourth cylinders), and energizes the igniter 60. Start and proceed to Stetsuno 160. Step 160 includes an N signal Nl (
(for the 1st and 4th cylinders) and N4 (for the 2nd and 6th cylinders), count down to the ignition timing determined at 7°140 and ignite.
Go to 0.

Step 170 causes the injector to inject in synchronization with the G signal.

FIGS. 6 and 7 show another modification of the timing rotor and the timing diagram thereof, in which the qkN signal is generated at regular intervals without missing. The protrusions a for the N signal are arranged at equal intervals, and the protrusions for the G signal are inserted between them.

The waveforms of each part (a) to (1) in Fig. 7 are shown in (a) in Fig. 4.
) to (1) are shown corresponding to each part wave throat.

FIGS. 8 and 9 show the case where N signals are generated at irregular intervals without missing. FIG. 8 shows the shape of the timing rotor. The protrusions A for the N signal are arranged at irregular intervals, and the protrusions A for the G signal are inserted between the N signals that are not used for the countdown of the ignition and energization start period. 2I of countdown for ignition timing and start of energization! By making the i-value smaller, the variation can be reduced. FIG. 9 shows a time chart when the timing rotor of FIG. 8 is used. The waveforms of parts (a) to (1) in FIG. 9 are also shown corresponding to the waveforms of parts (a) to (1) in FIG. 4, respectively.

FIGS. 10(A) and 10(B) show an example in which the convex portion and the four portions of the timing rotor are reversed from the previous ones. FIG. 11 shows a block diagram of a second embodiment when the timing rotor of FIG. 10 is used. Portions corresponding to those in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted. That is, in this embodiment, the output from the trigger vth circuit 30 is supplied to the charging time circuit 40 and the G/N signal discrimination circuit 45, respectively.

The output of the trigger +vth circuit 20 is supplied only to the G/N signal discrimination circuit 45.

FIGS. 12(A), (B) and FIG. 16 show further examples of timing rotors in which the N signal is generated at irregular intervals without missing, and the protruding portions of the G signal and the protruding portion of the N signal are adjacent to each other. A modified example and a timing diagram thereof are shown. The positional relationship between the protrusion C for the G signal and the protrusion C for the N signal is made unequal, and the output waveform of the trigger vth circuit 30 in FIG. A wave is formed by the G-N signal discrimination circuit 45, and the bird is + in that section.
Since the output of the vth circuit 20 is taken as the G signal, and the output of the other trigger + vth times #J20 is taken as the N signal, the G signal and the N signal can be quickly distinguished.

The waveforms of each part (a) to (1) in Fig. 13 are also (
The diagrams correspond to the waveforms of each part of a) to (1). ,.

According to the present invention, a plurality of protrusions (or open parts) for rotation angle signals (N signals) are provided around the timing rotor, and a rotation angle reference signal CG multiplied signal provided at arbitrary intervals between these protrusions is provided. By providing a single protruding part of the engine, it is possible to accurately detect the rotation angle against fluctuations in engine rotation and changes in revolution speed during sudden deceleration or acceleration. It is advantageous in terms of manufacturing cost and signal processing because it does not need to be divided into small pieces.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the first embodiment of the present invention, FIG. 2 is a block diagram of the ECU circuit of FIG. 1, and FIGS. 3(A) and (13) are the timing rotor used in FIG. 1. and a diagram showing the output waveform of the magnetic pickup,
4 is a timing diagram for explaining the operation of the embodiment shown in FIG. 1, and FIG. 5 is a timing diagram for explaining the operation of the rotation angle detection circuit 1 shown in FIG.
? +2 For clarity, Figures 6 (A) and (B) are diagrams showing other variations of the timing rotor used in the embodiment of Figure 1 and output waveforms of the magnetic pickup, and Figure 7. 6 is a timing diagram for the operation of the first embodiment when the timing rotor shown in FIG. 6 is used, and FIG. FIG. 9 is a timing diagram showing the operation of the first embodiment when the timing rotor shown in FIG. 8 is used, and FIG. 11 is a block diagram showing the second embodiment of the present invention when using the timing rotor 10'& 1, and 12 (A) and (B) are timing diagrams showing the output waveform of the magnetic pickup. A diagram showing yet another modification of the rotor and the output waveform of the magnetic pickup, m13J! If is the 12th
Second actual h'1 when using the timing rotor shown in the figure! FIG. 4 is a timing diagram illustrating example operation. 1... Timing rotor 10... Magnetic pickup 20... Trigger circuit 30... Trigger circuit 40... Charging time 1i1 path 45... G/
N signal discrimination circuit representative: Asamura Kogai, 4 people

Claims (1)

[Claims] +11 A timing rotor that rotates in synchronization with the rotation of the engine, a magnetic pickup that magnetically detects the rotation of the timing rotor, and a rotation angle that generates a rotation angle signal based on the output signal of the magnetic pickup. A rotation angle detection device including a detection circuit, wherein the timing rotor has a plurality of teeth for rotation angle signals and a single tooth for a rotation angle reference signal around the timing rotor. Device. (2) In the detection device according to Claim No.
a second circuit having a negative threshold; a charging time circuit for charging the first circuit by a positive output signal of the circuit and generating a predetermined delay time signal; A positive output signal of the first trigger circuit, a negative output signal of one circuit of the second trigger circuit, and a delay time signal of the charging time circuit are applied, and the delay time signal and the negative output signal are temporally a determining circuit that determines the presence of the reference signal when the reference signal is asynchronous, and determines the presence of the rotation angle signal when the delay time signal and the negative output signal are temporally synchronous. Angle detection device.