Apparatus and method of controlling electronic continuously variable valve timing

Patent metadata

Field	Value
Publication number	US-10190449-B2
Application number	US-201615285027-A
Country	US
Kind code	B2
Filing date	Oct 4, 2016
Priority date	Oct 5, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

An apparatus and method of controlling an electronic continuously variable valve timing (CVVT) is provided. The apparatus includes a sensor disposed in a motor facing a reducer and an intelligent motor controller. The sensor determines a rotation speed of a first and second projection of a first and second rotation member and generates a sensing signal that corresponds to an output waveform of each rotation speed and inputs the signal to an intelligent motor controller coupled to the motor. The intelligent motor controller receives the signal and separates a crank shaft and cam shaft position signal. The signals are compared to detect an actual phase angle of the suction or exhaust valve. A phase deviation between the detected, actual and predetermined target phase angle is calculated.

First claim

What is claimed is:

1. An apparatus for controlling an electronic continuously variable valve timing (CVVT) comprising:
a motor and a reducer, configured to adjust a relative rotation phase of a cam shaft that rotates with a crank shaft of a combustion engine to adjust a valve timing of a suction valve or an exhaust valve;
a sensor disposed in a border of a side of the motor facing the reducer configured to determine a rotation speed of a first projection of a first rotation member which is coupled to the crank shaft to rotate;
a second projection of a second rotation member having a rotation speed configured to be determined by the sensor which is gear-coupled to the first rotation member at a certain gear ratio and is coupled to the cam shaft to rotate, wherein the sensor is configured to output a sensing signal that corresponds to an output waveform which corresponds to each of the rotation speeds; and
an intelligent motor controller coupled to the motor, wherein the intelligent motor controller is configured to
receive the sensing signal from the sensor,
separate a crank shaft position signal that corresponds to a rotation of the first projection and a cam shaft position signal that corresponds to a rotation of the second projection from the sensing signal,
compare the crank shaft position signal and the cam shaft position signal to detect an actual phase angle of the suction valve or the exhaust valve, and
determine a phase deviation between the detected actual phase angle and a predetermined target phase angle,

wherein the first projection and the second projection are disposed along a circumferential direction of a side of the reducer facing the motor.

2. The apparatus of claim 1 , wherein
the first projection is included in one of a plurality of projection groups,
wherein the plurality of projection groups are disposed along the circumferential direction on a side of the first rotation member facing the motor and are spaced apart from each other, and
wherein the plurality of projection groups are disposed at a spacing angle with respect to a center of the first rotation member.

3. The apparatus of claim 2 , wherein the first rotation member includes an arc-shaped slot disposed between adjacent ones of the plurality of projection groups.

4. The apparatus of claim 3 , wherein the second projection has an arc-shaped length that is greater than an arc-shaped length of the first projection and is configured to be adjusted along the arc-shaped slot at a rotation angle which is similar to a rotation angle of the cam shaft.

5. The apparatus of claim 3 , wherein the second projection has a length less than an aperture length of the arc-shaped slot, and the second projection is exposed through the arc-shaped slot and is sensed by the sensor.

6. The apparatus of claim 1 , the intelligent motor controller further comprising:
an actual phase angle (APA) detector, the APA detector that includes,
a signal separator configured to separate the crank shaft position signal and the cam shaft position signal from the output waveform that corresponds to the sensing signal; and
a signal operator configured to perform an arithmetic operation or a comparison operation on the crank shaft position signal and the cam shaft position signal to detect the actual phase angle.

7. The apparatus of claim 1 , wherein the reducer is a gear train or a general reducer having planetary gears.

8. The apparatus of claim 1 , further comprising:
a sensor installation component, at which the sensor is disposed, provided on a first side of a casing of the motor; and
a controller installation component, at which the intelligent motor controller is disposed, provided on a second side of the casing.

9. An electronic continuously variable valve timing (CVVT) control method performed by an electronic CVVT control apparatus comprising:
actuating a motor and a reducer to adjust a relative rotation phase of a cam shaft in cooperation with a crank shaft of a combustion engine to adjust a valve timing of a suction valve or an exhaust valve;
sensing, by a sensor coupled to the motor, a rotation speed of a first projection of a first rotation member which is coupled to the crank shaft to rotate,
sensing in a time-serialized sequence a rotation speed of a second projection of a second rotation member which is gear-coupled to the first rotation member at a certain gear ratio and is coupled to the cam shaft to rotate;
generating a sensing signal having an output waveform that corresponds to the rotation speed of the first projection and the rotation speed of the second projection;
inputting the sensing signal to an intelligent motor controller coupled to the motor;
separating a crank shaft position signal that corresponds to the rotation speed of the first projection and a cam shaft position signal that corresponds to the rotation speed of the second projection from the sensing signal by using a signal separator of the intelligent motor controller;
comparing the crank shaft position signal and the cam shaft position signal to detect an actual phase angle of the suction valve or the exhaust valve by using a signal calculator;
determining a phase deviation between the detected actual phase angle and a predetermined target phase angle; and
determining, by the intelligent motor controller, a duty value to adjust a motor torque of the motor, based on the determined phase deviation.

10. The electronic CVVT control method of claim 9 , the determining of the duty value further comprises:
receiving the predetermined target phase angle via a digital serial communication of controller area network (CAN) communication and RS-485 communication;
detecting the actual phase angle by using the crank shaft position signal and the cam shaft position signal from the sensor;
determining the phase deviation between the target phase angle and the actual phase angle;
setting an addition or subtraction torque value for an output torque of the cam shaft, based on the calculated phase deviation; and
determining a duty value corresponding to the addition or subtraction torque value.

Assignees

• Hyundai Kefico Corp

Inventors

• Kim Lae Kyeom
• Kim Nam Kyu

Classifications

• F02D41/009 Primary

  using means for generating position or synchronisation signals · CPC title

• F02D2250/12

  Timing of calculation, i.e. specific timing aspects when calculation or updating of engine parameter is performed · CPC title

• F01L2009/0478

  Mechanical Engineering · mapped topic

• F01L2800/14

  Determining a position, e.g. phase or lift · CPC title

• F01L1/344

  changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear · CPC title