Abstract:
The present invention comprises an Electronics Control Unit (ECU) power potential stabilizing circuit and an ECU reference potential stabilizing circuit. The ECU power potential stabilizing circuit eliminates noise and stabilizes voltage variation occurring when the electrical parts of automobile are activated by the power supplied through the ECU of the electronic accelerator, by impressing it to the power supply line and variable voltage supply line. The ECU reference potential stabilizing circuit eliminates the unnecessary spark noise and harmonics noise occurring on the power supply line, reference potential line and variable voltage supply line, by impressing it to the variable voltage supply line and reference potential line. It further stabilizes the voltage supplied to the ECU by compensating the voltage fluctuated due to disturbances.

Description:
BACKGROUND OF INVENTION 
     1. Field of Invention 
     The present invention relates to a variable voltage regulator for electronic accelerator in automobile which is designed to stabilize the voltage supplied to the variable voltage controller of the accelerator in the electronicallyautomobile engine, which controls the power of the automobile by controlling the throttle valve with an electronics control unit (ECU). 
     2. Brief Description of Related Art 
     As disclosed in the official Patent Disclosure 97 (Jul. 22, 1997) for general automobile engines which controls a throttle valve with an ECU, voltage fluctuation ratio of the variable resister ( 13 ), whose resistive value varies according to the accelerator when the driver operates the accelerator, is inputted to the ECU and pulse voltage is created. When the said pulse voltage is transmitted to the solenoid control unit ( 15 ), the said solenoid control unit ( 15 ) activates the solenoid ( 16 ) with respect to the number of pulses. Then, it controls the amount of burning gas that flows in the engine so that the driver may produce maximum engine power efficiently. 
     In general, an automobile engine supplies electric power created from the generator to the battery and the battery distributes electric power to all electronic parts in the automobile. 
     As shown in FIG. 1, for automobiles that increase and decrease the engine power with the electronic accelerator, the power supply line ( 10 ) of the variable resister ( 13 ) and the reference potential line ( 11 ) are connected to both ends of the variable resister to maintain specific resisting value when the driver operates the accelerator. The voltage value of the said variable resister ( 13 ) varies according to the operation by the automobile driver, voltage varies due to the power supply line ( 10 ) connected to the ECU ( 14 ), the voltage varied at the variable voltage supply line ( 12 ) is supplied to the said ECU ( 14 ), the said ECU ( 14 ) recognizes the voltage and transmits the pulse signal to the solenoid control unit ( 15 ) and the said solenoid control unit ( 15 ) activates the solenoid ( 16 ) so that the driver may control the engine power by opening and closing the throttle valve (not depicted in the drawing) mechanically connected to the solenoid. 
     SUMMARY OF INVENTION 
     In the above electronicallyengine, although a fixed voltage shall be supplied to the variable resistance, the automobile is loaded with a higher overflowing lighting load than the rated current in such a case when the lights are on. This causes the voltage supplied to the generator or the battery to drop suddenly. This further causes electronic noise such as harmonics noise and spark noise to flow in the power of the control system of the automobile which uses a lot of electronic parts, relays and electronic control circuits that are composed of many electric parts and semiconductors. 
     The voltage supplied to the variable resistance of the accelerator varies according to the type of automobile, but fixed voltage of 5V or 12V is necessary so that the driver can control the engine power to the desired level. Otherwise, the power voltage supplied to the variable resistance of the accelerator fluctuates due to the electrical characteristics-of the aboveautomobile parts, the voltage between the ground and the reference potential fluctuates and unnecessary noise is created so that the engine does not operate according to the driver&#39;s intention. Further power control by the ECU is not stable. This will consequently increase the gas consumption in the engine, creating air pollution due to unstable combustion as well as decrease the riding comfort of the automobile. 
     To solve said problems in current automobiles, the present invention is directed to a variable voltage regulator for an electronic accelerator in an automobile which comprises: an ECU power potential stabilizing circuit which eliminates noise and stabilizes voltage variation occurring when electrical parts of an automobile are activated by the power supplied through the ECU of the electronic accelerator, by impressing it to the power supply line and variable voltage supply line; and an ECU reference potential stabilizing circuit which eliminates the unnecessary spark noise and harmonics noise occurring on the power supply line, reference potential line and variable voltage supply line, by impressing it to the variable voltage supply line and reference potential line. It further stabilizes the voltage supplied to the ECU by compensating the voltage fluctuated due to disturbances. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     FIG. 1 is an illustrative drawing of the conventional electronic automobile accelerator. 
     FIG. 2 is a circuit diagram of the present invention. 
    
    
     DETAILED DESCRIPTION 
     The functions and structure of the present invention as depicted in the drawings are as follows:As seen in FIG. 2, a variable voltage regulator ( 100 ) for an electronic accelerator in an automobile comprises; an ECU power potential stabilizing circuit ( 200 ) which eliminates noise transmitted from the power supply line ( 10 ) and stabilizes voltage fluctuation of the power supply line; and an ECU reference potential stabilizing circuit ( 300 ) which stabilizes noise and voltage fluctuations that occur between the reference potential line ( 11 ) and ground and between the variable voltage supply line ( 12 ) and the reference potential line ( 11 ). 
     Referring now to the circuit diagrams of the ECU power potential stabilizing circuit ( 200 ) and the ECU reference potential stabilizing circuit ( 300 ), a variable resistance ( 13 ) and a cathode of diode  1  (hereinafter to be called “D 1 ”) are connected in parallel with the power supply line ( 10 ). A capacitor (hereinafter to be called “C 1 ”) is connected in parallel to both ends of the D 1 , an anode of D 1  is connected to the resistance (hereinafter to be called “R 1 ”), the anode of diode  2  (hereinafter to be called “D 2 ”) is connected to capacitor  2  (hereinafter to be called “C 2 ”), one end of the C 2  is earthed, one end of the R 1  is connected to the branch point “N” of the variable voltage supply line ( 12 ) and the cathode of D 2  is connected to the branch point “O.” The anode of diode  3  (hereinafter to be called “D 3 ”) and resistance  2  (hereinafter to be called “R 2 ”) are connected to the branch point “O” whereas the cathode of D 3  is earthed to one end of the R 2 . 
     One end of capacitor  3  (hereinafter to be called C 3 ) connected to the branch point “N” of the said variable voltage supply line ( 12 ) is connected to the branch point “Q” of the reference potential line, one end of the resistance  3  (hereinafter to be called “R 3 ”) connected to the branch point “O” of the said variable voltage supply line ( 12 ) is connected to the cathode of diode  4  (hereinafter to be called “D 4 ”) and the anode of D 4  is connected to the branch point “P” of the said reference potential line ( 11 ). Finally, one line of C 4  is connected to the branch point “P” of the reference potential line while the other one line is connected to the resistance  4  (hereinafter to be called “R 4 ”) and R 4  is connected to the anode of diode  5  (hereinafter to be called “D 5 ”) and the cathode of diode  6  (hereinafter to be called “D 6 ”). The cathode of D 5  and the anode of D 6  of the cathode connect the anode of the diode  7  (hereinafter to be called “D 7 ”) and the cathode of diode  8  (hereinafter to be called “D 8 ”) whereas the cathode of D 7  and the anode of D 8  are earthed. 
     The above ECU power potential stabilizing circuit ( 200 ) eliminates harmonics noise and spark noise transmitted to the said power supply line ( 10 ) by absorbing them to the earth through C 1  and C 2 . The voltage supplied from the said power supply line ( 10 ) is connected to the variable resistance supply line through D 1 , R 1  and the branch point “N.” It is finally earthed through the R 2  after it passed the branch point “O.” Although the resisting value of the variable resister may vary according to the type of automobile and the manufacturer, the voltage supplied from the power supply line is 5V and the variable resister is 5k Σ in this case. The variable resister may vary between 0.5k Σ˜5k Σ according to the variable locations of the variable resistance. R 1  is 1M Σ and R 2  is 1.5M Σ, and these are approximately 20˜30 times the resistance value of the variable resister. And, their effect to the resistance value of the variable resister ( 13 ) is not considerable. However, by using the power voltage supplied through D 1 , they compensate part of the voltage reduced by the voltage drop caused by the use of highelectric systems such as airand lights and reduce the potential difference, occurred between the variable voltage line and earth, with R 2  so that the voltage fluctuation on the variable voltage supply line ( 12 ) is suppressed and D 1  interrupts the potential that may give an effect to the power supply line from the earth. 
     The power voltage supplied through D 1  is charged by C 2  whose capacity is 470 pF. When the supply voltage drops below the specific level due to a disturbance, C 2  discharges through R 1  and R 2  and compensates the potential difference between the power supply line and the variable resistance voltage supply line to mitigate the abrupt increase of potential of the variable voltage supply line ( 12 ). 
     The potential difference between the earth and the said reference potential line ( 11 ) occurs within the range of 0.05˜0.3V according to the use of such electric loads as automobile airand lights although this may differ according to the type of automobile. A noise created from other electric parts of an automobile is transmitted through the said reference potential line ( 11 ) and variable resistance voltage supply line. 
     According to such noise voltage, a higher voltage than the normal voltage of a reference throttle valve opening ratio is supplied to the ECU so that the said ECU transmits unnecessary pulse signals to the solenoid control unit, and the said solenoid opens to supply unnecessary gas to the engine. 
     Therefore, the ECU reference potential stabilizing circuit ( 300 ) eliminates the noise contained in the variable voltage supply line ( 12 ) and the reference potential line ( 11 ) by earth through the C 3 , C 4 , R 4 , D 5 , D 6 , D 7  and D 8  circuits. The noise created from the ECU is earthed and eliminated through the C 3 , C 4 , R 4 , D 5 , D 6 , D 7  and D 8  circuits that are connected to the reference potential line ( 11 ). 
     When the potential difference abruptly increases or decreases due to disturbance by the noise between the reference potential line ( 11 ) and earth, controlling the engine power becomes difficult because the RAM (Random Access Memory) of the ECU changes the memory data, responds to the voltage and quickly deletes and creates the data so that the pulse that controls the solenoid is not created. Therefore, abrupt voltage fluctuation caused by the noise between the reference potential line ( 11 ) and earth is properly controlled by the D 5 ˜D 8 . 
     Although the overall structure of the present invention is described above, the applications of the present invention are not limited to the above, but it may be applied in many different ways within the scope of the specifications, drawings and claims of the present invention. 
     In supplying the variable voltage to the ECU according to variations of the variable resistance of the electronic accelerator of an automobile, the present invention described above minimizes the effect on the voltage value inputted in the ECU, enables the driver to control the output of an automobile&#39;s engine by interrupting various electric noises, increases the riding comfort, increases mileage by preventing unnecessary burning of gas and reduces air pollution and extends the life of an automobile.