KR200189457Y1 - Apparatus for detecting an engine rpm of hybrid-type electric vehicle - Google Patents

Abstract

The present invention is to rectify the power of each phase of the generator directly connected to the engine, and relates to the engine speed detector of the hybrid electric vehicle to measure the speed of the engine by measuring the output frequency at this time.

The engine speed sensor of the hybrid electric vehicle according to the present invention includes an engine which is an internal combustion engine, a generator for generating AC power by receiving rotational force from the engine, a rectifier for rectifying AC power generated by the generator, and a constant voltage for generating a reference voltage. Means, a comparator for comparing and outputting the magnitude of the signal input from the rectifier and the signal input from the constant voltage means, and counting means for counting the output signal of the comparator to detect the number of revolutions of the engine.

Therefore, according to the present invention, the engine speed detection signal of a high frequency band can be provided to the microcomputer for controlling the constant speed operation and the generator, so that the rotation speed can be detected well. Therefore, even if the load changes suddenly, an immediate response is possible.

Description

Engine Speed Detector for Hybrid Electric Vehicles

The present invention relates to an engine speed sensor of a hybrid electric vehicle, and in particular, rectifies the power of each phase of a generator directly connected to the engine, and at this time, measures the output frequency to rotate the engine of the hybrid electric vehicle to measure the engine speed. It is about a water detector.

In general, a hybrid vehicle refers to the use of an internal combustion engine for power generation or power generation for the purpose of supplementing power performance, such as driving performance and range, which are the biggest challenges in disseminating electric vehicles. . In this hybrid system, when the internal combustion engine is used for power generation, an apparatus for detecting the engine speed is provided to control the constant speed of the engine and control the generator.

That is, the conventional engine speed detection device receives an ignition signal from the engine control unit and uses a signal for detecting the engine speed. That is, the rotation speed of the engine was detected by receiving an ignition signal, which is a signal for generating sparks with a spark plug, from a mixer compressed by a piston from an engine which is an internal combustion engine.

However, the conventional rotational speed detection through the ignition signal is not suitable as a signal for controlling the engine due to the characteristics of the microcomputer. In microcomputer control theory, the sampling frequency for detecting the engine speed is more than twice the response speed of the engine, so that it can be controlled well. Conventional ignition signal is very low (50-150Hz), which makes it difficult to control the engine at constant speed. There was this.

The present invention has been made to solve the above-mentioned problems, and its object is to provide an engine speed sensor of a hybrid electric vehicle that generates a frequency of a good magnitude capable of detecting the engine speed in a microcomputer that controls the engine at constant speed. To provide.

1 is a circuit diagram of an engine speed sensor of a hybrid electric vehicle according to the present invention,

2a is an output waveform diagram of a generator;

2b is an output waveform diagram of the rectifier;

2C is a waveform diagram input to a comparator;

2D is an output waveform diagram of a comparator.

* Description of the symbols for the main parts of the drawings *

10: generator 20: rectifier

21-26: Diode R1-R2: Voltage divider

C1-C2: Capacitor 31: Zener Diode

40: Comparators

The construction of the present invention for achieving the technical problem, an engine which is an internal combustion engine, a generator for receiving the rotational force from the engine to generate an AC power, a rectifier for rectifying the AC power generated in the generator, a constant voltage for generating a reference voltage Means, a comparator for comparing and outputting the magnitude of the signal input from the rectifier and the signal input from the constant voltage means, and counting means for counting the output signal of the comparator to detect the number of revolutions of the engine.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of an engine speed sensor of a hybrid electric vehicle according to the present invention, and FIG. 2 is an output waveform diagram of FIG. 1.

First, a configuration thereof will be described with reference to FIG. 1.

Generator 10, which is directly connected to the engine to generate a three-phase power, rectifying unit 20 for rectifying the three-phase power generated from the generator 10, converting the rectified power through the rectifier 20 to direct current Capacitors (C1, C2) (capacitor), Zener diode (31) for making a reference voltage of a certain magnitude, Comparator (40) for comparing the output power of the capacitors (C1, C2) and the output power of the zener diode (31) ), A microcomputer (unsigned) for counting the signal output from the comparator 40 to detect the engine speed.

Generator 10 of the above-described configuration is a permanent magnet type generator, the approximate structure of which is installed in the rotor coil fixed to a predetermined position of the generator stator, and the permanent magnet installed so as to be rotatable at a predetermined interval and the armature coil It can be explained electronically. In this structure, when the permanent magnet rotor rotates, an electromotive force is induced between the armature coil and the permanent magnet rotor by Fleming's right hand law.

The rectifier 20 is provided with a rectifier for converting an AC component of each phase generated by the generator 10 into a DC component, and is provided with a rectifier for preventing the current of each phase from being reversed.

Hereinafter, the operation of the engine speed sensor of the hybrid electric vehicle according to the present invention will be described with reference to the above-described components and FIG. 2.

First, in the hybrid electric vehicle, when driving of the vehicle is started while the battery is charged, driving power is supplied to the load by discharging the battery. After that, the engine, which is an internal combustion engine, is not operated until the state of the remaining capacity of the battery is continuously discharged as the vehicle runs, and reaches a predetermined lower limit, and is driven by pure electrical energy from the battery. When the remaining capacity of the battery reaches a predetermined lower limit by continuous operation, the engine, which is an internal combustion engine, is automatically ignited to generate necessary power through driving of the generator 10.

That is, the three-phase electric power as shown in FIG. 2A is output from the generator 10 directly connected at an engine speed of 1: 1 by ignition of an engine which is an internal combustion engine. The output three-phase power is converted into a DC power as shown in FIG. 2B through rectifying elements 21, 22, and 23 provided in each phase. The converted DC power is controlled in size through the voltage divider R1 and R2, and the output voltage of the rectifier 20 is converted closer to the DC component through the capacitors C1 and C2 provided at the output terminal of the rectifier 20. do. The comparator 40 performs the comparison operation by receiving the power supply passing through the capacitors C1 and C2 as the inverting input (-) and receiving the output from the zener diode 31 as the constant voltage element as the non-inverting input (+). 2C illustrates waveforms input to the inverting terminal (-) and the non-inverting terminal (+) of the comparator 40. When the rectifier voltage input to the inverting terminal (-) is greater than the constant voltage of the zener diode 31 input to the non-inverting terminal (+) in the comparator 40, the comparator 40 converts the square wave of a predetermined size into a micro Print it to your computer. Therefore, the microcomputer can measure the rotation speed of the engine well by counting the frequency of the square wave output from the comparator 40. That is, the frequency f is a frequency in the microcomputer because the number of poles P of the generator 10 and the rotational speed N of the generator 10 (same as the engine speed) are related to f = (P * N) / 20. Counting the number of revolutions (N) can be seen.

According to the present invention as described in detail above, it is possible to provide a high speed engine speed detection signal to the microcomputer for controlling the constant speed operation and the generator, it is possible to detect the rotation speed well. Therefore, even if the load changes suddenly, an immediate response is possible.

Claims (1)

Generator 10 for outputting a three-phase AC voltage according to the driving of the engine, and a rectifier 20 composed of a plurality of diodes 21-26 connected to each phase of the generator 10 for full-wave rectification of the output voltage. In the engine speed sensor of the hybrid electric vehicle having a voltage divider (R1, R2) for dividing the output voltage of the rectifier 20 to a predetermined magnitude, One output terminal of the voltage dividing resistors R1 and R2 is inverted (−), and a capacitor C2 connected in parallel to the output terminal of the voltage dividing resistor and one output terminal of the voltage dividing resistors R1 and R2 and the inverting end ( The voltage divider is connected via a zener diode 31 so as to receive an output voltage of the rectifier 20 through a condenser C1 connected in series. The other output terminal of R1 and R2 and the non-inverting terminal (+) are connected, and the comparator outputs a square wave of a predetermined magnitude when the signal input from the inverting terminal (-) is larger than the constant voltage input from the non-inverting terminal (+). 40, Engine speed sensor of a hybrid vehicle having a microcomputer electrically connected to the comparator 40 so as to count the frequency of the square wave output from the comparator 40 to detect the rotational speed according to the driving of the engine.