KR19980043949A - Engine speed control device of hybrid electric vehicle - Google Patents

Abstract

The present invention relates to an engine speed control device for a hybrid electric vehicle, comprising: power supply means for dividing and supplying power to each device; Signal input means for inputting an engine speed signal and a target speed signal; A control for outputting a corresponding motor driving signal so that the engine speed driven and detected according to the power supplied from the power supply means reaches a target speed, and outputting a display signal for displaying the currently detected engine speed and the target speed; Means; Motor drive means for driving the motor in accordance with the motor drive signal output from the control means; And display means for displaying the engine speed and the target speed detected according to the display signal output from the control means. In the hybrid electric vehicle, the engine speed is quickly changed to the target speed according to the vehicle driving state. It can be controlled to reach, and the engine for charging can be driven efficiently according to the engine speed set by the user.

Description

Engine speed control device of hybrid electric vehicle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine speed control apparatus for a hybrid electric vehicle, and more particularly, to an engine speed control apparatus for a hybrid electric vehicle for efficiently controlling the rotation speed of a charging engine.

BACKGROUND ART Conventional automobiles are mainly driven by driving gasoline engines, and electric vehicles driven by electric motors have been developed due to an increase in environmental pollution caused by gasoline engine vehicles.

Gasoline cars have the disadvantage of increasing the environmental pollution by exhausting a lot of exhaust gas, electric vehicles have the advantage of preventing environmental pollution, but there is a disadvantage that can not run for a long time because it is driven by a battery.

In order to solve the disadvantages of the gasoline vehicle and the electric vehicle as described above, the hybrid vehicle is a vehicle that combines the functions of the gasoline vehicle and the electric vehicle.

The hybrid electric vehicle is a vehicle in which a general gasoline engine driving function and an electric motor driving function are inherent. In other words, a hybrid electric vehicle refers to a vehicle that can be driven by a general gasoline vehicle or an electric vehicle as needed.

Since hybrid electric vehicles are composed of components different from conventional gasoline and electric vehicles such as engines, alternates, batteries, and motors, various driving methods such as engine alternator on / off control according to battery power conditions are required when driving a vehicle. do.

The driving mode of the hybrid electric vehicle is a hybrid emission vehicle (HEV) mode for driving a gasoline engine, that is, a mode for driving the vehicle as a gasoline vehicle, and a zero emission vehicle (ZEV) mode for not driving a gasoline engine. There is a mode to drive the vehicle, the vehicle is driven by the drive mode set according to the driver's drive mode selection or the automatic drive mode selection according to the vehicle state of the control device.

When the hybrid vehicle is driven in the HEV mode, the generator is driven by the engine driving, the motor is driven according to the power generation voltage output from the generator, and the vehicle is driven and the battery is charged.

Therefore, the state of charge of the battery is changed according to the driving speed of the engine, that is, the engine speed, and the driving speed of the motor is changed, so that the appropriate control must be made so that the engine speed reaches the target speed according to the vehicle driving state.

An object of the present invention is to provide an engine speed control apparatus for a hybrid electric vehicle for controlling the engine speed to reach a target speed in accordance with a vehicle driving state in a hybrid electric vehicle.

Another object of the present invention is to provide an engine speed control apparatus for a hybrid electric vehicle for driving a charging engine according to an engine speed set by a user.

A configuration of the present invention for achieving the above object comprises: power supply means for dividing and supplying power to each device; Signal input means for inputting an engine speed signal and a target speed signal; A control for outputting a corresponding motor driving signal so that the engine speed driven and detected according to the power supplied from the power supply means reaches a target speed, and outputting a display signal for displaying the currently detected engine speed and the target speed; Means; Motor drive means for driving the motor in accordance with the motor drive signal output from the control means; And display means for displaying the engine speed and the target speed detected according to the display signal output from the control means.

1 is a block diagram illustrating a configuration of an engine speed control apparatus for a hybrid electric vehicle according to an exemplary embodiment of the present invention;

2A to 2B are detailed circuit diagrams of an engine speed control apparatus for a hybrid electric vehicle according to an embodiment of the present invention.

3A is a reset timing diagram when a reset switch is operated according to an embodiment of the present invention;

3B is a reset timing diagram at power reset according to the embodiment of the present invention.

By the above configuration, the most preferred embodiment that can be easily carried out by those skilled in the art with reference to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a configuration of an engine speed control apparatus for a hybrid electric vehicle according to an exemplary embodiment of the present invention;

2A to 2B are detailed circuit diagrams of an engine speed control apparatus for a hybrid electric vehicle according to an embodiment of the present invention, and FIG. 3A is a reset timing diagram when a reset switch is operated according to an embodiment of the present invention. Reset timing diagram at the time of power reset according to the embodiment of the present invention.

As shown in FIG. 1, an apparatus for controlling engine speed of a hybrid electric vehicle according to an exemplary embodiment of the present invention includes a power supply unit 10, a switch signal input unit 20 for selecting a plurality of functions, and the power supply unit 10. And a control unit 30 connected to an output terminal of the switch signal input unit 20 and outputting a plurality of control signals according to an applied engine speed signal, a display unit 40 connected to an output terminal of the control unit 30, and a motor driving unit. 50, the clutch drive part 60, the charging part 70, and the reset part 80 which resets the said control part 30 is comprised.

As shown in FIG. 2, the power supply unit 10 according to the embodiment of the present invention includes a first regulator 11 for supplying power to the control unit 30, the motor driving unit 50, and a switch signal input unit. 20, a second regulator 13 for supplying power to each electronic device, and a third regulator 15 for supplying power to the display unit 40.

The regulators 11, 13, and 15 according to the embodiment of the present invention are made of, but not limited to, the LM7805.

The switch signal input unit 20 includes a set up switch S1, a set down switch S2, a set switch S3, an engine speed signal input unit 21, and the switch ( Pull-up resistors R1 to R3 connected to the output terminals of S1 to S3, RC filters R5 to R7, C2 to C4 connected to the output terminals of the switches S1 to S3, and RC filters R5 to R7, respectively. Inverters I2 to I4 connected to the output terminals of C2 to C4, respectively.

The engine speed signal input unit 21 includes RC filters R1 and C1 connected to a signal input terminal output from an engine speed sensor not shown, and an inverter I1 connected to an output terminal of the RC filters R1 and C1. )

The display unit 40 is connected to the display signal output terminal of the control unit 30 and includes a latch unit 41 including a plurality of latches L1 to L4, and a plurality of seven segments connected to an output terminal of the latch unit 41. It consists of the segment part 43 which consists of SE1-SE8.

The latches L1 to L4 according to the exemplary embodiment of the present invention may include, but are not limited to, the SMS 74HC373.

The motor driver 50 may include buffers B1 and B2 connected to the motor driving signal output terminal of the controller 30, pull-up resistors R8 and R9 connected to the buffers B1 and B2, and the base terminal may be connected to the motor driving signal output terminal. A transistor T1 connected to an output terminal of the buffer B1, a relay RL1 connected to one terminal of the motor M and interlocked with the transistor T1, and a base terminal are connected to an output terminal of the buffer B2. The transistor T2 is connected, and the relay RL2 is connected to the transistor T2 and connected to the other terminal of the motor M.

The clutch driver 60 includes a buffer B4 having one terminal connected to the clutch drive signal output terminal of the controller 30, a transistor T4 having a base terminal connected to the output terminal of the buffer B4, and the transistor ( And a relay RL4 interlocked with T4).

The charge driver 70 includes a buffer B3 having one terminal connected to a charge signal output terminal of the controller 30, a transistor T3 having a base terminal connected to an output terminal of the buffer B3, and the transistor T3. It is composed of a relay (RL3) in conjunction with.

The transistors T1 to T4 according to the embodiment of the present invention may be made of, but are not limited to, BDX53C.

The reset unit 80 includes a reset switch S4, a capacitor C5 connected in parallel to the reset switch S4, and an inverter I5 connected to an output terminal of the reset switch S4.

The operation of the engine speed control apparatus of the hybrid electric vehicle according to the embodiment of the present invention by the above configuration is as follows.

When the vehicle is started, power of a battery (not shown) is supplied to the power supply unit 10, and accordingly, the power supply unit 10 is driven to supply a DC voltage required by each electric device.

The first regulator 11 of the power supply unit 10 supplies a 5V power fixed to the control unit 10, the second regulator 13 is the switch signal input unit 20, the motor driver 50 and the clutch driver The power supply 5V fixed to the 60 and the charging unit 70 is supplied, and the third regulator 15 supplies the power supply 5V fixed to the display unit 40.

The use of the three separate regulators 11, 13, and 15 as described above is intended to prevent damage to the constant voltage regulator due to overheating or overcurrent by distributing the current supplied to each device.

As the power is supplied as described above, the reset unit 80 is driven to operate the oscillator.

The reset switch S4 may be operated arbitrarily to perform the reset. As shown in FIG. 3, the reset signal according to the exemplary embodiment of the present invention is held in a high state for at least two periods so that the oscillator is driven and the corresponding clock signal is output to the controller 30.

When the user operates the set switch S3 to drive the engine speed control apparatus while the power is supplied as described above, an enable signal in a high state is output to the controller 30, and the controller 30 is in When the high signal is input to the enable terminal E, the engine speed control operation is started, and the target rotation speed is set according to the operation of the setup switch S1 and the setup switch S2, and the engine operation is controlled accordingly. .

In the present invention, the user operates the setup switch S1 and the setdown switch S2 to set the target rotational speed, but the controller 30 may separately set the target rotational speed.

The signal according to the operation of the setup switch S1, the set down switch S2, and the set switch S3 is input to the high level state by the pull-up resistors R1 to R3, and filtered through the RC filters R5 to R7. Then, the inverter is inverted to a low level state through the inverters I2 to I4 and input to the controller 30.

When the target rotational speed is set as described above, the controller 30 compares the detected actual engine speed with the target rotational speed and drives the motor accordingly.

The engine speed signal output from the engine revolving speed sensor not shown according to the engine driving is filtered by RC filters R1 and C1 of the engine speed signal input unit 21 and then inverted through the inverter I1 to control the engine speed signal. It is output to 30.

The controller 30 outputs a motor drive signal and a clutch drive signal so that the current engine driving state reaches the target speed according to the detected engine speed.

The rotation direction and the rotation speed of the motor are varied by the motor driver 50, and the throttle valve is interlocked with the motor drive by the clutch driver 60.

The control unit 30 outputs the corresponding clutch signal P1 and the motor driving signals P2 and P3 as shown in Table 1 below to control the engine speed to reach the target speed.

TABLE 1

In order to drive the motor, a current of about 2 A must flow at an applied voltage of 12 V. In the present invention, the switch operation of the power transistor is indirectly controlled by using a relay driven at 12 V.

The motor driving signals P2 and P3 output from the controller 30 are passed through the buffers B1 and B2 and then applied to the transistors T1 and T2. When the high state signal is output, the transistor T1 is output. When the T2 is turned on, the relays RL1 and RL2 are turned on so that a voltage of 12 V is supplied to the motor M through the relays RL1 and RL2.

Accordingly, as the motor driving signals P2 and P3 are alternately turned on and off as shown in Table 1, a potential difference occurs at both ends of the motor M, and the motor M rotates in the corresponding direction.

Like the motor driving unit 50, the clutch driving unit 60 also changes the driving state of the transistor T4 according to the clutch driving signal P1 output from the control unit 30, thereby turning on / off the relay RL4. By changing the OFF state, the corresponding signal CLUTCH is output to an engine control device (not shown), and the engine control device controls the opening amount of the throttle valve.

The controller 30 controls the operation of the motor according to the detected engine speed and the target speed as described above, and at this time, displays the detected engine speed and the set target speed through the display unit 40.

The data corresponding to the detected engine speed and the target speed are sequentially outputted four times as a two-digit decimal number.

Data output to the control unit 30 is latched by the latch unit 41, and the latch unit 41 drives the segment unit 43 to display the corresponding data.

Since the data consists of two digits, each latch of the latch unit 41 drives two seven segments to display an upper numeric value and a lower numeric value, thereby driving eight segments to drive the current engine speed. 4 digits of value and 4 digits of target rotation speed are displayed.

When the battery needs to be charged in the driving state as described above, the controller 30 drives the charging unit 30 to output a corresponding charging signal. The charging signal output from the controller 30 is applied to the transistor T3 through the buffer B3, and the relay RL3 is driven according to the operation state of the transistor T3 so that the corresponding charging signal is not shown. Output to the engine control unit. Accordingly, the engine control device drives the engine, and thus the generator is driven to perform the battery charging operation.

As described above, according to the embodiment of the present invention, in the hybrid electric vehicle, it is possible to control the engine speed to reach the target speed in accordance with the vehicle running state.

In addition, another object of the present invention can provide an engine speed control apparatus for a hybrid electric vehicle having the effect of efficiently driving the engine according to the engine speed set by the user for the charging engine.

Claims (9)

Power supply means for dividing and supplying power to each device; Signal input means for inputting an engine speed signal and a target speed signal; A control to output a corresponding motor drive signal so that the engine speed driven and sensed according to the power supplied from the power supply means reaches a target speed, and output a display signal for displaying the currently detected engine speed and the target speed; Means; Motor drive means for driving the motor in accordance with the motor drive signal output from the control means; And a display means for displaying the engine speed and the target speed detected in accordance with the display signal output from the control means. The method of claim 1, wherein the signal input means, A set switch for starting the target rotational speed setting operation, A set-down switch for reducing the target rotation speed, A setup switch for increasing the target rotational speed, A pull-up resistor connected to the output terminals of the switches, RC filters respectively connected to the outputs of the switches; An inverter connected to each output terminal of the RC filter; An engine speed control device for a hybrid electric vehicle comprising an engine speed signal input unit. The method of claim 1, wherein the display means, A segment portion consisting of a plurality of segments indicating an engine speed and a target speed; An engine speed control apparatus for a hybrid electric vehicle, comprising a latch portion consisting of a plurality of latches for latching a display signal output from a control means and thus driving the segment. According to claim 1, wherein the motor drive means, A plurality of buffers having an input of a motor drive signal output from the control means; A pullup resistor connected to the plurality of buffers, A plurality of transistors each having a base terminal connected to an output terminal of the plurality of buffers; And a plurality of relays interlocked with the plurality of transistors and connected to both ends of the motor, respectively. The engine speed control apparatus for a hybrid electric vehicle according to claim 1, further comprising clutch driving means for outputting a corresponding signal such that the throttle valve is linked with the motor driving so that the opening amount is varied. The method of claim 5, wherein the clutch drive means, A buffer connected to the output of the control means; A transistor having a base terminal connected to an output terminal of the buffer; An engine speed control apparatus for a hybrid electric vehicle comprising a relay for outputting a corresponding signal in association with the transistor. 2. An engine speed control apparatus for a hybrid electric vehicle according to claim 1, further comprising charge driving means for outputting a signal for charging a battery. 2. An engine speed control apparatus for a hybrid electric vehicle according to claim 1, further comprising reset means for resetting the control means. The method of claim 8, wherein the reset means, A reset switch; A capacitor connected in parallel with the reset switch; An engine speed control apparatus for a hybrid electric vehicle comprising an inverter connected to an output terminal of the reset switch.