JP2018103736A - Drive display device of hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive display device of a hybrid vehicle which can display an engine driving state while preventing a driver from feeling a perception gap.SOLUTION: A drive display device of a hybrid vehicle includes: an engine 2; a motor 33 which is connected with the engine 2 through a belt 27 so as to transmit power thereto; a display part 4 which is provided at an instrument panel etc. and displays a driving state of the engine 2; and an ECU 5 which causes the display part 4 to display a state where the engine 2 is not driven when the engine 2 stops fuel injection and the vehicle is driven by driving force of the motor 33.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drive display device for a hybrid vehicle.

  In Patent Document 1, in a configuration in which an engine and a motor generator are connected via a belt, when there is an acceleration request from a driver, the engine speed is controlled quickly by controlling the torque of the motor generator. It is disclosed to stabilize.

Japanese Patent Laid-Open No. 2006-141379

  Incidentally, in the configuration described in Patent Document 1, when the engine stops fuel injection and the vehicle is driven only by the drive torque of the motor generator, the drive torque of the motor generator is transmitted to the connected engine via the belt. As a result, the engine rotates. For this reason, the engine speed is displayed on the tachometer.

  Although the engine is not a drive source because the fuel is stopped, the engine speed is displayed on the tachometer from the driver's perspective, so it appears that the engine is operating as a drive source. Therefore, there is a problem that a deviation occurs between the actual driving state and the driver's recognition.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a drive display device for a hybrid vehicle that can display the drive state of an engine so as not to cause recognition misalignment to the driver.

  In order to solve the above-described problems, the present invention provides a drive display device for a hybrid vehicle that travels by the driving force of at least one of an internal combustion engine and an electric motor that are connected so as to be capable of transmitting power, and displays the drive state of the internal combustion engine. And a control unit that causes the display unit to display a state in which the internal combustion engine is not driven when the internal combustion engine stops fuel injection and travels with the driving force of the electric motor.

  As described above, according to the present invention, it is possible to display the driving state of the engine so as not to cause a recognition shift in the driver.

FIG. 1 is a block diagram of a main part of a drive display device for a hybrid vehicle according to an embodiment of the present invention. FIG. 2 is a block diagram of a control system of the drive display device of the hybrid vehicle according to one embodiment of the present invention. FIG. 3 is a flowchart showing a procedure of EV travel control processing of the hybrid vehicle drive display device according to the embodiment of the present invention.

  A drive display device for a hybrid vehicle according to an embodiment of the present invention is a drive display device for a hybrid vehicle that travels by the driving force of at least one of an internal combustion engine and an electric motor that are connected so that power can be transmitted. A display unit that displays a driving state; and a control unit that displays a state in which the internal combustion engine is not driven when the internal combustion engine stops fuel injection and travels with the driving force of the electric motor. Has been.

  As a result, the driving state of the engine can be displayed so as not to cause recognition misalignment to the driver.

  Hereinafter, a drive display device for a hybrid vehicle according to an embodiment of the present invention will be described in detail with reference to the drawings.

  In FIG. 1, a vehicle 1 equipped with a drive display device for a hybrid vehicle according to one embodiment of the present invention includes an engine 2 as an internal combustion engine, a power supply system 3, a display unit 4, and an ECU (Electronic as a control unit). Control Unit) 5. The vehicle 1 according to the present embodiment is a vehicle having an idle stop function as will be described later.

  The engine 2 includes a piston, a cylinder, a connecting rod, and the like (not shown), and performs a series of four strokes including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke while the piston reciprocates twice in the cylinder. It is constituted by.

  The piston housed in the cylinder is connected to the crankshaft via a connecting rod. The connecting rod converts the reciprocating motion of the piston into the rotational motion of the crankshaft.

  A transmission 23 is connected to the engine 2. The transmission 23 shifts the rotation of the crankshaft of the engine 2 at a predetermined gear ratio and transmits it to the drive shaft 25 via a differential gear (not shown) to rotate the left and right wheels 26. In FIG. 1, only two wheels 26 are shown, and the remaining two wheels are not shown.

  The power supply system 3 includes a main battery 31 as a first battery, a sub battery 32 as a second battery, a motor 33 as an electric motor, and a switch (SW) circuit 34.

  The main battery 31 is composed of, for example, a lead storage battery. The main battery 31 is electrically connected to the motor 33 via the switch circuit 34. The main battery 31 is provided with a battery state sensor 31a. The battery state sensor 31a detects the charge / discharge current, voltage, and battery temperature of the main battery 31. The battery state sensor 31a is connected to the ECU 5. The ECU 5 can detect the state of charge of the main battery 31 based on the output of the battery state sensor 31a.

  The sub battery 32 is composed of, for example, a lithium ion storage battery. The sub battery 32 is electrically connected to the motor 33 via the switch circuit 34. The sub battery 32 is provided with a battery state sensor 32a. The battery state sensor 32a detects the charge / discharge current, voltage, and battery temperature of the sub battery 32. The battery state sensor 32a is connected to the ECU 5. The ECU 5 can detect the charging state of the sub-battery 32 based on the output of the battery state sensor 32a.

  The switch circuit 34 selects and connects at least one of the main battery 31 and the sub battery 32 as a power source for supplying power to the motor 33. The switch circuit 34 connects the motor 33 to the main battery 31 and the sub battery 32 under the control of the ECU 5.

  The motor 33 is a motor having a function as an alternator that generates power by driving the engine 2 in addition to a function as a starter for starting the engine 2. The motor 33 is driven by electric power supplied from at least one of the main battery 31 and the sub battery 32. The motor 33 is configured to control the output torque according to the torque command signal output from the ECU 5.

  The motor 33 includes a motor pulley (not shown) connected to the rotor shaft of the motor 33. The motor pulley is connected to a crankshaft pulley (not shown) connected to the crankshaft of the engine 2 via a belt 27 so that power can be transmitted.

  The display unit 4 is provided on an instrument panel or the like, and displays the driving state of the engine 2. The display part 4 is comprised by the tachometer provided in the instrument panel which displays an engine speed, for example. The display unit 4 may be an LED (Light Emitting Diode) provided on the instrument panel and an LED drive circuit. The display unit 4 displays the engine speed according to the engine speed signal output from the ECU 5.

  The ECU 5 includes a computer unit that includes a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), a flash memory, an input port, and an output port.

  A program for causing the computer unit to function as the ECU 5 is stored in the ROM of the ECU 5 together with various control constants and various maps. That is, when the CPU executes a program stored in the ROM, the computer unit functions as the ECU 5.

  In addition to the battery state sensor 31a and the battery state sensor 32a described above, various sensors such as an engine speed sensor 51, a vehicle speed sensor 52, and a brake switch 53 are connected to the input port of the ECU 5.

  The engine speed sensor 51 detects the engine speed of the engine 2. The vehicle speed sensor 52 detects the speed of the vehicle 1 from the rotational speed of the wheels 26 and the like.

  The brake switch 53 detects whether or not a brake pedal (not shown) is depressed. The brake switch 53 outputs an on signal when the brake pedal is depressed, and outputs an off signal when the brake pedal is not depressed.

  On the other hand, various control objects such as the engine 2, the display unit 4, the motor generator 33, and the switch circuit 34 are connected to the output port of the ECU 5.

  The ECU 5 can execute idle stop control that automatically stops the engine 2 when a predetermined automatic stop condition is satisfied and restarts the engine 2 when a predetermined restart condition is satisfied. The predetermined automatic stop condition includes, for example, that the vehicle speed is smaller than a predetermined value, that the brake is stepped on, and that the SOC (State Of Charge) of the main battery 31 and the sub battery 32 is larger than a predetermined value. . Further, the predetermined restart condition includes, for example, that an accelerator operation has been performed, that the brake is not stepped on, or the like.

  Further, the ECU 5 restarts the engine 2 when the predetermined restart condition described above is satisfied. The ECU 5 supplies electric power from the main battery 31 to the motor 33 to increase the engine speed, causes the engine speed to reach a predetermined target speed, and restarts the engine 2. Here, the predetermined target rotational speed is, for example, the idle rotational speed of the engine 2. The ECU 5 determines that the restart of the engine 2 has been completed when the engine speed has reached a predetermined target speed. The target engine speed is preferably the engine engine speed when the engine 2 is completely detonated.

  When the aforementioned automatic stop condition is satisfied, the ECU 5 automatically stops the engine 2 in a state where the vehicle speed is smaller than a predetermined value, and performs creep running. When the vehicle speed is larger than a predetermined value and the brake is off during creep traveling, the ECU 5 performs EV traveling that drives the vehicle 1 only by the motor 33 when a predetermined condition is satisfied. During EV travel, power is supplied from the sub battery 32 to the motor 33.

  The EV condition includes, for example, that the SOCs of the main battery 31 and the sub battery 32 are larger than a predetermined value, and that the accelerator opening is equal to or smaller than a predetermined value. Note that the predetermined SOC values of the main battery 31 and the sub battery 32 may be different values for the main battery 31 and the sub battery 32.

  The ECU 5 displays a state in which the engine 2 is not driven on the display unit 4 during the EV traveling in which the engine 2 is stopped.

  Therefore, as shown in FIG. 2, the ECU 5 controls the display unit 4 based on the outputs of the battery state sensor 31 a, the battery state sensor 32 a, the engine speed sensor 51, the vehicle speed sensor 52, and the brake switch 53. .

  For example, during EV traveling, the ECU 5 outputs an engine speed signal with the engine speed “0” to the display unit 4 to display the display of the engine speed on the display unit 4 as “0”. The display unit 4 may display the driving state of the engine 2 as “stopped” or the like when the engine speed signal with the engine speed “0” is received. Moreover, ECU5 may output the signal which shows the drive state of the engine 2 to the display part 4, and the display part 4 may display according to the received drive state.

  The EV traveling control process by the hybrid vehicle drive display device according to the present embodiment configured as described above will be described with reference to FIG. The EV travel control process described below is started when the creep travel state is entered, is executed at a preset time interval, and is terminated when the creep travel is finished.

  In step S1, the ECU 5 determines whether or not the vehicle speed is greater than a predetermined value and the brake is off. If it is determined that the vehicle speed is not greater than the predetermined value or the brake is not turned off, the ECU 5 ends the process. In this case, the vehicle 1 is in a state where it cannot shift to EV traveling.

  If it is determined that the vehicle speed is greater than the predetermined value and the brake is off, in step S2, the ECU 5 determines that the SOC of the main battery 31 is greater than the predetermined value and the SOC of the sub battery 32 is greater than the predetermined value. It is determined whether or not. When it is determined that the SOC of the main battery 31 is not greater than the predetermined value, or the SOC of the sub battery 32 is not greater than the predetermined value, the ECU 5 ends the process. The predetermined SOC values of the main battery 31 and the sub battery 32 may be the same value or different values for the main battery 31 and the sub battery 32. In this case, the SOC of the battery does not satisfy the condition for shifting to EV traveling.

When it is determined that the SOC of the main battery 31 is larger than the predetermined value and the SOC of the sub battery 32 is larger than the predetermined value, the ECU 5 connects the motor 33 to the sub battery 32 in step S3. In this case, since the brake is turned off and the SOC of the battery is in a state that does not interfere with the EV travel, the vehicle 1 connects the motor 33 to the sub battery 32 in order to start the EV travel.
In step S4, the ECU 5 drives the motor 33 to start EV traveling.

  In step S5, the ECU 5 outputs an engine speed signal with the engine speed "0" on the display unit 4 to display the display of the engine speed on the display unit 4 as "0".

  Thus, in the above-described embodiment, when the engine 2 stops the fuel injection and travels with the driving force of the motor 33, the ECU 5 is provided to display the state where the engine 2 is not driven on the display unit 4.

  As a result, the driving state of the engine 2 can be displayed so as not to cause a recognition shift in the driver.

  Further, when the engine 2 is injecting fuel, the ECU 5 causes the display unit 4 to display a state where the engine 2 is being driven.

  As a result, the driving state of the engine 2 can be displayed so as not to cause a recognition shift in the driver.

  The display unit 4 includes a tachometer that displays the engine speed as the driving state of the engine 2.

  Accordingly, the driver can be made to recognize the driving mode without displaying the driving mode of the vehicle 1 specially.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

1 vehicle 2 engine (internal combustion engine)
4 display unit 5 ECU (control unit)
27 Belt 33 Motor (electric motor)

Claims (3)

A drive display device for a hybrid vehicle that travels by the driving force of at least one of an internal combustion engine and an electric motor that are connected so as to be capable of transmitting power,
A display unit for displaying a driving state of the internal combustion engine;
A drive display device for a hybrid vehicle, comprising: a control unit that causes the display unit to display a state where the internal combustion engine is not driven when the internal combustion engine stops fuel injection and travels with the driving force of the electric motor.   2. The drive display device for a hybrid vehicle according to claim 1, wherein when the internal combustion engine is performing fuel injection, the control unit displays a state in which the internal combustion engine is driven on the display unit.   The hybrid vehicle drive display device according to claim 1, wherein the display unit displays a rotation state of the internal combustion engine as a drive state of the internal combustion engine.