JP2018111366A - vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle issuing a warning to a driver at a proper timing.SOLUTION: When a vehicle is ascending a slope, a controller CTR restricts the output of a motor MOT when the temperature of the motor MOT obtained by a temperature sensor TE reaches a predetermined threshold temperature. Waring issuance means issues a warning when a difference between a torque instruction value of the motor MOT and an actual torque of the motor MOT obtained by a motor torque sensor TS1 is at a predetermined threshold torque or greater and when a vehicle speed obtained by a wheel speed sensor WS is at a predetermined value or smaller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle that limits the output of an electric motor according to the temperature of the electric motor.

  Conventionally, a vehicle that limits the output of an electric motor according to the temperature of the electric motor is known. For example, in the vehicle described in Patent Document 1, it is determined whether the motor is overheated according to the load factor of the motor, and when it is determined that the motor is overheated, information indicating that the motor is overheated is notified in advance. It is described to do.

  In the vehicle described in Patent Document 2, it is described that a warning is issued when it is predicted that there is a possibility of the vehicle going downhill during reverse climbing due to output limitation of the electric motor.

JP 2010-1442029 A JP 2007-185069 A

  The vehicles described in Patent Document 1 and Patent Document 2 employ a method of predicting the vehicle behavior before the vehicle behavior changes and urging the driver to pay attention. However, if a warning is displayed even though the vehicle behavior has not changed, the driver may be confused and the driver may feel annoyed by returning.

  The present invention has been made in view of the above problems, and an object thereof is to provide a vehicle that issues a warning to a driver at an appropriate timing.

In order to achieve the above object, the invention described in claim 1
An electric motor (for example, an electric motor MOT in an embodiment described later) for driving a wheel (for example, a rear wheel Wr in an embodiment described later);
A control device for controlling the output of the electric motor (for example, a control device CTR of an embodiment described later);
Motor temperature acquisition means for acquiring the temperature of the motor (for example, a temperature sensor TE in an embodiment described later);
Motor torque acquisition means for acquiring the actual torque of the motor (for example, a motor torque sensor TS1 in an embodiment described later);
Request torque acquisition means for acquiring the driver's request torque (for example, an accelerator opening sensor AS in an embodiment described later),
Vehicle speed related value acquisition means (for example, a wheel speed sensor WS in an embodiment described later) for acquiring a vehicle speed related value related to the vehicle speed;
A vehicle (e.g., a vehicle 10 according to an embodiment described later) provided with warning generation means (e.g., a warning lamp according to an embodiment described later) that issues a warning to the driver,
In the case where the vehicle is climbing, the control device, when the temperature of the motor acquired by the motor temperature acquisition means reaches a predetermined threshold temperature (for example, a threshold temperature α in an embodiment described later), Limit the output,
The warning generation means is configured such that a difference between a torque instruction value of the motor and an actual torque of the motor acquired by the motor torque acquisition means (for example, a difference ΔTmot in an embodiment described later) is a predetermined threshold torque (for example, described later). A warning is issued when the vehicle speed-related value acquired by the vehicle speed-related value acquisition unit is equal to or greater than a predetermined value (for example, a predetermined value γ in an embodiment described later).

The invention described in claim 2
An engine that drives a first wheel (for example, a front wheel Wf of an embodiment to be described later) of a front wheel (for example, a front wheel Wf of an embodiment to be described later) or a rear wheel (for example, a rear wheel Wr of an embodiment to be described later). (For example, an engine ENG in an embodiment described later),
An electric motor (for example, an electric motor MOT in an embodiment described later) that drives the other second wheel of the front wheel and the rear wheel (for example, a rear wheel Wr in an embodiment described later);
A control device for controlling outputs of the engine and the electric motor (for example, a control device CTR of an embodiment described later);
Motor temperature acquisition means for acquiring the temperature of the motor (for example, a temperature sensor TE in an embodiment described later);
Engine torque acquisition means for acquiring the actual torque of the engine (for example, engine torque sensor TS2 in an embodiment described later);
Motor torque acquisition means for acquiring the actual torque of the motor (for example, a motor torque sensor TS1 in an embodiment described later);
Request torque acquisition means for acquiring the driver's request torque (for example, an accelerator opening sensor AS in an embodiment described later),
Vehicle speed related value acquisition means (for example, a wheel speed sensor WS in an embodiment described later) for acquiring a vehicle speed related value related to the vehicle speed;
A vehicle (e.g., a vehicle 10 according to an embodiment described later) provided with warning generation means (e.g., a warning lamp according to an embodiment described later) that issues a warning to the driver,
In the case where the vehicle is climbing, the control device, when the temperature of the motor acquired by the motor temperature acquisition means reaches a predetermined threshold temperature (for example, a threshold temperature α in an embodiment described later), While limiting the output, increasing the output of the engine to compensate for the decrease in the output of the motor,
The warning generation means includes the total torque obtained by adding the actual torque of the motor acquired by the motor torque acquisition means and the actual torque of the engine acquired by the engine torque acquisition means, and the required torque acquired by the required torque acquisition means. (For example, a difference ΔTsum in an embodiment described later) is equal to or greater than a predetermined threshold torque (for example, a threshold torque β2 in an embodiment described later), and the vehicle speed related value acquired by the vehicle speed related value acquisition unit. Is less than or equal to a predetermined value (for example, a predetermined value γ in an embodiment described later), a warning is issued.

  According to the first aspect of the present invention, the control device can prevent abnormal overheating of the electric motor by limiting the output of the electric motor when the temperature of the electric motor reaches a predetermined threshold temperature. Further, the warning generation means issues a warning when the difference between the torque instruction value of the motor and the actual torque of the motor is not less than a predetermined threshold torque and the vehicle speed related value is not more than the predetermined value. You will receive a warning when you feel a change in behavior. Therefore, it is possible to eliminate the annoyance of receiving a warning when there is no change in the vehicle behavior.

  According to the invention described in claim 2, the control device limits the output of the motor when the temperature of the motor reaches a predetermined threshold temperature, and increases the output of the engine so as to compensate for the decrease in the output of the motor. Thus, the required torque can be satisfied while protecting the electric motor.

  However, if the driver's required torque cannot be satisfied even if the engine output is increased when the vehicle is climbing up, that is, the difference between the required torque and the total vehicle torque is greater than or equal to a predetermined threshold torque, and the vehicle speed related value is Since the warning generation means issues a warning when the value is less than or equal to the predetermined value, the driver receives a warning when he / she feels a change in the vehicle behavior. Therefore, it is possible to eliminate the annoyance of receiving a warning when there is no change in the vehicle behavior.

1 is a schematic configuration diagram illustrating a schematic configuration of a vehicle according to an embodiment of the present invention. It is a timing chart of warning generation control of a 1st embodiment. It is a timing chart in case a warning display lights in warning generation control of 2nd Embodiment. It is a timing chart in case a warning display does not light in warning generation control of a 2nd embodiment.

Hereinafter, an embodiment of a vehicle according to the present invention will be described with reference to the drawings.
The vehicle 10 of this embodiment includes a front wheel drive device 11 and a rear wheel drive device 12 that are mechanically independent. “Mechanically independent” means that one power is not mechanically transmitted to the other by a propeller shaft or the like.

  The front wheel drive device 11 includes an engine ENG that generates power for driving the front wheels Wf, and a first transmission TM1 provided on a power transmission path between the engine ENG and the front wheels Wf. The first transmission TM1 may be a manual transmission (MT) or an automatic transmission (AT). Examples of the automatic transmission (AT) include CVT (Continuously Variable Transmission), DCT (Dual-clutch transmission), AMT (Automatic manual transmission), and torque converter step AT.

  The rear wheel drive device 12 includes an electric motor MOT that generates power for driving the rear wheels Wr, and a second transmission TM2 provided on a power transmission path between the engine ENG and the rear wheels Wr. Similarly to the first transmission TM1, the second transmission TM2 may be a manual transmission (MT) or an automatic transmission (AT).

  The first transmission TM1 and the second transmission TM2 are not necessarily required, and the engine ENG and the front wheel Wf may be directly connected or connected via a differential device, and the motor MOT and the rear wheel Wr are directly connected. Alternatively, they may be connected via a differential device.

  The electric motor MOT is provided with a temperature sensor TE that acquires the temperature of the electric motor MOT and a motor torque sensor TS1 that acquires the actual torque of the electric motor MOT. “Acquisition” in the temperature sensor TE, the motor torque sensor TS1, and other sensors described later is a concept including detection, calculation, estimation, and the like. For example, the actual torque of the motor MOT is a rotation in the second transmission TM2. It may be calculated from the body torque.

  In addition to the temperature sensor TE and the motor torque sensor TS1, the vehicle 10 acquires a wheel speed sensor WS that detects a wheel speed, a motor rotation speed sensor RS that detects the rotation speed of the motor MOT, and an actual torque of the engine ENG. Sensors such as an engine torque sensor TS2, an accelerator opening sensor AS that detects the accelerator opening of the accelerator pedal AP, a warning lamp (not shown) that issues a warning for the purpose of alerting the driver, and the like are provided. The warning lamp is provided on, for example, an instrument panel.

  In FIG. 1, symbol CTR is a control device that controls the entire vehicle, and performs output control of the engine ENG and the electric motor MOT. The controller CTR detects the temperature of the motor MOT acquired by the temperature sensor TE, the actual torque of the motor MOT acquired by the motor torque sensor TS1, the actual torque of the engine ENG acquired by the engine torque sensor TS2, and the wheel speed sensor WS. The wheel speed, the rotation speed of the motor MOT detected by the motor rotation speed sensor RS, the opening degree of the accelerator pedal AP detected by the accelerator opening degree sensor AS, and the like are input.

  The controller CTR performs motor power save control that limits the output of the motor MOT when the temperature of the motor MOT reaches a predetermined threshold temperature α in order to prevent abnormal overheating of the motor MOT. During the motor power save control, the output of the motor MOT is limited, so that a situation may occur where the actual torque of the motor MOT is insufficient with respect to the driver's required torque. In particular, the motor MOT tends to generate heat when the vehicle is climbing at the rear wheel drive by the rear wheel drive device 12 and at an extremely low vehicle speed (for example, 10 km / h or less), and the actual torque of the motor MOT is controlled by the motor power save control. If there is not enough, the vehicle 10 may stop against the driver's intention.

  Therefore, it is necessary to urge the driver to turn on the warning lamp in advance, but if the warning is displayed even though the vehicle behavior has not changed, the driver will be confused and will return. There was a risk of annoying warnings. Therefore, in the present invention, a warning is displayed at the timing described in the following embodiments. Note that the warning display control in each of the following embodiments is an example in the case where the vehicle is climbing up at a rear wheel drive by the rear wheel drive device 12 and at an extremely low vehicle speed.

[First Embodiment]
First, warning display control of the first embodiment will be described with reference to FIG. FIG. 2 is a timing chart of warning generation control according to the first embodiment.

  First, when the driver depresses the accelerator pedal AP with a constant depression force, the vehicle 10 climbs at a constant vehicle speed until the temperature of the electric motor MOT (MOT temperature) reaches the threshold temperature α. When the temperature of the motor MOT reaches a predetermined threshold temperature α, the power save flag is turned on and the control device CTR limits the output of the motor MOT (power save control). Therefore, the vehicle speed of the vehicle 10 starts to gradually decrease (time t1) and eventually stops (time t2).

  On the other hand, the driver depresses the accelerator pedal AP with a greater pedaling force, but after the motor MOT reaches the threshold temperature α once, the control device CTR continues to limit the output of the motor MOT when the power save flag is ON. Therefore, the difference ΔTmot between the torque instruction value of the electric motor MOT calculated according to the opening of the accelerator pedal AP and the actual torque of the electric motor MOT increases, and eventually reaches a predetermined threshold torque β1 (time t3). If the difference ΔTmot between the torque instruction value of the electric motor MOT and the actual torque of the electric motor MOT reaches the threshold torque β1 with the vehicle 10 stopped in this manner, the warning lamp (warning display) is turned on.

  That is, in the warning display control of the first embodiment, when the vehicle 10 is climbing up, the control device CTR restricts the output of the motor MOT when the temperature of the motor MOT reaches a predetermined threshold temperature α, and the warning lamp Issues a warning when the difference ΔTmot between the torque instruction value of the motor MOT and the actual torque of the motor MOT is equal to or greater than the threshold torque β1 and the vehicle 10 is stopped. The wheel speed is not limited to the case where the vehicle 10 is stopped, and the wheel speed may be a predetermined value γ (for example, 1 km / h) or less. Further, instead of the wheel speed detected by the wheel speed sensor WS, the rotation speed of the motor MOT detected by the motor rotation speed sensor RS may be used as a reference, and a differential value of the wheel speed or the rotation speed of the motor MOT may be used as a reference. Alternatively, other vehicle speed related values may be used as a reference.

  As described above, according to the warning display control of the first embodiment, a warning is issued only when the motor MOT reaches the threshold temperature α as in the prior art, or a warning is issued only when the power save flag is ON. The driver will receive a warning when he / she feels a change in the vehicle behavior, more specifically when the vehicle 10 stops or clearly decelerates against the driver's will. Therefore, it is possible to eliminate the annoyance of receiving a warning when there is no change in the vehicle behavior.

[Second Embodiment]
Next, warning display control of the second embodiment will be described with reference to FIGS. FIG. 3 is a timing chart when the warning display is turned on in the warning generation control of the second embodiment, and FIG. 4 is a timing chart when the warning display is not turned on in the warning generation control of the second embodiment.

  First, when the driver depresses the accelerator pedal AP with a constant depression force, the vehicle 10 climbs at a constant vehicle speed until the temperature of the electric motor MOT (MOT temperature) reaches the threshold temperature α. When the temperature of the motor MOT reaches a predetermined threshold temperature α, the power save flag is turned on and the control device CTR limits the output of the motor MOT (power save control). Therefore, the vehicle speed of the vehicle 10 starts to gradually decrease (time t1) and eventually stops (time t2).

  On the other hand, the driver depresses the accelerator pedal AP with a greater pedaling force, but after the motor MOT reaches the threshold temperature α once, the control device CTR continues to limit the output of the motor MOT when the power save flag is ON. Therefore, the difference ΔTmot between the torque instruction value of the electric motor MOT calculated according to the opening of the accelerator pedal AP and the actual torque of the electric motor MOT increases.

  On the other hand, the control device CTR increases the output of the engine ENG in conjunction with the opening of the accelerator pedal AP so as to compensate for the decrease in the output of the electric motor MOT in the ON state of the power save flag. That is, the control device CTR controls the engine ENG so that the torque ΔTeng is output from the engine ENG of the front wheel drive device 11 in conjunction with the amount of depression of the accelerator pedal AP by the driver. Note that the torque ΔTeng is smaller than the difference ΔTmot between the torque instruction value of the motor MOT and the actual torque of the motor MOT.

  When the engine ENG of the front wheel drive 11 cannot output this torque ΔTeng, as shown in FIG. 3, the difference ΔTsum between the total vehicle torque obtained by adding the actual torque of the motor MOT and the actual torque of the engine ENG and the driver required torque Increases until a predetermined threshold torque β2 is reached (time t3). When the vehicle 10 stops and the difference ΔTsum between the total vehicle torque and the driver request torque reaches the threshold torque β2, the warning lamp is turned on.

  That is, in the warning display control of the second embodiment, when the vehicle 10 is climbing up, the control device CTR limits the output of the motor MOT when the temperature of the motor MOT reaches a predetermined threshold temperature α, and The engine ENG output is increased to compensate for the decrease in the MOT output. The warning lamp warns when the difference ΔTsum between the total vehicle torque obtained by adding the actual torque of the motor MOT and the actual torque of the engine ENG and the driver required torque is equal to or greater than the threshold torque β2 and the vehicle 10 is stopped. To emit. The wheel speed is not limited to the case where the vehicle 10 is stopped, and the wheel speed may be a predetermined value γ (for example, 1 km / h) or less. Further, instead of the wheel speed detected by the wheel speed sensor WS, the rotation speed of the motor MOT detected by the motor rotation speed sensor RS may be used as a reference, and a differential value of the wheel speed or the rotation speed of the motor MOT may be used as a reference. Alternatively, other vehicle speed related values may be used as a reference.

  As described above, according to the warning display control of the second embodiment, a warning is issued only when the motor MOT reaches the threshold temperature α as in the prior art, or a warning is issued only when the power save flag is ON. The driver will receive a warning when he / she feels a change in the vehicle behavior, more specifically when the vehicle 10 stops or clearly decelerates against the driver's will. Therefore, it is possible to eliminate the annoyance of receiving a warning when there is no change in the vehicle behavior.

  On the other hand, when the engine ENG of the front-wheel drive device 11 can output this torque ΔTeng, as shown in FIG. 4, the vehicle 10 once stops (time t2) and immediately returns to extremely low vehicle speed travel (time t3). . That is, although the total vehicle torque obtained by adding the actual torque of the motor MOT and the actual torque of the engine ENG is less than the driver required torque, the vehicle 10 can be driven by the output of the engine ENG. In this case, the warning lamp has a difference ΔTsum between the total vehicle torque obtained by adding the actual torque of the electric motor MOT and the actual torque of the engine ENG and the driver required torque less than the threshold torque β2, and the vehicle 10 is not stopped. Do not issue a warning. Thereby, although the vehicle 10 is not stopped, the troublesomeness of receiving a warning can be eliminated.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In the above embodiment, the front wheel drive device 11 includes the engine ENG and the rear wheel drive device 12 includes the electric motor MOT. However, the front wheel drive device 11 includes the electric motor MOT, and the rear wheel drive device 12 operates the engine ENG. It may be provided.
Further, although the warning lamp is exemplified as the warning generating means, a warning sound generating device, a vibration generating device, or the like may be provided instead of the warning lamp or together with the warning lamp.

10 vehicle AS accelerator opening sensor (required torque acquisition means)
CTR control device ENG engine MOT motor TE temperature sensor (motor temperature acquisition means)
TS1 motor torque sensor (motor torque acquisition means)
TS2 engine torque sensor (engine torque acquisition means)
WS Wheel speed sensor (vehicle speed related value acquisition means)
Wf Front wheel (first wheel)
Wr Rear wheel (second wheel)
α Threshold temperature β1 Threshold torque β2 Threshold torque γ Predetermined value ΔTmot Difference between torque indication value and actual torque ΔTsum Difference between total torque and required torque

Claims (2)

An electric motor that drives the wheels of the vehicle;
A control device for controlling the output of the electric motor;
Motor temperature acquisition means for acquiring the temperature of the motor;
Motor torque acquisition means for acquiring the actual torque of the motor;
Request torque acquisition means for acquiring the driver's request torque;
Vehicle speed related value acquisition means for acquiring a vehicle speed related value related to the vehicle speed;
A vehicle having warning generation means for issuing a warning to a driver,
When climbing the vehicle, the control device limits the output of the electric motor when the temperature of the electric motor acquired by the electric motor temperature acquisition means reaches a predetermined threshold temperature,
The warning generation means has a difference between a torque instruction value of the electric motor and an actual torque of the electric motor acquired by the electric motor torque acquisition means equal to or greater than a predetermined threshold torque, and the vehicle speed related value acquisition means acquires the A vehicle that issues a warning when a vehicle speed related value is a predetermined value or less. An engine that drives the first wheel of any one of the front and rear wheels of the vehicle;
An electric motor for driving the other second wheel of the front wheel and the rear wheel;
A control device for controlling outputs of the engine and the electric motor;
Motor temperature acquisition means for acquiring the temperature of the motor;
Engine torque acquisition means for acquiring the actual torque of the engine;
Motor torque acquisition means for acquiring the actual torque of the motor;
Request torque acquisition means for acquiring the driver's request torque;
Vehicle speed related value acquisition means for acquiring a vehicle speed related value related to the vehicle speed;
A vehicle having warning generation means for issuing a warning to a driver,
When the vehicle is climbing, the control device limits the output of the motor and decreases the output of the motor when the temperature of the motor acquired by the motor temperature acquisition means reaches a predetermined threshold temperature. Increase the engine power to make up for the minute,
The warning generation means includes the total torque obtained by adding the actual torque of the motor acquired by the motor torque acquisition means and the actual torque of the engine acquired by the engine torque acquisition means, and the required torque acquired by the required torque acquisition means. A vehicle that issues a warning when the difference between the vehicle speed and the vehicle speed related value acquired by the vehicle speed related value acquisition means is equal to or less than a predetermined value.

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