JP4362721B2 - Hybrid vehicle - Google Patents

Description

  The present invention relates to a hybrid vehicle that travels by driving a motor with electric power of a traveling battery.

  In hybrid vehicles, the high-voltage direct current power of the battery for driving is converted to 12V DC or 100V AC and supplied to various on-vehicle equipment other than for traveling. These on-vehicle equipment is used to improve the convenience of passengers. It can be used not only inside but also when the vehicle is stopped. In addition, the air conditioner installed in the vehicle has been electrified, and can be used by the electric power from the traveling battery even when the vehicle is stopped along with the electrification.

On the other hand, in a hybrid vehicle, suppression of power consumption of the traveling battery is an important issue, and various countermeasures have been proposed for this purpose (see, for example, Patent Document 1). In the technique disclosed in Patent Document 1, when the vehicle is turning at a low speed continuously for a certain time and the state of charge (SOC) of the running battery is low, the mode is switched to the power saving mode and compared with the normal mode. Thus, the engine travel is controlled to give priority to the engine travel.
JP 2004-112851 A

  By the way, as described above, various on-vehicle equipment and air conditioners can be used even when the vehicle is at a standstill because of considerations aimed at improving the convenience of passengers. Therefore, when using the on-vehicle equipment or the air conditioner by operating the ignition key, traveling equipment such as meters and a navigation system are also activated. Therefore, there is a problem that the power consumption of the traveling battery is promoted by the operation of unnecessary equipment during these stops.

  In addition, the SOC of the running battery gradually decreases due to the operation of the on-vehicle equipment and the air conditioner that are stopped, and when the SOC decreases to a predetermined value or less, the engine is started and the battery is charged by the power generation of the generator. When a large air conditioner or the like is operated, the engine is started and power is generated by the generator with considerable frequency. However, passengers who are parked may be resting or sleeping, so there is a need for quietness in the passenger compartment more than during driving, and frequent engine start-up and power generation may cause discomfort to the passengers. There was a possibility.

And since the technique of the said patent document 1 does not assume the malfunction which generate | occur | produces during such a stop, it could not become a countermeasure of a problem solution.
The present invention has been made to solve such a problem, and an object of the present invention is to reduce the power consumption of the traveling battery when the on-vehicle equipment is used while the vehicle is stopped, and to charge the battery. It is an object of the present invention to provide a hybrid vehicle capable of reducing discomfort to passengers by suppressing noise and vibration associated with engine starting and power generation.

In order to achieve the above object, the invention according to claim 1 is a hybrid vehicle in which a motor is driven by the electric power of the traveling battery to drive the vehicle, and the electric power of the traveling battery is supplied to the in-vehicle equipment to be operable. When the battery for driving needs to be charged, the engine is started and the generator is driven, and the driving mode in which the power generated by the generator is charged into the battery for driving and the cranking speed at the time of starting the engine compared to the driving mode. It performs at least one of suppression or generator power generation suppression, and control means for selectively executing the non-travel mode to slow the rise of the cranking speed at the time of engine start in any of the vehicle Mode selection means for selecting a driving mode while driving and a non-driving mode while stopping, and mode selection Is obtained by a mode switching means for executing the mode selected by the stage control unit.

Therefore, the electric power of the traveling battery is supplied to the in-vehicle equipment by the control means, and when the traveling battery needs to be charged, the engine is started and the electric power generated by the generator is charged to the traveling battery. Then, when the vehicle is stopped and the non-travel mode is selected by the mode selection means, the control means suppresses the cranking speed when the engine is started based on the command from the mode switching means, and the passenger receives when the engine is started. The abrupt feeling is alleviated, or the amount of power generated by the generator is reduced and the noise and vibration during power generation are reduced as the rotation of the engine driving the generator decreases . By slowing down the rise, the noise and vibration increase associated with cranking is moderated, further reducing the sensation experienced by passengers when starting the engine .

According to a second aspect of the present invention, in the first aspect, the mode switching means suppresses the power generation amount of the generator in the non-traveling mode and extends the power generation time per charging cycle.
Accordingly, the frequency of power generation and the frequency of engine start performed prior to power generation are reduced as the power generation time is extended.
According to a third aspect of the present invention, in the first aspect, the mode selecting means determines that the vehicle is stopped when the vehicle stops exceeding a predetermined time, and selects the non-traveling mode instead of the traveling mode. .
Therefore, the situation where the non-driving mode is not used due to factors such as forgetting to perform the selection operation by the driver or the driver not recognizing the non-driving mode itself as in the case where the mode selection is entrusted to the driver is prevented. Is done.

According to the hybrid vehicle of the invention of claim 1 as described above, it is possible to reduce the discomfort to the occupant by suppressing noise and vibration caused by the engine starting and power generation for the battery-charging.

According to the hybrid vehicle of the invention 請 Motomeko 2, in addition to the claim 1, with the extension of the power generation time reduce the frequency of engine starting and power generation, to reduce the discomfort to the occupant with .
According to the hybrid vehicle of the invention of claim 3 , in addition to claim 1, it is possible to prevent a situation in which the non-running mode is not used for some reason.

Hereinafter, an embodiment of a hybrid vehicle embodying the present invention will be described.
As shown in the overall configuration diagram of FIG. 1, the hybrid vehicle of the present embodiment is configured as a parallel hybrid vehicle including an engine 1 and a motor / generator 2 as a driving source for traveling. A rotation shaft 2a of a motor / generator 2 is connected to an output shaft 1a of the engine 1 via a clutch 3, and a belt type continuously variable transmission 4 (hereinafter referred to as CVT) is connected to the rotation shaft 2a of the motor / generator 2. It is connected. The continuously variable transmission 4 is connected to a differential gear 6 via a clutch 5, and the differential gear 6 is connected to drive wheels (rear wheels) 8 via left and right drive shafts 7.

  When the motor / generator 2 is electrically connected to the motor / generator 2 via the inverter 10 and the motor / generator 2 functions as a motor as in motor driving, the inverter 10 causes a DC high voltage from the battery 11 to be generated. Electric power is supplied to the motor / generator 2. On the other hand, when the motor / generator 2 functions as a generator as in deceleration, the electric power obtained by regeneration is charged to the battery 11 via the inverter 10.

  The traveling battery 11 includes a motor 12a of an electric air conditioner 12 mounted on the vehicle, a DC / DC converter 13, a DC / AC inverter 14 (hereinafter, these equipments 12, 13, and 14 are referred to as non-traveling equipment), driving Equipment 15 (hereinafter referred to as traveling equipment) necessary for vehicle travel, such as a seat meter, a navigation system, or an electric power steering, is electrically connected to each other.

  The motor 12a of the air conditioner 12 is supplied with electric power from the traveling battery 10 and drives the air compressor 12b. The DC / DC converter 13 converts direct current high voltage power from the traveling battery 11 into direct current 12V and supplies it to audios (not shown) mounted on the vehicle. The DC / AC inverter 14 converts DC high-voltage power from the traveling battery 11 into AC 100V and then supplies it to an outlet (not shown) installed in the passenger compartment. Operate.

  An SMU (system management unit) 21 including an input / output device, a storage device (ROM, RAM, etc.), a central processing unit (CPU), a timer counter, and the like is installed in the passenger compartment. On the input side of the SMU 21, there are an accelerator sensor 22 for detecting the accelerator operation amount Acc, a vehicle speed sensor 23 for detecting the vehicle speed V, a camp mode switch 24 for selecting a camp mode (non-running mode) performed while the vehicle is stopped, which will be described later, and the like. Various sensors are connected. On the output side of the SMU 21, an ignition plug (not shown), a fuel injection valve, a throttle valve, etc. of the engine 1, an inverter 10 of the motor / generator 2, clutches 3, 5, CVT 8, a starter 25 for cranking the engine, etc. Devices are connected.

  Then, the SMU 21 operates the engine 1 and the motor / generator 2 based on the detection information from the sensors, and controls the CVT 4 to shift the vehicle. During normal traveling, the clutch 3 is disconnected and the clutch 5 is connected, and the electric power of the traveling battery 11 is supplied to the motor / generator 2 via the inverter 10 to perform motor traveling using the motor / generator 2 as a drive source. Prioritize. The SMU 21 at this time controls the torque of the motor / generator 2 based on the accelerator operation amount Acc. Further, when the torque of the motor / generator 2 is insufficient with respect to the accelerator operation amount Acc requested by the driver, the clutch 3 is connected, and the engine 1 and the motor / generator 2 are used together, or the engine 1 alone is used. Run the engine.

The SMU 21 sequentially calculates the SOC of the traveling battery 11 from the integrated value of the discharge current and the charging current of the traveling battery 11 detected by a current sensor (not shown), and based on the calculated SOC, the operating state of the engine 1 and the like. The battery 11 is charged while controlling the power generation amount of the motor / generator 2 (control means).
For example, when the motor travels, every time the SOC falls below a predetermined value, the SMU 21 starts the engine 1 and charges the travel battery 11 by the power generation of the motor / generator 2. Therefore, it is necessary to quickly recover the SOC of the battery 11 in order to cope with such a situation. Therefore, for the start control, the cranking speed is suddenly increased to achieve a quick start, while for the power generation control after the start, the power generation amount of the motor / generator 2 is adjusted to be sufficiently large to achieve rapid battery charging.

  In addition, during traveling, the SMU 21 supplies power from the traveling battery 11 to all electric loads such as the motor 12a of the electric air conditioner 12, the DC / DC converter 13, the DC / AC inverter 14, the traveling equipment 15, and the like. The air conditioner 12 cools and heats the passenger compartment, the audio connected to the DC / DC converter 13 operates, the home appliance connected to the outlet of the DC / AC inverter 14, the travel equipment 15 such as meters and navigation Enables operation of the system and the like. Here, it is assumed that the power generation control, the start control, and the power supply to each electric load during the traveling of the vehicle are performed based on the traveling mode.

  In contrast to the control based on the travel mode, the SMU 21 executes a preset camping mode while the vehicle is stopped. In the camping mode, when the on-vehicle equipments 12 to 15 that supply power from the traveling battery 11 are limited for the purpose of suppressing power consumption of the battery 11 and charging is required as the SOC of the battery 11 decreases, Implement dedicated engine start control and power generation control to reduce noise and vibration associated with power generation. Therefore, the execution status of the camping mode will be described in detail below.

  The SMU 21 executes the mode switching routine shown in FIG. 2 at a predetermined control interval. First, in step S2, the SMU 21 determines whether or not the ignition switch is turned on. If the determination is No (No) during parking, the routine is temporarily executed. finish. If the determination in step S2 is Yes (positive) due to the ON operation of the ignition switch, it is determined in step S4 whether or not the ON operation of the ignition switch has been performed with the camp mode switch 24 being pressed.

  The process in step S4 is for determining whether or not the driver desires to execute the camp mode. When the determination in step S4 is Yes, it is determined that the camp mode is executed and the process proceeds to step S6. . In step S6, it is determined whether or not the vehicle is stopped (vehicle speed V = 0). If the determination is yes while the vehicle is stopped, the routine is terminated after switching to the camp mode in step S8. Then, after switching to the running mode in step S10, the routine is terminated (mode selection means).

  If the determination in step S4 is No, the process proceeds to step S12. In step S12, it is determined whether or not the vehicle is stopped (vehicle speed V = 0). In subsequent step S14, it is determined whether or not a predetermined time T has elapsed from the start of the vehicle stop. When the determination is made, the process proceeds to step S8 to switch to the camping mode, and when any determination is No, the process proceeds to step S10 to switch to the traveling mode (mode selection means).

  Even if the driver does not intend to execute the camp mode, there is no harmful effect if the camp mode is performed when the stoppage is prolonged, while the driver forgets to operate the camp mode switch 24 or Since the mode function itself may not be recognized, the processing of steps S12 and S14 is set so that the merging mode can be obtained even in these situations.

By the above-described processing of the SMU 21, when the camp mode switch 24 is not operated by the driver and when the vehicle is traveling or when the vehicle is stopped for less than a predetermined time T, the vehicle is switched to the traveling mode, and power generation control, start control, Power is supplied to the equipment.
Further, when the camp mode switch 24 is operated by the driver, or when the camp mode switch 24 is not operated, the camp mode is switched to the camp mode when the camp mode switch 24 is not operated, and the power generation control, start control, Power is supplied to each on-board equipment.

  The on-vehicle equipment that receives power supply from the traveling battery 11 is switched according to the mode according to Table 1 (mode switching means).

従って、キャンプモードではメータ類、ナビゲーションシステム、電動パワーステアリング等の走行用装備１５への電力供給が中止されるが、本来停車中には走行用装備を作動させる必要はないことから何ら不具合が発生せず、一方、走行用装備１５の電力消費分だけ走行用バッテリ１１の電力消費を低減することができる。

Therefore, in the camping mode, power supply to the traveling equipment 15 such as meters, navigation system, and electric power steering is stopped, but there is no problem because the traveling equipment does not need to be operated while the vehicle is originally stopped. On the other hand, the power consumption of the traveling battery 11 can be reduced by the amount of power consumed by the traveling equipment 15.

  Further, in the camping mode, the electric power of the traveling battery 11 is gradually consumed with the operation of the electric A / C 12, the operation of audios by the DC / DC converter 13, and the operation of the home appliance by the DC / AC inverter 14. When the SOC of 11 falls below a predetermined value, the engine 1 is started and the running battery 11 is charged by the power generation of the motor / generator 2.

  The starting control at this time is performed in accordance with the time chart shown in FIG. 3, and the cranking speed by the starter 25 is moderated in the camping mode in contrast to the traveling mode in which the cranking speed (that is, the engine speed Ne) is suddenly increased. The engine is started and the engine is started (mode switching means). Here, when the rise of the cranking speed is slowed, the cranking speed is lower in the camping mode than in the traveling mode at the same time (for example, timing a in the figure) from the start of cranking. As a result, it can be said that the camp mode suppresses the cranking speed.

Further, the power generation control by the motor / generator 2 after the start is performed according to the time chart shown in FIG. 4, and in the camping mode, the motor / generator 2 of the motor / generator 2 is controlled with respect to the traveling mode in which the motor / generator 2 is controlled to a sufficiently large power generation amount. The amount of power generation is suppressed (mode switching means).
According to the start control of the camp mode, the rise of the cranking speed is slow, and therefore the time required until the engine complete explosion, in other words, the start time of power generation by the motor / generator 2 is delayed. According to the mode power generation control, since the amount of power generation is small, the time required for the SOC to recover is prolonged, and the recovery of the SOC of the battery 11 is delayed due to these factors. However, power consumption by the electric air conditioner 12 and the like is relatively stable while the vehicle is stopped in the camp mode, and it is necessary to quickly recover the SOC to cope with a sudden increase in power consumption of the motor / generator 2 as during traveling. Since there is not so much property, there is no problem even if the SOC recovery is somewhat delayed as described above.

  And since the rise of the cranking speed at the start of the engine becomes slow, the increase in vibration and noise accompanying the cranking becomes moderate in the camp mode compared to the driving mode, and as a result, the occupant receives at the start of the engine The sudden feeling will be greatly eased. In addition, as shown in the figure, the fact that the fluctuation of the engine speed Ne after the complete explosion is small is also a factor of a sudden feeling.

  Further, as apparent from FIG. 4, the time required for the SOC of the battery 11 to recover due to the suppression of the power generation amount of the motor / generator 2 (that is, the power generation time per charge cycle) is extended. As a result, the frequency of power generation is reduced, and the rotational speed Ne of the engine 1 driving the motor / generator 2 can be reduced by suppressing the amount of power generation, and noise and vibration during power generation are also reduced.

  As described above, the abrupt sensation at the start of the engine is alleviated, noise and vibration at the time of power generation are reduced, and the frequency of the engine start and power generation itself is greatly reduced. When the vehicle is stopped in the mode, it is possible to realize a vehicle interior environment with good quietness, and to suppress noise and vibration associated with engine starting and power generation for battery charging, thereby reducing discomfort to the passengers.

  This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the invention is embodied in a parallel hybrid vehicle including the engine 1 and the motor / generator 2 as the driving source for traveling. However, the type of the vehicle is not limited to this, for example, a motor function and a generator function. Alternatively, the engine may be embodied in a series hybrid vehicle that uses the motor as a driving source for traveling and is used exclusively for power generation.

  Moreover, in the said embodiment, as a measure for suppressing the power consumption of the battery 11 for driving | running | working, the power supply to driving | running | working equipment is stopped at the time of execution of camping mode, and the noise and vibration accompanying engine starting and electric power generation are reduced. As a countermeasure for this, the cranking speed at the start of the engine is gradually increased and the power generation amount of the motor / generator 2 is suppressed. However, it is not always necessary to implement all three kinds of countermeasures, and any one of the countermeasures You may make it implement only.

Further, in the above embodiment, the camp mode is executed when any of the conditions of the operation of the camp mode switch 24 by the driver and the stop of the predetermined time T or more is satisfied, but it is not always necessary to set both conditions. Only one of them may be set as the execution condition of the camping mode.
On the other hand, in the above embodiment, the rising of the cranking speed is slowed in the camping mode, but instead, the upper limit value of the cranking speed after the rising may be suppressed, and in this case as well, the same as in the above embodiment The effect is obtained.

1 is an overall configuration diagram showing a hybrid vehicle of an embodiment. It is a flowchart which shows the mode switching routine which SMU performs. It is a time chart which shows the execution condition of engine starting control. It is a time chart which shows the execution situation of power generation control of a motor / generator.

Explanation of symbols

1 Engine 2 Motor / Generator (Motor, Generator)
11 Battery for traveling 12 Air conditioner (non-running equipment, on-vehicle equipment)
13 DC-DC converter (non-running equipment, in-vehicle equipment)
14 DC-AC inverter (non-running equipment, in-vehicle equipment)
15 Driving equipment (equipment on board)
21 SMU (control means, mode selection means, mode switching means)
24 Camp mode switch

Claims (3)

In a hybrid vehicle in which a vehicle is driven by driving a motor with electric power of a traveling battery,
The electric power of the traveling battery is supplied to the on-vehicle equipment so as to be operable, and when the traveling battery needs to be charged, the engine is started to drive the generator, and the electric power generated by the generator is used for the traveling A driving mode for charging the battery and at least one of suppression of the cranking speed at the time of starting the engine and suppression of the power generation amount of the generator as compared with the driving mode are performed . Control means for selectively executing a non-running mode for slowing down the rising of the ranking speed ;
Mode selection means for selecting the travel mode during travel of the vehicle and for selecting the non-travel mode during stoppage;
A hybrid vehicle comprising: mode switching means for causing the control means to execute a mode selected by the mode selection means.   2. The hybrid vehicle according to claim 1, wherein the mode switching means extends the power generation time per charging cycle by suppressing the power generation amount of the generator in the non-travel mode compared to the travel mode.   2. The hybrid according to claim 1, wherein the mode selection means considers that the vehicle is stopped when the vehicle stops exceeding a predetermined time, and selects the non-travel mode instead of the travel mode. vehicle.

Images