JP2013083276A - Power regeneration device mounted in vehicle, and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power regeneration device mounted in a vehicle that can maintain, when regenerating energy as the vehicle is decelerated, a charging state in a charger at a high level while maintaining an electric motor generator at a rotating speed of high power generation efficiency, and to provide a method for controlling the same.SOLUTION: In the power regeneration device 10 mounted in a vehicle including the electric motor generator 11, a charger 12, a converter 13, and a control device 14, a transmission mechanism 11c is provided between an inner input and output shaft 11a and an outer input and output shaft 11b of the electric motor generator 11. A torque is transmitted between the inner input and output shaft 11a and the outer input and output shaft 11b via the transmission mechanism 11c.

Description

  The present invention relates to a vehicle-mounted power regeneration device that can be applied as a motor generator used in an electric vehicle or a hybrid vehicle, and a control method therefor.

  Electric vehicles (EV vehicles) and hybrid vehicles (HV vehicles, HEV vehicles) start and accelerate with the power of the motor (motor), and recover energy with a regenerative brake that uses a generator (generator) during deceleration. ing. These vehicles are equipped with a direct-current regeneration device that consists of a charger (battery), a converter (inverter), a motor generator (motor generator), and a control device (controller). Sometimes electric vehicles start and accelerate with electric motors, hybrid vehicles power assist the output of the internal combustion engine, and when the vehicle decelerates, both electric and hybrid vehicles regenerate energy with generators and switch between them Traveling.

  The energy balance in this case is that the balance between the amount of electric power taken at start-up and acceleration and the amount of regenerative power at the time of deceleration is such that the amount taken out exceeds the amount regenerated unless it is a fairly long downhill. > Regenerative amount ”, and the charging state (SOC: state of charge) of the charger is decreasing. In other words, in general, the amount of electrical energy regenerated during deceleration is smaller than the amount of electrical energy taken out during start-up and acceleration, and the amount of charge in the charger tends to decrease. Therefore, in the hybrid vehicle, the assist amount with respect to the output of the internal combustion engine becomes small.

  In this connection, in the vehicle drive device connected in the order of the engine, the clutch, the automatic transmission, and the electric motor (second motor generator), the rotational speed of the engine becomes a predetermined rotational speed when the electric motor is regenerated. By appropriately controlling the slip state of the clutch and suppressing the rotational resistance of the engine upstream of the clutch compared to when the clutch is fully engaged, it is possible to increase the amount of regeneration of the motor A vehicle drive device that improves fuel consumption has been proposed (see, for example, Patent Document 1).

JP 2007-191018 A

  The present invention has been made in view of the above-described situation. The purpose of the present invention is to maintain a motor generator at a rotational speed with high power generation efficiency during regeneration of energy during deceleration of a vehicle. An object of the present invention is to provide a vehicle-mounted power regeneration device capable of maintaining a state of charge at a high level and a control method therefor.

  In order to achieve the above object, a vehicle-mounted power regeneration device of the present invention is a vehicle-mounted power regeneration device including a motor generator, a charger, a converter, and a control device. A transmission mechanism is provided between the inner input / output shaft and the outer input / output shaft, and the rotational force is transmitted between the inner input / output shaft and the outer input / output shaft via the transmission mechanism.

  According to this configuration, since the speed change mechanism is provided inside the motor generator, the motor generator maintains a high output speed when the vehicle starts and accelerates, and when the vehicle decelerates, the motor generator Can be maintained at a rotational speed with high power generation efficiency, and control for maintaining the state of charge (SOC) at a high level can be performed.

  In other words, depending on the state of charge of the charger, the motor generator can be operated in the region close to the rotation speed with the best regeneration efficiency, and the regenerative energy at the time of deceleration is maximized as the power at the start and acceleration become able to. In particular, in the conventional technology, when focusing on regeneration at a rotational speed at an extremely low speed, the efficiency point of the motor generator will be removed in the high speed range, but such disadvantages can be avoided. .

  Further, in the vehicle-mounted power regeneration device, the control device switches to a gear position that makes the rotational speed of the outer input / output shaft lower than the rotational speed of the inner output shaft when the vehicle starts and accelerates. , The power of the motor generator is output to the drive shaft side of the wheel, and when the vehicle is decelerated, the rotational speed of the inner input / output shaft is switched to a gear position that is lower than the rotational speed of the outer input / output shaft to drive the drive If it is configured to perform control to transmit power input from the shaft side to the motor generator, even at the same vehicle speed, the gear stage is switched at start, acceleration, and deceleration. While reducing the amount of energy released when starting and accelerating, it is possible to increase the amount of energy regenerated when the vehicle decelerates, thereby maintaining the state of charge of the charger well.

  Judgment of acceleration and deceleration can be made based on the accelerator position, and when the vehicle decelerates, the gear stage (gear) increases the rotational speed of the inner input / output shaft of the motor generator more than the rotational speed of the outer input / output shaft. Is selected, and the rotational speed of the inner input / output shaft of the motor generator is made higher than the rotational speed of the inner input / output shaft when the vehicle starts and accelerates.

  Further, in the above-described power regeneration device for mounting on a vehicle, a clutch mechanism is provided between the inner input / output shaft and the outer input / output shaft, and the control device sets the charging state of the charger within a preset range. And when the vehicle is decelerating, the clutch mechanism is disengaged to disconnect the inner input / output shaft from the outer input / output shaft. By controlling the clutch mechanism so as not to cause a rotational speed that causes a current drop due to the above and maintaining the motor generator at a rotational speed with high power generation efficiency, the charging state of the charger can be maintained at a high level.

  In other words, even when the vehicle is decelerating, when energy regeneration is not required, the clutch mechanism is disengaged to separate the inner input / output shaft from the outer input / output shaft, thereby reducing friction caused by dragging. This can reduce the coasting distance and increase the fuel efficiency. That is, it is possible to improve the fuel consumption by protecting the motor generator and the charger and reducing the friction during coasting. In other words, when the regenerative energy in the charging device increases and the state of charge falls within a predetermined range, the speed at the time of deceleration is kept at the same speed (gear) as that at the time of acceleration, Disengage the clutch to reduce friction.

  In addition, by providing a clutch mechanism between the inner input / output shaft and the outer input / output shaft, it is possible to avoid the occurrence of a delay that causes the driver to feel uncomfortable during deceleration to reacceleration, and to further reduce the size of the device itself. In addition to being able to protect the motor generator.

  In order to achieve the above object, a vehicle-mounted power regeneration device control method of the present invention is a vehicle-mounted power regeneration device control method including a motor generator, a charger, a converter, and a control device. A transmission mechanism is provided between the inner input / output shaft and the outer input / output shaft of the motor generator, and rotational force is transmitted between the inner input / output shaft and the outer input / output shaft via the transmission mechanism. When the vehicle starts and accelerates, the rotational speed of the outer input / output shaft is switched to a gear position lower than the rotational speed of the inner output shaft, and the power of the motor generator is output to the drive shaft side of the wheel, When the vehicle decelerates, the rotational speed of the inner input / output shaft is switched to a gear position that is lower than the rotational speed of the outer input / output shaft, and the power input from the drive shaft side is transmitted to the motor generator. It is a characteristic method.

  According to this method, even if the vehicle speed is the same, the shift stage is switched when the vehicle starts and accelerates and when the vehicle decelerates, so that the amount of energy released when the vehicle starts and accelerates is reduced. In addition, the amount of energy regenerated when the vehicle is decelerated can be increased, whereby the state of charge of the charger can be maintained well.

  In the control method of the power regenerative device for mounting on a vehicle, when the charging state of the charger reaches a preset range and the vehicle is decelerating, the inner input / output shaft and By disconnecting the clutch mechanism provided between the outer input / output shafts and disconnecting the inner input / output shafts from the outer input / output shafts, the rotational speed does not cause a current drop due to counter electromotive force. Thus, the clutch mechanism can be controlled to maintain the motor generator at a rotational speed with high power generation efficiency.

  The control of the gear stage of the axle transmission (T / M) is performed so that the torque curve of the motor generator can be operated near the most efficient point, that is, the axle transmission ( (T / M) The gear shift control is performed so that the rotation speed of the motor generator is optimized.

  In addition, the control of the gear stage of the axle transmission (T / M) during regeneration at the time of deceleration basically follows the control of the TCM (transmission control module), but depending on the state of charge, the HCU (hybrid control) Unit) or MCU (motor-control unit) control to interrupt TCM control and give priority to lowering the first gear, reading the driver's brake signal (switch), and lowering the first gear Control such as maintaining.

  According to the vehicle-mounted power regeneration device and the control method thereof according to the present invention, the energy consumed at the time of start and acceleration of the vehicle can be reduced by decelerating the vehicle by switching the rotation speed by a speed change mechanism built in the motor generator. Sometimes it becomes possible to regenerate efficiently, and the state of charge can be maintained in a stable state.

  As a result, in order to maintain the state of charge above the lower limit value, the amount of energy regeneration increases, so that the mileage increases in the case of an electric vehicle (EV vehicle), and in the case of a hybrid vehicle (HV vehicle, HEV vehicle) In addition, the worry of reducing the power assist amount or stopping the power assist, in other words, the concern of receiving the power assist restriction in the low charge state is greatly reduced, and the fuel efficiency can be improved.

It is a figure which shows the structure of the power regeneration apparatus of embodiment which concerns on this invention.

  Hereinafter, a vehicle-mounted power regeneration device and a control method thereof according to the present invention will be described with reference to the drawings. In the following, an electric vehicle (EV vehicle) will be described as an example, but the present invention is not limited to an electric vehicle, and can be applied to all electric vehicles such as a hybrid vehicle (HV vehicle, HEV vehicle).

  As shown in FIG. 1, a vehicle-mounted power regeneration device 10 according to the present invention includes a motor generator 11, a charger (battery) 12, a converter (inverter) 13, and a control device (controller). 14. A transmission (transmission: T / M) 15 is provided.

  In the vehicle-mounted power regeneration device 10, a speed change mechanism 11c is provided between the inner input / output shaft 11a and the outer input / output shaft 11b of the motor generator 11, and the inner input / output shaft 11a and the outer side are provided via the speed change mechanism 11c. A rotational force is transmitted between the input / output shaft 11b. Further, a clutch mechanism 11d is provided between the inner input / output shaft 11a and the outer input / output shaft 11b. For example, the power regeneration device 10 for mounting on a vehicle includes a motor generator with a clutch with a built-in two-speed transmission gear.

  When the motor generator 11 is driven by the electric power supplied from the charger 12 and converted into AC electricity of an appropriate frequency by the converter 13 when the vehicle 1 is started or accelerated, the inner input / output shaft 11a is driven. Is transmitted to the transmission 15 via the clutch mechanism 11d, the transmission mechanism 11c, and the outer input / output shaft 11b. Further, the drive shaft (propeller shaft) 16 and the differential device (differential gear) 17 are transmitted. Then, the rotational force is transmitted to the wheels 19 via the axles (axle shafts) 18 to drive the vehicle.

  On the other hand, when the motor generator 11 regenerates the energy generated by the rotation of the wheels 19 when the vehicle 1 is decelerated, on the contrary, the rotational force of the wheels 19 is changed to the axle 18, the differential device 17, the drive shaft 16, The rotational force is transmitted to the outer input / output shaft 11b via the transmission 15, the inner input / output shaft 11a is driven via the transmission mechanism 11c and the clutch mechanism 11d, and the motor generator 11 generates electric power. The rotational energy is converted into electric energy, and further converted into direct current electricity by the converter 13 to charge the charger 12.

  According to this configuration, the rotational speed with high output efficiency of the motor generator 11 is maintained when the vehicle 1 is started and accelerated, and the motor generator 11 is maintained at a rotational speed with high power generation efficiency when the vehicle 1 is decelerated. Thus, it is possible to perform control for maintaining the state of charge (SOC) of the charger 12 at a high level. Next, a control method in the vehicle-mounted power recovery device 10 will be described. When the vehicle 1 is starting and accelerating, the speed change mechanism 11c is switched to a gear position where the rotational speed of the outer input / output shaft 11b is lower than the rotational speed of the inner output shaft 11a. The speed change mechanism 11c is switched to a gear stage that outputs to the side 16 and the rotational speed of the inner input / output shaft 11a is lower than the rotational speed of the outer input / output shaft 11b when the vehicle 1 decelerates, thereby driving the drive shaft 16 of the motor generator 11 Control to transmit the power input from the side to the motor generator 11 is performed.

  Thereby, even when the vehicle speed is the same, the amount of energy released at the time of starting and accelerating the vehicle 1 is reduced by switching the gear stage of the speed change mechanism 11c at the time of starting and accelerating and decelerating. Moreover, since the amount of energy regeneration at the time of deceleration of the vehicle 1 can be increased, the state of charge (SOC) of the charger 13 can be maintained satisfactorily.

  The determination of acceleration and deceleration can be made based on the accelerator position detected by the accelerator position detection device 20, and when the vehicle 1 is decelerated, the rotational speed of the inner input / output shaft 11a of the motor generator 11 is set to the outer input / output shaft 11b. Is selected, and the rotational speed of the inner input / output shaft 11a of the motor generator 11 is set to be higher than the rotational speed of the inner input / output shaft 11a when the vehicle 1 is started and accelerated. Raise.

  Further, when the charging state of the charger 12 reaches a preset range and the vehicle 1 is decelerating, the clutch mechanism 11d is disconnected (OFF) to turn the inner input / output shaft 11a and the outer input The output shaft 11b is disconnected. That is, when the regenerative energy in the charger 12 increases and the state of charge falls within a predetermined range, the rotational speed at the time of deceleration is kept at the same shift stage (gear) as at the time of acceleration to reduce friction. Disconnect the clutch.

  Thus, the clutch mechanism 11d can be controlled so as not to cause a rotational speed that causes a current drop due to the counter electromotive force, and the motor generator 11 can be maintained at a rotational speed with high power generation efficiency. Thus, even when the vehicle 1 is decelerating, when energy regeneration is not necessary, the clutch mechanism 11d separates the inner input / output shaft 11a from the outer input / output shaft 11b, thereby By protecting the machine 11 and the charger 12 and reducing friction caused by dragging, the coasting distance can be extended and the fuel consumption can be increased.

  According to the power regeneration device for mounting on a vehicle and the control method thereof according to the present invention, when the energy is regenerated during deceleration of the vehicle, the motor generator is maintained at a rotational speed with high power generation efficiency, and the charging rate in the charger is increased. Can be maintained at a high level, so that it can be used as a power regeneration device for mounting on a vehicle such as an electric vehicle (EV vehicle) or a hybrid vehicle (HV vehicle, HEV vehicle) and its control method.

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Power regeneration device 11 for vehicle mounting Motor generator (motor generator)
12 Battery charger
13 Converter (Inverter)
14 Controller (Controller)
15 Transmission (Transmission: T / M)
11a Inner input / output shaft 11b Outer input / output shaft 11c Transmission mechanism 11d Clutch mechanism 16 Drive shaft (propeller shaft)
17 Differential (differential gear)
18 axles (axle shaft)
19 wheel 20 accelerator position detection device

Claims (5)

  In a vehicle-mounted power regeneration device including a motor generator, a charger, a converter, and a control device, a transmission mechanism is provided between an inner input / output shaft and an outer input / output shaft of the motor generator, and the transmission mechanism A power regeneration device for mounting on a vehicle, wherein rotational power is transmitted between the inner input / output shaft and the outer input / output shaft via a shaft.   The control device switches the rotational speed of the outer input / output shaft to a gear position that is lower than the rotational speed of the inner output shaft when starting and accelerating the vehicle, and transmits the power of the motor generator to the drive shaft side of the wheel. When the vehicle is decelerating, the rotational speed of the inner input / output shaft is switched to a gear position that is lower than the rotational speed of the outer input / output shaft, and the power input from the drive shaft side is sent to the motor generator. 2. The vehicle mounted power regeneration device according to claim 1, wherein control for transmission is performed.   When a clutch mechanism is provided between the inner input / output shaft and the outer input / output shaft, and when the charging state of the charger reaches a preset range and the vehicle is decelerating. The power regeneration device for mounting on a vehicle according to claim 1 or 2, wherein the inner input / output shaft and the outer input / output shaft are separated by disconnecting the clutch mechanism.   In a control method of a vehicle-mounted power regeneration device including a motor generator, a charger, a converter, and a control device, a transmission mechanism is provided between an inner input / output shaft and an outer input / output shaft of the motor generator, Rotational force is transmitted between the inner input / output shaft and the outer input / output shaft via the speed change mechanism, and the rotation speed of the outer input / output shaft is adjusted when the vehicle starts and accelerates. The speed of the motor generator is output to the drive shaft side of the wheel, and the rotational speed of the inner input / output shaft is less than the rotational speed of the outer input / output shaft when the vehicle is decelerated. A method for controlling a power regeneration device for mounting on a vehicle, wherein the power input from the drive shaft side is transmitted to the motor generator by switching to a lower gear.   When the charging state of the charger reaches a preset range and the vehicle is decelerating, the clutch mechanism provided between the inner input / output shaft and the outer input / output shaft is disconnected. The method for controlling a power regeneration device for mounting on a vehicle according to claim 4, wherein the inner input / output shaft and the outer input / output shaft are separated from each other.

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