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Hybrid drive system

Nov 12, 2021

The present invention relates to a thermoelectric hybrid drive system, that is, a drive system in which the power used in driving is supplied by at least a heat engine and/or at least an electric motor.

[0002] Background Art

[0003] In the prior art, two types of hybrid drive systems are known: a series hybrid system and a parallel hybrid system.

[0004] In a series hybrid system, an internal combustion engine generates mechanical energy that is supplied to a generator, and the generator generates electrical energy that is partly stored in a battery and partly supplies an electric motor, and the electric motor provides driving for the vehicle. In these systems, the energy required for vehicle drive is thus generated by the heat engine, but the drive is provided by the electric motor.

[0005] The presence of the electric motor during the deceleration and braking phases allows, by operating the electric motor as a generator, part of the kinetic energy of the vehicle will be restored by converting it into electrical energy stored in the battery, which can be used to supply the vehicle Electrical equipment and traction motors.

[0006] In a parallel hybrid system, the driving of the vehicle is simultaneously ensured by the internal combustion engine and the electric motor that both transmit mechanical energy to the wheels. The generator can also be provided in combination with the internal combustion engine to recharge the battery and possibly also the electric motor.

[0007] If, on the one hand, the existence of an electric motor for driving the wheels allows the internal combustion engine to operate under optimal conditions, that is, under conditions of maximum efficiency, on the other hand, it will inevitably suffer an increase in loss, because in addition to the transmission of power to the wheels, it will In addition to the mechanical loss in any vehicle, it also increases the power loss of the electric motor present in the hybrid drive system, which is usually several times larger than the mechanical loss. This is because it is impossible for any type of hybrid system to exclude the electric motor from the drive system by only driving the vehicle with the internal combustion engine, even when the vehicle can be driven by the internal combustion engine at its maximum efficiency operating conditions, that is almost Constant-speed motion conditions, which usually occur on non-urban highways or highway trips.

[0008] Another disadvantage of hybrid drive systems (especially parallel hybrid drive systems) is their considerable overall size, which makes them unsuitable for use in small vehicles.

[0009] US2003/0106729A1 discloses a hybrid drive that includes an internal combustion engine; an engine power output shaft of the internal combustion engine; a transmission power input shaft arranged axially with respect to the engine power output shaft; an engageable clutch with The rotation center line of the engine power output shaft and the transmission power input shaft is coaxially arranged for connecting the two shafts in a torque transmission manner; the first electric motor is arranged coaxially with the rotation center line of the engine power output shaft, which It has a stator and a rotor, and the rotor of the first motor is connected to the power output shaft of the engine in a torque transmission manner; a second motor arranged coaxially with the rotation centerline has a stator and a rotor, and the rotor of the second motor is torque-transmitted Way is connected to the power input shaft of the transmission.

[0010] EP1199204 discloses a propulsion unit for a vehicle, which includes a diesel engine and at least two electric motors; the diesel engine and the at least two electric motors are mechanically connected to one for redistribution/recombination. The equipment of the power transmitted by the diesel engine and transmitted/absorbed by the electric motor, the electric motor can be operated as a generator and an electric motor; the unit is configured such that the electric motor is used in at least one ground speed interval of the traction machine The power portion of the transmitted/absorbed power is zero. [0011] DE19849156 discloses a drive train for a motor vehicle so that bridging occurs when the traction transmitted from the internal combustion engine to the gearbox is interrupted by opening at least one clutch system. In order to achieve such an objective, a device with a motor is used so that the motor is connected to the drive side, specifically the output shaft of the gearbox. When the traction is interrupted by means of at least one clutch system, the traction is transmitted.

[0012] EP1317050 discloses a hybrid powertrain for a vehicle, which includes an internal combustion engine and at least two electric motors, which are mechanically connected to one for distributing/recombining produced by the internal combustion engine and produced by the electric motor /A device that absorbs power so that the electric machine functions as a generator and a motor.

[0013] US5931757 discloses a dual-mode, compound-split electromechanical transmission device, which utilizes an input element for receiving power from an engine and an output element for transmitting power from the transmission device. The first and second motor/generators are operatively connected to the energy storage device through the control device for exchanging electrical energy between the storage device, the first motor/generator and the second motor/generator. The transmission adopts three coaxially aligned planetary gear sub-equipment. Each planetary gear arrangement utilizes first and second gear elements, and each of the first and second gear elements engages a plurality of planetary gears rotatably mounted on the carrier. The first and second motor/generators are coaxially aligned with each other and also coaxially aligned with the three planetary gear sub-devices bounded by the first and second motor/generators. At least one gear element in the first or second planetary gear sub-device is connected to the first motor/generator. The other gear element in the first or second planetary gear arrangement is connected to the second motor/generator. The bracket is operatively connected to the output element. One gear element in the first or second planetary gear sub-device is continuously connected to one gear element in the third planetary gear sub-device. The other gear element in the first or second planetary gear sub-device is operatively connected to the input shaft, and one gear element in the third planetary gear sub-device is selectively connected to the ground.

[0014] Summary of the invention

[0015] An object of the present invention is to provide a hybrid internal thermoelectric drive system that under given conditions enables the vehicle to be driven even with only the internal combustion components (ie, internal combustion engine, excluding electrical components) to drive, in order to avoid electrical The loss of nature to improve the efficiency of the system.

[0016] The second object of the present invention is to provide a hybrid drive system that is more compact and less bulky so that it can be installed on a vehicle of relatively reduced size.

[0017] According to the present invention, a hybrid drive system for vehicle driving is provided, which includes an internal combustion engine, at least one first electric motor and at least one second electric motor, and is mechanically connected to the internal combustion engine and the at least one electric motor. The first transmission device, the second transmission device adapted to be mechanically connected to at least one of the electric motor and the vehicle wheel, and the second transmission device adapted to allow mechanical power to be transmitted to the vehicle wheel only by the internal combustion engine through the first transmission device and the second transmission device The connecting or limiting device is characterized in that the first transmission device includes a drive shaft connectable to the internal combustion engine and the second transmission device includes a hollow driven shaft through which the drive shaft is inserted The shaft so as to be able to rotate freely relative to it, the rotor of the first motor is mounted on the drive shaft and the rotor of the second motor is mounted on the driven shaft.

[0018] Thanks to the present invention, when the movement speed is constant or substantially constant or the movement speed can be changed by adjusting only the operation setting of the internal combustion engine, the vehicle can be driven even only by the internal combustion engine. Drivers are excluded.