SK72018U1 - Circuit for alternating power transmission of a hybrid electric vehicle - Google Patents

Abstract

The connection for alternating power transmission of a hybrid electric vehicle consists of an internal combustion engine (1) whose shaft is resiliently coupled to the shaft of an electric generator (2) to which an AC traction converter (3) and an auxiliary traction converter (6) are connected via power wires. , wherein the auxiliary traction converter (6) is connected to the traction barrier (7) by means of power conductors. The left traction electric motor (4) and the right traction electric motor (5) are connected in parallel to the AC traction converter (3) by means of power conductors. The control system (8) is connected to the combustion engine (1), the electric generator (2), the AC traction converter (3), the left traction electric motor (4), the right traction electric motor (5), the auxiliary traction converter (6) by means of signal wires. and traction battery (7).

Description

The object of the technical solution is a circuit for alternating power transmission of a hybrid electric vehicle. The technical solution concerns the problems of hybrid electric vehicles, ie the field of automotive technology, electrical engineering and power electronics.

BACKGROUND OF THE INVENTION

In principle, hybrid electric vehicles (HEVs) work with either serial or parallel transmission of traction power. In HEVs with parallel transmission of traction power, both the internal combustion engine and the electric motor operate simultaneously (in parallel) and their power is added together in the mechanical transmission of the drive axle. Most hybrid electric vehicles use a serial power transmission and AC / DC / AC power-to-ground power supply system with rectifier, DC link and voltage inverters with one central electric motor and mechanical differential transmission to drive the traction motor. This electrical part of the transmission is powered by a generator driven combustion engine The generator also serves as a starting electric motor for an internal combustion engine. HEV vehicles with electric motor wheels can work with a mechanical or electric differential and power distribution. The electric motors of the drive wheels are supplied from separate inverters, which ensure the electric power distribution for the electric motors. The disadvantage of such a series HEV vehicle with an electric AC / DC / AC converter transmission is the need for a traction rectifier in this transmission chain and the associated voltage drops and its power losses, which adversely affects the overall energy efficiency of the vehicle HEV transmission. The disadvantage of HEV vehicles with electric differential is the need to use two separate converters.

The essence of the technical solution

The wiring for the alternating power transmission of a hybrid electric vehicle consists of three parts. The first part consists of an internal combustion engine that powers the electric generator and thus creates a power supply network that supplies power to the rest of the hybrid electric vehicle. A parallel traction converter is connected in parallel to this supply network, which supplies the traction battery with energy if necessary, or in the case of an excess of energy in this supply network, supplies it with the traction battery. The second part consists of an alternating traction converter, which generates the required voltages for parallel connected traction motors - left and right. The traction motors used must be more than three-phase. In the event of recovery (vehicle braking, downhill driving), the AC traction converter delivers the energy from the traction motors back to the mains; and subsequently accumulates in the traction battery by means of an auxiliary traction converter or brakes (relieves) the internal combustion engine. The last part consists of a control system whose task is to read the parameters of electric generator, AC traction converter, left and right traction motor, auxiliary traction converter and traction battery and to control internal combustion engine, ac traction converter and auxiliary traction converter.

Connecting to the AC power of a hybrid electric vehicle brings many benefits, such as:

• implemented electronic differential - the absence of a mechanical differential increases the efficiency of mechanical energy transfer and reduces the possibility of mechanical failure;

• direct transmission of AC power without changing it to DC in the rectifier, which also increases the efficiency of the whole system;

• parallel operation of the electric generator and traction battery, allowing the system to operate in a variety of separate operating modes;

• parallel connection of traction motors - only one traction converter is required.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 shows a block circuit for alternating power transmission of a hybrid electric vehicle.

EXAMPLES

The alternating power transmission circuit of the hybrid electric vehicle of FIG. 1 consists of an internal combustion engine 1 and an electric generator 2 which are resiliently connected via shafts. The AC traction converter 3 and the auxiliary traction converter 6 are connected in parallel to power generators by means of power conductors.

SK 7-2018 U1

2. The traction battery 7 is connected to the auxiliary traction converter 6 by means of power wires. The left traction motor 4 and the right traction motor 5 are connected in parallel to the traction converter 3 via power wires. The control system 8 is connected to the internal combustion engine 1 by signal wires. the electric generator 2, the alternating traction converter 3, the left traction motor 4, the right traction motor 5, the auxiliary traction converter 6 and the traction battery 7, and controls the internal combustion engine 1, the alternating traction converter 3 and the auxiliary traction converter 6.

Industrial usability

The wiring of the AC power of a hybrid electric vehicle can be used in all common vehicles - cars. This connection can also be used in diesel-electric locomotives, trucks, handling machines, etc.

N E 7-2018 U1

List of reference marks

- Combustion engine

- electric generator

3 - AC traction converter

- left traction electric motor

- Right traction electric motor

- Auxiliary traction converter

- traction battery

8 - control system

Claims (1)

PROTECTION REQUIREMENTS Circuit for alternating power transmission of a hybrid electric vehicle consisting of an internal combustion engine (1), an electric generator (2), an ac traction converter (3), a left traction electric motor 5 (4), a right traction electric motor (5), an auxiliary traction converter (6) , the traction battery (7) and the control system (8), characterized in that the internal combustion engine shaft (1) is resiliently connected to the shaft of the electric generator (2), to which an AC traction converter (3) is connected in parallel via power conductors; an auxiliary traction converter (6), wherein the auxiliary traction converter (6) is connected to the traction battery (7) by means of power conductors, the left traction motor (4) and the right traction motor (5) 10 are connected in parallel to the AC traction converter (3), the control system (8) is connected to the internal combustion engine (1), the electric generator (2) by means of signal wires , an alternating-current traction converter (3), a left-hand traction motor (4), a right-hand traction motor (5), an auxiliary traction converter (6) and a traction battery (7).