CN1304212C - Series connection type hybrid power system - Google Patents

Abstract

The invention relates to a serial hybrid power system widely applicable to power devices with variable working conditions and variable loads, which belongs to the field of power devices for transportation. This hybrid power system is mainly composed of engine, generator, electric motor, battery, energy recovery device and control system. Since the engine driving device adopts an engine composed of at least two engines, the engine can be engaged or separated, so that the load output by the engine can be adapted to the external load, and the engine can be controlled to operate in a high-efficiency zone, so that the efficiency of the hybrid power system can be further improved.

Description

series hybrid system

technical field

The invention relates to a serial hybrid power system widely applicable to variable working conditions and variable load power devices, which belongs to the field of power devices for transportation.

Background technique

As we all know, in a hybrid power system, there are three modes of power transmission, namely series mode, parallel mode and hybrid mode. The series mode is to use the engine to drive the generator, and the generator drives the motor through the generated electricity, and the motor drives the wheels. In this way, the engine with a small output power can run more stably within the effective range, and the vehicle is still stable. It is possible to drive while efficiently charging the battery. The parallel method is to drive the wheels with the engine and the electric motor. This method can use two kinds of power respectively according to the driving conditions. Toyota's hybrid power system combines the parallel mode and the series mode to better play the respective strengths of the two. The hybrid power system has a dedicated planetary gear. Relatively speaking, the control of the hybrid power system is more complicated.

Contents of the invention

In order to make the vehicle hybrid power system structure more efficient, the invention provides a series hybrid power system, the hybrid power system should adopt a series drive device, and realize comprehensive control by an ECU control unit. The mechanical driving part adopts an engine composed of at least two engines. The entire system is optimally controlled by the ECU control unit, so that the vehicle has good power, economy and emission indicators at the same time.

The technical solution adopted by the present invention to solve the technical problem is: a series hybrid power system, which mainly includes a driving device, which is connected in sequence by an electric motor, a differential, a half shaft and wheels, and is driven by an engine. The generator provides power to the electric motor. It also includes an ECU control unit. The above-mentioned engines have at least two engines connected together by clutches. The high-pressure oil pump, water pump and oil pump are installed on the engine with an output shaft. The high-pressure oil pump is connected to the fuel injector of each cylinder through a high-pressure oil pipe. Each engine and oil pump also have oil supply pipes to connect each engine, and the oil pans of each engine are connected by connecting pipes. The generator, motor, electric energy conversion controller and battery are electrically connected, and the ECU control unit is electrically connected to the engine, speed sensor, vehicle speed sensor, electric energy conversion controller, clutch and electric motor. One method of the above-mentioned engine is to use at least two engines connected in series with a clutch single axis, or divide an engine into at least two cylinder groups, and connect them in series with a clutch on the crankshaft between the cylinder groups; it is also possible to use at least There are two engines connected in parallel using clutch multi-shaft.

The guiding ideology of the above-mentioned technical solution is: this hybrid power system can be combined with several engines, and when the external load changes, a certain engine can be engaged or separated, so that the output load of the engine can adapt to the external load, which can ensure A working engine is always in good performance condition. Therefore, the hybrid power system has a wider high-efficiency range and can fully meet the needs of different working conditions from expressways to urban roads, from full load to no load, etc.

The beneficial effect of the present invention is that the hybrid power system mainly includes a serial driving device. Since the engine is composed of at least two engines, the load output by the engine is adapted to the external load, and the engine is controlled to operate in a high-efficiency zone, so that the efficiency of the hybrid power system is further improved. It not only reduces the pollution to the environment, but also uses energy reasonably and efficiently.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Figure 1 is a schematic diagram of a series hybrid power system in which two engines are connected in series.

Figure 2 is a schematic diagram of a serial hybrid system in which two engines are connected in parallel.

Fig. 3 is a schematic diagram of a single-axis series structure of a 4-cylinder engine and a 2-cylinder engine.

Fig. 4 is a schematic diagram of a 3-cylinder engine and a 3-cylinder engine in parallel with two axes.

In the figure: 1. Foot pedal, 2. ECU control unit, 3. Electric energy conversion controller, 4. Battery, 5. Three-cylinder engine, 6. Two-cylinder engine, 7. Clutch, 8. Four-cylinder engine, 9. Generator, 10, rotational speed sensor, 11, electric motor, 12, axle shaft, 13, differential, 14, vehicle speed sensor, 15, wheel, 16a, driving gear, 16b, intermediate gear, 16c, driven gear, 17, High-pressure oil pump, 18, high-pressure oil pipe, 19, fuel injector, 20, engine oil pump, 21, water pump, 22, connecting pipe.

Detailed ways

In the embodiments shown in FIGS. 1 and 2 , the series hybrid system mainly includes a series drive device. The driving device is sequentially connected together by an electric motor 11 , a differential 13 , a half shaft 12 and wheels 15 , and the engine drives the power generator 9 to the electric motor 11 . The generator 9, the motor 11, the electric energy conversion controller 3 and the battery 4 are electrically connected, and the ECU control unit 2 is also electrically connected to the engine, the rotational speed sensor 10, the vehicle speed sensor 14, the electric energy conversion controller 3, the clutch 7 and the electric motor 11. In FIG. 1 , the engine is connected in uniaxial series by a four-cylinder engine 8 and a two-cylinder engine 6 via a clutch 7 . In Fig. 2, the engine is connected in parallel by two three-cylinder engines 5 via a gear transmission and a clutch 7.

Figure 3 belongs to the single-axis serial structure of two engines. A four-cylinder engine 8 and a two-cylinder engine 6 are engaged or disengaged through a hydraulically driven clutch 7 . High pressure oil pump 17, water pump 21 and machine oil pump 20 are installed on the engine with output shaft, high pressure oil pump 17 is connected with the fuel injector 19 of each cylinder through high pressure oil pipe 18, water pump 21 has water supply pipe to connect two engines, machine oil pump 20 Also have fuel supply pipe to connect two engines, the oil sump of two engines is communicated by connecting pipe 22. This can ensure that the lubricating oil and cooling water of each engine are in the same thermal state. When the engine is working, the microcomputer controller detects the external load, controls the engagement or disengagement of the clutch 7 in real time, and automatically controls whether the engaged or disengaged engine supplies oil, and automatically adjusts the timing of the oil supply. In order to ensure that the engine always works in a good performance area, so that the power, economy and emission indicators of the engine can be optimally matched. This embodiment also can adopt a six-cylinder machine to be divided into two cylinder groups of four cylinders and two cylinders altogether, is provided with clutch on the crankshaft between cylinder groups.

Figure 4 belongs to the dual-axis parallel structure of two engines. Two three-cylinder engines 5 are engaged or disengaged through hydraulically driven clutches 7 . High pressure oil pump 17, water pump 21 and machine oil pump 20 are installed on the engine with output shaft, high pressure oil pump 17 is connected with the fuel injector 19 of each cylinder through high pressure oil pipe 18, water pump 21 has water supply pipe to connect two engines, machine oil pump 20 Also have fuel supply pipe to connect two engines, the oil sump of two engines is communicated by connecting pipe 22. This can ensure that the lubricating oil and cooling water of each engine are in the same thermal state. The double-axis parallel structure also needs to add a group of transmission gears, generally should be made up of driving gear 16a, intermediate gear 16b and driven gear 16c. In order to transmit torque to the output engine when the clutch 7 is engaged.

The operating state of the series hybrid power system mainly depends on the driver to manipulate the pedal 1 to issue instructions:

1. When the vehicle starts and runs under low load, under the control of the ECU control unit 2, the fuel supply to the engine is cut off, the battery 4 supplies power, and the motor drives the wheels to run.

2. When the vehicle is running normally, under the control of the ECU control unit 2:

1. At medium load, one engine works;

2. When the load is heavy, the two engines work.

3. Battery charging. Under the control of the ECU control unit 2, during the running of the vehicle, as long as the battery 4 is insufficient in power, it will be automatically charged.

Four, when the vehicle decelerates or stops running, under the control of the ECU control unit 2, the engine will be stopped.

Claims (2)

1, a kind of series connection type hybrid power system, it mainly comprises an actuating device, actuating device is connected in turn by electrical motor (11), diff (13), semiaxis (12) and wheel (15), and provides power by engine driven generators (9) to electrical motor (11); It also comprises an ECU control unit (2), and above-mentioned driving engine has at least two driving engines to link together by power-transfer clutch (7); High-pressure oil pump (17), water pump (21) and lubricating oil pump (20) are installed on the driving engine that has output shaft, high-pressure oil pump (17) is connected with the fuel injector (19) of each cylinder through high pressure fuel pipe (18), water pump (21) has water supply pipe to connect each driving engine, lubricating oil pump (20) also has fuel feed pipe to connect each driving engine, and the oil pan tray of each driving engine is communicated with by connection pipe (22); Electrical generator (9), electrical motor (11), electric energy change over controller (3) and storage battery (4) adopt and are electrically connected; ECU control unit (2) adopts with driving engine, tachogen (10), car speed sensor (15), electric energy change over controller (3), power-transfer clutch (7) and electrical motor (11) and is electrically connected; It is characterized in that: above-mentioned driving engine is taken to rare two driving engines and uses power-transfer clutch (7) mono-axial to be connected in series, and perhaps a driving engine is divided into two cylinder groups at least, is cascaded with power-transfer clutch on the bent axle between the cylinder group.

2, according to the described series connection type hybrid power system of claim 1, it is characterized in that: above-mentioned driving engine is taken to rare two driving engines and uses power-transfer clutch (7) multiaxis line parallel to connect.

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