CN103569104B - Use the charge control method of the HEV powered rotation system of few Cylinder engine - Google Patents

Abstract

The present invention relates to a charge control method of an HEV power rotation system using an engine with few cylinders. The HEV includes an engine, a generator, an electric motor and a high-energy battery; cycle engine; characterized in that: when the engine speed is between a predetermined idling speed and the normal charging start speed, the generator includes a periodic charging process, and the periodic charging process means that the generator only starts from the working cycle The high energy battery is charged during the continuous period up to the exhaust cycle. Adopting the charging control method of the present invention can greatly improve the smoothness of engine rotation, thereby significantly reducing the vibration and noise produced by the HEV hybrid vehicle.

Description

Charging control method for HEV power rotation system using less-cylinder engine

technical field

The invention belongs to the technical field of HEV charging control, and more specifically, the invention relates to a charging control method of an HEV power rotation system using a less-cylinder engine.

Background technique

In recent years, in large and medium-sized cities in my country, due to the extensive use and rapid popularization of automobiles, the problems of energy shortage and environmental pollution have become increasingly serious. In particular, in recent years, the seriousness of the air pollution situation has threatened the health and daily activities of the people. For this reason, governments at all levels in our country have planned to invest huge sums of money in the control of air pollution, especially smog pollution. One of the important measures is to vigorously promote the development of new energy vehicles, especially HEV hybrid vehicles with energy saving, environmental protection, convenience and practicality.

HEV hybrid power means that the car uses gasoline drive and electric drive. The advantage is that when the vehicle starts and stops, it is only driven by the generator, and the engine does not work if it does not reach a certain speed. The best working condition, good power, low emissions, and the source of electric energy is the engine, only need to refuel.

The key of the HEV hybrid electric vehicle is the hybrid power system, and its performance is directly related to the overall performance of the hybrid electric vehicle. After more than ten years of development, the hybrid powertrain assembly has developed from the original discrete structure of the engine and motor to the integrated structure of the engine, motor and gearbox, that is, the integrated hybrid powertrain system.

Accompanying drawing 1 shows the relationship between the engine speed and the charging period when the conventional charging method in the prior art is adopted. With the above-mentioned charging method, when the generator is used to generate electricity, because the torque characteristics of the engine and the motor do not match, even if the amount of power generation is controlled only by relying on the general load state, the smoothness of the engine rotation cannot be greatly improved, resulting in HEV hybrid vehicles generate greater vibration and noise.

Contents of the invention

In order to solve the above-mentioned technical problems in the prior art, the object of the present invention is to provide a charging control method for a power rotation system of an HEV using a less-cylinder engine.

The charging control method of the HEV power rotation system using a few-cylinder engine according to the present invention, the HEV includes an engine, a generator, an electric motor and a high-energy battery; cyclic engine; characterized in that, when the engine speed is between a predetermined idling speed (NeID) and a normal charging start speed (NeCH), the generator includes a periodic charging process, which means generating The engine only charges the high-energy battery during the continuous period from the duty cycle to the exhaust cycle.

Wherein, when the engine speed is lower than a predetermined idling speed, the generator does not charge the high-energy battery.

Wherein, when the rotational speed of the engine is higher than the normal charging start rotational speed, the generator is charged in all four working cycles.

Wherein, when the engine speed is between the predetermined idling speed (NeID) and the normal charging start speed (NeCH), when the engine speed gradually increases, the time for the generator to charge the high-energy battery during the exhaust cycle also gradually becomes longer.

Compared with the prior art, the charging control method of the present invention has the following beneficial effects: the smoothness of engine rotation can be greatly improved by using the charging control method of the present invention, thereby significantly reducing the vibration and noise generated by the HEV hybrid electric vehicle.

Description of drawings

FIG. 1 is a graph showing the relationship between the engine speed and the charging period in the conventional charging method in the prior art.

FIG. 2 is a schematic structural view of the HEV power rotation system described in Embodiment 1. FIG.

FIG. 3 is a graph showing the relationship between the engine speed and the charging period in the charging control method described in Embodiment 1. FIG.

detailed description

The structure and functions of the charging control method of the HEV power rotation system according to the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 2, the HEV power rotation system HEV described in this embodiment includes an engine 10, a generator 20, a motor 30, a high-energy battery 40, a power generation controller 50, a power controller 60, an engine ECU 70, a power management ECU 80 and Power management ECU90; the generator 20 is connected to the power generation controller 50 through a three-phase line, and the power controller 60 is connected to the motor 30 through a three-phase line; the engine ECU70, power management ECU80 and power management ECU90 can The bus transmits information interactively; and the engine is an engine including four working cycles of intake, compression, power and exhaust; in this embodiment, the engine is a single-cylinder or double-cylinder engine.

Wherein, accompanying drawing 3 shows the charging control scheme of this embodiment when the engine is a double cylinder. In Fig. 3, the abscissa is the crank angle, and the ordinate is the engine speed. As shown on the horizontal axis, it shows four working cycles repeated at intervals of 180deg starting from the apex, where for the first cylinder, it is the intake stroke, compression stroke, power stroke and exhaust stroke; for the second cylinder , followed by power stroke, exhaust stroke, intake stroke and compression stroke; wherein the first cylinder and the second cylinder are separated by two strokes. The charging period displayed corresponding to the scale of the crank angle is the charging process of the generator to the high-energy battery, and the charging process is different according to the magnitude of the engine speed Ne. When the engine speed is lower than the predetermined idling speed NeID, the generator does not charge the high-energy battery, corresponding to the blank part in the figure when the engine speed is lower than NeID. When the engine speed is higher than the normal charging start speed NeCH, the generator performs free charging in all four working cycles without limitation. When the engine speed is between the predetermined idling speed NeID and the normal charging start speed NeCH, the generator includes a periodic charging process, which means that the generator is only charged from the working cycle to the exhaust cycle. The high-energy battery is charged during the continuous period; and when the engine speed gradually increases, the time for the generator to charge the high-energy battery during the exhaust cycle is also gradually longer. As shown in Figure 2, when the engine speed Ne gradually increases between NeID and NeCH, the periodic charging process of the first cylinder gradually increases from TIMEAREA1-1 to TIMEAREAn-1; the periodic charging process of the second cylinder increases from TIMEAREA1- 2 is gradually increased to TIMEAREAn-2. The method described in this embodiment charges the high-energy battery through the generator only when the engine torque is in a relatively stable area (working stroke and exhaust stroke), thereby significantly reducing the vibration generated by the HEV hybrid vehicle during charging. and noise.

In the above charging control method of the present invention, the engine ECU, the power management ECU and the power management ECU use the CAN bus to carry out interactive communication in a relatively fast cycle (for example, the update cycle is 1msec), for example, the engine ECU can collect and send the engine working stroke The content of the notification can be, for example, information such as the upper dead angle of the compressor, the ignition angle, and the engine speed. The sent information is transmitted to the power management ECU, and the crankshaft angle and cycle charging time can be estimated through calculation, so as to issue instructions to the charging controller to control the charging process.

For those of ordinary skill in the art, the specific embodiment is only an exemplary description of the present invention in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned method, as long as the method concept and technical solution of the present invention are used to implement the present invention. Various insubstantial improvements, or directly applying the concept and technical solutions of the present invention to other occasions without improvement, are all within the protection scope of the present invention.

Claims (6)

1. A charge control method for an HEV power rotation system using a few-cylinder engine, the HEV includes an engine, a generator, an electric motor and a high-energy battery; The engine; it is characterized in that: when the engine speed is between the predetermined idling speed and the normal charging start speed, the generator includes a periodic charging process, and the periodic charging process means that the generator only operates from the working cycle to The high energy battery is charged during the continuous period until the exhaust cycle. 2. The charging control method according to claim 1, characterized in that: when the engine speed is lower than a predetermined idling speed, the generator does not charge the high-energy battery. 3. The charging control method according to claim 1 or 2, characterized in that: when the engine speed is higher than the normal charging start speed, the generator is charged in all four working cycles. 4. The charging control method according to claim 3, characterized in that: when the engine speed is between the predetermined idling speed and the normal charging start speed, when the engine speed gradually increases, the generator circulates the exhaust gas to the high-energy battery The charging time also gradually becomes longer. 5. The charging control method according to claim 1, wherein the HEV has a single-cylinder engine or a two-cylinder engine. 6. The charge control method according to claim 1, wherein the HEV is a two-cylinder engine with a first cylinder and a second cylinder, and the first cylinder and the second cylinder are separated by two working cycles way of doing work.