CN106704072A - Method for controlling starting of engine through starting and electricity generating device - Google Patents

Abstract

The invention relates to a method for controlling starting of an engine through a starting and electricity generating device. The method includes the steps that (A), a power source of a finished automobile exists, whether idling flameout happens to the engine or not is judged, if yes, idling flameout starting of a step (B1) is executed, and if not, key starting of a step (B2) is executed; (B1) and (B2), whether a starting signal exists or not is judged, and if yes, steps (C) and (D) are correspondingly executed; (C), whether natural reversing happens to a crankshaft and exceeds a critical reversing angle or not is judged, if yes, a step (E) is executed, and if not, the step (D) is executed; (D), whether the crankshaft stops in a starting angle interval or not is judged, if yes, the step (E) is executed, and if not or no starting angle interval information exists, a step (F) is executed; (E), a motor is directly driven to rotate forwards to a starting rotation speed, and a step (G) is executed; (F), after the crankshaft reverses by a specific reserving angle, the motor is driven to rotate forwards to the starting rotation speed, and the step (G) is executed; and (G) driving stops, and a power generation mode is started.

Description

Method for controlling engine start by starting and generating device

technical field

The present invention relates to a method for controlling engine starting by a starter and generating device, especially a method for controlling engine starting by a starting and generating device suitable for locomotive engines.

Background technique

At present, there is an integrated starter and generator (Integrated Starter and Generator, hereinafter referred to as ISG) in the market to increase the energy saving effect of the locomotive, and it has the function of idling stop and restart. Generally, when a locomotive is turned off, the stroke will stop before the compression top dead center. At this time, the ISG needs a large torque to overcome the compression pressure of the engine and start the engine.

The usual way to start the engine is to reverse the crankshaft to a predetermined position before starting the engine, and then make it start to rotate forward to drive the engine to have a greater inertia, thereby overcoming the torque at the compression top dead center and driving the engine to an appropriate position. After the ignition speed, the ISG switches to the charging mode to continuously supply power to the vehicle and charge the battery.

The implementation method of the existing ISG architecture mentioned above has a shortcoming. It is necessary to accurately reverse the crankshaft to the previous compression point before each start, and then add inertia after rotation to generate enough torque to overcome the compression point. The engine starts from The time from starting to ignition takes a long time, which is not very ideal, and there is still room for improvement.

Contents of the invention

The main purpose of the present invention is to provide a method for starting and generating device to control engine starting, through the mutual cooperation of the angle sensing device and the decompression device, the engine can be optimized no matter whether the engine is started with a key or at idle. The starting process can effectively reduce the torque required for starting and reduce energy consumption; and the engine can be used for a short time under any condition and any starting crankshaft angle, so that the engine can start quickly and increase the smoothness of engine starting .

In order to achieve the above object, the starting and generating device of the present invention is assembled on a locomotive with a battery, an electronic control unit (ECU), at least one decompression device and an engine, and the starting and generating device includes a drive controller 1. An angle sensing device and a motor connected with a crankshaft of the engine, the angle sensing device includes a motor angle sensor and a crank angle sensor; the method for starting and generating the device to control engine starting includes:

(A) The power supply of car load exists, judges whether engine is idling and flameout, if so then executes the idling flameout starting of step (B1), if not then executes the key start of step (B2).

(B1) judging whether there is a start signal, if so, execute step (C); (B2) judge whether there is a start signal, if so, execute step (D).

(C) Judging whether the crankshaft is naturally reversed to open at least one decompression device and exceeds a critical reverse angle, if so, perform step (E), if not, perform step (D).

(D) Judging whether the crankshaft stops in a starting angle interval, if so, execute step (E), if not or if there is no information about the starting angle interval, execute step (F).

(E) The direct drive motor is rotated forward to the starting speed, and step (G) is performed.

(F) After the crankshaft is reversed for a specific reverse angle, the motor is driven to rotate forward to the starting speed, and step (G) is executed.

(G) Stop driving and enter the power generation mode.

The above step (B2) may further include (B3) judging whether the crankshaft angle record is stored in a memory of the starter and generator, if so, execute step (D), if not, execute step (F). In this way, the crankshaft angle can be stored in the memory of the starter and generator before the key is turned off, and can be used for step (D) judgment when the key is started next time.

The above-mentioned locomotive can be equipped with a start button and an accelerator start device. The start signal of the engine refers to one of the following: the start signal from the electronic control unit, the signal that the start button is pressed, and the start of the accelerator start device. signal of. Wherein, the throttle activation device can be provided with a micro switch for the throttle cable, when the throttle cable is driven, it will touch the micro switch, or the throttle handle is provided with a sensor, which can detect whether the throttle handle is rotated, and the micro switch Or the throttle handle sensor can be used as the throttle activation device.

The above-mentioned at least one decompression device can refer to at least one of the following: a one-way decompression device, and a centrifugal decompression device. The decompression is carried out through this device, which reduces the resistance of the engine crankshaft and improves the smoothness of the crankshaft rotation, so as to facilitate Start the job.

The above-mentioned angle sensing device can be installed on an engine case, including a motor angle sensor and a crankshaft angle sensor, and the angle sensing device can be a single component. The above-mentioned motor angle sensor refers to a Hall sensor, which is used to detect the phase change of a rotor of the starter and power generation device, and switch to the motor or generator mode; relatively, the above-mentioned crankshaft angle sensor can refer to A pulse signal sensing component and a plurality of bumps arranged on the outer surface of the rotor.

The above-mentioned method for controlling engine start by the starting and generating device includes several judging mechanisms of the starting decompression device, among which, the present invention sets critical reverse angle, starting angle range and specific reverse angle for the judgment parameter of crankshaft angle. The above-mentioned critical reverse angle can be 120 degrees, which is used as the threshold angle value of whether the decompression device is successfully triggered when the idle is turned off; Start the engine; the above-mentioned specific inversion angle can be 90 degrees, which is used as the threshold angle value for driving and starting and reversing the power generation device to trigger the decompression device. The above summary and the following detailed description are exemplary in order to further illustrate the scope of the present invention. Other purposes and advantages of the present invention will be described in the following descriptions and illustrations.

Description of drawings

Fig. 1 is the comparison diagram of the crankshaft angle position of the present invention and the motor forward rotation resistance of the starter and power generation device.

Fig. 2 is a sectional view of an engine of a preferred embodiment of the present invention.

Fig. 3 is a structure diagram of the whole vehicle system of a preferred embodiment of the present invention.

Fig. 4 is a structure diagram of a starting and generating device of a preferred embodiment of the present invention.

FIG. 5 is a configuration diagram of an angle sensing device in an engine case according to a preferred embodiment of the present invention.

FIG. 6 is a configuration diagram of a motor angle sensor fixed on an engine case according to a preferred embodiment of the present invention.

Fig. 7 is a method for controlling engine starting by the starting and generating device according to a preferred embodiment of the present invention.

【Symbol Description】

10 battery 11 start button

12 Throttle starting device 20 Starting and generating device

21 Drive controller 22 Angle sensing device

221 Motor angle sensor 2211 Hall sensing component

222 Crankshaft angle sensor 2221 Pulse signal sensing component

2222 Bump 23 Motor

231 Rotor 232 Stator

30 Engine 301 Engine case

31 crankshaft 32 decompression device

33 Electronic control unit 34 PTO shaft

35 Transmission gear 36 Cylinder head

A,B1,B2,B3,C,D,E,F,G step Ⅰ, Ⅱ area

X Curve Y Curve

detailed description

In order to make it easier for those skilled in the art to understand and realize the present invention, the embodiments of the present invention are described in conjunction with the accompanying drawings.

The so-called engine decompression device is generally used in the compression stroke state of the engine piston, please refer to the comparison diagram of the crankshaft angular position and the forward rotation resistance of the motor of the starter and power generation device in Figure 1. As shown in the figure, the coordinates on the vertical axis represent the forward rotation resistance of the starting and generating device, and the coordinates on the horizontal axis represent the rotation angle of the crankshaft. The working principle of the four-stroke engine used in this embodiment is distinguished according to the position of the piston in the cylinder. Arrive at top dead center (T.D.C) or bottom dead center (B.D.C) in sequence every 180 degrees, and start from 0 degrees in each interval and sequentially divide it into four working strokes: power, exhaust, intake and compression , so the crankshaft rotates 720 degrees in one cycle. Among them, in general, in the compression stroke and the decompression device is not turned on, the curve drawn by the forward rotation resistance against the crankshaft angle will be as shown in the X curve; however, in the compression stroke and the decompression device is turned on, The forward rotation resistance plotted against the crankshaft angle will look like the Y curve. In addition, in the figure, 120 degrees is used as the separation point between area I and area II. In area I, the crankshaft is located at 0 to 120 degrees. In the area where the engine is turned and started, as for area II, where the crankshaft is located at 120-720 degrees, the decompression device is not activated, but the starting momentum of the starter and power generation device cannot be started by forward rotation directly. forward rotation area.

Please refer to FIG. 2 and FIG. 3 , which are respectively a sectional view of an engine and a structural diagram of a vehicle system of a preferred embodiment of the present invention. At present, there is an integrated starter and generator (Integrated Starter and Generator, hereinafter referred to as ISG) in the market to increase the energy saving effect of the locomotive, and it has the function of idling stop and restart. As shown in FIG. 2 , the engine in this embodiment mainly includes: a cylinder head 36 , a crankshaft 31 , a power output shaft 34 , a transmission speed change device 35 , a starting and generating device 20 and a decompression device 32 . Wherein, the starting and generating device 20 is assembled at one end of the power output shaft 34 connected with the crankshaft 31, and is located at one side of the crankshaft 31, and the other end of the power output shaft 34 is assembled with a transmission transmission device 35.

As shown in the figure, the starting and generating device 20 of the whole vehicle structure of the present embodiment is assembled with a battery 10, a starting button 11, an electronic control unit 33 (ECU), an accelerator starting device 12, and an engine 30. on a locomotive, and the engine 30 is equipped with a decompression device 32, wherein the decompression device 32 can be at least one of a one-way decompression device or a centrifugal decompression device to reduce the resistance of the crankshaft 31 of the engine 30, Improve the smoothness of the rotation of the crankshaft 31 to facilitate the starting operation. That is, the starting and generating device 20 is connected to the battery 10 , the starting button 11 , the accelerator starting device 12 , the electronic control unit 33 , and the engine 30 .

Please refer to FIG. 4 and FIG. 5 together, which are respectively a structural diagram of the starting and generating device and a configuration diagram of the angle sensing device in the engine case according to a preferred embodiment of the present invention. As shown in the figure, the starting and generating device 20 is electrically connected to the battery 10 , and the starting and generating device 20 includes a drive controller 21 , an angle sensing device 22 , and a motor 23 connected to the crankshaft 31 of the engine 30 . Wherein, the drive controller 21 can detect information such as phase sequence and angular position of the motor 23 and the crankshaft 31 of the engine 30 through the angle sensing device 22 . In this embodiment, the angle sensing device 22 includes a motor angle sensor 221 and a crank angle sensor 222 . Through the above design, the signals used to detect the electrical angles of the motor 23 and the crankshaft 31 can effectively grasp the piston stroke of the engine 30 and obtain the absolute position of the crankshaft 31 in each revolution.

The motor 23 includes a rotor 231 and a stator 232, connected to a crankshaft 31 of the engine 30, wherein, in order to accurately grasp the operating states of the starting and generating device 20 and the engine 30, the present invention is provided with an angle sensing device 22, which is mounted on An engine case 301 includes a motor angle sensor 221 and a crankshaft angle sensor 222 . As shown in Figure 6, it is a configuration diagram of a motor angle sensor fixed on the engine case in a preferred embodiment of the present invention. The motor angle sensor 221 of this embodiment mainly includes three motor angle sensors fixed on the engine case. The Hall sensing component 2211 and a control circuit on the 232 can detect the change of the magnet polarity of the rotor 231, and judge the conversion time point of the motor 23 driving and generating electricity through the variation of the three phases; in addition, the crankshaft angle sensor 222 includes a pulse signal sensing component 2221 and a plurality of bumps 2222 correspondingly arranged on the outer surface of the rotor 231, each bump 2222 is equidistantly arranged on the outer surface, and a pulse wave is sent through the pulse signal sensing component 2221 to detect each bump After the position of block 2222 is returned and the pulse signal is returned, the absolute position of the crankshaft 31 in each revolution can be known.

Please refer to Fig. 7, it is the method for starting and generating device control engine starting of a preferred embodiment of the present invention, comprising the following steps: step (A) the power supply of the whole vehicle exists, judge whether the engine 30 is idling and stalled, if so, perform the step ( The idling flame-off start of B1), if not the key start of step (B2). (B1) judging whether there is a start signal, if so, execute step (C); (B2) judge whether there is a start signal, if so, execute step (D). In this embodiment, the vehicle power supply of the battery 10 exists, and the starting and generating device 20 must first be made aware that it is currently in the state of key starting or idling and flameout starting, and this engine starting method has different functions for the above two states. Judgment method, the main reason is that the crankshaft does not reverse naturally when the key is started, so it must be reversed by a specific angle before starting forward, and if the natural reverse angle is reversed by a specific angle during idling and flameout, it will open Decompression mechanism, so it can be started directly in forward rotation without additional inversion.

Then, under the state of idling stop and starting, step (C) judges whether the crankshaft 31 has a natural reverse to open at least one decompression device 32 and exceeds a critical reverse angle, if so, execute step (E), if not, execute step ( D). Wherein, the critical reversing angle is 120 degrees in this embodiment, and it is not limited thereto. It is used as a threshold angle value for whether the decompression device 32 is successfully triggered when the engine is turned off at idle. Thereby, the compression resistance may not be broken through before the engine 30 stops, and a natural reverse action occurs. When this phenomenon occurs and exceeds 120 degrees, the opening of the decompression device 32 is ensured.

On the other hand, in the state of key starting, step (B3) judges whether the angle record of the crankshaft 31 is stored in a memory of the starter and generator device 20, if so, execute step (D), if not, execute the steps described later (F). Thereby, the above-mentioned angle of the crankshaft 31 can be stored in the memory of the starter and generator 20 before the key is turned off, and can be used for step (D) judgment when the key is started next time. Or, if there is no natural reversing or the natural reversing angle is less than the critical reversing angle under the state of idling and flame-out starting, execute step (D) to judge whether the crankshaft 31 stops in a starting angle interval, if so, execute step (E), if If it is not or there is no starting angle interval information, step (F) is executed. Wherein, the starting angle range in this embodiment is from 0° to 120°, which is not limited thereto. If the angular position of the crankshaft 31 within the above range can be directly rotated to start the engine 30 without decompression. That is to say, the position where the crankshaft 31 is stopped can utilize the running inertia to overcome the first compression resistance, execute step (E) directly to drive the motor 23 forward to the starting speed without the action of the decompression device 32, and execute the step ( G).

Relatively, if the above-mentioned crankshaft 31 is not within the range of starting angle, perform step (F) reverse the crankshaft 31 for a certain reverse angle, then drive the motor 23 forward to the starting speed, and perform step (G). Wherein, the specific reversing angle is 90 degrees in this embodiment, and it is not limited thereto, and it is used as a threshold angle value for driving the starting and generating device 20 to reverse to trigger the decompression device. That is to say, the position where the crankshaft 31 stops cannot use the operating inertia to overcome the first compression resistance within 120 degrees to 720 degrees. Therefore, the starter and power generation device 20 will reverse a specific reverse angle and then drive the motor 23 forward to start. The rotation speed, the specific reverse angle ensures the opening of the decompression device 32 and drives the motor 23 to rotate forward.

Next, step (G) stops the drive and enters the power generation mode. At this point, it means that the starter and power generation device 20 has successfully driven the engine 30 to start, and can enter the power generation mode.

In this embodiment, through the mutual cooperation of the angle sensing device 22 and the decompression device 32, the engine 30 can achieve an optimized starting process no matter whether it is a key start or an idling and flame-off start, effectively reducing the torque required for starting and reducing energy. Consumption; and engine 30 can be used under any condition and any starting crankshaft 31 angles for a short time, so that engine 30 can be started quickly and the smoothness of engine 30 startup can be increased.

Although the present invention has been described by the embodiments, those of ordinary skill in the art know that, without departing from the spirit and essence of the present invention, the present invention can have many modifications and variations, and the scope of the present invention is defined by the appended rights Requirements to limit.

Claims (10)

1. it is a kind of to start the method that simultaneous TRT controls engine start, it is characterised in that to start and generate electricity Device control engine is mounted on a battery, at least an electronic control unit, a decompressor and an engine A locomotive on, including a bent axle of a drive control device, an angle sensing device further and one and the engine links Motor, the angle sensing device further include a motor angle perceptron and a crankshaft angles perceptron；The startup And TRT controls the method for the engine start to include：

(A) vehicle power supply exist, judge the engine whether idling flameout, if then perform step (B1) it is idle Speed is flame-out to be started, if not the key for then performing step (B2) is started；

(B1) start signal is determined whether, if then performing step (C)；

(B2) start signal is determined whether, if then performing step (D)；

(C) judge the bent axle whether have nature reverse with open an at least decompressor and it is critical more than one fall Gyration, if then performing step (E), if not then performing step (D)；

(D) judge whether the bent axle is stopped in a starting angular interval, if then performing step (E), if not It is or the information without the starting angular interval then performs step (F)；

(E) directly drive the motor and just go to starting speed, and perform step (G)；

(F) drive the motor just to go to starting speed again after the specific reversing angle of bent axle reversion one, and perform step Suddenly (G)；And

(G) stop driving, into power generation mode.

It is 2. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that (B3) is further included after step (B2) and judges whether the angle record of the bent axle is stored to the actuating and generating device An internal memory in, if then perform step (D), if not then perform step (F).

It is 3. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that The locomotive crew is provided with a start button and a throttle starter, the enabling signal of the engine mean it is following its One：The signal and the throttle that start signal that the electronic control unit is transmitted, the start button are pressed start The signal that device is activated.

It is 4. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that An at least decompressor means following at least one：One-way fashion decompressor and centrifugal decompressor.

It is 5. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that The motor angle perceptron means Hall chip sensor (Hall sensor), is used to detect the startup and the dress that generates electricity The phase place change of the rotor put, and switch to motor or generator mode.

It is 6. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that The crankshaft angles perceptron means a pulse signal perception component and is arranged at the plural convex of the rotor outer surface Block.

It is 7. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that The critical reversing angle system is 120 degree

It is 8. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that The startup angular interval system is 0 degree to 120 degree.

It is 9. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, it is characterised in that The specific reversing angle system is 90 degree.

10. as claimed in claim 1 to start the method that simultaneous TRT controls engine start, its feature exists In the angle sensing device further is installed on an engine casing.