Design method for simulating motorcycle engine crankshaft position signal based on eight pairs of motor poles

Abstract

A design method for simulating the crankshaft position signal of a motorcycle engine based on eight pairs of motor poles includes the following steps: the first step is to set the Hall sensor: one pair of the eight pairs of motor poles is extended along the axial direction of the crankshaft to form a pair of special-shaped poles, corresponding to the eight pairs of N and S poles, three phase Hall sensors are arranged at adjacent intervals around the motor stator, and corresponding to the special-shaped poles, a special-pole Hall sensor is arranged adjacent to one of the phase Hall sensors around the motor stator, and both the phase Hall sensor and the special-pole Hall sensor adopt bipolar latch type Hall sensors; the second step is to select the Hall signal: the three phase Hall sensors output three phase Hall signals respectively, and the special-pole Hall sensor outputs a position Hall signal; the third step is to process the Hall signal: the three phase Hall signals and the position Hall signal are expressed through logic to obtain a corresponding logic circuit or software program to generate a simulated crankshaft position signal with a gap.

Description

Technical Field

[0001] The present invention mainly relates to the field of operation control of motorcycles equipped with an integrated starter generator system (ISG), specifically, using a specific magnet inlay rule on a motorcycle motor rotor, and simulating an engine crankshaft position signal that can enable an electric fuel injection control unit (FI-ECU) to accurately calculate the injection and ignition timing through the Hall signal collected by the Hall sensor, thereby controlling the efficient operation of the engine. Background Art

[0002] When a motorcycle engine is running, it needs to calculate the current crankshaft position and engine speed through the engine crankshaft position signal, and then get the accurate engine injection and ignition timing. At present, most motorcycles equipped with an integrated starter generator system (ISG) on the market, when the engine is running, use a magnetic induction trigger installed on the outside of the motor rotor to sense the boss structure made according to specific specifications on the motor rotor, forming a boss signal (boss structure: a certain number of rectangular convex structures are evenly distributed on the outside of the rotor, and one or two rectangular convexities are removed at a specific position to form a gap. The rotor position corresponding to each boss signal in a circle can be determined through the gap). The boss signal is transmitted to the electronic fuel injection controller (FI-ECU) to determine the injection ignition timing and calculate the engine speed. This method not only requires adding a circle of bosses on the outside of the motor rotor, but also requires installing a larger magnetic induction trigger on the outside close to the boss.

[0003] The existing method of obtaining the crankshaft position signal (i.e., boss signal) increases the manufacturing cost and installation process of the motor. At the same time, the magnetic induction trigger installed on the outside of the motor rotor is more easily damaged, which poses a hidden danger to the reliable operation of the engine. Summary of the invention

[0004] In view of the above problems, the present invention provides a design method for simulating the crankshaft position signal of a motorcycle engine based on eight pairs of motor magnetic poles. The present invention aims at obtaining the crankshaft position signal and designs a method that can simplify the motor manufacturing, reduce the cost, and increase the reliability of the engine operation. That is, on the basis of a stator equipped with three Hall sensors, a special-shaped magnet is formed by changing the magnet structure at a specific position on the motor rotor that has a fixed angle relationship with the engine crankshaft, and a new Hall sensor is added on the basis of the existing three Hall sensors to detect the special-shaped magnet. Then, the collected four Hall signals are processed by the method, and finally a simulated crankshaft position signal is output. The electronic fuel injection controller FI-ECU uses the simulated crankshaft position signal to determine the injection ignition timing, calculate the engine speed, and control the engine to run efficiently and reliably.

[0005] The technical solution of the present invention is implemented as follows: a design method for simulating the crankshaft position signal of a motorcycle engine based on eight pairs of motor poles, comprising the following steps:

[0006] In the first step of setting the Hall sensor: one pair of the eight pairs of motor poles is extended along the crankshaft axis to form a pair of special-shaped poles. Corresponding to the eight pairs of N and S poles, three phase Hall sensors are arranged at adjacent intervals around the motor stator. Corresponding to the pair of special-shaped poles, one of the phase Hall sensors is also arranged around the motor stator.

[0007] In the second step of Hall signal processing: when the rotor rotates one circle, the three phase Hall sensors output three phase Hall signals (U, V, W) respectively, and the different magnetic pole Hall sensor outputs a position Hall signal (PCB), the three phase Hall signals (U, V, W) respectively have 16 high and low level states, and the position Hall signal (PCB) has 2 high and low level states;

[0008] In the third step of Hall signal processing: the three phase Hall signals (U, V, W) and the position Hall signal (PCB) are expressed through logic to obtain the corresponding logic circuit or software program to generate a simulated crankshaft position signal (CPS) with a notch.

[0009] As a further improvement of the present invention:

[0010] In the third step of Hall signal processing: when the notch type of the simulated crankshaft position signal (CPS) is 12-1 and the high and low level ratio is 1:1, through the logical expression Y = ((U'·V·W)+(U·V'·W)+(U·V·W'))·(PCB'), CPS = Y is divided into two frequencies, and the corresponding logic circuit or software program is obtained to generate the simulated crankshaft position signal (CPS).

[0011] As a further improvement of the present invention:

[0012] In the third step of Hall signal processing: when the notch type of the simulated crankshaft position signal (CPS) is 24-2 and the high and low level ratio is 1:1, the corresponding logic circuit or software program is obtained through the logical expression CPS=((U'·V·W)+(U·V'·W)+(U·V·W'))·(PCB') to generate the simulated crankshaft position signal (CPS).

[0013] As a further improvement of the present invention:

[0014] In the third step of Hall signal processing: when the notch type of the simulated crankshaft position signal (CPS) is 36-2 and the high and low level ratio is 1:1, the corresponding logic circuit or software program is obtained through the logical expression Y=(U'·V·W)+(U·V'·W)+(U·V·W'), CPS=(Y is first divided by two and then tripled)·((V⊕PCB)·PCB)' to generate the simulated crankshaft position signal (CPS).

[0015] The beneficial technical effect of the present invention is: based on the design method of simulating the crankshaft position signal of a motorcycle engine with eight pairs of motor poles, three phase Hall signals are obtained through the three-phase Hall sensors, and the position Hall signal is obtained through the different magnetic pole Hall sensor. The three phase Hall signals and the position Hall signal are processed by corresponding logic circuits or software programs to generate the simulated crankshaft position signal for determining the engine crankshaft position. Furthermore, through the design method, a crankshaft position signal with a notch type of 12-1 and a high-low level ratio of 1:1 can be simulated, a crankshaft position signal with a notch type of 24-2 and a high-low level ratio of 1:1 can also be simulated, and a crankshaft position signal with a notch type of 36-2 and a high-low level ratio of 1:1 can also be simulated, which facilitates the subsequent control operation of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of signal conversion in Example 1 of the present invention;

[0017] Figure 2 Schematic diagram of the logic circuit of Example 1 of the present invention;

[0018] Figure 3 This is a schematic diagram of signal conversion in Example 2 of the present invention;

[0019] Figure 4 Schematic diagram of the logic circuit of Example 2 of the present invention;

[0020] Figure 5 This is a signal conversion diagram of Example 3 of the present invention;

[0021] Figure 6 Schematic diagram of the logic circuit of Example 3 of the present invention; DETAILED DESCRIPTION

[0022] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the following corresponding statements are made:

[0023] A design method for simulating a motorcycle engine crankshaft position signal based on eight pairs of motor poles comprises the following steps:

[0024] The first step is to set up the Hall sensor: one pair of the eight pairs of motor poles is extended along the crankshaft axis to form a pair of special-shaped poles. Corresponding to the eight pairs of N and S poles, the motor stator is provided with three phase Hall sensors at adjacent intervals. Corresponding to the pair of special-shaped poles, the motor stator is adjacent to one of the phase Hall sensors and is also provided with a special-pole Hall sensor. Both the phase Hall sensor and the special-pole Hall sensor are bipolar latch Hall sensors. In order to facilitate more effective installation of the Hall sensor and realize electrical connection, the three phase Hall sensors are respectively located in adjacent winding slots in the motor stator, and the special-pole Hall sensor is located in the winding group corresponding to the motor stator.

[0025] The second step is Hall signal selection: when the rotor rotates one circle, the three phase Hall sensors output three phase Hall signals (U, V, W) respectively, and the different magnetic pole Hall sensor outputs a position Hall signal (PCB), the three phase Hall signals (U, V, W) have 16 high and low level states respectively, and the position Hall signal (PCB) has 2 high and low level states;

[0026] The third step is Hall signal processing: the three phase Hall signals (U, V, W) and the position Hall signal (PCB) are expressed through logic to obtain the corresponding logic circuit or software program to generate a simulated crankshaft position signal (CPS) with a notch.

[0027] For a known motor, the number of magnet pairs is 8. According to the three-phase Hall signals collected in actual operation, any one-phase Hall signal will form 6 Hall combination states with the other two-phase Hall signals in each complete high and low level cycle (that is, the Hall sensor passes through a pair of adjacent magnet N poles and S poles). When the rotor rotates one circle, 48 level states (that is, 24 cycle signals) will be formed. At the same time, the position Hall signal (hereinafter referred to as PCB signal) collected by the newly added Hall sensor with different magnetic poles is logically operated with the three-phase Hall signal to finally obtain a crankshaft position signal with a notch (hereinafter referred to as CPS signal).

[0028] The number of pole pairs of the ISG motor magnet of the motorcycle is 8, and the corresponding CPS signal types are 12-1, 24-2, 36-2, etc. (36-2 means that when the rotor rotates one circle, 36 periodic signals appear in the CPS signal, and the levels of two adjacent same-level states are reversed, and so on). The following is a detailed description of each embodiment:

[0029] Embodiment 1:

[0030] The motor rotor has 8 pairs of magnetic poles, and a 12-1 type CPS signal needs to be generated. When the rotor rotates one circle, the three-phase Hall signal (U, V, W) forms 16 level states (48 Hall combination states). When the high and low level ratio is 1:1, 24 periodic signals can be obtained through 48 Hall combination states. The levels of the two adjacent same-level states are reversed to obtain a 24-2 signal Y. Then the signal Y is divided into two frequencies to obtain a 12-1 CPS signal. The specific signal conversion is as follows: Figure 1 shown.

[0031] Based on the three-phase Hall signal (U, V, W) and the position Hall signal (PCB), through the logical expression: Y = ((U'·V·W) + (U·V'·W) + (U·V·W'))·(PCB'), and CPS = two-frequency processing of Y (Note: "XOR" is "XOR" is "⊙"; "AND" is "·"; "OR" is "+"; "NOT" is "'", and the same applies below), design the corresponding logic circuit (such as Figure 2 ) or software program, a 12-1 type CPS signal can be generated, and Figure 1 and Figure 2 In, X=((U'·V·W)+(U·V'·W)+(U·V·W')).

[0032] Embodiment 2:

[0033] The motor rotor has 8 pairs of magnetic poles, and a 24-2 type CPS signal needs to be generated. By outputting the signal Y in Example 4, a 24-2 type CPS signal can be obtained. The specific signal conversion is as follows: Figure 3 shown.

[0034] Through the logical expression: CPS = ((U'·V·W) + (U·V'·W) + (U·V·W'))·(PCB'), the corresponding logic circuit is designed (such as Figure 3 ) or software program, a 24-2 type CPS signal can be generated, and Figure 3 and Figure 4 where X=((U'·V·W)+(U·V'·W)+(U·V·W'))).

[0035] Embodiment 3:

[0036] The motor rotor has 8 pairs of magnetic poles, and a 36-2 type CPS signal needs to be generated. When the rotor rotates one circle, the three-phase Hall signal (U, V, W) forms 16 level states (48 Hall combination states). When the high and low level ratio is 1:1, 24 periodic signals Y can be obtained through 48 Hall combination states. Then, the signal Y is divided into two to obtain a 12-periodic signal Y1. Then, Y1 is tripled to obtain a 36-periodic signal Y2. The levels of the two adjacent same-level states of Y2 are reversed to obtain a 36-2 type CPS signal. The specific signal conversion is as follows: Figure 5 shown.

[0037] Through the logical expression: Y = (U'·V·W) + (U·V'·W) + (U·V·W'), CPS = (first divide Y by two and then triple it)·((V⊕PCB)·PCB)', the corresponding logic circuit is designed (such as Figure 6 ) or software program, a 36-2 type CPS signal can be generated, and Figure 5 and Figure 6 Among them, Y1 = divide the frequency of Y by two, and Y2 = triple the frequency of Y1.

[0038] In summary, the Hall signals obtained based on the four Hall sensors can accurately simulate the engine crankshaft position signal. Using this solution can effectively reduce the manufacturing cost of the motor, reduce the motor installation space, reduce the installation process, and improve the reliability of engine operation.

Claims

1. A design method for simulating the crankshaft position signal of a motorcycle engine based on eight pairs of motor poles, characterized in that: The steps include: In the first step of setting the Hall sensor: one pair of the eight pairs of motor poles is extended along the crankshaft axis to form a pair of special-shaped poles. Corresponding to the eight pairs of N and S poles, three phase Hall sensors are arranged at adjacent intervals around the motor stator. Corresponding to the pair of special-shaped poles, a special-pole Hall sensor is arranged adjacent to one of the phase Hall sensors around the motor stator. Both the phase Hall sensor and the special-pole Hall sensor are bipolar latch Hall sensors. In the second step, the Hall signal is selected: when the rotor rotates one circle, the three phase Hall sensors respectively output three phase Hall signals (U, V, W), and the different magnetic pole Hall sensor outputs a position Hall signal (PCB), the three phase Hall signals (U, V, W) respectively have 16 high and low level states, and the position Hall signal (PCB) has 2 high and low level states; In the third step of Hall signal processing: the three phase Hall signals (U, V, W) and the position Hall signal (PCB) are expressed through logic to obtain the corresponding logic circuit or software program to generate a simulated crankshaft position signal (CPS) with a notch.

2. The design method for simulating motorcycle engine crankshaft position signals based on eight pairs of motor poles as claimed in claim 1, characterized in that: In the third step of Hall signal processing: when the notch type of the simulated crankshaft position signal (CPS) is 12-1 and the high and low level ratio is 1:1, through the logical expression Y = ((U'·V·W)+(U·V'·W)+(U·V·W'))·(PCB'), CPS = Y is divided into two frequencies, and the corresponding logic circuit or software program is obtained to generate the simulated crankshaft position signal (CPS).

3. The design method for simulating the crankshaft position signal of a motorcycle engine based on eight pairs of motor poles as claimed in claim 1, characterized in that: In the third step of Hall signal processing: when the notch type of the simulated crankshaft position signal (CPS) is 24-2 and the high and low level ratio is 1:1, the corresponding logic circuit or software program is obtained through the logical expression CPS=((U'·V·W)+(U·V'·W)+(U·V·W'))·(PCB') to generate the simulated crankshaft position signal (CPS).

4. The design method for simulating motorcycle engine crankshaft position signals based on eight pairs of motor poles as claimed in claim 1, characterized in that: In the third step of Hall signal processing: when the notch type of the simulated crankshaft position signal (CPS) is 36-2 and the high and low level ratio is 1:1, the corresponding logic circuit or software program is obtained through the logical expression Y=(U'·V·W)+(U·V'·W)+(U·V·W'), CPS=(Y is first divided by two and then tripled)·((V⊕PCB)·PCB)' to generate the simulated crankshaft position signal (CPS).

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