Ignition system for gasoline engine, gasoline engine and ignition method

Abstract

The present invention discloses an ignition system for a gasoline engine, a gasoline engine and an ignition method. The gasoline engine includes at least two cylinder groups, each cylinder group includes a first cylinder and a second cylinder. The ignition system includes at least two spark plug groups and at least two ignition coil groups. Each spark plug group includes a first spark plug and a second spark plug. Each ignition coil group includes a first ignition coil and a second ignition coil. The first ignition coil includes a first primary coil, a first secondary coil and a first iron core, and the second ignition coil includes a second primary coil, a second secondary coil and a second iron core. The first end of the first secondary coil and the first end of the second secondary coil are electrically connected to the input end of the first spark plug and the input end of the second spark plug, respectively, and the second end of the first secondary coil and the second end of the second secondary coil are electrically connected to the input end of the first spark plug, respectively. The ignition system for a gasoline engine has the advantage of high ignition capability.

Description

Technical Field

[0001] The present invention relates to the field of engines, and in particular to an ignition system for a gasoline engine, a gasoline engine and an ignition method. Background Art

[0002] With the development of the automobile industry, the number of cars has been increasing year by year, and the air pollution problem caused by cars has become increasingly serious. Therefore, the requirements for fuel consumption and emissions of cars are becoming more and more stringent. Lean burn technology is gaining more and more attention as a potential technology for high-efficiency gasoline internal combustion engines because of its more complete fuel combustion and small pumping air loss at partial load. One of the difficulties in realizing lean burn technology is to shorten the flame development time and combustion duration. However, since ordinary ignition coils only have one set of primary-secondary coils, it takes a certain amount of time to charge the primary coil. Therefore, the primary coil cannot be charged and discharged multiple times in a single engine cycle, which limits the ignition ability of the spark plug. Therefore, the ignition system used for gasoline engines in the prior art has the problem of low ignition ability.

[0003] Therefore, the ignition system for gasoline engines in the prior art has the problem of low ignition capability. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of low ignition capability of the ignition system for gasoline engine in the prior art.

[0005] To solve the above problems, an embodiment of the present invention provides an ignition system for a gasoline engine, wherein the gasoline engine includes at least two cylinder groups, each cylinder group includes a first cylinder and a second cylinder, and when the first cylinder is at the top dead center of the compression stroke, the second cylinder is at the top dead center of the exhaust stroke. The ignition system includes at least two spark plug groups and at least two ignition coil groups arranged in a one-to-one correspondence with the at least two spark plug groups, and the at least two spark plug groups are arranged in a one-to-one correspondence with the at least two cylinder groups; each spark plug group includes a first spark plug and a second spark plug, and the first spark plug and the second spark plug are respectively arranged on the first cylinder and the second cylinder in the corresponding cylinder group.

[0006] Each ignition coil group includes a first ignition coil and a second ignition coil, the first ignition coil includes a first primary coil, a first secondary coil and a first iron core, and the second ignition coil includes a second primary coil, a second secondary coil and a second iron core; the first primary coil and the first secondary coil are respectively wound on the first iron core, and the second primary coil and the second secondary coil are respectively wound on the second iron core. The first end and the second end of the first secondary coil are respectively electrically connected to the first end and the second end of the second secondary coil, and the first end of the first secondary coil is electrically connected to the input end of the first spark plug through the second secondary coil, and the first end of the first secondary coil is electrically connected to the input end of the second spark plug, and the second end of the first secondary coil is electrically connected to the input end of the first spark plug; the first end of the second secondary coil is electrically connected to the input end of the first spark plug through the first secondary coil, and the first end of the second secondary coil is electrically connected to the input end of the second spark plug; the second end of the second secondary coil is electrically connected to the input end of the first spark plug.

[0007] By adopting the above technical solution, when high-energy ignition is required, the first primary coil and the second primary coil are first controlled to be in a charging state, and then the first primary coil is controlled to be in a discharging state. At this time, the first secondary coil will generate an induced voltage due to the magnetic induction phenomenon, and the current generated by the induced voltage will be transmitted from the first end of the first secondary coil to the input end of the first spark plug and the input end of the second spark plug respectively, and from the second end of the first secondary coil to the input end of the first spark plug, thereby making the first spark plug and the second spark plug both in an ignition state. Then the second primary coil is controlled to be in a discharging state. At this time, the second secondary coil will generate an induced voltage due to the magnetic induction phenomenon, and the current generated by the induced voltage will be transmitted from the first end of the second secondary coil to the input end of the first spark plug and the input end of the second spark plug respectively, and from the second end of the second secondary coil to the input end of the first spark plug, thereby making the first spark plug and the second spark plug both in an ignition state again. Therefore, the ignition system for a gasoline engine can make the first spark plug and the second spark plug in an ignition state multiple times within a single engine cycle, thereby improving the ignition capability. Therefore, the ignition system for the gasoline engine has the advantage of high ignition capability. At the same time, the first spark plug and the second spark plug are in the ignition state for many times, which can increase the combustion duration in the first cylinder and the second cylinder, so that the gasoline burns more fully, and has the advantage of higher gasoline combustion rate.

[0008] Another embodiment of the present invention provides an ignition system for a gasoline engine, wherein a first one-way control element is disposed on the second end of the first secondary coil, and a second one-way control element is disposed on the second end of the second secondary coil. The input end of the first one-way control element is electrically connected to the second end of the first secondary coil, and the output end of the first one-way control element is electrically connected to the input end of the first spark plug. The input end of the second one-way control element is electrically connected to the second end of the second secondary coil, and the output end of the second one-way control element is electrically connected to the input end of the first spark plug.

[0009] By adopting the above technical solution, the setting of the first unidirectional control element can prevent the current on the second end of the second secondary coil from being transmitted to the input end of the second spark plug, and the setting of the second unidirectional control element can prevent the current on the second end of the first secondary coil from being transmitted to the input end of the second spark plug, thereby preventing the second spark plug from being ignited multiple times.

[0010] Another embodiment of the present invention provides an ignition system for a gasoline engine, the ignition system further comprising at least four ignition switches, a control device, and a first energy supply device. Each first primary coil and each second primary coil are electrically connected to an ignition switch. The first energy supply device is electrically connected to each first ignition coil and each second ignition coil. The signal output end of the control device is communicatively connected to the signal input end of each ignition switch.

[0011] By adopting the above technical solution, the control device can control the ignition switch to be in a power-on or power-off state, thereby controlling the charging or discharging of each first primary coil and each second primary coil. The first energy supply device is used to provide electrical energy to each first ignition coil and each second ignition coil.

[0012] Another embodiment of the present invention provides an ignition system for a gasoline engine, the ignition system further comprising a second energy supply device. The control device comprises a vehicle controller and a control unit disposed on each ignition switch, the signal output end of the vehicle controller is communicatively connected to the signal input end of each control unit, and each control unit is electrically connected to the second energy supply device.

[0013] With the above technical solution, the second energy supply device is used to provide electrical energy to each ignition switch. The vehicle controller controls the power on or off of each control unit, controls the power on or off of the second energy supply device and each ignition switch, and further controls the charging or discharging of each first primary coil and each second primary coil.

[0014] Another embodiment of the present invention provides an ignition system for a gasoline engine, wherein the ignition switch includes an NPN transistor. One end of each first primary coil and each second primary coil is electrically connected to the positive electrode of the first energy supply device, and the other end is electrically connected to the collector of a different NPN transistor, and the emitter of each NPN transistor is electrically connected to the negative electrode of the first energy supply device; the base of each NPN transistor is electrically connected to a different control unit.

[0015] By adopting the above technical solution, compared with other structures, the ignition switch is set as an NPN transistor, which can facilitate the control of the NPN transistor.

[0016] Another embodiment of the present invention provides an ignition system for a gasoline engine, wherein a resistor element is arranged between the base of each NPN transistor and each control unit, and the input end of the resistor element is electrically connected to the control unit, and the output end of the resistor element is electrically connected to the input end of the base of the NPN transistor.

[0017] By adopting the above technical solution, when the current between the second energy supply device and the base of the NPN transistor is greater than the rated current of the NPN transistor, the setting of the resistance element can protect the NPN transistor.

[0018] Another embodiment of the present invention provides an ignition system for a gasoline engine, the gasoline engine includes two cylinder groups, the ignition system includes two spark plug groups, two ignition coil groups and four ignition switches; and the first unidirectional control element and the second unidirectional control element are both configured as diodes.

[0019] An embodiment of the present invention further provides a gasoline engine, comprising the above-mentioned ignition system for a gasoline engine.

[0020] By adopting the above technical solution, the ignition system of the gasoline engine can make the first spark plug and the second spark plug be in the ignition state multiple times in a single engine cycle, thereby improving the ignition capability. Therefore, the ignition system of the gasoline engine has the advantage of high ignition capability.

[0021] An embodiment of the present invention further provides an ignition method for a gasoline engine. The ignition method performs an ignition process through the above-mentioned ignition system for a gasoline engine. The specific steps are as follows:

[0022] S1: Acquire the status information of each cylinder group in real time, and control the first primary coil and the second primary coil to be in a charging state;

[0023] S2: judging whether the first cylinder and the second cylinder meet the ignition condition according to the state information;

[0024] If yes, execute step S3;

[0025] If not, continue to execute step S1;

[0026] S3: Control the first primary coil to be in a discharge state, and after maintaining the state for a preset time, control the second primary coil to be in a discharge state.

[0027] By adopting the above technical solution, compared with the ordinary ignition method, the ignition method can control the first primary coil and the second primary coil to charge and discharge multiple times within a single engine cycle, so that the first spark plug and the second spark plug are in the ignition state multiple times, thereby improving the ignition capability.

[0028] Another embodiment of the present invention provides an ignition method for a gasoline engine, wherein in step S1, the state information is a position of a first piston in a first cylinder relative to the first cylinder, and a position of a second piston in a second cylinder relative to the second cylinder;

[0029] The ignition condition is that the first piston of the first cylinder is at the top dead center of the compression stroke, and the second piston of the second cylinder is at the top dead center of the exhaust stroke.

[0030] The beneficial effects of the present invention are:

[0031] The present invention provides an ignition system for a gasoline engine, wherein the gasoline engine includes at least two cylinder groups, each cylinder group includes a first cylinder and a second cylinder. Each ignition coil group includes a first ignition coil and a second ignition coil, the first ignition coil includes a first primary coil, a first secondary coil and a first iron core, and the second ignition coil includes a second primary coil, a second secondary coil and a second iron core. The first end and the second end of the first secondary coil are electrically connected to the first end and the second end of the second secondary coil, respectively, and the first end of the first secondary coil is electrically connected to the input end of the first spark plug and the input end of the second spark plug, respectively, and the second end of the first secondary coil is electrically connected to the input end of the first spark plug. The first end of the second secondary coil is electrically connected to the input end of the first spark plug and the input end of the second spark plug, respectively; the second end of the second secondary coil is electrically connected to the input end of the first spark plug. When high-energy ignition is required, the first primary coil and the second primary coil are first controlled to be in a charging state, and then the first primary coil is controlled to be in a discharging state. At this time, the first secondary coil will generate an induced voltage due to the magnetic induction phenomenon, and the current generated by the induced voltage will be transmitted from the first end of the first secondary coil to the input end of the first spark plug and the input end of the second spark plug, respectively, and from the second end of the first secondary coil to the input end of the first spark plug, thereby making the first spark plug and the second spark plug both in an ignition state. Then the second primary coil is controlled to be in a discharging state. At this time, the second secondary coil will generate an induced voltage due to the magnetic induction phenomenon, and the current generated by the induced voltage will be transmitted from the first end of the second secondary coil to the input end of the first spark plug and the input end of the second spark plug, respectively, and from the second end of the second secondary coil to the input end of the first spark plug, thereby making the first spark plug and the second spark plug both in an ignition state again. Therefore, the ignition system for a gasoline engine can make the first spark plug and the second spark plug in an ignition state multiple times within a single engine cycle, thereby improving the ignition capability. Therefore, the ignition system for a gasoline engine has the advantage of high ignition capability. At the same time, the first spark plug and the second spark plug being in the ignition state for multiple times can increase the combustion duration in the first cylinder and the second cylinder, thereby making the gasoline burn more completely and having the advantage of a higher gasoline combustion rate.

[0032] Other features and corresponding beneficial effects of the present invention are described in the latter part of the specification, and it should be understood that at least part of the beneficial effects become obvious from the description in the specification of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the connection relationship of various components of an ignition system for a gasoline engine provided in Example 1 of the present invention;

[0034] Figure 2 A flow chart of an ignition method for a gasoline engine provided in Embodiment 3 of the present invention;

[0035] Figure 3 This is a diagram of current changes of various components when the first cylinder of the ignition method for a gasoline engine provided in Example 3 of the present invention is in an ignition state.

[0036] Description of reference numerals:

[0037] 10: spark plug group; 110: first spark plug; 120: second spark plug;

[0038] 20: Ignition coil assembly;

[0039] 210: first ignition coil;

[0040] 211: first primary coil;

[0041] 212: first secondary coil; 212a: first end of the first secondary coil; 212b: second end of the first secondary coil;

[0042] 213: first core;

[0043] 220: second ignition coil;

[0044] 221: second primary coil;

[0045] 222: second secondary coil; 222a: first end of the second secondary coil; 222b: second end of the second secondary coil;

[0046] 223: second core;

[0047] 30: diode;

[0048] 40: NPN transistor;

[0049] 50: first energy supply device; 510: positive electrode of the first energy supply device; 520: negative electrode of the first energy supply device;

[0050] 60: Control unit. DETAILED DESCRIPTION

[0051] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0052] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0053] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0055] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0056] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0057] Example 1

[0058] This embodiment provides an ignition system for a gasoline engine, such as Figure 1As shown, the gasoline engine includes at least two cylinder groups, each cylinder group includes a first cylinder and a second cylinder, and when the first cylinder is at the top dead center of the compression stroke, the second cylinder is at the top dead center of the exhaust stroke. The ignition system includes at least two spark plug groups 10 and at least two ignition coil groups 20 arranged in a one-to-one correspondence with the at least two spark plug groups 10, and the at least two spark plug groups 10 are arranged in a one-to-one correspondence with the at least two cylinder groups; each spark plug group 10 includes a first spark plug 110 and a second spark plug 120, and the first spark plug 110 and the second spark plug 120 are respectively arranged on the first cylinder and the second cylinder in the corresponding cylinder group.

[0059] Each ignition coil group 20 includes a first ignition coil 210 and a second ignition coil 220. The first ignition coil 210 includes a first primary coil 211, a first secondary coil 212 and a first iron core 213, and the second ignition coil 220 includes a second primary coil 221, a second secondary coil 222 and a second iron core 223; the first primary coil 211 and the first secondary coil 212 are respectively wound around the first iron core 213, and the second primary coil 221 and the second secondary coil 222 are respectively wound around the second iron core 223. The first end 212a and the second end 212b of the first secondary coil 212 are electrically connected to the first end 222a and the second end 222b of the second secondary coil 222, respectively, and the first end 212a of the first secondary coil 212 is electrically connected to the input end of the first spark plug 110 through the second secondary coil 222, and the first end 212a of the first secondary coil 212 is electrically connected to the input end of the second spark plug 120, and the second end 212b of the first secondary coil 212 is electrically connected to the input end of the first spark plug 110. The first end 222a of the second secondary coil 222 is electrically connected to the input end of the first spark plug 110 through the first secondary coil 212, and the first end 222a of the second secondary coil 222 is electrically connected to the input end of the second spark plug 120; the second end 222b of the second secondary coil 222 is electrically connected to the input end of the first spark plug 110.

[0060] Specifically, the gasoline engine may include two cylinder groups, three cylinder groups, four cylinder groups, etc., and the engine formed by the gasoline engine is correspondingly a four-cylinder engine, a six-cylinder engine, an eight-cylinder engine, etc. Correspondingly, the number of the spark plug group 10 and the ignition coil group 20 is determined according to the number of cylinder groups. Preferably, the gasoline engine in this embodiment includes two cylinder groups, and each of the two cylinder groups includes a first cylinder and a second cylinder.

[0061] It should be noted that when high-energy ignition is required, the first primary coil 211 and the second primary coil 221 are first controlled to be in a charging state, and then the first primary coil 211 is controlled to be in a discharging state. At this time, the first secondary coil 212 will generate an induced voltage due to the magnetic induction phenomenon. The current generated by the induced voltage will be transmitted from the first end 212a of the first secondary coil 212 to the input end of the first spark plug 110 and the input end of the second spark plug 120 respectively, and from the second end 212b of the first secondary coil 212 to the input end of the first spark plug 110, thereby making the first spark plug 110 and the second spark plug 120 both in an ignition state. Then the second primary coil 221 is controlled to be in a discharge state, at which time the second secondary coil 222 will generate an induced voltage due to the magnetic induction phenomenon, and the current generated by the induced voltage will be transmitted from the first end 222a of the second secondary coil 222 to the input end of the first spark plug 110 and the input end of the second spark plug 120 respectively, and from the second end 222b of the second secondary coil 222 to the input end of the first spark plug 110, so that the first spark plug 110 and the second spark plug 120 are both in an ignition state again. Therefore, the ignition system for a gasoline engine can make the first spark plug 110 and the second spark plug 120 in an ignition state for many times within a single engine cycle, thereby improving the ignition capability. Therefore, the ignition system for a gasoline engine has the advantage of high ignition capability. At the same time, the first spark plug 110 and the second spark plug 120 being in an ignition state for many times can increase the combustion duration in the first cylinder and the second cylinder, so that the gasoline burns more fully, and has the advantage of a higher gasoline combustion rate.

[0062] Furthermore, this embodiment also provides an ignition system for a gasoline engine, such as Figure 1 As shown, a first unidirectional control element is disposed on the second end 212b of the first secondary coil 212, and a second unidirectional control element is disposed on the second end 222b of the second secondary coil 222. The input end of the first unidirectional control element is electrically connected to the second end 212b of the first secondary coil 212, and the output end of the first unidirectional control element is electrically connected to the input end of the first spark plug 110. The input end of the second unidirectional control element is electrically connected to the second end 222b of the second secondary coil 222, and the output end of the second unidirectional control element is electrically connected to the input end of the first spark plug 110.

[0063] Specifically, the first unidirectional control element allows current to be output only from the second end 212b of the first secondary coil 212, but not input from the second end 212b of the first secondary coil 212. The second unidirectional control element allows current to be output only from the second end 222b of the second secondary coil 222, but not input from the second end 222b of the second secondary coil 222.

[0064] More specifically, the first unidirectional control element and the second unidirectional control element can be configured as a diode 30, a unidirectional thyristor rectifier or other unidirectional control elements. Preferably, in order to make the electrical connection structure simpler, the first unidirectional control element and the second unidirectional control element in this embodiment are both configured as a diode 30.

[0065] It should be noted that the setting of the first unidirectional control element can prevent the current on the second end 222b of the second secondary coil 222 from being transmitted to the input end of the second spark plug 120, and the setting of the second unidirectional control element can prevent the current on the second end 212b of the first secondary coil 212 from being transmitted to the input end of the second spark plug 120, thereby preventing the second spark plug 120 from being ignited multiple times.

[0066] Furthermore, this embodiment also provides an ignition system for a gasoline engine, such as Figure 1 As shown, the ignition system further includes at least four ignition switches, a control device, and a first energy supply device 50. Each first primary coil 211 and each second primary coil 221 are electrically connected to an ignition switch. The first energy supply device 50 is electrically connected to each first ignition coil 210 and each second ignition coil 220. The signal output end of the control device is communicatively connected to the signal input end of each ignition switch.

[0067] Specifically, since each first primary coil 211 and each second primary coil 221 are electrically connected to an ignition switch, the ignition system may include four ignition switches, six ignition switches, or eight ignition switches, etc. The specific setting can be based on actual design and use requirements, and this embodiment does not specifically limit this.

[0068] More specifically, the first energy supply device 50 can be provided separately or provided by the generator of the gasoline engine. Preferably, the electric energy of the first energy supply device 50 in this embodiment is provided by the generator of the gasoline engine, and the voltage provided by the first energy supply device 50 is 12V.

[0069] It should be noted that the control device can control the ignition switch to be powered on or off, thereby controlling the charging or discharging of each first primary coil 211 and each second primary coil 221. The first energy supply device 50 is used to provide electrical energy to each first ignition coil 210 and each second ignition coil 220.

[0070] Furthermore, if Figure 1As shown, this embodiment also provides an ignition system for a gasoline engine, and the ignition system also includes a second energy supply device (not shown in the figure). The control device includes a vehicle controller (not shown in the figure) and a control unit 60 arranged on each ignition switch, the signal output end of the vehicle controller is communicatively connected with the signal input end of each control unit 60, and each control unit 60 is electrically connected to the second energy supply device.

[0071] Specifically, the second energy supply device can be provided separately or provided by the generator of the gasoline engine. It can be set according to the actual design and use requirements, and this embodiment does not make specific restrictions on this.

[0072] It should be noted that the second energy supply device is used to provide electrical energy to each ignition switch. The vehicle controller controls the power on or off of each control unit 60, controls the power on or off of the second energy supply device and each ignition switch, and further controls the charging or discharging of each first primary coil 211 and each second primary coil 221.

[0073] Furthermore, this embodiment also provides an ignition system for a gasoline engine, such as Figure 1 As shown, the ignition switch includes an NPN transistor 40. One end of each first primary coil 211 and each second primary coil 221 is electrically connected to the positive electrode 510 of the first energy supply device 50, and the other end is electrically connected to the collector of a different NPN transistor 40, and the emitter of each NPN transistor 40 is electrically connected to the negative electrode 520 of the first energy supply device 50; the base of each NPN transistor 40 is electrically connected to a different control unit 60.

[0074] Specifically, the vehicle controller controls the saturation power-on and power-off of the NPN transistor 40 by controlling the power-on and power-off of the second energy supply device and the base of the NPN transistor 40 , thereby controlling the charging or discharging of the first primary coil 211 or the second primary coil 221 .

[0075] It should be noted that, compared with other structures, the ignition switch is configured as the NPN transistor 40 to facilitate the control of the NPN transistor 40 .

[0076] Furthermore, the present embodiment also provides an ignition system for a gasoline engine, wherein a resistor element (not shown in the figure) is arranged between the base of each NPN transistor 40 and each control unit 60, and the input end of the resistor element is electrically connected to the control unit 60, and the output end of the resistor element is electrically connected to the input end of the base of the NPN transistor 40.

[0077] Specifically, the resistance of the resistance element is determined according to the input voltage of the second energy supply device and the characteristics of the NPN transistor 40 .

[0078] It should be noted that when the current between the second energy supply device and the base of the NPN transistor 40 is greater than the rated current of the NPN transistor 40 , the setting of the resistance element can protect the NPN transistor 40 .

[0079] Furthermore, this embodiment also provides an ignition system for a gasoline engine, such as Figure 1 As shown, the gasoline engine includes two cylinder groups, the ignition system includes two spark plug groups 10 , two ignition coil groups 20 and four ignition switches; and the first one-way control element and the second one-way control element are both set as diodes 30 .

[0080] The ignition system for a gasoline engine can also perform common ignition. During common ignition, it is only necessary to control the first primary coil 211 to undergo a charge-discharge process first, and then control the second primary coil 221 to undergo a charge-discharge process, to complete the common ignition.

[0081] Example 2

[0082] This embodiment provides a gasoline engine, including the ignition system for the gasoline engine in Embodiment 1.

[0083] It should be noted that the ignition system of the gasoline engine can make the first spark plug 110 and the second spark plug 120 be in the ignition state multiple times within a single engine cycle, thereby improving the ignition capability. Therefore, the ignition system of the gasoline engine has the advantage of high ignition capability.

[0084] Example 3

[0085] This embodiment provides an ignition method for a gasoline engine. The ignition method performs an ignition process by using the ignition system for a gasoline engine in Embodiment 1. Figure 2 As shown, the specific steps are as follows:

[0086] S1: Acquire the status information of each cylinder group in real time, and control the first primary coil 211 and the second primary coil 221 to be in a charging state;

[0087] S2: judging whether the first cylinder and the second cylinder meet the ignition condition according to the state information;

[0088] If yes, execute step S3;

[0089] If not, continue to execute step S1;

[0090] S3: Control the first primary coil 211 to be in a discharge state, and after maintaining the state for a preset time, control the second primary coil 221 to be in a discharge state.

[0091] Specifically, the preset time can be set within the range of 100-200us, for example, 100us, 120us, 155us, 178us, 200us, etc. It can be set according to actual design and usage requirements, and this embodiment does not make any specific limitation on this.

[0092] More specifically, the status information of each cylinder group can be acquired by a position sensor, and the charging or discharging status of the first primary coil 211 and the second primary coil 221 is controlled by the vehicle controller.

[0093] More specifically, the working process of the ignition system for gasoline engines is as follows: the position sensor obtains the status information of each cylinder group and transmits the status information to the vehicle controller. After receiving the status information, the vehicle controller determines whether the first cylinder and the second cylinder meet the ignition conditions. When the first cylinder and the second cylinder meet the ignition conditions, the vehicle controller first controls the NPN transistor 40 corresponding to the first ignition coil 210 to cut off the power, so that the first primary coil 211 is in a discharge state. At this time, the first secondary coil 212 will generate an induced voltage due to the magnetic induction phenomenon. The current generated by the induced voltage will be transmitted from the first end 212a of the first secondary coil 212 to the input end of the first spark plug 110 and the input end of the second spark plug 120 respectively, and from the second end 212b of the first secondary coil 212 to the input end of the first spark plug 110, thereby making the first spark plug 110 and the second spark plug 120 both in the ignition state.

[0094] After a certain preset time, the vehicle controller controls the NPN transistor 40 corresponding to the second ignition coil 220 to cut off the power, so that the second primary coil 221 is in a discharge state. At this time, the second secondary coil 222 will generate an induced voltage due to the magnetic induction phenomenon. The current generated by the induced voltage will be transmitted from the first end 222a of the second secondary coil 222 to the input end of the first spark plug 110 and the input end of the second spark plug 120 respectively, and from the second end 222b of the second secondary coil 222 to the input end of the first spark plug 110, thereby making the first spark plug 110 and the second spark plug 120 both in the ignition state again. In the process of the first primary coil 211 and the second primary coil 221 controlling the ignition of the first spark plug 110, the current changes of the NPN transistor 40 corresponding to the first primary coil 211, the NPN transistor 40 corresponding to the second primary coil 221, the first primary coil 211, the second primary coil 221 and the first spark plug 110 are as follows: Figure 3 shown.

[0095] It should be noted that compared with ordinary ignition methods, this ignition method can control the first primary coil 211 and the second primary coil 221 to charge and discharge multiple times within a single engine cycle, thereby making the first spark plug 110 and the second spark plug 120 in the ignition state multiple times, thereby improving the ignition capability.

[0096] Furthermore, this embodiment also provides an ignition method for a gasoline engine, in which in step S1, the state information is a position of a first piston in a first cylinder relative to the first cylinder, and a position of a second piston in a second cylinder relative to the second cylinder;

[0097] The ignition condition is that the first piston of the first cylinder is at the top dead center of the compression stroke, and the second piston of the second cylinder is at the top dead center of the exhaust stroke.

[0098] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An ignition system for a gasoline engine, the gasoline engine comprising at least two cylinder groups, each of the cylinder groups comprising a first cylinder and a second cylinder, and when the first cylinder is at the top dead center of the compression stroke, the second cylinder is at the top dead center of the exhaust stroke; characterized in that: The ignition system comprises at least two spark plug groups and at least two ignition coil groups arranged in one-to-one correspondence with the at least two spark plug groups, and the at least two spark plug groups are arranged in one-to-one correspondence with the at least two cylinder groups; each of the spark plug groups comprises a first spark plug and a second spark plug, and the first spark plug and the second spark plug are respectively arranged on the first cylinder and the second cylinder in the corresponding cylinder group; Each of the ignition coil groups includes a first ignition coil and a second ignition coil, the first ignition coil includes a first primary coil, a first secondary coil and a first core, and the second ignition coil includes a second primary coil, a second secondary coil and a second core; the first primary coil and the first secondary coil are respectively wound around the first core, and the second primary coil and the second secondary coil are respectively wound around the second core; the first end and the second end of the first secondary coil are respectively electrically connected to the first end and the second end of the second secondary coil, and the first end of the first secondary coil is electrically connected to the input end of the first spark plug through the second secondary coil, and the first end of the first secondary coil is electrically connected to the input end of the second spark plug, and the second end of the first secondary coil is electrically connected to the input end of the first spark plug; the first end of the second secondary coil is electrically connected to the input end of the first spark plug through the first secondary coil, and the first end of the second secondary coil is electrically connected to the input end of the second spark plug; the second end of the second secondary coil is electrically connected to the input end of the first spark plug.

2. The ignition system for a gasoline engine according to claim 1, characterized in that: A first unidirectional control element is provided on the second end of the first secondary coil, and a second unidirectional control element is provided on the second end of the second secondary coil; and an input end of the first unidirectional control element is electrically connected to the second end of the first secondary coil, and an output end of the first unidirectional control element is electrically connected to an input end of the first spark plug; an input end of the second unidirectional control element is electrically connected to the second end of the second secondary coil, and an output end of the second unidirectional control element is electrically connected to an input end of the first spark plug.

3. The ignition system for a gasoline engine as claimed in claim 2, characterized in that: The ignition system also includes at least four ignition switches, a control device and a first energy supply device; each of the first primary coils and each of the second primary coils is electrically connected to one of the ignition switches; the first energy supply device is electrically connected to each of the first ignition coils and each of the second ignition coils; the signal output end of the control device is communicatively connected to the signal input end of each of the ignition switches.

4. The ignition system for a gasoline engine as claimed in claim 3, characterized in that: The ignition system also includes a second energy supply device; the control device includes a vehicle controller and a control unit arranged on each of the ignition switches, the signal output end of the vehicle controller is communicatively connected to the signal input end of each of the control units, and each of the control units is electrically connected to the second energy supply device.

5. The ignition system for a gasoline engine as claimed in claim 4, characterized in that: The ignition switch includes an NPN transistor; one end of each of the first primary coil and each of the second primary coil is electrically connected to the positive pole of the first energy supply device, and the other end is electrically connected to the collector of different NPN transistors, and the emitter of each NPN transistor is electrically connected to the negative pole of the first energy supply device; the base of each NPN transistor is electrically connected to different control units.

6. The ignition system for a gasoline engine as claimed in claim 5, characterized in that: A resistor element is provided between the base of each NPN transistor and each control unit, and an input end of the resistor element is electrically connected to the control unit, and an output end of the resistor element is electrically connected to an input end of the base of the NPN transistor.

7. The ignition system for a gasoline engine as claimed in claim 6, characterized in that: The gasoline engine includes two cylinder groups, the ignition system includes two spark plug groups, two ignition coil groups and four ignition switches; and the first one-way control element and the second one-way control element are both configured as diodes.

8. A gasoline engine, characterized in that: The invention comprises an ignition system for a gasoline engine as claimed in any one of claims 1 to 7.

9. An ignition method for a gasoline engine, characterized in that: The ignition method performs an ignition process by using an ignition system for a gasoline engine according to any one of claims 1 to 7, and the specific steps are as follows: S1: acquiring status information of each cylinder group in real time, and controlling the first primary coil and the second primary coil to be in a charging state; S2: judging whether the first cylinder and the second cylinder meet the ignition condition according to the state information; If yes, execute step S3; If not, continue to execute step S1; S3: Control the first primary coil to be in a discharge state, and control the second primary coil to be in a discharge state after maintaining the state for a preset time.

10. The ignition method for a gasoline engine according to claim 9, characterized in that: In the step S1, the state information is the position of the first piston in the first cylinder relative to the first cylinder, and the position of the second piston in the second cylinder relative to the second cylinder; The ignition condition is that the first piston of the first cylinder is at a top dead center of a compression stroke, and the second piston of the second cylinder is at a top dead center of an exhaust stroke.

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