Engine ignition circuit, vehicle and ignition control method

Abstract

The present invention provides an engine ignition circuit, a vehicle and an ignition control method. The engine ignition circuit provided by the present invention comprises: at least two groups of ignition coils, which are arranged in the target cylinder; an ignition control circuit, which is connected to the at least two groups of ignition coils, and is used to provide the same ignition control signal to the at least two groups of ignition coils at the same time. The technical solution of the embodiment of the present invention controls the signal input through a single-channel ignition control circuit, and controls the two-channel output at the same time to control the corresponding two groups of ignition coils to work at the same time, so that there are two ignition points during ignition, which ensures the ignition success rate, and can also make the fuel burn faster and more fully, the engine more powerful, and reduce emission pollution.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an engine ignition circuit, a vehicle and an ignition control method. Background Art

[0002] In existing vehicles, each cylinder is equipped with a set of ignition coils to control the ignition of the cylinder. This method has a single ignition point and it is difficult to increase the ignition energy in a leapfrog manner. If the single ignition energy of the ignition coil is continued to be increased on the existing basis, the heating of the IGBT (Insulate-Gate Bipolar Transistor) and the ignition coil will become very serious. The increased operating temperature will reduce the life of the IGBT and the ignition coil. Summary of the invention

[0003] The embodiment of the present invention provides an engine ignition circuit, a vehicle and an ignition control method to improve the ignition effect of the vehicle.

[0004] To solve the above problems, the present invention is achieved as follows:

[0005] In a first aspect, an embodiment of the present invention provides an engine ignition circuit, which is applied to an engine of a vehicle, wherein the engine includes a plurality of cylinders, the plurality of cylinders includes a target cylinder, and the engine ignition circuit corresponding to the target cylinder includes:

[0006] at least two sets of ignition coils, disposed in the target cylinder;

[0007] The ignition control circuit is connected to the at least two groups of ignition coils and is used to provide the same ignition control signal to the at least two groups of ignition coils at the same time.

[0008] In some embodiments, the ignition control circuit includes:

[0009] A control signal input circuit is connected to the electronic control unit ECU of the vehicle to obtain an ignition signal;

[0010] A micro control unit MCU is connected to the control signal input circuit and is used to generate an ignition control signal according to the ignition signal;

[0011] A primary circuit, connected to the MCU, for detecting and controlling the primary current of the ignition coil;

[0012] The secondary circuit is connected to the MCU and is used to obtain the voltage of the secondary current signal of the ignition coil and control the energy of the secondary current signal of the ignition coil with multiple ignition control signal inputs.

[0013] In a second aspect, an embodiment of the present invention provides a vehicle, comprising an engine and the engine ignition circuit described in any one of the first aspects.

[0014] In a third aspect, an embodiment of the present invention provides an ignition control method, which is applied to the vehicle according to the second aspect, and the method includes:

[0015] Get the vehicle's ignition signal;

[0016] generating at least two synchronous ignition control signals according to the ignition signal;

[0017] The ignition control signal is sent to at least two groups of ignition coils corresponding to the target cylinders simultaneously to control the at least two groups of ignition coils corresponding to the target cylinders to ignite simultaneously.

[0018] In some of the embodiments, when the operating temperature of the engine is greater than a preset temperature threshold, the ignition control signal is a single ignition control signal;

[0019] When the operating temperature of the engine is not greater than a preset temperature threshold, the ignition control signal is a multiple ignition control signal.

[0020] In some embodiments, the preset temperature threshold ranges from 40 to 55 degrees Celsius.

[0021] In some embodiments, before generating at least two synchronous ignition control signals according to the ignition signal, the method further includes:

[0022] The temperature of the coolant of the vehicle is detected as the operating temperature of the engine of the vehicle.

[0023] In a fourth aspect, an embodiment of the present invention provides a vehicle configured to execute any one of the methods described in the third aspect.

[0024] The engine ignition circuit provided by the embodiment of the present invention comprises: at least two groups of ignition coils, which are arranged in the target cylinder; and an ignition control circuit, which is connected to the at least two groups of ignition coils and is used to provide the same ignition control signal to the at least two groups of ignition coils at the same time. The technical solution of the embodiment of the present invention controls the signal input through a single-channel ignition control circuit, and controls the two-channel output at the same time, so as to control the corresponding two groups of ignition coils to work at the same time, so that there are two ignition points during ignition, which ensures the ignition success rate, and can also make the fuel burn faster and more fully, make the engine more powerful, and reduce emission pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0026] Figure 1 is a circuit diagram of an engine ignition circuit in one embodiment of the present invention;

[0027] Figure 2 is a control timing diagram of a single ignition in one embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of a single ignition process in one embodiment of the present invention;

[0029] Figure 4 is a control timing diagram of multiple ignitions in one embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of the process of multiple ignitions in one embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The terms "first", "second" etc. in the embodiments of the present invention are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. In addition, the terms "include" and "have" and any variation thereof are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment. In addition, "and / or" is used in the present application to represent at least one of the connected objects, such as A and / or B and / or C, which represents 7 situations including single A, single B, single C, and A and B all exist, B and C all exist, A and C all exist, and A, B and C all exist.

[0033] An embodiment of the present invention provides an engine ignition circuit, which is applied to an engine of a vehicle. The engine includes a plurality of cylinders, and the plurality of cylinders includes a target cylinder.

[0034] like Figure 1As shown, in some of the embodiments, the engine ignition circuit corresponding to the target cylinder includes an ignition control circuit and at least two groups of ignition coils, wherein the ignition coil is arranged in the target cylinder, the ignition control circuit is connected to the two groups of ignition coils, and is used to provide the same ignition control signal to the at least two groups of ignition coils at the same time.

[0035] An embodiment of the present invention provides an ignition control method, which can be applied to any engine ignition circuit or vehicle in the embodiment of the present invention.

[0036] In some embodiments, the method includes:

[0037] Get the vehicle's ignition signal;

[0038] generating at least two synchronous ignition control signals according to the ignition signal;

[0039] The ignition control signal is sent to at least two groups of ignition coils corresponding to the target cylinders simultaneously to control the at least two groups of ignition coils corresponding to the target cylinders to ignite simultaneously.

[0040] In the technical solution of this embodiment, the ignition signal comes from the vehicle's electronic control unit ECU.

[0041] Please continue reading Figure 1 In some embodiments, the ignition control circuit includes a control signal input circuit, which is connected to the ECU to obtain an ignition signal. In other words, the control signal input circuit is used to pre-process the ignition signal from the ECU. The control signal input circuit receives the signal provided by the ECU and inputs it to the MCU for detection and judgment after filtering, shaping and conversion. R9 and C3 constitute an RC filter circuit, which filters the signal input by the ECU and inputs it to the single-chip microcomputer. R10 is an impedance matching resistor, and D2 is a protective voltage-stabilizing diode to absorb the interference voltage brought by the control signal end.

[0042] like Figure 1 As shown, the ignition control circuit also includes a microcontroller unit MCU, which is connected to the control signal input circuit. After the control signal input circuit pre-processes the ignition signal, it sends the pre-processed signal to the MCU, and the MCU receives the ignition signal to generate an ignition control signal. Among them, R8 and C form a single-chip reset circuit, and R7, D1, and C1 form a single-chip system voltage stabilization circuit.

[0043] like Figure 1 As shown, the ignition control circuit also includes a primary circuit and a secondary circuit.

[0044] The primary circuit is connected to the MCU and is used to detect and control the primary current of the ignition coil; the primary circuit includes an IGBT and a primary current sampling circuit. R2, R3 and R5, R6 are two groups of IGBT current sampling circuits, and R1 and R4 are IGBT switch speed control matching resistors.

[0045] The secondary circuit is connected to the MCU and is used for the voltage of the secondary current signal of the ignition coil and the energy of the secondary current signal of the ignition coil with multiple ignition control signal inputs. R12, R14 and R11, R13 are two sets of coil secondary sampling circuits respectively, and the cathodes of the high-voltage diodes of the two sets of coils are connected to ports HV1 and HV2 respectively.

[0046] The ignition control signals generated by the MCU are multi-channel. Taking two ignition coils arranged in the target cylinder as an example, the MCU generates two ignition control signals accordingly, and the two signals are synchronized.

[0047] When the target cylinder is ignited, the two ignition coils in the target cylinder work at the same time, and the ignition control signals that control the operation of the two ignition coils are synchronized. In this way, when the target cylinder is ignited, two ignition coils ignite at the same time, which solves the problem of insufficient ignition energy of a single ignition coil and relatively high risk of ignition failure at a single point. In addition, there are two ignition points in the target cylinder, which, on the one hand, doubly guarantee the ignition success rate, and on the other hand, the two ignition points can make gasoline burn faster and more fully, make the engine more powerful, and reduce emission pollution.

[0048] In some of the embodiments, when the operating temperature of the engine is greater than a preset temperature threshold, the ignition control signal is a single ignition control signal;

[0049] When the operating temperature of the engine is not greater than a preset temperature threshold, the ignition control signal is a multiple ignition control signal.

[0050] In some of the embodiments, the MCU receives the pre-processed ECU signal, further determines whether the control signal is a single ignition or multiple ignitions, and then outputs a corresponding ignition control signal according to the determination result.

[0051] like Figure 2 and Figure 3 As shown, specifically, when it is determined that the ECU signal is a single ignition, at least two groups of ignition coils are controlled to ignite normally; Figure 4 and Figure 5 As shown, if it is determined that the ECU signal is multiple ignitions, at least two groups of ignition coils are controlled to continuously perform multiple ignition operations within the multiple ignition time after a single ignition is completed, until the multiple ignition signals are turned off or the protection time is exceeded.

[0052] In the technical solution of this embodiment, multiple ignitions are mainly aimed at low-temperature starting conditions. During low-temperature starting, multiple ignition functions are performed by at least two groups of ignition coils, which can further improve the energy of the ignition coils and ensure the success rate and stability of cold starts. During low-temperature starting, multiple ignition functions can be triggered, which can further greatly improve the energy of the ignition coils and ensure the success rate and stability of cold starts.

[0053] When the car is hot, a single ignition is performed through at least two sets of ignition coils, which can reduce the heat generated by the IGBT and the ignition coil and increase the product life.

[0054] In this way, the embodiment of the present invention can intelligently adjust the ignition working logic according to different working conditions, effectively reduce the workload of IGBT and coil, and increase the service life of the ignition coil assembly while ensuring the ignition success rate, power stability, and reduced emission pollution.

[0055] In some embodiments, before generating at least two synchronous ignition control signals according to the ignition signal, the method further includes:

[0056] The temperature of the coolant of the vehicle is detected as the operating temperature of the engine of the vehicle.

[0057] In some of the embodiments, whether the vehicle is in a hot car state or a low temperature start state is determined based on the temperature of the vehicle's coolant. In one of the embodiments, the preset temperature threshold ranges from 40 to 55 degrees Celsius.

[0058] In one embodiment, the preset temperature threshold is 50 degrees Celsius for exemplary description.

[0059] That is, when the temperature of the coolant of the vehicle is greater than 50 degrees Celsius, the ignition control signal is a single ignition control signal; when the temperature of the coolant of the vehicle is not greater than 50 degrees Celsius, the ignition control signal is a multiple ignition control signal.

[0060] In some of the embodiments, after the ECU determines that the startup state is a low-temperature startup or a hot car startup, it further sends an ignition signal to the MCU, and the MCU determines whether it is a single ignition or multiple ignitions by detecting the input level of the ECU.

[0061] like Figure 4 As shown, in one embodiment, whether multiple ignitions are required is determined by detecting the time interval T2 between the falling edge and the next rising edge of the pulse of the ignition signal.

[0062] Specifically, when the time interval T2 is within the set duration interval, it is determined as multiple ignitions, otherwise it is determined as single ignition. In an exemplary embodiment, when the time interval T2 is 20-280 microseconds, it is determined as multiple ignitions, otherwise it is determined as single ignition.

[0063] like Figure 2 and Figure 3 As shown, during single ignition, when the rising edge of the ignition signal is detected, the two ignition control signals are controlled to be output simultaneously, and when the falling edge of the ignition signal is detected, the output of the two ignition control signals is stopped.

[0064] According to the test, when the control instructions are sent synchronously, due to errors caused by hardware conditions, the actual opening and closing time error of the signal is 0.24 microseconds. Compared with the total ignition duration of about 1 millisecond, the error is about 0.025%, which is extremely small. It can be considered that the two ignition control signals are carried out synchronously.

[0065] like Figure 4 and Figure 5 As shown, when multiple ignitions are required, the voltages of the secondary current signals of the two groups of ignition coils are first read. When the voltage of the secondary current signals of the first group of ignition coils reaches a threshold value, the group of ignition coils is controlled to turn on the output state to perform the ignition operation. If the threshold value is not reached, the first group of ignition coils does not turn on the output state to perform the ignition operation. Next, the electrical ignition process of the second group of ignition coils is controlled with reference to the above process, and after the control is completed, the delay interference is eliminated.

[0066] Next, the primary circuits of the two ignition coils are read in sequence. When the primary circuit of each coil reaches a threshold, the output of the ignition coil is turned off, and after the primary current of the two ignition coils is detected, the delay interference elimination operation is performed.

[0067] In this way, the above process is iteratively executed in sequence, the voltage and signal level of the primary current and secondary current signals are continuously detected, and the ignition time and the number of ignitions are controlled according to the detection results until multiple ignition operations are completed.

[0068] It uses a single control signal input to control two outputs at the same time, corresponding to two sets of ignition coils working at the same time. The single control signal can ensure strict synchronization of ignition timing. Two sets of ignition coils are installed on the same engine cylinder. When igniting, there are two ignition points. On the one hand, the ignition success rate is double guaranteed. On the other hand, the two ignition points can make gasoline burn faster and more fully, the engine power is stronger, and emission pollution is reduced.

[0069] An embodiment of the present invention provides a vehicle, comprising an engine and any one of the above-mentioned engine ignition circuits, wherein the vehicle is configured to execute any one of the above-mentioned methods when ignited.

[0070] This embodiment includes all the technical solutions of the above embodiments, and thus can at least achieve all the above technical effects, which will not be described in detail here.

[0071] The above is a preferred implementation of the embodiment of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present disclosure. These improvements and modifications should also be regarded as the scope of protection of the present disclosure.

Claims

1. An engine ignition circuit, applied to a vehicle engine, the engine comprising a plurality of cylinders, characterized in that: The plurality of cylinders include a target cylinder, and the engine ignition circuit corresponding to the target cylinder includes: at least two sets of ignition coils, disposed in the target cylinder; The ignition control circuit is connected to the at least two groups of ignition coils and is used to provide the same ignition control signal to the at least two groups of ignition coils at the same time.

2. The engine ignition circuit according to claim 1, characterized in that: The ignition control circuit comprises: A control signal input circuit is connected to the electronic control unit ECU of the vehicle to obtain an ignition signal; A micro control unit MCU is connected to the control signal input circuit and is used to generate an ignition control signal according to the ignition signal; A primary circuit, connected to the MCU, for detecting and controlling the primary current of the ignition coil; The secondary circuit is connected to the MCU and is used to obtain the voltage of the secondary current signal of the ignition coil and control the energy of the secondary current signal of the ignition coil with multiple ignition control signal inputs.

3. A vehicle, characterized in that: The invention comprises an engine and the engine ignition circuit according to any one of claims 1 to 2.

4. An ignition control method, applied to the vehicle according to claim 3, characterized in that: The method comprises: Get the vehicle's ignition signal; generating at least two synchronous ignition control signals according to the ignition signal; The ignition control signal is sent to at least two groups of ignition coils corresponding to the target cylinders simultaneously to control the at least two groups of ignition coils corresponding to the target cylinders to ignite simultaneously.

5. The method according to claim 4, characterized in that When the operating temperature of the engine is greater than a preset temperature threshold, the ignition control signal is a single ignition control signal; When the operating temperature of the engine is not greater than a preset temperature threshold, the ignition control signal is a multiple ignition control signal.

6. The method according to claim 5, characterized in that The preset temperature threshold ranges from 40 to 55 degrees Celsius.

7. The method according to claim 5 or 6, characterized in that Before generating at least two synchronous ignition control signals according to the ignition signal, the method further includes: The temperature of the coolant of the vehicle is detected as the operating temperature of the engine of the vehicle.

8. A vehicle, characterized in that: The vehicle is configured to perform the method of any one of claims 5 to 7.

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