CN-122029350-A - Control device for spark ignition type hydrogen engine and control method for spark ignition type hydrogen engine

Abstract

As a control device for a spark ignition type hydrogen engine, an ignition signal for main discharge for igniting a hydrogen mixture and an ignition signal for sub-discharge for making the open circuit voltage of a secondary coil in an intake stroke lower than the open circuit voltage at the end of the main discharge are sent to an igniter of the ignition device. Thus, the open circuit voltage of the intake stroke is set to the minimum value of the dielectric breakdown voltage in the spark ignition type hydrogen engine, and backfire of the engine is prevented.

Inventors

• SUKEGAWA YOSHIHIRO
• FUJIYAMA YUKIO
• Neishi Yiwen
• Kozhu Ryutaro
• OKUTA YUKI

Assignees

• 安斯泰莫阪神株式会社

Dates

Publication Date

20260512

Application Date

20241001

Priority Date

20231030

Claims (13)

1. 1. A control device for a spark ignition type hydrogen engine, comprising: An ignition coil that generates a high voltage by switching off a current flowing through the primary coil; An igniter for turning on and off a current flowing through the primary coil; a spark plug connected to the secondary coil for generating spark discharge and disposing an electrode in the combustion chamber, and A control device which transmits an ignition signal to the igniter, The control device sends the following ignition signals to the igniter: An ignition signal of a main discharge for igniting the hydrogen mixture in the combustion chamber, and And an ignition signal for sub-discharge for making the voltage of the secondary coil lower than the voltage of the secondary coil at the end of the main discharge in an intake stroke.
2. 2. The control device for a spark-ignition hydrogen engine according to claim 1, characterized in that, The voltage of the secondary coil in the intake stroke is set to 1kV or less.
3. 3. The control device for a spark-ignition hydrogen engine according to claim 2, wherein, The timing at which the ignition signal of the sub-discharge is switched from on to off is set to a range from 60 ° crank angle after compression top dead center to exhaust valve opening timing +10° crank angle.
4. 4. The control device for a spark-ignition hydrogen engine according to claim 2, wherein, The on period of the ignition signal of the sub-discharge is set to 5% or more with respect to the on period of the ignition signal of the main discharge.
5. 5. The control device for a spark-ignition hydrogen engine according to claim 4, wherein, The on period of the ignition signal of the sub-discharge is set to 40% or less relative to the on period of the ignition signal of the main discharge.
6. 6. The control device for a spark-ignition hydrogen engine according to claim 2, wherein, And switching transmission and avoidance of the ignition signal of the sub-discharge to the igniter based on an engine state or an environmental state.
7. 7. The control device for a spark-ignition hydrogen engine according to claim 6, wherein, And switching transmission and avoidance of the ignition signal of the sub-discharge to the igniter based on load information of the engine.
8. 8. The control device for a spark-ignition hydrogen engine according to claim 6, wherein, The transmission and avoidance of the auxiliary discharge ignition signal to the igniter are switched based on at least one of a load factor of the engine, a throttle opening, a torque, an engine rotational speed, an intake air pressure, a cylinder internal pressure, an intake air amount, an exhaust gas flow rate, a fuel flow rate, an accelerator opening, a load output, an exhaust gas temperature, a cooling water amount, a water temperature, and an oil temperature.
9. 9. The control device for a spark-ignition hydrogen engine according to claim 8, wherein, When at least one of a load factor of an engine, a throttle opening, a torque, an engine rotation speed, an intake pressure, an in-cylinder pressure, an intake air amount, an exhaust gas flow rate, a fuel flow rate, an accelerator opening, a load output, an exhaust gas temperature, a cooling water amount, a water temperature, or an oil temperature is smaller than a predetermined value, an ignition signal for transmitting the sub-discharge to the igniter is implemented, When at least one of a load factor of an engine, a throttle opening, a torque, an engine rotation speed, an intake pressure, an in-cylinder pressure, an intake air amount, an exhaust gas flow rate, a fuel flow rate, an accelerator opening, a load output, an exhaust gas temperature, a cooling water amount, a water temperature, or an oil temperature is not less than a predetermined value, the transmission of an ignition signal of the sub discharge to the igniter is avoided.
10. 10. The control device for a spark-ignition hydrogen engine according to claim 6, wherein, And switching the transmission and avoidance of the ignition signal of the sub-discharge to the igniter based on the hydrogen ratio of the fuel.
11. 11. The control device for a spark-ignition hydrogen engine according to claim 10, characterized in that, When the hydrogen ratio of the fuel is greater than a predetermined value, an ignition signal for transmitting the sub-discharge to the igniter is executed, and when the hydrogen ratio of the fuel is not greater than the predetermined value, the ignition signal for transmitting the sub-discharge to the igniter is avoided.
12. 12. The control device for a spark-ignition hydrogen engine according to claim 6, wherein, When the ignition signal of the sub-discharge is transmitted to the igniter, the on period of the ignition signal of the main discharge is shortened as compared with the case where the ignition signal of the sub-discharge is avoided from being transmitted to the igniter.
13. 13. A method for controlling a spark ignition hydrogen engine, the spark ignition hydrogen engine comprising: An ignition coil that generates a high voltage by switching off a current flowing through the primary coil; an igniter for turning on and off the current flowing through the primary coil, and A spark plug connected to the secondary coil for generating spark discharge, and an electrode disposed in the combustion chamber, The control method of the spark ignition type hydrogen engine is characterized in that, Providing the igniter with the following ignition signals: An ignition signal of a main discharge for igniting the hydrogen mixture in the combustion chamber, and And an ignition signal for sub-discharge for making the voltage of the secondary coil lower than the voltage of the secondary coil at the end of the main discharge in an intake stroke.

Description

Control device for spark ignition type hydrogen engine and control method for spark ignition type hydrogen engine Technical Field The present invention relates to a control device for a spark ignition hydrogen engine and a control method for a spark ignition hydrogen engine. Background In a spark ignition type hydrogen engine, spark discharge may occur at unexpected timing in a spark plug gap portion due to residual energy of an ignition coil and a high open circuit voltage, and a hydrogen mixture may be ignited at unexpected timing. This ignition may cause flashback (back fire) which may cause serious damage to the intake system components of the engine. Regarding this problem, patent document 1 discloses an ignition device that prevents spark discharge caused by residual energy of an ignition coil by returning the residual energy of the ignition coil to a power supply. Prior art literature Patent literature Patent document 1 WO2022/128603A1 Disclosure of Invention Problems to be solved by the invention In the ignition device described in patent document 1, a bypass resistor element is provided between the primary side and the secondary side of the ignition coil, and a circuit for returning residual energy on the secondary side of the ignition coil to a power supply is configured. However, if a shunt resistor element is provided on the ignition coil as in the ignition device described in patent document 1, there is a problem in that the manufacturing cost of the ignition coil increases. Further, if a shunt resistor is provided on the ignition coil as in the ignition device described in patent document 1, a positive voltage (on voltage) is generated on the secondary side of the ignition coil when the ignition coil is charged, and this positive voltage may cause unexpected spark discharge. The invention provides a control device and a control method for a spark ignition type hydrogen engine, which can prevent the backfire of the engine caused by unexpected spark discharge of a spark plug at low cost without generating positive voltage when an ignition coil is charged. Means for solving the problems In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-mentioned problems, and in one example thereof, the control device for a spark ignition type hydrogen engine according to the present application includes an ignition coil for generating a high voltage in a secondary coil by cutting off a current flowing through a primary coil, an igniter for conducting and cutting off a current flowing through the primary coil, and a spark plug connected to the secondary coil for generating spark discharge and disposing an electrode in a combustion chamber. And a control device for transmitting an ignition signal to the igniter. The control device transmits an ignition signal for main discharge for igniting the hydrogen mixture in the combustion chamber and an ignition signal for sub-discharge for making the voltage of the secondary coil in the intake stroke lower than the voltage of the secondary coil at the end of discharge to the igniter. ADVANTAGEOUS EFFECTS OF INVENTION According to the present invention, no positive voltage is generated at the time of charging the ignition coil, and backfire of the engine caused by unexpected spark discharge of the spark plug can be prevented at low cost. The problems, configurations, and effects other than those described above will be apparent from the following description of the embodiment examples. Drawings Fig. 1 is a diagram showing an overall configuration example of a spark ignition hydrogen engine according to an embodiment of the present invention, and is a diagram showing an example of a configuration of a special combustion spark ignition hydrogen engine in which hydrogen and air are mixed and combusted. Fig. 2 is a diagram showing another configuration example of a spark ignition type hydrogen engine according to an embodiment of the present invention, and is a diagram showing a configuration example of a mixed combustion spark ignition type hydrogen engine in which hydrogen and fuel other than hydrogen are mixed and combusted. Fig. 3 is a block diagram showing a configuration example of a control unit (ECU) according to an embodiment of the present invention. Fig. 4 is a circuit diagram showing an exemplary configuration of an ignition device according to an embodiment of the present invention. Fig. 5 is an explanatory diagram showing the operation and action of the ignition control and ignition device 50 according to the related art, in which (a) is a diagram showing an ignition signal 59 transmitted from the ECU 2to the ignition device 50, (b) is a diagram showing a primary current flowing through the primary coil 52, (c) is a diagram showing electromagnetic energy accumulated in the primary coil 52 and the secondary coil 53, (d) is a diagram sho