Mazda Motor has been granted a patent for an engine system that includes a main combustion chamber, a subchamber, and a control device. The system adjusts fuel injection timing and ignition timing based on engine speed and load conditions, resulting in improved performance and efficiency. GlobalData’s report on Mazda Motor gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Mazda Motor, collision avoidance system was a key innovation area identified from patents. Mazda Motor's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Patent granted for engine system with optimized ignition timing
A recently granted patent (Publication Number: US11686243B2) describes an engine system that aims to improve fuel efficiency and reduce emissions. The system includes a cylinder block, a cylinder head, and a piston that form a cylinder. Within this cylinder, there is a main combustion chamber and a subchamber separated by a partition. The main combustion chamber is where fuel is injected and ignited by a main spark plug, while the subchamber is ignited by a subspark plug.
The engine system also features a control device that is connected to and controls the injector, main spark plug, and subspark plug. When the engine operates in a specific range of low engine speed and high engine load, the control device adjusts the fuel injection timing to occur during the compression stroke. Additionally, the main spark plug and subspark plug are controlled to ignite the mixture gas after the fuel injection timing.
In conditions where the engine load is the same but the engine speeds differ, such as low-speed and high-speed conditions, the control device further adjusts the fuel injection timing. Specifically, the fuel injection timing under the low-speed condition is delayed compared to the high-speed condition. The control device also sets the subignition timing, which is the ignition timing of the subspark plug, to occur on the retarding side of the main ignition timing, with a larger ignition phase difference under the low-speed condition compared to the high-speed condition.
The control device also sets the main ignition timing and subignition timing in the specific range to occur during the expansion stroke. Furthermore, the control device adjusts the ignition phase difference to increase as the engine speed decreases, with a larger rate of change on the high-speed side compared to the low-speed side.
The positioning of the main spark plug and subspark plug is also specified in the patent. The main spark plug is attached with its electrode part located on the intake port side of the main combustion chamber's ceiling surface, while the subspark plug is attached on the exhaust port side. The injector is positioned at the center of the ceiling surface of the main combustion chamber.
Overall, this patented engine system aims to optimize fuel injection and ignition timing based on engine speed and load conditions, leading to improved fuel efficiency and reduced emissions.
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