Not only the maximum output torque, the effective power and the maximum speed, the engine with in-cylinder direct injection is almost on par with the engine with electronic injection, that is to say, in terms of the most important dynamic index of the engine, the in-cylinder direct injection engine obtained by the experimental results is not superior at all!

Even compared to the carburetor injection engine, the engine with direct injection in the cylinder has only a slight advantage.

Not only that, in terms of economic indicators, that is, the effective fuel consumption rate of the engine, the direct injection engine in the cylinder is only slightly ahead of the carburetor injection and electronic injection engine!

If it is really according to the results of this experiment, the advantages of in-cylinder direct injection in power and fuel economy advertised by Zhou Jingming in the paper are completely untenable!

Royce on the side saw that Zhou Jingming did not speak, and was just about to step forward to ask, but the person in charge of this experiment walked up to him and whispered a few words in his ear, and Royce's face changed instantly.

Obviously, the Bosch experimenters also knew that this experiment was a failure!

However, Royce quickly adjusted his mood, like this kind of car experiment, the first failure is normal, and it is rare to succeed once, find the reason, adjust and do it again. However, he is not an expert in this area after all, so he has been waiting for Zhou Jingming to speak.

After confirming that the data was correct, Zhou Jingming walked to the bench again, checked the parameters of the experimental equipment one by one, and then adjusted it according to the deviation direction of the experimental data.

"Do it all over again. After adjusting the parameters, Zhou Jingming said in German.

Royce nodded to the person in charge of the experiment, and after receiving Royce's instructions, the person in charge stepped forward and told a few experimenters, and the whole machine experiment began again!

Soon, the experimental data was sent to Zhou Jingming again, but the results were still unsatisfactory, and the main performance indicators, direct injection in the cylinder, could not show its advantages at all!

"What went wrong, why did the experimental data look like this?" After two consecutive failed experiments, Royce was also a little anxious, and couldn't help but step forward and ask.

If you can't even pass the experimental stage of the whole machine, then the next loading test and mass production will not be talked about, although the patent fee of 20 million is nothing for Bosch, but it will affect Royce's performance and directly related to his subsequent promotion!

"The specific reason is not known for the time being, and it should not be a design problem. Zhou Jingming stared at the data in his hand and frowned.

"It's not a design problem, so how can it be like this?" Royce continued.

"Don't worry, Mr. Royce, I guarantee that the technology of direct injection in the cylinder is mature and commercially valuable, and I will find out the cause and solve it perfectly. Zhou Jingming couldn't see Royce's worries, so he could only smile and sigh with relief.

After more than ten years of practical verification, this technology itself must not have any problems, if it is not a design reason, it must be a factor in production.

"Please help me, I want to do an experiment on the external characteristics of the engine. After thinking for a while, Zhou Jingming said again. He wanted to analyze the external characteristic curve of the engine.

With the assistance of several experimenters, Zhou Jingming obtained the relevant data and successfully drew the external characteristic curve of the in-cylinder direct injection engine and the external characteristic curve of the other two engines.

But just from the curve, Zhou Jingming still can't get any clues, the time will soon be in the evening, after eating, Zhou Jingming returned to the hotel, the table is also full of various information, no matter what the factor, Zhou Jingming must find and then give a plan, otherwise it will definitely affect his follow-up business plan.

"How is it, still have no clue?" Wang Yuanchao took a glass of water and put it in front of Zhou Jingming, and asked with concern.

Zhou Jingming took a sip of water, and then shook his head bitterly, "Not yet." ”

"Could it be because the engine carried in the experiment does not meet the technical requirements for direct injection in the cylinder?" Wang Yuanchao said with some uncertainty. He remembered that Zhou Jingming said that the engine with direct injection in the cylinder has special requirements for the cylinder block and combustion chamber.

As soon as Wang Yuanchao said this, he immediately reminded Zhou Jingming that Royce said that the engine carried in this experiment is an engine currently produced by Bosch, although it has undergone a certain amount of restructuring, but it is definitely not comparable to a special in-cylinder direct injection engine!

"Third brother, what you said makes sense, it must be this factor!" Zhou Jingming said excitedly.

It is estimated that now Royce and they are also asleep, and the specific parameters of the engine used in the test, Zhou Jingming can only wait for tomorrow morning to get it, plus this day is all high-intensity mental work, Zhou Jingming simply rested first.

The next morning, Zhou Jingming got the specific parameters of the engine from Royce, and after some comparative analysis, Zhou Jingming finally found out what the specific reason for the failure of the experiment was!

As Wang Yuanchao said, this engine used for experiments does not meet the technical requirements of direct injection in the cylinder in several parameters, which is prominently reflected in the compression ratio and air-fuel ratio of the engine!

The compression ratio of direct injection in the cylinder can generally reach 11 to 14, but when the reform is carried out, the experimenter still retains the original compression ratio of this engine, and the compression ratio of this engine is only 7, so that the compression ratio directly leads to the dynamic can not be fully exerted, which is reflected in the experimental data, that is, there is no absolute advantage in power performance.

The fuel economy is completely subject to the air-fuel ratio of the engine does not meet the requirements of direct injection in the cylinder, the combustion chamber of the normal direct injection engine should show a gradient distribution, using the mode of layered combustion, it is obvious that the combustion chamber for the experimental engine does not meet the requirements.

In other words, Bosch failed in the preparation phase of the experiment, which led to the unsatisfactory results of the final experiment.

After finding the reason, Zhou Jingming explained the reason to Royce as soon as possible.

"The cylinder block and combustion chamber of the engine still have to be specially manufactured, and you can't just take an engine and use it for experiments, otherwise the follow-up results will still be unsatisfactory. Zhou Jingming said solemnly.

"If you say so, then we need to re-prototype the engine for the test. Royce frowned, "If that's the case, the next experiment will probably have to wait a while." ”

"How long will it take?" asked Zhou Jingming.

"At least a week, although you gave us the drawings, it will take some time to adjust the machine, and it will definitely take a week when it is fully produced and assembled. Royce replied.

"If that's the case, then I'll probably have to go back home first. Zhou Jingming looked at Royce and said.

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