After the vehicle started, after a while, someone began to organize the onlookers to persuade them to leave, so that they could go back and pack up and get ready for work. Now only the staff, experts and Jiang Chen are left, and these main cadres are left. And the real tests are only now underway, because this car involves not only commercial secrets, but also the future military field, so it is still necessary to carry out the necessary secrecy. There are many people on the scene, so it is beneficial to dispel unnecessary idle personnel to carry out confidentiality work.

First of all, of course, the car is not driven directly, but it is first sent to a comprehensive drum test bench for this test drive. This comprehensive drum test bench, also known as the drum type comprehensive test bench, is a set of vehicle braking performance testing and vehicle speedometer calibration as one of the testing equipment, in which the braking performance testing part is composed of motor, reducer, braking force detection device (force measuring lever, load sensor, reducer, box, etc.), drum, lifter, hydraulic lifting system and axle load sensor. When measuring the braking force of the wheels, the left and right wheels are placed between the two groups of rollers respectively, and the drums are driven to rotate by the motor through the guò reducer, thereby driving the wheels to rotate. When the vehicle brakes, the wheel tread will give a reaction moment to the drum surface, and through the drum and the reducer shaft, the reducer box and the force measuring lever rotate around the drum axis, and the force is transmitted to the load cell, so as to measure the braking force of the wheel.

The principle of vehicle speed measurement on the automobile comprehensive test bench is actually very simple, that is, the driving wheels of the real vehicle fall on the drum. The car starts, and the driving wheels rotate on the drum, simulating the actual conditions of road driving. The drum is driven by the drive wheels, and the speed sensor connected to it also rotates. Because there is basically no slippage between the tire and the drum when the drum rotates with the wheel, the linear speed of the drum is equal to the actual vehicle speed, and the speed sensor converts the speed value of the drum into a pulse of the corresponding frequency and inputs it into the secondary instrument.

"Are you ready?" Zhou Gong said to the driver of the car on the comprehensive drum test bench.

"Alright. The driver made an OK gesture outward.

"Good. Zhou Gong turned his head to look at everyone and said: "Come, all units, pay attention, the first test of the vehicle driving and performance test is now countdown, five, four, three, two, one, start." ”

As the driver in the vehicle put the gear, he let go of it and stepped lightly, and the vehicle started slowly. The operation sound of the gasoline engine is louder than that of the diesel engine, this is because the gasoline engine is ignited by high-voltage electricity, and the diesel engine is compressed by the engine, so the compression ratio of the diesel engine is larger than that of the gasoline engine, so the exhaust pressure is relatively large, and the engine sound is mainly reduced by the muffler, so it is normal for the diesel engine to be louder. Of course, in the ears of Jiang Chen and the others, this voice seemed even more powerful. It's like an angry beast, howling on the test bed at the moment.

Jiang Chen asked Zhou Gong next to him, "How is it, now the number of items is jù." ”

"It's normal at the moment and we're continuing to increase the pace. Zhou Gong said a word to Jiang Chen, and then continued to turn his head to work.

As for Jiang Chen, he didn't bother, but stood there and watched quietly. Although he understands some, in front of these experts, except for the advanced consciousness accident, he knows how to touch the fur of the rest, so it is better not to speak. And he also knows that what these researchers hate and fear the most is that they meet a boss who doesn't know how to pretend to understand, or a boss who knows a little bit about it, and loves to interfere with work. This made them disgusted and had to spend time to explain this qiē carefully. And Jiang Chen, who came out of this research position, could naturally understand this, and said that at this moment, he instinctively shut up.

The work was boring, and everyone was listening to the sound of the vehicle rubbing against the drum underneath and the sound of the engine running inside the vehicle. Although Jiang Chen and the others thought it was noise, to these researchers, it was a bit of a joke. Every noise has its own situation or number, and these scientific researchers are constantly listening to and observing the condition to record these numbers, while experts are constantly analyzing the number of things obtained from the vehicle, so as to obtain their useful information about the number of jù, so as to study or correct.

It was about ten o'clock, and Jiang Chen asked Liang Qi to contact the restaurant to get the breakfast, which was finally delivered. Because it was summer, Jiang Chen didn't let them get greasy things, a large pot of mung bean soup, a few baskets of steamed buns, and some refreshing side dishes. As a former R&D personnel, Jiang Chen knows that basically all R&D personnel don't have much idea of these details, basically just stuttering, it's good to be simple, it's so complicated, but I'm not used to it.

Sure enough, seeing that these experts and researchers all had a great appetite, they all laughed and chatted while eating. And Jiang Chen didn't care, he took 10,000 mung bean soup, sandwiched a bun, and squatted there to eat. Seeing this, Academician Zhang shouted at Jiang Chen, "Xiao Jiang, come here." ”

"What's the matter, Mr. Zhang. Jiang Chen walked over with a rice bowl and said with a smile.

Academician Zhang motioned for Jiang Chen to sit down, and then said with a smile: "What are you doing hiding over there, just eat with us here, there are still vegetables here, can you be full just by drinking that mung bean soup." ”

"Hehe, I'm eating over there. Jiang Chen said with a smile.

Here, Academician Tu glanced up at Jiang Chen and said, "What, I'm not happy to eat with a few of our old guys." ”

"Why, it's too late for me to be happy. Jiang Chen hurriedly said.

"Then eat here in peace. Wang Gong said to Jiang Chen: "Come on, come on, eat more, we can't eat much." Look at you, you are afraid that we will not have enough to eat, so we will get so much, you eat it quickly, and don't let it be wasted, this is all the blood and sweat of farmers. ”

"Hehe, good, good, I'll eat, I'll eat. Jiang Chen took a bun at Old Chief Wang, and then said with a smile: "Old Wang, how did we test in the morning." ”

"Hahahaha, I thought you could hold on for a while, but I didn't expect to ask so soon. Wang Gong joked with a smile.

"Hehe, I don't care either. Jiang Chen said with some embarrassment.

"It's good. Wang Gong said with a smile: "There is no problem with the whole power, it has hit one hundred and one in the morning, and we are slowly approaching its limit to see where its limit is." ”

Zhou Gong here shook his head when he heard this, and said, "Old Wang, I'm afraid this has to be slow." After the morning bombardment, the car trembled very sharply. If it is raised, I am worried that it will cause great damage to the body. We still have a lot of projects that haven't been tested yet, so I thought, can we test all the other projects successfully, and then let's go back and test this again. When the time comes, even if the whole car falls apart, it doesn't matter. ”

Wang Gong and several experts nodded their heads in agreement when they heard this. And Jiang Chen also expressed his support, first the easy and then the difficult, one by one, to do the biggest thing at the lowest cost, this is the best.

(To be continued.) )