Auxiliary exhaust braking system of supercharged engine
A supercharged engine and exhaust braking technology, which is applied in the direction of engine control, engine components, combustion engines, etc., can solve the problems of weak gas flow increase effect, small intake air volume, and low braking power, so as to improve energy Utilization rate, improved braking power, and the effect of reducing energy waste
Inactive Publication Date: 2021-04-20
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology
[0004] However, the above-mentioned exhaust auxiliary braking method has the following disadvantages: 1. The compressed air of the air compressor enters the engine through the air bypass air passage, the air density is low, the intake air volume is small, and the effect on the increase of the gas flow in the cylinder is relatively weak. The power is low, and the improvement effect of auxiliary braking is poor; 2. The air compressed by the air compressor enters the engine through the air bypass air passage, which will affect the air supply from the air compressor to the air storage tank, and affect the air consumption and reliability of the vehicle braking system
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[0022] The embodiment of the present invention provides a supercharged engine auxiliary exhaust brake system. The excess gas discharged from the existing air compressor 11 of the vehicle is stored through the accumulator 19, and the gas stored in the accumulator 19 is passed through the supercharger. 4 enters the engine 8 after secondary supercharging, which not only saves energy, but also significantly improves the auxiliary braking power of the internal combustion engine.
[0023] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments...
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The invention discloses an auxiliary exhaust braking system of a supercharged engine, and relates to the field of waste gas energy recovery of supercharged internal combustion engines. The auxiliary exhaust braking system comprises a braking assembly and a control assembly, the braking assembly comprises a pressure accumulator and an exhaust braking valve,and an air outlet of the pressure accumulator is connected with an air inlet of a vehicle supercharger; the exhaust braking valve is positioned in an exhaust passage of a vehicle; the control assembly comprises a whole vehicle VCU, a change-over valve arranged between a vehicle air compressor and a vehicle air storage tank and a bypass valve arranged between the pressure accumulator and the vehicle supercharger, an air inlet of the pressure accumulator is connected with the change-over valve, and the whole vehicle VCU is electrically connected with the change-over valve so as to control the change-over valve to enable airflow generated by the air compressor to enter the air storage tank or the pressure accumulator; and the exhaust braking valve, the air storage tank and the bypass valve are all electrically connected with the whole vehicle VCU, and the change-over valve adopts a two-position three-way valve. According to the auxiliary exhaust braking system, the stage braking power can be improved to the greatest extent.
Description
technical field [0001] The invention relates to the field of waste gas energy recovery of a supercharged internal combustion engine, in particular to a supercharged engine auxiliary exhaust braking system. Background technique [0002] Existing commercial vehicles generally use exhaust brakes as auxiliary brakes to improve the braking capacity of the vehicles. With the increase of air resistance, the exhaust stroke of the internal combustion engine piston must overcome this pressure. The piston is subjected to the back pressure of the gas, which is transmitted to the wheels through the crankshaft and the transmission system, forcing the vehicle to reduce the speed, so as to achieve the purpose of reducing the vehicle speed in a short time. Improve braking capacity to reduce the use of service brakes, reduce wear and overheating of service brakes, and ensure driving safety. [0003] At the same time, an air bypass air passage is set between the outlet of the air compressor a...
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IPC IPC(8): F02D9/06F02B33/44F02B39/00
Inventor 李平路恒殷勇张辉亚胡崴邓磊
Owner DONGFENG COMML VEHICLE CO LTD