Abstract: Some embodiments of a present disclosure provide a variable valve lift device. The variable valve lift device includes a main shaft, a sleeve, an oil cylinder and a valve mechanism. The sleeve is provided on the main shaft in a sleeve manner, can be driven by the main shaft to rotate together with the main shaft, and can further linearly move relative to the main shaft along an axis direction of the main shaft. A cam assembly is disposed on the sleeve, and includes at least two cams with different projection heights. The oil cylinder includes a cylinder barrel and a piston disposed in the cylinder barrel, the cylinder barrel is fixed onto the main shaft, the piston is fixedly connected to the sleeve. Some embodiments of the present disclosure provide an automobile having the above variable valve lift device.

Abstract: Some embodiments of a present disclosure provide a variable valve lift device. The variable valve lift device includes a main shaft, a sleeve, an oil cylinder and a valve mechanism. The sleeve is provided on the main shaft in a sleeve manner, can be driven by the main shaft to rotate together with the main shaft, and can further linearly move relative to the main shaft along an axis direction of the main shaft. A cam assembly is disposed on the sleeve, and includes at least two cams with different projection heights. The oil cylinder includes a cylinder barrel and a piston disposed in the cylinder barrel, the cylinder barrel is fixed onto the main shaft, the piston is fixedly connected to the sleeve. Some embodiments of the present disclosure provide an automobile having the above variable valve lift device.

Abstract: An exhaust gas recirculation system for gasoline engine includes a first exhaust gas return tube, a high-pressure by-pass tube, a second exhaust gas return tube and an EGR control unit. The first exhaust gas return tube includes a hot end, a cold end, a high-pressure EGR cooler, and a high-pressure EGR valve. The high-pressure by-pass tube connected with the first exhaust gas return tube in parallel has a high-pressure EGR by-pass valve. The second exhaust gas return tube has a hot end, a cold end, a low-pressure EGR cooler, a low-pressure EGR valve and a low-pressure EGR pump. The EGR control unit is electrically connected with the high-pressure EGR valve, the high-pressure EGR by-pass valve, the low-pressure EGR valve and the low-pressure EGR pump respectively. Different EGR recirculation manners can be chosen under different loads and different running conditions of the gasoline engine to meet different demands under different conditions.