Abstract: Provided are a composite coating, a piston, an engine, and a vehicle. The composite coating comprises a metal bonding layer, a transition layer, a ceramic layer, and a sealing layer which are sequentially laminated, wherein the metal bonding layer is configured to be bonded with a piston basic body, the metal bonding layer is a rare earth metal modified bonding layer, and the transition layer is a rare earth metal modified zirconia layer.

Abstract: An engine piston is provided. A first sealing structure, including a first sealing rubber ring and a first annular groove, is provided at a head of the engine piston. The first sealing rubber ring has a U-shaped section with a reserved space at the top of the first sealing rubber ring, and a gap for circulating hydraulic oil is provided between a ring bank, above the first sealing rubber ring, of the engine piston and a simulated cylinder liner of a fatigue testing apparatus for an engine piston. In a case that the hydraulic oil is introduced into the fatigue testing apparatus for the engine piston to simulate pressure loading under a high-explosion pressure, when the hydraulic oil enters into the reserved space from the gap for circulating the hydraulic oil, an inner wall of the reserved space is squeezed and the first sealing rubber ring is deformed.

Abstract: An engine piston is provided. A first sealing structure, including a first sealing rubber ring and a first annular groove, is provided at a head of the engine piston. The first sealing rubber ring has a U-shaped section with a reserved space at the top of the first sealing rubber ring, and a gap for circulating hydraulic oil is provided between a ring bank, above the first sealing rubber ring, of the engine piston and a simulated cylinder liner of a fatigue testing apparatus for an engine piston. In a case that the hydraulic oil is introduced into the fatigue testing apparatus for the engine piston to simulate pressure loading under a high-explosion pressure, when the hydraulic oil enters into the reserved space from the gap for circulating the hydraulic oil, an inner wall of the reserved space is squeezed and the first sealing rubber ring is deformed.

Abstract: A control method and a control apparatus are provided. A main control circuit board in a controller receives an initial control command via a CAN bus from an ECU after being powered on, controls a fault detection circuit board to detect initial states of the controller and all devices connected to the controller based on the initial control command to obtain initial state information, transmits the initial state information to the ECU via the CAN bus, receives a first target control command via the CAN bus from the ECU, and controls a conduction control circuit board to turn on at least one MOS in a MOS array based on the first target control command to output a control signal to a heater connected to the controller to control the heater to operate, thereby realizing a closed-loop control on the heater and adjusting a power of the heater at any time.