Sequential fuel gas injection system with on-board diagnostics (OBD) system for automobile

Abstract

The invention relates to a sequential fuel gas injection system with an on-board diagnostics (OBD) system for an automobile. The sequential fuel gas injection system comprises a fuel gas supply system, wherein in the fuel gas supply system, a gas storage steel cylinder is connected with a high-pressure electromagnetic valve; a pressure sensor is arranged on the high-pressure electromagnetic valve; the high-pressure electromagnetic valve is connected to a manual cutoff valve through a steel pipe, and is connected to a pressure reducer through a steel pipe; the pressure reducer is connected with one end of a gas filter through a rubber hose; the other end of the gas filter is connected with a gas injection valve through a rubber hose; a nozzle of the gas injection valve is connected with a corresponding engine cylinder through a rubber hose; the gas storage steel cylinder is provided with a steel bottle angle valve; a gas outlet pipe of the gas storage steel cylinder is provided with a gas charging valve; and an electric control system consists of a water temperature sensor which is arranged on the pressure reducer, a gas temperature sensor which is arranged on the gas injection valve, a change-over switch, a buzzer, a manifold pressure sensor, a fuel gas pressure sensor, an oxygen sensor, an engine rotating speed sensor, an OBD adapter and a fuel gas electronic control unit (ECU). In the fuel gas multi-point sequential injection control system with OBD function, optimal air-fuel ratio of the engine and optimal traveling performance of the automobile are ensured under various working conditions, and economical efficiency is improved by over 10 percent compared with the conventional fuel gas system for the automobile.

Description

1. Technical field [0001] The invention relates to a gas injection system for a vehicle, in particular to a sequential gas injection system for a vehicle with an OBD system for precise injection control of gas. 2. Background technology [0002] With the development of the global transportation industry, countries pay more and more attention to vehicle exhaust emissions. On June 24, 2008, the Ministry of Environmental Protection issued the "Technical Requirements for Compression Ignition Engines, Gas Fuel Ignition Engines and Vehicle On-Board Diagnostics (OBD) Systems for Vehicles", and announced that this requirement will be implemented from July 1, 2008. At present, the existing gas engine electronically controlled multi-point sequential injection system and control method can no longer meet this requirement. The existing gas system only has a rough control of the gas pulse width, and cannot accept the monitoring of the original vehicle OBD and short-term monitoring of the ...

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Problems solved by technology

At present, the existing gas engine electronically controlled multi-point sequential injection system and control method can no longer meet this requirement. The existing gas system only has a rough control of the gas pulse width, and cannot accept the monitoring of the original vehicle OBD and short-term monitoring of the gas pulse width. Correction and long-term correction, so that it cannot meet the current national 3 or 4 emission requirements, causing the OBD fault light to light up when the gas is used

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