Apparatus for injecting LP gas into diesel engine

• US 4,909,209 A
• Filed: 06/14/1989
• Issued: 03/20/1990
• Est. Priority Date: 06/17/1988
• Status: Expired due to Term

• Current Assignee: Nihon Kankyo Denso Company Limited
• Original Assignee: Nihon Kankyo Denso Company Limited
• Inventors: Takahasi, Yositeru
• Primary Examiner(s): Cross, E. Rollins
• Application Number:
  US07/366,132
• Time in Patent Office: 279 Days
• Field of Search: 123/27 GE, 123/527
• US Class Current: 123/27.0GE
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02D 19/0615 being initiated by automatic means, e.g. based on engine or vehicle operating conditions
• CPC Class Codes: F02D 19/0631 by estimation, i.e. without using direct measurements of a corresponding sensor
• CPC Class Codes: F02D 19/0647 the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
• CPC Class Codes: F02D 19/105 operating in a special mode, e.g. in a liquid fuel only mode for starting
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

An important for a diesel engine by injecting LP gas into the diesel engine. A solenoid valve and a pressure controller are provided in a line between an LP gas cylinder and a gas injector mounted on the air inlet of the diesel engine. The solenoid valve is activated only when the engine temperature has risen above a predetermined level and only after the vehicle speed has exceeded a predermined level. This arrangement increases the output of the diesel engine, saves the fuel cost and eliminates black smoke.

Claims

1. An apparatus for injecting LP gas into a diesel engine, comprising an injector nozzle mounted on the air inlet of the diesel engine and having an adjustable inner diameter, a cylinder containing LP gas, a solenoid valve and a pressure controller provided in a line between said cylinder and said LP gas injector, a thermostat for activating said solenoid valve only when the engine has heated up to a predetermined level, and a stop switch for activating said solenoid valve only when the vehicle speed has risen above a predetermined level.