Honda Giken Kogyo Kabushiki Kaisha

Tomomi Yuhara

Tsuguo Watanabe

Kenichi Machida

Masahiko Abe

Yoshiyuki Kurayoshi

Takashi Akagi

Yoshiaki Hirakata

Tatsuo Hayashi

Naohisa Hirao

Shiro Kokubu

To improve the maintenance and inspection of a fuel injection valve, as well working of the fuel piping and wiring to the fuel injection valve. An engine fuel injection apparatus includes an air chamber provided on an upstream end of an air intake passage of an engine. A first fuel injection valve for injecting fuel toward the upstream end of the air intake passage is provided on a wall of the air chamber facing a wall connected to the upstream end of the air intake passage. The fuel piping and wiring to the first fuel injection valve is located outside of the air chamber. The air chamber also serves as an air cleaner case provided with a filter element therein.

Engine fuel injection apparatus

A fuel injection system and method for injecting fuel for an internal combustion engine having fuel injection valves arranged on the upstream side and downstream side from the throttle valve respectively which consistently supplies an adequate quantity of fuel into the combustion chamber without fuel adhering to or remaining at the throttle valve, even when the throttle valve is abruptly enclosed. Based on plural parameters including the throttle opening &#x3b8;TH and the engine speed NE, the system includes means for determining the injection quantity of each of the upstream and downstream fuel injection valves, means for detecting a rate of change &#x394;&#x3b8;TH of the throttle opening in the injection-valve closing direction, means for stopping fuel injection of the upstream fuel injection valve when the rate of change &#x394;&#x3b8;TH is large, and means for reducing the injection quantity from the downstream fuel injection valve when the fuel injection of the upstream injection valve is stopped.

Fuel injection system and fuel injecting method for internal combustion engine

A fuel injection control system for an internal combustion engine can obtain an optimum fuel injection quantity in response to a traveling load without the need for a large memory. The gear position discrimination unit determines the present gear position Ngp on the basis of the vehicle speed Vpls and the engine speed NE. The Kgpd calculation unit calculates the correction factor by gear Kgpd on the basis of the gear position Ngp and the engine speed NE. The state judgment unit judges whether the engine is in a steady state or in a transient state. The map selection unit selects, on the basis of the judgment result of the engine state, the PB map or the TH map for determining the basic injection quantity Ti. The basic injection quantity determination unit determines the basic injection quantity Ti on the basis of a product of the PB map or TH map and the correction factor by gear Kgpd.

Fuel injection control system for internal combustion engine

A fuel injection system for an internal combustion engine has an upstream fuel injector provided upstream from the throttle valve and a downstream fuel injector provided downstream therefrom. A device is provided for determining a fuel injection quantity of the upstream and downstream fuel injectors. A sensor detects the intake temperature TA on the upstream side from an injection area of the upstream fuel injector. A device is provided for seeking an intake temperature correction factor KTA on the basis of the intake temperature TA and a fuel injection quantity of the upstream fuel injector. At least one of the fuel injection quantities due to the upstream and downstream fuel injectors is corrected on the basis of the intake temperature correction factor KTA.

Fuel injection system for internal combustion engine

In an internal combustion engine in which fuel injection valves are arranged upstream from and downstream from the throttle valve, respectively, the response of the accelerated increase in quantity and correction will be improved. The total injection quantity determination unit determines a total quantity of fuel to be injected from each fuel injection valve. The injection rate determination unit determines an injection rate of the upstream injection valve. The injection quantity correction unit includes an accelerated increase in quantity and correction unit, and during acceleration, increases and corrects only the injection quantity of the downstream injection valve during acceleration. The injection quantity determination unit determines the injection quantity of the upstream injection valve on the basis of the injection rate and the total injection quantity, and determines the injection quantity of the downstream injection valve on the basis of the upstream injection quantity and the total injection quantity.

To enable a reduction of the number of fuel pipes and joint parts to facilitate piping work, maintenance and inspection. An engine fuel injection apparatus includes first fuel injection valves provided on an upstream side of an air intake passage of an engine, second fuel injection valves provided on a downstream side of the air intake passage, and a fuel pump for supplying fuel to the first and the second fuel injection valves. The second fuel injection valves are positioned at a level lower than the first fuel injection valves, and the fuel pump is connected to the second fuel injection valves via the first fuel injection valves by fuel feed pipes, so that fuel does not return to a fuel tank of the engine.

To allow an engine having an intake duct for drawing running air to produce a high output by performing appropriate fuel injection depending on dynamic pressure variations. A vehicle speed corrective coefficient calculator calculates a fuel corrective coefficient KVPLS based on a vehicle speed VPLS, and a throttle corrective coefficient calculator calculates a corrective coefficient KV&thgr;TH based on a throttle opening &thgr;TH. A corrective coefficient multiplier multiplies the fuel corrective coefficient KVPLS and the corrective coefficient KV&thgr;TH, thus calculating a vehicle speed fuel adjustment corrective coefficient KVAF. An injection time calculator calculates a basic injection time TiM based on the throttle opening &thgr;TH and an engine rotational speed Ne, and also calculates a fuel injection time Ti by reading the vehicle speed fuel adjustment corrective coefficient KVAF and correcting the basic injection time TiM. When the engine rotational speed Ne is equal to or higher than a predetermined value Ne1 and also when the transmission is shifted to a low gear position, a corrective coefficient KVAF signal is applied to the injection time calculator.

Fuel injection control apparatus

To change a fuel injection quantity to follow a throttle opening change in a low load region. A first calculator calculates a basic injection time using a throttle opening and an engine rotational speed. A second calculator calculates a basic injection time using an intake pipe negative pressure and the engine rotational speed. A selector selects the first calculator when the load is higher, and selects the second calculator when the load is lower. If the rate of change of the throttle opening is greater than a reference value, then a switcher sets the selector to select the first calculator. Thus, if the rate of increase of the throttle opening is greater than the reference value even when the load is low, the first calculator is selected.

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Saitama, Japan

Tomomi Yuhara