A control system for an engine of an automotive vehicle equipped with a lock-up type automatic transmission. The engine control system comprises a gear ratio determinating circuit and a vehicle speed detector for determining whether the automotive vehicle is operating in a predetermined lock-up range or not and a logic circuit for generating a lock-up signal that indicates that the automotive vehicle is operating within said predetermined lock-up range, whereupon exhaust gas recirculation and ignition timing are varied from their ordinary patterns to a pattern suitable for operation of the engine with the torque converter operating in a lock-up state.

Control system for engine of automotive vehicle equipped with lock-up type automatic transmission

A method and apparatus for controlling ignition system spark timing where exhaust gas recirculation is employed. The value of spark advance is determined based upon engine operating parameters and exhaust gas recirculation rate is sensed. Correction means is provided which corrects the value of spark advance in accordance with the sensed value or actual valve of exhaust gas recirculation rate.

Method and apparatus for ignition system spark timing control where exhaust gas recirculation is used

Methods and systems are provided for addressing spark plug soot fouling. In one example, spark plug tip temperatures are raised and maintained elevated by advancing spark timing and increasing engine speed, while reducing an amount of EGR being delivered to the engine. The spark plug fouling mitigating actions are adjusted based on whether the engine is in a green condition at an assembly plant or not.

Method and system for ignition control

An exhaust gas purification control apparatus for an internal combustion engine wherein vacuum signals applied to air fuel mixture control, exhaust gas recirculation control, and ignition timing control are modified by a vacuum signal modifier. The vacuum signal modifier is operative in response to a pressure signal applied thereto. This pressure signal is produced by a pressure signal control device by diluting a venturi vacuum with air.

Exhaust gas purification control apparatus for internal combustion engine

An E.G.R. control system includes a pressure modulator operative to modulate the magnitude of the port vacuum as applied to a diaphragm type actuator of an E.G.R. valve. The modulator comprises a housing and a diaphragm assembly disposed in the housing and consisting of a pair of diaphragms and a member connecting the diaphragms so that they are deformed simultaneously. The diaphragm assembly divides the interior of the housing into first, second and third chambers which are communicated with the engine carburetor venturi, vented to the atmosphere and communicated with the E.G.R. passage between the E.G.R. valve and a fixed restriction in the E.G.R. passage upstream of the E.G.R. valve, respectively, so that the diaphragm assembly is moved in response to variation in the venturi vacuum and also in response to variation in the exhaust gas pressure in the E.G.R. passage between the restriction and the E.G.R. valve. A valve member is mounted on the diaphragm assembly for movement therewith to control the flow of the atmospheric air from the second chamber into the E.G.R. valve actuator so that the port vacuum as applied to the E.G.R. valve actuator is modulated. The controlled flow of the recirculated exhaust gases through the E.G.R. passage from the exhaust pipe into the intake pipe is in proportion to the intake air flow.

Exhaust gas recirculation control system

An engine is equipped with an EGR system in which the amount of recirculated exhaust gases is controlled in response to an intake vacuum in an intake passage The spark timing of the engine is controlled to advance in accordance with the increase of the amount of the recirculated exhaust gases so as to maintain stable engine running even under a considerably high EGR rate

Aoyama Syunichi

Papers

Spark advance control device for engine equipped with EGR system