Engine roughness control

• US 4,776,312 A
• Filed: 07/10/1987
• Issued: 10/11/1988
• Est. Priority Date: 09/07/1984
• Status: Expired due to Term

• Current Assignee: Mazda Motor Corporation
• Original Assignee: Mazda Motor Corporation
• Inventors: Matsuura, Masahiko, Ueda, Kazuhiko, Doi, Nobuo, Yoshioka, Sadashichi, Okimoto, Haruo
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US07/073,879
• Time in Patent Office: 459 Days
• Field of Search: 123/491, 123/492, 123/493, 123/421, 123/422, 123/423, 123/436, 123/419, 123/424
• US Class Current: 123/436
• CPC Class Codes: F02D 2200/1015 Engines misfires
• CPC Class Codes: F02D 41/1406 with use of a optimisation method, e.g. iteration
• CPC Class Codes: F02D 41/1498 measuring engine roughness

Abstract

An engine control system having an engine vibration sensor which detects engine vibrations. A control circuit is provided for discriminating engine roughness wherein the engine vibration level is above a predetermined level and for decreasing the fuel supply continuously when engine roughness is not detected, in order to make the mixture leaner, but increasing the fuel supply when engine roughness is detected to make the mixture richer. A detector is provided for detecting a specific engine condition wherein the mixture is enriched for specific purposes. The control circuit is responsive to the output of the engine condition detector and discontinues the roughness control when the specific engine condition is detected.

Claims

1. An engine control system for a vehicle having a transmission, said control system including engine operating condition detecting means for detecting an engine operating condition, engine combustion control means for controlling at least one factor which affects conditions of combustion in the engine, actuating means connected with said engine operating condition detecting means to receive an engine operating condition signal therefrom and to produce an output for actuating the engine combustion control means, roughness detecting means for detecting engine vibrations caused by changes in combustion in the engine, modifying means responsive to an output of the roughness detecting means to modify the output of the actuating means, specific condition detecting means for detecting a specific condition wherein the condition of combustion changes momentarily, and roughness control discontinuing means responsive to an output from the specific condition detecting means to discontinue operation of the modifying means, wherein said specific condition is a condition wherein the transmission is being shifted.

2. An engine control system in which the engine is for a vehicle having an auxiliary facility, said control system including engine operating condition detecting means for detecting an engine operating condition, engine combustion control means for controlling at least one factor which affects conditions of combustion in the engine, actuating means connected with said engine operating condition detecting means to receive an engine operating condition signal therefrom and to produce an output for actuating the engine combustion control means, roughness detecting means for detecting engine vibrations caused by changes in combustion in the engine, modifying means responsive to an output of the roughness detecting means to modify the output of the actuating means, specific condition detecting means for detecting a specific condition wherein the condition of combustion changes momentarily, roughness control discontinuing means responsive to an output from the specific condition detecting means to discontinue operation of the modifying means, wherein said specific condition is an instance wherein the load of the auxiliary facility is just applied to the engine