ENGINE START CONTROL DEVICE

• US 20130104829A1
• Filed: 10/24/2012
• Published: 05/02/2013
• Est. Priority Date: 10/26/2011
• Status: Active Grant

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: MIYAKI, Tomohiko
• Granted Patent: US 9,410,492 B2
• Time in Patent Office: Days
• US Class Current: 123/179.3
• CPC Class Codes: F02D 2200/021 Engine temperature
• CPC Class Codes: F02D 2200/023 Temperature of lubricating oil or working fluid
• CPC Class Codes: F02D 31/005 by controlling a throttle by-pass
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/062 for starting F02D41/061 takes precedence
• CPC Class Codes: F02D 9/1055 having a fluid by-pass
• CPC Class Codes: F02M 69/32 with an air by-pass around the air throttle valve or with an auxiliary air passage, e.g. with a variably controlled valve therein
• CPC Class Codes: F02N 11/087 Details of the switching means in starting circuits, e.g. relays or electronic switches
• CPC Class Codes: F02N 2200/023 Engine temperature
• CPC Class Codes: F02N 2250/02 Battery voltage drop at start, e.g. drops causing ECU reset
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An engine start control device includes: a control valve which adjusts a gas flow rate of a gas channel provided so as to bypass a throttle valve of an engine; a starter motor capable of driving a crankshaft of the engine; a control unit which controls an opening degree of the control valve and a current supply to the starter motor; and a latch circuit which holds a command for current control from the control unit to the starter motor, wherein the control unit performs the control so as to cause the current supply to the starter motor to start after the opening degree of the control valve reaches a target opening degree for an engine start time, and even when the control unit is reset, the latch circuit continues the current supply to the starter motor according to the command for current control that the latch circuit keeps holding.

Claims

1. An engine start control device comprising:

a control valve which adjusts a gas flow rate of a gas channel provided so as to bypass a throttle valve of an engine;

a starter motor capable of driving a crankshaft of the engine;

a control unit which controls an opening degree of the control valve and a current supply to the starter motor; and

a latch circuit which holds a command for current control from the control unit to the starter motor, wherein;

the control unit performs the control so as to cause the current supply to the starter motor to start after the opening degree of the control valve reaches a target opening degree for an engine start time; and

even when the control unit is reset, the latch circuit continues the current supply to the starter motor according to the command for current control that the latch circuit keeps holding.

2. The engine start control device according to claim 1, wherein the control unit determines whether or not current activation is reactivation due to the resetting, based on the command for current control that the latch circuit holds.

3. The engine start control device according to claim 2, wherein the control unit fixes the opening degree of the control valve when the current activation is the reactivation due to the resetting.

4. The engine start control device according to claim 2, wherein the control unit does not initialize the opening degree of the control valve when the current activation is the reactivation due to the resetting.

5. The engine start control device according to claim 2, further comprising

a sensor which detects a state of the engine, wherein,

when the current activation is the reactivation due to the resetting, the control unit recognizes the opening degree of the control valve from a state of the sensor.

6. The engine start control device according to claim 5, wherein the sensor which detects the state of the engine is an engine temperature sensor.

7. The engine start control device according to claim 1, wherein the control unit initializes the opening degree of the control valve at a timing when the power supply to the control unit is stopped after the engine is started or at a timing when the power supply to the control unit is stopped after the control unit is reset without the engine being started.