Control apparatus of internal combustion engine

• US 20050155587A1
• Filed: 01/12/2005
• Published: 07/21/2005
• Est. Priority Date: 01/15/2004
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Suzuki, Naoto
• Granted Patent: US 7,185,641 B2
• Time in Patent Office: Days
• US Class Current: 123/520
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/0032 Controlling the purging of the canister as a function of the engine operating conditions
• CPC Class Codes: F02D 41/0042 Controlling the combustible mixture as a function of the canister purging, e.g. control of injected fuel to compensate for deviation of air fuel ratio when purging
• CPC Class Codes: F02D 41/0065 Specific aspects of external EGR control constructional details of EGR system F02M26/00
• CPC Class Codes: F02M 25/08 adding fuel vapours drawn from engine fuel reservoir electrical control of purge system F02D41/003
• CPC Class Codes: F02M 26/00 Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

Both evaporated fuel purge and EGR are performed by supplying both an evaporated fuel and an exhaust gas at a position downstream from a throttle valve, of an intake pipe. A controller for controlling a purge flow rate and an EGR flow rate controls an opening degree of a purge control valve and an opening degree of the throttle valve, for example, as an operational state of an engine to compensate for a decrease in the purge flow rate caused by an increase in the EGR flow rate.

Claims

1. A control apparatus of an internal combustion engine for controlling an amount of an evaporated fuel and an amount of an exhaust gas supplied downstream from a throttle valve of an intake pipe, comprising:

a compensation control device for controlling an operational state of the internal combustion engine to compensate for adecrease in the supply amount of the evaporated fuel caused by an increase in the supply amount of the exhaust gas.

2. The control apparatus of the internal combustion engine according to claim 1, wherein said compensation control device controls an opening degree of the throttle valve to compensate for the decrease in the supply amount of the evaporated fuel caused by the increase in the supply amount of the exhaust gas.

3. The control apparatus of the internal combustion engine according to claim 2, wherein said compensation control device calculates a compensation amount of the opening degree of the throttle valve in accordance with the supply amount of the exhaust gas and controls the opening degree of the throttle valve based on the compensation amount.

4. The control apparatus of the internal combustion engine according to claim 2, wherein said compensation control device restricts the opening degree of the throttle valve so that the opening degree of the throttle valve does not exceed an upper limit value.

5. The control apparatus of the internal combustion engine according to claim 4, wherein said compensation control device changes the upper limit value in accordance with the supply amount of the exhaust gas.

6. The control apparatus of the internal combustion engine according to claim 5, wherein said compensation control device changes the upper limit value in accordance with the supply amount of the exhaust gas so that negative pressure in the downstream side from the throttle valve, of the intake pipe becomes substantially constant when the opening degree of the throttle valve is at the upper limit value.

7. The control apparatus of the internal combustion engine according to claim 1, wherein the supply amount of the evaporated fuel is controlled by controlling an opening degree of a purge control valve, and wherein said compensation control device controls the opening degree of the purge control valve to compensate for the decrease in the supply amount of the evaporated fuel caused by the increase in the supply amount of the exhaust gas.

8. The control apparatus of the internal combustion engine according to claim 7, wherein said compensation control device calculates a compensation amount of the opening degree of the purge control valve in accordance with the supply amount of the exhaust gas, and controls the opening degree of the purge control valve based on the compensation amount.

9. The control apparatus of the internal combustion engine according to claim 7, wherein said compensation control device, upon determining that a desired supply amount of evaporated fuel cannot be obtained by the control of the opening degree of the purge control valve, controls the opening degree of the throttle valve to compensate for the decrease in the supply amount of the evaporated fuel.