Vehicle engine output control method and vehicle engine

• US 5,151,861 A
• Filed: 02/21/1992
• Issued: 09/29/1992
• Est. Priority Date: 02/22/1989
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Original Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Inventors: Yoshida, Masato, Ueda, Katsunori, Shimada, Makoto, Togai, Kazuhide, Danno, Yoshiaki
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): PARK, COLLIN
• Application Number:
  US07/840,646
• Time in Patent Office: 221 Days
• Field of Search: 364/426.01, 364/426.02, 364/426.03, 364/431.04, 364/431.07, 364/426.04, 180/197, 123/336, 123/361, 123/399, 123/442, 74/844, 74/866, 192/0.062, 192/0.08
• US Class Current: 701/90
• CPC Class Codes: B60K 28/16 responsive to, or preventing, skidding of wheels brake control systems for vehicle drive stability B60T8/1755; arrangements responsive to a speed condition for adjusting wheel braking force B60T8/32; control of vehicle driving stability otherwise than by controlling the propulsion unit only B60W30/02; preventing wheel slippage by reducing power in rail vehicles B61C15/00
• CPC Class Codes: F02D 11/10 of the electric type
• CPC Class Codes: F02D 2011/102 at least one throttle being moved only by an electric actuator

Abstract

A method and apparatus for calculating a target torque of an engine in accordance with operation condition of a vehicle, calculating a target intake air amount per engine revolution cycle required to generate the target engine torque, calculating an opening of a sub throttle valve disposed in an intake path of the engine from an opening of a main throttle valve disposed in the intake path, of which an opening is controlled in accordance with an operation amount of an accelerator pedal, and the target intake air amount, or calculating an equivalent throttle opening assuming the main throttle valve and the sub throttle valve as an equivalent throttle valve in accordance with the target intake air amount, calculating the sub throttle valve opening by correcting the equivalent throttle opening with a correction coefficient determined by the relationship between the equivalent throttle opening and the main throttle valve opening, and on/off controlling the sub throttle valve in accordance with the calculated sub throttle valve opening.

Claims

1. A vehicle engine output control method comprising:

calculating a target torque of an engine in accordance with an operational condition of a vehicle;

calculating a target intake air amount per engine revolution cycle necessary to output said target engine torque;

calculating an opening of a sub throttle valve disposed in an intake path of the engine from an opening of a main throttle valve disposed in the intake path of which said opening of said main throttle valve is controlled in accordance with an operation amount of an accelerator pedal and said target intake air amount;

on/off controlling said sub throttle valve in accordance with said calculated sub throttle valve opening; and

correcting said target engine torque in accordance with a response delay of a torque converter signal, a transmission friction signal, an external load signal of the engine, an atmospheric condition signal, and said operational condition of the vehicle, and, calculating said target intake air amount in accordance with said corrected target engine torque.

2. The vehicle engine output control method of claim 1 wherein a slip value of driving wheels of the vehicle is detected as said operation condition of the vehicle.

3. A vehicle engine output control method comprising:

calculating a target torque of an engine in accordance with an operational condition of a vehicle;

calculating a target intake air amount per engine revolution cycle necessary to output said target engine torque;

calculating an equivalent throttle opening based on said target intake air amount assuming a main throttle valve disposed in an intake path of the engine of which said opening of said main throttle valve is controlled in accordance with an operation amount of an accelerator pedal and an independently on/off controllable sub throttle valve as an equivalent throttle valve;

correcting said equivalent throttle opening with a correction coefficient determined by a relationship between said equivalent throttle opening and said main throttle valve opening to calculate an opening of said sub throttle valve;

on/off controlling said sub throttle valve in accordance with said calculated sub throttle valve opening; and

correcting said target engine torque in accordance with a response delay of a torque converter signal, a transmission friction signal, an external load signal of the engine, an atmospheric condition signal, and said operation condition of the vehicle, and, calculating said target intake air amount in accordance with said corrected target engine torque.

4. The vehicle engine output control method of claim 3 wherein a slip value of driving wheels of the vehicle is detected as said operation condition of the vehicle.

5. A vehicle engine output control apparatus comprising:

a main throttle valve disposed in an intake path of an engine for a vehicle, of which an opening is controlled in accordance with an operation amount of an accelerator pedal;

a sub throttle valve disposed in the intake path,

operation condition detecting means for detecting operation condition of the vehicle;

target engine torque calculating means for calculating an engine torque to be outputted from the engine in accordance with the detection result of said operation condition detecting means;

target intake air amount calculating means for calculating a target intake air amount per engine revolution cycle required to generate said target engine torque;

sub throttle valve opening calculating means for calculating an opening of the sub throttle valve from said target intake air amount and an opening of said main throttle valve; and

,

sub throttle valve on/off control means for on/of controlling said sub throttle valve in accordance with said calculated sub throttle valve opening; and

wherein said target engine torque calculating means comprises a correction section for correcting said target engine torque in accordance with a response delay of a torque converter, a transmission friction, an external load of the engine, an atmospheric condition, and an operation condition.

6. The vehicle engine output control apparatus of claim 5 wherein said operation condition detecting means comprises driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle and driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle and calculates a slip value in accordance with a difference between said driving wheel velocity of the vehicle detected by said driving wheel velocity detecting means and said driven wheel velocity of the vehicle detected by said driven wheel velocity detecting means.

7. A vehicle engine output control apparatus comprising:

a main throttle valve disposed in an intake path of an engine for a vehicle, of which an opening is controlled in accordance with an operation amount of an accelerator pedal;

a sub throttle valve disposed in the intake path,

operation condition detecting means for detecting operation condition of the vehicle;

target engine torque calculating means for calculating an engine torque to be outputted from the engine in accordance with the detection result of said operation condition detecting means;

target intake air amount calculating means for calculating a target intake air amount per engine revolution cycle required to generate said target engine torque;

equivalent throttle valve opening calculating means for calculating an equivalent throttle opening from said target intake air amount per engine revolution cycle assuming said main and sub throttle valves as an equivalent throttle valve;

correction coefficient storing means for storing a correction coefficient determined by the relationship between said equivalent throttle opening and said main throttle valve opening;

sub throttle valve opening calculating means for calculating a sub throttle valve opening by correcting said equivalent throttle opening with said correction coefficient; and

sub throttle valve on/off control means for on/off controlling said sub throttle valve in accordance with said calculated sub throttle valve opening;

wherein said target engine torque calculating means comprises a correction section for correcting said target engine torque in accordance with a response delay of a torque converter, a transmission friction, an external load of the engine, an atmospheric condition and an operation condition.

8. The vehicle engine output control apparatus of claim 7 wherein said operation condition detecting means comprises driving wheel velocity detecting means for detecting a driving wheel velocity of the vehicle and driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle and calculates a slip value in accordance with a difference between said driving wheel velocity of the vehicle detected by said driving wheel velocity detecting means and said driven wheel velocity of the vehicle detected by said driven wheel velocity detecting means.