Kick down shift control apparatus of automatic transmission and method therefor

• US 20020068662A1
• Filed: 10/09/2001
• Published: 06/06/2002
• Est. Priority Date: 12/06/2000
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Jeon, Byeong Wook
• Granted Patent: US 6,612,967 B2
• Time in Patent Office: Days
• US Class Current: 477/141
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: F16H 59/20 Kickdown
• CPC Class Codes: F16H 59/50 Inputs being a function of the status of the machine, e.g. position of doors or safety belts
• CPC Class Codes: F16H 59/74 Inputs being a function of engine parameters F16H59/14 takes precedence
• CPC Class Codes: F16H 61/0437 by using electrical signals F16H61/0403 and F16H61/061 take precedence

Abstract

A kick down shift control apparatus of an automatic transmission of a vehicle comprising: vehicle running state sensing means for checking a running state of the vehicle; engine control means for controlling engine outputs in response to a signal sensed by the vehicle running state sensing means and outputting information on the temperature of intake air and the operational state of an air conditioner; shift control means for outputting a control signal to correct the pressure of transmission oil according to the temperature of absorbed air and the operational state of the air conditioner input from the engine control means, if conditions for a kick down shift are met with reception of the signal checked by the vehicle running state sensing means; and driving means for controlling the oil pressure discharged out by the oil pump according to the control signal output from the shift control means and performing a shift by providing the oil pressure for a relevant friction factor, thus relieving an shifting shock that generates at the time of a kick down shift while the output of the engine is reduced due to a high temperature of intake air supplying to the engine or operations of the air conditioner.

Claims

1. A kick down shift control apparatus of an automatic transmission of a vehicle, the apparatus comprising:

vehicle running state sensing means for checking a running state of the vehicle;

engine control means for controlling engine outputs in response to a signal sensed by the vehicle running state sensing means and outputting information on the temperature of intake air and the operational state of an air conditioner;

shift control means for outputting a control signal to correct the pressure of transmission oil according to the temperature of intake air and the operational state of the air conditioner input from the engine control means, if conditions for a kick down shift are met with reception of the signal checked by the vehicle running state sensing means; and

driving means for controlling the oil pressure discharged out by the oil pump according to the control signal output from the shift control means and performing a shift by providing the oil pressure for a relevant friction factor.

2. The apparatus, as defined in claim 1, wherein the shift control means determines the first correction duty with the temperature of intake air on the basis of the preset Map Table and the second correction duty with the operational state of an air conditioner and operates the pressure control solenoid valve with the duty obtained by adding the first and second correction duties to a reference duty.

3. A method for controlling a kick down shift of an automatic transmission, the method comprising the steps of:

discriminating whether conditions for a kick down shift are satisfied while a vehicle is in motion;

discriminating whether the temperature of intake air is higher than a reference temperature if all the conditions are satisfied for the kick down shift; and

adjusting a transmission oil pressure if the temperature of intake air is higher than the reference temperature, and performing the kick down shift with the adjusted transmission oil pressure.

4. The method, as defined in claim 3, further comprising the steps of discriminating whether an air conditioner is in operation, adjusting the transmission oil pressure if the air conditioner is in operation, and performing the kick down shift with the adjusted shift oil pressure.

5. The method, as defined in claim 3 or 4, further comprising the step of determining the first correction duty with the temperature of intake air on the basis of the preset Map Table and the second correction duty with the operational state of an air conditioner and operating the pressure control solenoid valve with a duty obtained by adding the first and second correction duties to a reference duty.

6. The method, as defined in claim 5, wherein the second correction duty is set at 3% if the air conditioner is in operation.