Powertrain control device for a vehicle using targeted tongue generation for eliminating shift shock
First Claim
1. A powertrain control device for a vehicle comprising:
- an automatic transmission having a torque converter;
a control device incorporating at least one microcomputer to control the engine and the automatic transmission;
a driving torque calculating means for estimating the output shaft torque of the automatic transmission;
a targeted torque generating means for generating a targeted torque based on the driving torque estimated by the driving torque calculating means;
an engine torque control value calculating means for calculating a control value for controlling the output torque of the engine from the deviation between the targeted torque generated by the targeted torque generating means and the driving torque estimated by the driving torque calculating means;
an engine torque control value limiting means provided in the engine torque control value calculating means, for limiting the engine torque control value below a specified value;
an engine torque control means for controlling the output torque of the engine in response to a signal from the engine torque control value calculating means;
an estimated driving torque monitoring means for monitoring the magnitude of the estimated driving torque calculated by the driving torque calculating means; and
a line pressure control device for controlling a line pressure of the automatic transmission by use of the estimated driving torque monitoring means.
1 Assignment
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Accused Products
Abstract
The object of this invention is to reduce shift shocks by controlling the driving torque during gear shift changing so that the driving torque is represented by a smooth, ideal waveform. The driving torque calculating means estimates the output shaft torque of the automatic transmission from the engine torque characteristic or torque converter characteristic and, based on the estimated driving torque, generate a targeted torque pattern during gear shift changing. The engine torque control value calculating means calculates the control value for controlling the engine output torque, i.e., an ignition timing correction value Δθig, so as to eliminate the deviation between the targeted torque and the driving torque estimated by the driving torque calculating means. This ignition timing correction approximates the driving torque to smooth the targeted torque.
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Citations
24 Claims
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1. A powertrain control device for a vehicle comprising:
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an automatic transmission having a torque converter; a control device incorporating at least one microcomputer to control the engine and the automatic transmission; a driving torque calculating means for estimating the output shaft torque of the automatic transmission; a targeted torque generating means for generating a targeted torque based on the driving torque estimated by the driving torque calculating means; an engine torque control value calculating means for calculating a control value for controlling the output torque of the engine from the deviation between the targeted torque generated by the targeted torque generating means and the driving torque estimated by the driving torque calculating means; an engine torque control value limiting means provided in the engine torque control value calculating means, for limiting the engine torque control value below a specified value; an engine torque control means for controlling the output torque of the engine in response to a signal from the engine torque control value calculating means; an estimated driving torque monitoring means for monitoring the magnitude of the estimated driving torque calculated by the driving torque calculating means; and a line pressure control device for controlling a line pressure of the automatic transmission by use of the estimated driving torque monitoring means. - View Dependent Claims (2, 3, 4)
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5. A powertrain control device for a vehicle comprising:
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an automatic transmission having a torque converter; a control device incorporating at least one microcomputer to control the engine and the automatic transmission; a driving torque calculating means for estimating the output shaft torque of the automatic transmission; a targeted torque generating means for generating a targeted torque based on the driving torque estimated by the driving torque calculating means; an engine torque control value calculating means for calculating a control value for controlling the output torque of the engine from the deviation between the target torque generated by the target torque generating means and the driving torque estimated by the driving torque calculating means; an engine torque control value limiting means provided in the engine torque control value calculating means, for limiting the engine torque control value above a specified value; an engine torque control means for controlling the output torque of the engine in response to a signal from the engine torque control value calculating means; a static line pressure determining means for determining line pressure of the automatic transmission during the normal traveling; an estimated driving torque monitoring means for monitoring the magnitude of the estimated driving torque calculated by the driving torque calculating means; a selecting means for selecting either the static line pressure determining means or the estimated driving torque monitoring means; and a line pressure control device for controlling the line pressure of the automatic transmission according to the output from the selecting means. - View Dependent Claims (6, 7)
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8. A powertrain control device for a vehicle comprising:
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an engine; an automatic transmission having a torque converter; a control device incorporating at least one microcomputer for controlling the engine and the automatic transmission; a driving torque calculating means for estimating the output shaft torque of the automatic transmission; a targeted torque generating means for generating a targeted torque during gear shift changing based on the driving torque estimated by the driving torque calculating means; an engine torque control value calculating means for calculating a control value used for controlling the output torque of the engine to eliminate the deviation between the targeted torque generated by the targeted torque generating means and the driving torque estimated by the driving torque calculating means; and an engine torque control means for controlling the output torque of the engine in response to a signal from the engine torque control value calculating means. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A powertrain control device for a vehicle having an engine, an automatic transmission, a torque converter, a transmission change signal generator for generating a transmission change signal at a transmission change timing, and a line pressure control device for controlling a line pressure of the automatic transmission, comprising:
at least one microcomputer to control the engine and the automatic transmission, wherein the powertrain control device has functions as follows; (a) calculating a present output shaft torque of the automatic transmission; (b) calculating a targeted torque based on the calculated present output shaft torque at a predetermined time after generating the transmission change signal; (c) calculating an engine control value for controlling the output torque of the engine such that a deviation between the targeted torque and the present output shaft torque is reduced; (d) calculating a line pressure control value for controlling the line pressure at the predetermined time based on the calculated present output shaft torque; and (e) outputting an engine control signal for controlling the engine based on the calculated engine control value and a line pressure control signal for controlling the line pressure based on the calculated line pressure control value. - View Dependent Claims (22, 23, 24)
Specification