EP0754888A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Axle torque estimating system
Assignee: Hitachi Ltd
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Filing: 1993-09-16
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Granted: —
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Expires: 2013-09-16
Abstract
Abstract An axle torque estimating system for a vehicle having an engine and an output shaft and a torque converter connected to the output shaft of the engine provides a shift signal which indicates a shift change ratio of the automatic transmission mechanism. An input torque of the automatic transmission mechanism is detected and the start timing for an actual mechanical gear shift of the automatic transmission mechanism is recognised. From the recognition of the actual mechanical shift start timing, an undergoing shift change ratio from the actual mechanical shift start timing is determined in accordance with a change of the shift signal. A torque calculation is effected when the actual mechanical shift start timing is recognised by multiplying the undergoing shift change ratio by the input torque and the axle torque out of shifting is calculated when a shift change has been completed by multiplying the shift change ratio at this time by the input torque.
Inventors
- 👤 Toshimichi Minowa
- 👤 Junichi Ishii
- 👤 Hiroshi Kimura
- 👤 Takashi Shiraishi
- 👤 Naoyuki Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 23:50
CPC Classifications
B; B60; B60K; B60K20/00; B60W; B60W10/00; B60W10/04; B60W10/06; B60K17/00; B60W10/10; B60W10/11; B60W10/115; B60W30/00; B60W30/18; B60W30/1819; B60W30/19; F; F16; F16H; F16H61/00; F16H61/04; F16H61/0437; F16H61/06; F16H61/061; F16H63/00; F16H63/40; F16H63/50; F16H63/502; B60W50/00; B60W2050/0001; B60W2050/0002; B60W2050/0008; B60W2050/0011; B60W2050/0019; B60W2050/0022; B60W2510/00; B60W2510/06; B60W2510/0638; B60W2510/0652; B60W2510/0657; B60W2510/0661; B60W2510/0695; B60W2510/10; B60W2510/1005; B60W2510/1015; B60W2510/102; B60W2510/1025; B60W2510/104; B60W2510/1045; B60W2510/105; B60W2520/00; B60W2520/10; B60W2540/00; B60W2540/10; B60W2710/00; B60W2710/06; B60W2710/0605; B60W2710/0616; B60W2710/0622; B60W2710/0666; B60W2710/10; B60W2710/105; F16H59/00; F16H59/02; F16H59/08; F16H2059/082; F16H59/14; F16H2059/147; F16H2059/148; F16H59/36; F16H2059/363; F16H2059/366; F16H59/38; F16H2059/385; F16H2059/405; F16H59/42; F16H2059/425; F16H59/46; F16H2059/465; F16H2059/467; F16H59/68; F16H2059/6807; F16H2061/0015; F16H2061/0075; F16H2061/0087; F16H2061/0096; F16H59/141; F16H59/16; F16H59/24; F16H59/48; F16H59/70; F16H61/0021; F16H61/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
251 words
An axle torque estimating system in a vehicle including an engine with an output shaft, a torque converter connected to said output shaft of the engine and having an output shaft, an automatic transmission mechanism connected to said output shaft of the torque converter and having an output shaft, and a driving axle connected to said output shaft of the automatic transmission mechanism, for estimating axle torque of the driving axle, comprising: shift signal output means for outputting a shift signal which indicates a shift change ratio of said automatic transmission mechanism; input torque detecting means for detecting an input torque of said automatic transmission mechanism; shift start recognition means for recognizing an actual mechanical shift start timing of said automatic transmission mechanism; undergoing shift change ratio setting means for setting an undergoing shift change ratio from said actual mechanical shift start timing of said automatic transmission mechanism in accordance with a change of said shift signal; and axle torque calculating means for calculating said axle torque under shifting, when said actual mechanical shift start timing is recognized by said shift start recognition means, by multiplying said undergoing shift change ratio, set by said undergoing shift change ratio setting means, by said input torque, detected by said input torque detecting means, and calculating said axle torque out of shifting, when a shift change has been completed, by multiplying said shift change ratio indicated by said shift signal at this time by said input torque detected by said input torque detecting means.
Claim 2
Dependent Claim
55 words
An axle torque estimating system according to Claim 1, wherein said undergoing shift change ratio setting means sets said undergoing shift change ratio which changes linearly, or by steps, from a shift change ratio indicated by said shift signal before said change to a shift change ratio indicated by the shift signal after said change.
Claim 3
Dependent Claim
62 words
An axle torque estimating system according to Claim 1, wherein said input torque detecting means comprising: engine r.p.m. determining means for determining an r.p.m. of said output shaft of said engine; and input torque calculating means for calculating said input torque in accordance with said r.p.m. detected by said engine r.p.m. detecting means by utilizing torque converter characteristics of said torque converter.
Claim 4
Dependent Claim
186 words
An axle torque controlling system for a vehicle including an engine with an output shaft, a torque converter connected to said output shaft of the engine and having an output shaft, an automatic transmission mechanism connected to said output shaft of the torque converter and having an output shaft, and a driving axle connected to said output shaft of the automatic transmission mechanism and axle torque manipulation means for changing an axle torque of the driving axle, for controlling the axle torque by outputting a manipulated variable to the axle torque manipulation means, comprising: an axle torque estimating system according to any preceding Claim; target axle torque setting means for setting a target torque of said driving axle in accordance with a condition of said vehicle; and manipulated variable calculation means for calculating a deviation between said axle torque calculated by said axle torque estimating system and said target axle torque set by said target axle torque setting means so as to calculate said manipulated variable which allows the deviation to be smaller in order to output the manipulated variable to said axle torque manipulation means.
Claim 5
Dependent Claim
61 words
An axle torque controlling system for a vehicle according to claim 4, wherein said target axle torque setting means determines said target axle torque under shifting in accordance with said axle torque of a period from when said shift signal outputted by said shift signal output means changes, until said shift start recognition means recognizes said actual mechanical shift start timing.
Claim 6
Dependent Claim
94 words
An axle torque controlling system for a vehicle according to claim 4 or 5, wherein said axle torque manipulation means is at least one member selected from a group consisting of line pressure control means for controlling an oil pressure of a hydraulic circuit in a case of said vehicle having the hydraulic circuit for actuating said automatic transmission mechanism, a throttle valve for regulating a flow rate of air flowing into said engine, a fuel injection valve for feeding said engine with fuel and ignition means for igniting said engine at appropriate timings.
Claim 7
Dependent Claim
58 words
An axle torque estimating system according to any of claims 1 - 3, wherein said axle torque calculating means calculates said axle torque out of shifting, when a shift change has been completed, by multiplying said shift change ratio indicated by said shift signal at this time by said input torque detected by said input torque detecting means.
References Cited (Backward Citations)
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