EP0301558A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A slippage preventing apparatus for a vehicle with an automatic transmission
Assignee: Mazda Motor Corp
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Filing: 1988-07-29
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Granted: —
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Expires: 2008-07-29
Abstract
Abstract The output of the engine (6) is reduced by the slip control as a degree of slippage of the driven wheels (4,5) on pavement gets larger. Upon the slip control, the shift control of the automatic transmission (8) is brought into a state in which the speed stages are unlikely to be shifted.
Inventors
- 👤 Nagahisa Fujita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:14
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/175
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
197 words
In a vehicle adapted to allow an output of an engine to be transmitted to a driven wheel through an automatic transmission, a slippage preventing apparatus associated with the automatic transmission comprising: output adjusting means for adjusting the output of the engine; slip amount detecting means for detecting a slip amount or an amount of slippage of the driven wheel on pavement; accelerator amount detecting means for detecting an accelerator amount or an amount of operation of the accelerator; basic output adjusting means for adjusting said output adjusting means on the basis of the accelerator amount in response to an output from said accelerator amount detecting means; output controlling means for slip control adapted to reduce the output of the engine by controlling said output adjusting means prior to said basic output adjusting means in response to an output from said slip amount detecting means when a large degree of slippage occurs on the driven wheel; and shift controlling means adapted to control the shift of the automatic transmission so as to cause the shift unlikely to occur upon the slip control when the slip control is implemented by said output controlling means for the slip control.
Claim 2
Dependent Claim
197 words
In a vehicle adapted to allow an output of an engine to be transmitted to a driven wheel through an automatic transmission, a slippage preventing apparatus associated with the automatic transmission comprising: output adjusting means for adjusting the output of the engine; slip amount detecting means for detecting a slip amount or an amount of slippage of the driven wheel on pavement; accelerator amount detecting means for detecting an accelerator amount or an amount of operation of the accelerator; basic output adjusting means for adjusting said output adjusting means on the basis of the accelerator amount in response to an output from said accelerator amount detecting means; output controlling means for slip control adapted to reduce the output of the engine by controlling said output adjusting means prior to said basic output adjusting means in response to an output from said slip amount detecting means when a large degree of slippage occurs on the driven wheel; and shift controlling means adapted to control the shift of the automatic transmission so as to cause the shift unlikely to occur upon the slip control when the slip control is implemented by said output controlling means for the slip control.
Claim 3
Dependent Claim
73 words
A slippage preventing apparatus as claimed in claim 1, wherein said shift controlling means controls the shift of speed stages of the automatic transmission on the basis of a shift characteristic which sets the output of the engine and a vehicle speed as parameter when the vehicle is driven under ordinary driving conditions and controls the shift of speed stages by reducing the output of the engine during the slip control under way.
Claim 4
Dependent Claim
113 words
A slippage preventing apparatus as claimed in claim 2, wherein said shift controlling means incorporates: a first storing means for storing a first shift characteristic set using the engine output and the vehicle speed as parameters; a second storing means for storing a second shift characteristic set using the vehicle speed as a sole parameter; shift characteristic selecting means for selecting the first shift characteristic during ordinary drive operation and the second shift characteristic during operation of the slip control; and shift instructing means for instructing the shift of speed stages to the automatic transmission so as to provide a speed stage following the shift characteristic selected by said shift characteristic selecting means.
Claim 5
Dependent Claim
56 words
A slippage preventing apparatus as claimed in claim 3, wherein said shift controlling means further incorporates a holding mode selection means for selecting a holding mode, said holding mode selection means operable manually; and said shift characteristic selecting means selects the second shift characteristic when the holding mode is selected by said holding mode selection means.
Claim 6
Dependent Claim
29 words
A slippage preventing apparatus as claimed in claim 2, wherein said output adjusting means comprises a throttle valve adapted to adjust an amount of intake air into the engine.
Claim 7
Dependent Claim
75 words
A slippage preventing apparatus as claimed in claim 5, further comprising: braking force adjusting means for adjusting a braking force to be applied to the driven wheel; and slip control means for the brake adapted to apply the braking force to the driven wheel by controlling said braking force adjusting means in response to the output from said slip amount detecting means when a degree or amount of slippage on the driven wheel becomes large.
Claim 8
Dependent Claim
38 words
A slippage preventing appaatus as claimed in claim 2, wherein said slip amount detecting means detects a slip amount on the basis of a rotational speed of the driven wheel and a rotational speed of the undriven wheel.
Claim 9
Dependent Claim
49 words
A slippage preventing appaatus as claimed in claim 7, wherein said output controlling means for the slip control subjects said output adjusting means to a feedback control so as to allow a slip amount to be detected by said slip amount detecting means to reach a target slip amount.
Claim 10
Dependent Claim
117 words
A slippage preventing apparatus as claimed in claim 7, further comprising said output controlling means for the slip control incorporating: slip control amount determining means for determining a slip control corresponding to a predetermined target slip amount; judgement means adapted to provide an output when said slip control value reaches a value so as to decrease the output of the engine in comparison with a basic control value by comparing said slip control value with the basic control value by said basic output controlling means; and control value selecting means adapted to provide said slip control value with said output adjusting means prior to said basic control value in response to an output from the judgement means.
Claim 11
Dependent Claim
31 words
A slippage preventing apparatus as claimed in claim 2, where said shift controlling means is set so as to restrict the shift of speed stages during operation of the slip control.
Claim 12
Dependent Claim
34 words
A slippage preventing apparatus as claimed in claim 10, wherein the shift of speed stages is restricted during a period of time ranging from the start-up of the slip control to a predetermined time.
Claim 13
Dependent Claim
34 words
A slippage preventing apparatus as claimed in claim 10, wherein said shift controlling means controls the automatic transmission in such a manner that a speed stage thereof is fixed at a predetermined speed stage.
Claim 14
Dependent Claim
36 words
A slippage preventing apparatus as claimed in claim 12, wherein the speed stage to be fixed during operation of the slip control is a speed stage immediately before the start-up of operation of the slip control.
Claim 15
Dependent Claim
25 words
A slippage preventing apparatus as claimed in claim 10, wherein the speed stage to be fixed during operation of the slip control is manually selectable.
Claim 16
Dependent Claim
65 words
A slippage preventing apparatus as claimed in claim 2, wherein said shift controlling means is set to provide a speed stage for the slip control prior to the speed stage based on said shift characteristic during operation of the slip control; and said shift controlling means further incorporates a indicator means adapted to indicate that the speed stage is the one for the slip control.
Claim 17
Dependent Claim
43 words
A slippage preventing apparatus as claimed in claim 1, wherein said shift controlling means always controls speed stages of the automatic transmission in accordance with a shift characteristic set using an amount of operation of an accelerator and a vehicle speed as parameters.
Claim 18
Dependent Claim
28 words
A slippage preventing apparatus as claimed in claim 16, wherein said output adjusting comprises a throttle valve adapted to adjust an amount of intake air into the engine.
Claim 19
Dependent Claim
75 words
A slippage preventing apparatus as claimed in claim 17, further comprising braking force adjusting means for adjusting a braking force to be applied to the driven wheel; and slip control means for the brake adapted to apply the braking force to the driven wheel by controlling said braking force adjusting means in response to the output from said slip amount detecting means when a degree or amount of slippage on the driven wheel becomes large.
Claim 20
Dependent Claim
38 words
A slippage preventing apparatus as claimed in claim 16, wherein said slip amount detecting means detects a slip amount on the basis of a rotational speed of the driven wheel and a rotational speed of the undriven wheel.
Claim 21
Dependent Claim
47 words
A slippage preventing apparatus as claimed in claim 16, wherein said output controlling means for the slip control subjects said output adjusting means to a feedback control so as to allow a slip amount detecting by said slip amount detecting means to reach a target slip amount.
Claim 22
Dependent Claim
119 words
A slippage preventing apparatus as claimed in claim 19, wherein said output adjusting means for the slip control incorporates a slip control value determining means for determining a slip control value in accordance with a predetermined target slip amout; judgement means adapted to provide an output when said slip control value reaches a value so as to decrease the output of the engine in comparison with a basic control value by coparing said slip control value with the basic control value by said basic output controlling means; and control value selecting means adapted to provide said slip control value with said output adjusting means prior to said basic control value in response to an output from the judgement means.
Claim 23
Dependent Claim
21 words
A slippage preventing apparatus as claimed in claim 12, wherein said predetermined speed stage is set as a second speed stage.
References Cited (Backward Citations)
No citation records indexed.
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