Method of automatically controlling modulation pressure in an automatic transmission including addressing a stored engine data matrix with a combined address formed from both digitized engine speed and load
First Claim
1. A method of controlling a modulation pressure in an automatic transmission of a motor vehicle engine having means for converting engine load and engine speed into an engine load digital signal and an engine speed digital signal, a microprocessor connected to said means for converting so as to receive said engine load digital signal and said engine speed digital signal, reference data storage means having a plurality of storage locations, said reference data storage means containing stored predetermined engine speed and load dependent reference data in said storage locations and being connected with said microprocessor so as to be able to supply said microprocessor with said reference data from each of said storage locations and a modulation pressure regulating valve controllable by an electric current determined by said microprocessor, said method comprising the steps of combining said engine load digital signal and said engine speed digital signal in an address word for addressing one of said storage locations of said reference data storage means, addressing said storage location corresponding to said address word and transferring the contents of said storage location to said microprocessor so that said microprocessor contains said predetermined engine speed and load dependent data, and determining said current controlling said modulation pressure valve according to said predetermined engine speed and load dependent data in said microprocessor.
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Abstract
The method of controlling the modulation pressure in an automatic transmission of a motor vehicle engine includes determining which of n types of engines is being controlled, converting a digitized measured engine load value to one of eight scaled binary values, converting a digitized measured engine speed value signal to one of 32 scaled binary values, combining the scaled binary values of both engine speed and load into an address word for addressing one of n×256 storage locations of a data storage device containing reference control data, addressing the storage location corresponding to the address word and transferring the contents of the storage location so addressed to a microprocessor, which generates a current controlling a modulation pressure valve connected to the transmission according to the predetermined engine speed and load dependent data. For greater control sensitivity, reference data is retrieved from adjacent storage locations and an interpolation of the reference data in those locations is performed.
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Citations
14 Claims
- 1. A method of controlling a modulation pressure in an automatic transmission of a motor vehicle engine having means for converting engine load and engine speed into an engine load digital signal and an engine speed digital signal, a microprocessor connected to said means for converting so as to receive said engine load digital signal and said engine speed digital signal, reference data storage means having a plurality of storage locations, said reference data storage means containing stored predetermined engine speed and load dependent reference data in said storage locations and being connected with said microprocessor so as to be able to supply said microprocessor with said reference data from each of said storage locations and a modulation pressure regulating valve controllable by an electric current determined by said microprocessor, said method comprising the steps of combining said engine load digital signal and said engine speed digital signal in an address word for addressing one of said storage locations of said reference data storage means, addressing said storage location corresponding to said address word and transferring the contents of said storage location to said microprocessor so that said microprocessor contains said predetermined engine speed and load dependent data, and determining said current controlling said modulation pressure valve according to said predetermined engine speed and load dependent data in said microprocessor.
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13. A method of controlling a modulation pressure in an automatic transmission of a motor vehicle engine having means for converting engine load and engine speed into an engine load digital signal and an engine speed digital signal, a microprocessor connected to said means for converting so as to receive said engine load digital signal and said engine speed digital signal, reference data storage means having only 256 storage locations, said reference data storage means containing stored predetermined engine speed and load dependent reference data in said storage locations and being connected with said microprocessor so as to be able to supply said microprocessor with said reference data and a modulation pressure regulating valve controllable by an electric current determined by said microprocessor, said method comprising the steps of converting said engine load digital signal to one of eight scaled binary values, converting said engine speed digital signal to one of 32 binary values, combining said scaled binary values of said engine load digital signal and said engine speed digital signal into an address word for addressing one of said 256 storage locations of said reference data storage means, addressing said storage location corresponding to said address word and transferring the contents of said storage location to said microprocessor so that said microprocessor contains said predetermined engine speed and load dependent data stored at said storage location, and determining said current controlling said modulation pressure valve according to said predetermined engine speed and load dependent data in said microprocessor.
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14. A method of controlling a modulation pressure in an automatic transmission of a motor vehicle engine having means for converting engine load and engine speed into an engine load digital signal and an engine speed digital signal, a microprocessor connected to said means for converting so as to receive said engine load digital signal and said engine speed digital signal, reference data storage means having only n×
- 256 storage locations for n types of said motor vehicle engines, said reference data storage means containing stored predetermined engine speed and load dependent reference data for each of said engine types in said n×
256 storage locations and being connected with said microprocessor so as to be able to supply said microprocessor with said reference data and a modulation pressure regulating valve controllable by an electric current determined by said microprocessor, said method comprising the steps of determining which of said n types of said motor vehicle engines is being controlled, converting said engine load digital signal to one of eight scaled binary values, converting said engine speed digital signal to one of 32 scaled binary values, combining said scaled binary values of said engine load digital signal and said engine speed digital signal into an address word for addressing one of said 256 storage locations for said n type of said engine being controlled, addressing said storage location corresponding to said address word and transferring the contents of said storage location to said microprocessor so that said microprocessor contains said predetermined engine speed and load dependent data stored at said storage location, and determining said current controlling said modulation pressure valve according to said predetermined engine speed and load dependent data in said microprocessor.
- 256 storage locations for n types of said motor vehicle engines, said reference data storage means containing stored predetermined engine speed and load dependent reference data for each of said engine types in said n×
Specification