Driving aid indicator for economical operation of automatic transmission equipped motor vehicle
First Claim
1. Driving aid method for use with a motor vehicle having a torque converter and at least providing operator guidance for more efficient operation thereof, comprising the steps therefor:
- a. producing a first signal proportional to the torque converter input member rotational speed;
b. producing a second signal proportional to the torque converter output member rotational speed;
c. obtaining the effective difference between the first signal and the second signal to produce a slip signal;
d. coupling the instant value of the slip signal with address inputs of a vehicle performance profile memory to obtain an effective relative torque signal value weighted by values stored in the memory which relate to at least the torque converter coupling efficiency relative with absolute torque coupled therethrough; and
,e. producing tell tale guidance to an operator of said vehicle which relates instantaneous values of the relative torque signal with most efficient operation of said vehicle.
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Accused Products
Abstract
Driving aid apparatus for determining the best, most economical operating conditions for a motor vehicle equipped with an automatic transmission. The input member rotational rate of a torque converter coupled with the automatic transmission is measured. The rotational rate of the output member of the torque converter is also measured. A distinct difference may normally exist between these two rates, when a load is applied to the torque converter output, due to "slip" through the torque converter. The extent of this slip is in part proportional to the torque transmitted through the torque converter and, therefore, by a determination made from the difference between the two rates in combination with other key parameters affecting torque converter performance, the relative engine output torque can be found. Through utilizing this relative torque factor, in combination with other engine parameter signals such as manifold vacuum, operating temperature, and throttle position, the relative operating steadiness and net efficiency of the instant operating conditions of the overall vehicle is derived and displayed for the driver. This display enables the driver to operate the vehicle in a manner leading to uniform performance and maximum fuel economy. Through a control available for driver adjustment, the computed indicator responses are further modified to best suit the driving habits of the driver. A unique vehicle performance profile memory adds the dimension of tailoring the computed responses to the exact performance characteristics of the attendant vehicle.
79 Citations
24 Claims
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1. Driving aid method for use with a motor vehicle having a torque converter and at least providing operator guidance for more efficient operation thereof, comprising the steps therefor:
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a. producing a first signal proportional to the torque converter input member rotational speed; b. producing a second signal proportional to the torque converter output member rotational speed; c. obtaining the effective difference between the first signal and the second signal to produce a slip signal; d. coupling the instant value of the slip signal with address inputs of a vehicle performance profile memory to obtain an effective relative torque signal value weighted by values stored in the memory which relate to at least the torque converter coupling efficiency relative with absolute torque coupled therethrough; and
,e. producing tell tale guidance to an operator of said vehicle which relates instantaneous values of the relative torque signal with most efficient operation of said vehicle.
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2. Driving aid apparatus, adapted for use with a motor vehicle and comprising.
a. torque converter means; -
b. engine means coupled with an input member of said converter means; c. load means coupled with an output member of said converter means; d. first sensor means coupled with the input member of said torque converter means, effective to produce a first speed signal proportional to the rotational speed of said input member; e. second sensor means coupled with the output member of said torque converter means, effective to produce a second speed signal proportional to the rotational speed of said output member; f. combining means coupled with said first sensor means and said second sensor means effective to produce a slip signal proportional to the effective difference between the first speed signal and the second speed signal; g. memory means coupled with said slip signal effective to produce at an output therefrom a relative torque signal value effectively weighted by a value stored in the memory means; and
,h. telltale guidance means effectively coupled with said relative torque signal produced from said memory means output. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification